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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Margatoxin mitigates CCl4-induced hepatic fibrosis in mice via macrophage polarization, cytokine secretion and STAT signaling</title><author><name sortKey="Wu, Bao Ming" sort="Wu, Bao Ming" uniqKey="Wu B" first="Bao-Ming" last="Wu">Bao-Ming Wu</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation></author><author><name sortKey="Liu, Jun Da" sort="Liu, Jun Da" uniqKey="Liu J" first="Jun-Da" last="Liu">Jun-Da Liu</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af5-ijmm-45-01-0103">The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Yuan Hai" sort="Li, Yuan Hai" uniqKey="Li Y" first="Yuan-Hai" last="Li">Yuan-Hai Li</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af5-ijmm-45-01-0103">The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Jun" sort="Li, Jun" uniqKey="Li J" first="Jun" last="Li">Jun Li</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">31746414</idno><idno type="pmc">6889929</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6889929</idno><idno type="RBID">PMC:6889929</idno><idno type="doi">10.3892/ijmm.2019.4395</idno><date when="2019">2019</date><idno type="wicri:Area/Pmc/Corpus">000601</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000601</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Margatoxin mitigates CCl4-induced hepatic fibrosis in mice via macrophage polarization, cytokine secretion and STAT signaling</title><author><name sortKey="Wu, Bao Ming" sort="Wu, Bao Ming" uniqKey="Wu B" first="Bao-Ming" last="Wu">Bao-Ming Wu</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation></author><author><name sortKey="Liu, Jun Da" sort="Liu, Jun Da" uniqKey="Liu J" first="Jun-Da" last="Liu">Jun-Da Liu</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af5-ijmm-45-01-0103">The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Yuan Hai" sort="Li, Yuan Hai" uniqKey="Li Y" first="Yuan-Hai" last="Li">Yuan-Hai Li</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af5-ijmm-45-01-0103">The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Jun" sort="Li, Jun" uniqKey="Li J" first="Jun" last="Li">Jun Li</name><affiliation><nlm:aff id="af1-ijmm-45-01-0103">School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af2-ijmm-45-01-0103">The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</nlm:aff></affiliation><affiliation><nlm:aff id="af3-ijmm-45-01-0103">Institute for Liver Diseases of Anhui Medical University</nlm:aff></affiliation><affiliation><nlm:aff id="af4-ijmm-45-01-0103">Anhui Institute of Innovative Drugs, Anhui Medical University</nlm:aff></affiliation></author></analytic><series><title level="j">International Journal of Molecular Medicine</title><idno type="ISSN">1107-3756</idno><idno type="eISSN">1791-244X</idno><imprint><date when="2019">2019</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>A number of macrophage phenotypes have been previously identified as crucial regulators in the progression of hepatic fibrosis (HF). Cytokines from macrophages or Kupffer cells (KCs) have also been identified to be important regulators in HF. Blocking Kv1.3 in models of HF, regulating macrophage polarization and cytokine secretion have not yet been assessed as potential treatments options for this condition. In the current study, a model of carbon tetrachloride (CCl4)-induced HF was established and examined the effects of margatoxin (MgTX; an inhibitor of Kv1.3) on HF. Hematoxylin and eosin, Masson's trichrome and immunohistochemistry staining were performed to determine whether MgTX can alleviate liver fibrosis. To elucidate the mechanisms through which MgTX attenuates liver injury, reverse transcription-quantitative PCR and western blot analysis were used to detect polarized macrophage markers in RAW264.7 cells and cytokines were examined using ELISA. Furthermore, macrophage polarization signal transducer and activator of transcription (STAT) signaling, which is associated with macrophage polarization, was identified in RAW264.7 cells. The results revealed that MgTX protected the mice from CCl4-induced liver fibrosis. Furthermore, MgTX decreased the expression of M1 phenotype biomarkers, and increased the expression of M2 phenotype biomarkers in CCl4-induced HF. Additionally, the production of pro-inflammatory cytokines was decreased and interleukin-10 production was increased in the serum of mice with HF injected with MgTX. Furthermore, MgTX was found to regulate the expression of M1 markers by suppressing p-STAT1 activity and increasing the expression of M2 markers by promoting p-STAT6 activity. On the whole, the findings of this study demonstrate that MgTX is able to alleviate CCl4-induced HF in mice, possibly via macrophage polarization, cytokine secretion and STAT signaling.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Mederacke, I" uniqKey="Mederacke I">I Mederacke</name></author><author><name sortKey="Hsu, Cc" uniqKey="Hsu C">CC Hsu</name></author><author><name sortKey="Troeger, Js" uniqKey="Troeger J">JS Troeger</name></author><author><name sortKey="Huebener, P" uniqKey="Huebener P">P Huebener</name></author><author><name sortKey="Mu, X" uniqKey="Mu X">X Mu</name></author><author><name sortKey="Dapito, Dh" uniqKey="Dapito D">DH Dapito</name></author><author><name sortKey="Pradere, Jp" uniqKey="Pradere J">JP Pradere</name></author><author><name sortKey="Schwabe, Rf" uniqKey="Schwabe R">RF Schwabe</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Zheng, Z" uniqKey="Zheng Z">Z 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Int J Mol Med</journal-id><journal-id journal-id-type="iso-abbrev">Int. J. Mol. Med</journal-id><journal-id journal-id-type="publisher-id">IJMM</journal-id><journal-title-group><journal-title>International Journal of Molecular Medicine</journal-title></journal-title-group><issn pub-type="ppub">1107-3756</issn><issn pub-type="epub">1791-244X</issn><publisher><publisher-name>D.A. Spandidos</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">31746414</article-id><article-id pub-id-type="pmc">6889929</article-id><article-id pub-id-type="doi">10.3892/ijmm.2019.4395</article-id><article-id pub-id-type="publisher-id">ijmm-45-01-0103</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Margatoxin mitigates CCl4-induced hepatic fibrosis in mice via macrophage polarization, cytokine secretion and STAT signaling</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Wu</surname><given-names>Bao-Ming</given-names></name><xref ref-type="aff" rid="af1-ijmm-45-01-0103">1</xref><xref ref-type="aff" rid="af2-ijmm-45-01-0103">2</xref><xref ref-type="aff" rid="af3-ijmm-45-01-0103">3</xref><xref ref-type="aff" rid="af4-ijmm-45-01-0103">4</xref><xref rid="fn1-ijmm-45-01-0103" ref-type="author-notes">*</xref></contrib><contrib contrib-type="author"><name><surname>Liu</surname><given-names>Jun-Da</given-names></name><xref ref-type="aff" rid="af1-ijmm-45-01-0103">1</xref><xref ref-type="aff" rid="af2-ijmm-45-01-0103">2</xref><xref ref-type="aff" rid="af3-ijmm-45-01-0103">3</xref><xref ref-type="aff" rid="af4-ijmm-45-01-0103">4</xref><xref ref-type="aff" rid="af5-ijmm-45-01-0103">5</xref><xref rid="fn1-ijmm-45-01-0103" ref-type="author-notes">*</xref></contrib><contrib contrib-type="author"><name><surname>Li</surname><given-names>Yuan-Hai</given-names></name><xref ref-type="aff" rid="af1-ijmm-45-01-0103">1</xref><xref ref-type="aff" rid="af2-ijmm-45-01-0103">2</xref><xref ref-type="aff" rid="af3-ijmm-45-01-0103">3</xref><xref ref-type="aff" rid="af4-ijmm-45-01-0103">4</xref><xref ref-type="aff" rid="af5-ijmm-45-01-0103">5</xref><xref ref-type="corresp" rid="c2-ijmm-45-01-0103"></xref></contrib><contrib contrib-type="author"><name><surname>Li</surname><given-names>Jun</given-names></name><xref ref-type="aff" rid="af1-ijmm-45-01-0103">1</xref><xref ref-type="aff" rid="af2-ijmm-45-01-0103">2</xref><xref ref-type="aff" rid="af3-ijmm-45-01-0103">3</xref><xref ref-type="aff" rid="af4-ijmm-45-01-0103">4</xref><xref ref-type="corresp" rid="c1-ijmm-45-01-0103"></xref></contrib></contrib-group><aff id="af1-ijmm-45-01-0103"><label>1</label>School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University</aff><aff id="af2-ijmm-45-01-0103"><label>2</label>The Key Laboratory of Anti-Inflammatory and Immune Medicine, Anhui Medical University, Ministry of Education</aff><aff id="af3-ijmm-45-01-0103"><label>3</label>Institute for Liver Diseases of Anhui Medical University</aff><aff id="af4-ijmm-45-01-0103"><label>4</label>Anhui Institute of Innovative Drugs, Anhui Medical University</aff><aff id="af5-ijmm-45-01-0103"><label>5</label>The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China</aff><author-notes><corresp id="c1-ijmm-45-01-0103">Correspondence to: Professor Jun Li, School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, 81 Meishan Road, Hefei, Anhui 230032, P.R. China, E-mail: <email>lj@ahmu.edu.cn</email></corresp><corresp id="c2-ijmm-45-01-0103">Professor Yuan-Hai Li, The First Affiliated Hospital of Anhui Medical University, 218 Jixi Road, Hefei, Anhui 230032, P.R. China, E-mail: <email>liyuanhai-1@163.com</email></corresp><fn id="fn1-ijmm-45-01-0103" fn-type="equal"><label>*</label><p>Contributed equally</p></fn></author-notes><pub-date pub-type="ppub"><month>1</month><year>2020</year></pub-date><pub-date pub-type="epub"><day>04</day><month>11</month><year>2019</year></pub-date><pub-date pub-type="pmc-release"><day>04</day><month>11</month><year>2019</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>45</volume><issue>1</issue><fpage>103</fpage><lpage>114</lpage><history><date date-type="received"><day>02</day><month>5</month><year>2019</year></date><date date-type="accepted"><day>14</day><month>10</month><year>2019</year></date></history><permissions><copyright-statement>Copyright: © Wu et al.</copyright-statement><copyright-year>2020</copyright-year><license license-type="open-access"><license-p>This is an open access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-NonCommercial-NoDerivs License</ext-link>, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.</license-p></license></permissions><abstract><p>A number of macrophage phenotypes have been previously identified as crucial regulators in the progression of hepatic fibrosis (HF). Cytokines from macrophages or Kupffer cells (KCs) have also been identified to be important regulators in HF. Blocking Kv1.3 in models of HF, regulating macrophage polarization and cytokine secretion have not yet been assessed as potential treatments options for this condition. In the current study, a model of carbon tetrachloride (CCl4)-induced HF was established and examined the effects of margatoxin (MgTX; an inhibitor of Kv1.3) on HF. Hematoxylin and eosin, Masson's trichrome and immunohistochemistry staining were performed to determine whether MgTX can alleviate liver fibrosis. To elucidate the mechanisms through which MgTX attenuates liver injury, reverse transcription-quantitative PCR and western blot analysis were used to detect polarized macrophage markers in RAW264.7 cells and cytokines were examined using ELISA. Furthermore, macrophage polarization signal transducer and activator of transcription (STAT) signaling, which is associated with macrophage polarization, was identified in RAW264.7 cells. The results revealed that MgTX protected the mice from CCl4-induced liver fibrosis. Furthermore, MgTX decreased the expression of M1 phenotype biomarkers, and increased the expression of M2 phenotype biomarkers in CCl4-induced HF. Additionally, the production of pro-inflammatory cytokines was decreased and interleukin-10 production was increased in the serum of mice with HF injected with MgTX. Furthermore, MgTX was found to regulate the expression of M1 markers by suppressing p-STAT1 activity and increasing the expression of M2 markers by promoting p-STAT6 activity. On the whole, the findings of this study demonstrate that MgTX is able to alleviate CCl4-induced HF in mice, possibly via macrophage polarization, cytokine secretion and STAT signaling.</p></abstract><kwd-group><kwd>hepatic fibrosis</kwd><kwd>margatoxin</kwd><kwd>macrophages polarization</kwd><kwd>cytokines</kwd></kwd-group></article-meta></front><body><sec sec-type="intro"><title>Introduction</title><p>Fibrosis is a protective reaction that is activated in response to hepatic injury, causing a variety of diseases that result in hepatocellular death. Therefore, liver fibrosis is observed in patients with chronic viral hepatitis, non-alcoholic fatty liver disease, alcoholic liver disease, obesity, cholestatic and autoimmune liver diseases (<xref rid="b1-ijmm-45-01-0103" ref-type="bibr">1</xref>,<xref rid="b2-ijmm-45-01-0103" ref-type="bibr">2</xref>). Previous studies have indicated that the inflammatory response in the liver plays a crucial role in hepatic fibrogenesis during hepatic fibrosis (HF) (<xref rid="b3-ijmm-45-01-0103" ref-type="bibr">3</xref>). Hepatic macrophages, or Kupffer cells (KCs), are important immune cells that are associated with the pathogenesis of chronic liver injury, and have been recognized as potential targets for use in the treatment of fibrosis (<xref rid="b4-ijmm-45-01-0103" ref-type="bibr">4</xref>). Liver fibrosis has been widely demonstrated to be a reversible process. Hepatic macrophages can serve dual functions in the progression of experimental hepatic fibrosis, and can reverse mechanisms that are associated with the degradation of excessive extracellular matrix deposition in the liver (<xref rid="b5-ijmm-45-01-0103" ref-type="bibr">5</xref>). The investigation into novel compounds that can be used to regulate macrophage function is required for the identification of a therapeutic strategy for HF.</p><p>Carbon tetrachloride (CCl4)-induced HF is characterized by the activation of KCs and the relevant immune response, which results in the secretion of cytokines, chemokines and other pro-inflammatory factors (<xref rid="b6-ijmm-45-01-0103" ref-type="bibr">6</xref>). The mechanisms underlying the role of macrophages in HF have not been fully elucidated. Macrophages are classified into two phenotypes, those with M1 type pro-inflammatory function and those with M2 type-immunoregulatory function (<xref rid="b7-ijmm-45-01-0103" ref-type="bibr">7</xref>,<xref rid="b8-ijmm-45-01-0103" ref-type="bibr">8</xref>). Different phenotypes of macrophages have been identified to carry out different functions in the progression of HF. M1 macrophages are considered to induce pro-inflammatory cytokines and fibrogenesis, while M2 macrophages can be subdivided into at least 5 subtypes; however, their function in inflammation and fibrosis remains undetermined (<xref rid="b9-ijmm-45-01-0103" ref-type="bibr">9</xref>). Previous studies have demonstrated that a variety of M2 subtypes may exhibit pro- or anti-fibrotic activity (<xref rid="b10-ijmm-45-01-0103" ref-type="bibr">10</xref>-<xref rid="b13-ijmm-45-01-0103" ref-type="bibr">13</xref>). The mechanisms of macrophages as regards the regulation of liver fibrosis are associated with macrophage polarization. A variety of macrophage subtypes secrete a number of different cytokines, and this can result in a dual function response during the progression of HF.</p><p>The current study aimed to determine the effects of margatoxin (MgTX) on the polarization of macrophages in RAW264.7 cells, and to detect the serum levels of inflammatory cytokines following MgTX treatment in a model of HF. Hepatic macrophages in the liver, which are also known as KCs, when activated during an inflammatory condition, result in the release of a number of pro-inflammatory cytokines and chemokines, and an increase the activation of hepatic stellate cells (HSCs) (<xref rid="b14-ijmm-45-01-0103" ref-type="bibr">14</xref>). M1 macrophages are classical macrophages that exhibit antiviral activity and release pro-inflammatory cytokines, including tumor necrosis factor-α (TNF-α), interleukin (IL)-1β and reactive oxygen species, while M2 macrophages are activated macrophages that promote the defense against parasitic infections and are associated with tissue remodeling, and secrete immune-modulatory cytokines, including IL-10, transforming growth factor-β (TGF-β), IL-4 and IL-13 (<xref rid="b15-ijmm-45-01-0103" ref-type="bibr">15</xref>). Increasing evidence has indicated that a number of pro-inflammatory cytokines, including TNF-α and TGF-β, play a key role in the initiation of stellate cell activation. In other liver diseases, fibrosis has been indicated to be associated with the production of M2-associated cytokines and TGF-β (<xref rid="b15-ijmm-45-01-0103" ref-type="bibr">15</xref>). However, whether these cytokines originate from M2 macrophages during the modulation of extracellular matrix remodeling remains undetermined. Previous studies had revealed that M2 macrophage-derived cytokines, including IL-4, IL-13 and IL-10, regulate the chronic inflammatory response and ameliorate wound healing in the liver (<xref rid="b16-ijmm-45-01-0103" ref-type="bibr">16</xref>-<xref rid="b19-ijmm-45-01-0103" ref-type="bibr">19</xref>). On the whole, different macrophage subtypes secrete a number of different cytokines, which play key roles in the progression of HF.</p><p>Kv1.3 is a voltage-gated potassium channel subtype, which has 6 transmembrane domains, including a voltage sensor and a pore-forming region (<xref rid="b20-ijmm-45-01-0103" ref-type="bibr">20</xref>). MgTX is a 39 amino-acid-long peptide that is stabilized by 3 disulfide bridges, has a molecular weight of 4,185 and is isolated from the venom of the scorpion <italic>Centruroidesn margaritatus</italic>. MgTX exhibits a high affinity for Kv1.3 and is a selective inhibitor of the Kv1.3 channel. Kv1.3-selective blockers have been indicated to be effective in reducing disease severity in a number of animal models of autoimmunity (<xref rid="b21-ijmm-45-01-0103" ref-type="bibr">21</xref>-<xref rid="b24-ijmm-45-01-0103" ref-type="bibr">24</xref>). Previous studies have demonstrated that the selective Kv1.3-channel inhibition can significantly suppress the number of leukocytes, and the progression of renal fibrosis exhibits a significant decrease in cortical cell cycle marker expression. Active Kv1.3 channels can promote cardiac fibrosis by secreting TGF-β. The blockade of voltage-dependent potassium channels (Kv) by specific antagonists decreases macrophage cytokine production and inhibits proliferation (<xref rid="b25-ijmm-45-01-0103" ref-type="bibr">25</xref>-<xref rid="b27-ijmm-45-01-0103" ref-type="bibr">27</xref>). However, whether MgTX is associated with HF has not, to the best of our knowledge, yet been determined. The current study aimed to assess whether MgTX can ameliorate HF <italic>in vivo</italic>, and to explore the underlying mechanisms that govern the association between Kv1.3 and macrophages polarization and cytokine secretion.</p></sec><sec sec-type="materials|methods"><title>Materials and methods</title><sec><title>Mouse model of HF</title><p>All animal protocols were approved by the Animal Care and Use Committee of Anhui Medical University, China. Male C57BL/6 mice (age, 4-6 weeks) were obtained from the Experimental Animal Center of Anhui Medical University for use in creating the model of CCl4-induced liver fibrosis. Early HF was generated by a bi-weekly intraperitoneal injection of CCl4 (20% in olive oil) at a dose of 0.01 ml/g/mouse for 4 weeks. The control mice were treated intraperitoneally with the same volume of olive oil at the same time intervals. MgTX was diluted in PBS and injected at 1 ml by intraperitoneal injection at 3 different doses 1 h prior to the CCl4 (olive oil) injection, namely the doses of MgTX used were 0.4179 mg/kg (high, H), 0.139 mg/kg (moderate, M), 0.0418 mg/kg (low, L).</p></sec><sec><title>Collection of mouse blood and tissues</title><p>Blood samples were collected from orbital sinus by rapidly removing the eyeball after the mice were anesthetized with chloral hydrate (4%, 400 mg/kg) by intraperitoneal injection. Approximately 1 ml blood was collected in an EP tube for each mouse. Following blood sample collection, the mice were sacrificed by cervical dislocation. Liver tissues were obtained by a midline laparotomy. Liver tissues were either fixed in 4% formalin for immunohistochemistry, or stored at -80°C for use in western blot analysis. All animal studies were conducted following the approval from the Institutional Animal Care and Use Committee.</p></sec><sec><title>Histopathology and immunohistochemical staining</title><p>The central left hepatic lobe was sectioned and fixed in 4% paraformaldehyde for 48 h. Tissues were then embedded in paraffin, and 5-<italic>µ</italic>m-thick slices were stained using hematoxylin (BA-4041, Baso) and eosin (BA-4022, Baso) for morphological analysis, stained with hematoxylin for 20 min and eosin for 1 min at room temperature. Masson's trichrome and Sirius red staining were used for the evaluation of collagen expression. Masson's trichrome kit (MST-8003/8004, Maixin-Bio) and Sirius red staining kit (36324ES60, Yeasen Biotechnology (Shanghai) Co., Ltd.) were carried out according to the manufacturer's instructions at room temperature. Immunostaining was performed on paraffin-embedded materials. The following primary antibodies were used: Matrix metalloproteinase (MMP)12 rabbit polyclonal (diluted 1:100; 22989-1-AP, Proteintech), MMP13 rabbit polyclonal (diluted 1:200; bs-10581R, Bioss), periostin (POSTN) rabbit polyclonal (diluted 1:200; bs-4994R, Bioss), C-C motif chemokine ligand 2 (CCL2) rabbit polyclonal (diluted 1:100; bs-1101R, Bioss), Kv1.3 rabbit polyclonal (diluted 1:100; bs-10229R, Bioss), δ-catenin rabbit polyclonal (diluted 1:200; bs-7000R, Bioss), α-SMA rabbit polyclonal (diluted 1:200; ab5694, Abcam), collagen I rabbit polyclonal (diluted 1:150; bs-10423R, Bioss) were used; the primary antibody reactions were incubated for 30 min at room temperature. A secondary antibody kit (PV-6000, Zsbio) was used for immunohistochemical staining. The average optical density for the semi-quantitative analysis of immunohistochemical staining was performed by CaseViewer (pananoramic MIDI, 3DHISTECH) and JD801.</p></sec><sec><title>ELISA</title><p>Serum was extracted from blood by centrifugation (-1,000 × g, 10 min) at 4°C and stored at -80°C for subsequent use. The levels of IL-1β, IL-6, IL-10, IL-20, TNF-α and TGF-β were determined using mouse serum using ELISA kits according to the manufacturer's protocol. A mouse IL-1β ELISA kit (cat. no. RK00006), mouse IL-6 ELISA kit (cat. no. RK00008), mouse IL-10 ELISA kit (cat. no. RK00016), mouse IL-20 ELISA kit (cat. no. RK00110), mouse TNF-α ELISA kit (cat. no. RK00027) and a mouse TGF-β1 ELISA kit (cat. no. RK00057) were used and were all purchased from ABclonal, Inc.</p></sec><sec><title>Cells and cell culture</title><p>RAW264.7 cells were purchased from the Type Culture Collection of the Chinese Academy of Sciences. The cells were cultured in DMEM (Gibco; Thermo Fisher Scientific, Inc.) supplemented with FBS (10%; Gibco; Thermo Fisher Scientific, Inc.), penicillin and streptomycin (1%), and cultured at 37°C in a 5% CO<sub>2</sub> incubator. The RAW264.7 cells were treated with lipopolysaccharide LPS (1 <italic>µ</italic>g/ml) combined with interferon (IFN)-γ (10 ng/ml) for 24 h to polarize the M1 macrophage phenotype, or were treated with IL-4 (15 ng/ml) for 24 h to induce the M2 macrophage phenotype. The RAW264.7 cells were also treated with MgTX (10 nM) for 24 h at 37°C, as previously described (<xref rid="b27-ijmm-45-01-0103" ref-type="bibr">27</xref>).</p></sec><sec><title>Total RNA extraction and reverse transcription-quantitative PCR (RT-qPCR)</title><p>Total RNA was extracted from the RAW264.7 cell lines using TRIzol<sup>®</sup> reagent (Invitrogen; Thermo Fisher Scientific, Inc.). A ThermoScript RT-qPCR synthesis kit (Fermentas; Thermo Fisher Scientific, Inc.) was used to synthesize the cDNA according to the manufacturer's protocol. RT-qPCR-was performed using ThermoScript RT-qPCR kits (Fermentas; Thermo Fisher Scientific, Inc.). β-actin was used for normalization. Relative RNA expression was calculated using the standard 2<sup>−ΔΔCq</sup> method (<xref rid="b28-ijmm-45-01-0103" ref-type="bibr">28</xref>). Each experiment was performed in triplicate and repeated at least 3 times. The sequences of the primers (5′-3′) are presented in <xref rid="tI-ijmm-45-01-0103" ref-type="table">Table I</xref>.</p></sec><sec><title>Western blot analysis</title><p>The RAW264.7 cells were lysed using protein extraction solution (Beyotime Institute of Biotechnology). The protein concentration of each sample was measured using a NanoDrop 2000 Spectrophotometer (Thermo Fisher Scientific, Inc.). Samples (20 <italic>µ</italic>g/lane) underwent SDS-PAGE (10%) and were transferred onto PVDF membranes (EMD Millipore). The PVDF membranes were blocked with 5% non-fat milk for 2 h, and subsequently incubated with primary antibodies at 4°C overnight. Primary antibodies against δ-catenin (1:300, cat. no. bs-7000R, Bioss), α-SMA (1:300, cat. no. bs-0189R, Bioss), collagen I (1:300, cat. no. bs-10423R, Bioss), MMP12 (1:600, cat. no. 22989-1-AP, Proteintech), MMP13 (1:300, cat. no. bs-10581R, Bioss), POSTN (1:300, cat. no. bs-4994R, Bioss), CCL2 (1:500, cat. no. bs1101R, Bioss), Kv1.3 (1:300, cat. no. bs-10229R, Bioss), iNOS (1:1,000, cat. no. ab4999, Abcam), TNF-α (1:500, cat. no. BS1857, Bioworld), IL-β (1:300, cat. no. bs0812R, Bioss), IL-10 (1:1,000, cat. no. bs0698R, Bioss), CD163 (1:300, cat. no. bs2527R, Bioss), Arg-1 (1:200, cat. no. sc-47715, Santa Cruz Biotechnology), Mrc2 (1:500, cat. no. ab70132, Abcam) and β-actin (1:500, cat. no. TA-09, Zs-BIO) were used. Subsequently, the PVDF membranes were washed 3 times with TBST, followed by incubation with secondary antibodies [HRP-goat anti-rabbit IgG (1:1,000; cat. no. ZB-2305; Zs-BIO)] at room temperature for 1.5 h. After washing 3 times with TBST, the protein blots were observed using an ECL-chemiluminescent kit (ECL-plus; Thermo Fisher Scientific, Inc.),and the gray values of the bands were measured using ImageJ software (version 1.4.3.67).</p></sec><sec><title>Statistical analysis</title><p>Statistical analysis was performed using the Statistical Package for Social Sciences v.13.0 (SPSS, Inc.). Data are summarized from at least 3 experiments and are presented as the means ± standard deviation. The statistical evaluation of the results was performed using a one-way ANOVA. Multiple comparisons between the groups were performed using the SNK method. A value of P<0.05 was considered to indicate a statistically significant difference.</p></sec></sec><sec sec-type="results"><title>Results</title><sec><title>Kv1.3 inhibition alleviates CCl4-induced liver fibrosis in mice</title><p>To investigate the degree of HF in C57BL/6J mice with CCl4-induced HF, histopathological analysis was performed. Hematoxylin and eosin staining, Masson's staining and Sirius Red staining demonstrated that the CCl4 (20%) injection caused significant liver fibrosis, including serious steatosis, inflammatory cell infiltration and fibrosis in the main block of mouse livers compared with the control group. In comparison, no evidence of liver injury was observed in the control group with/without MgTX (0.4179 mg/kg). MgTX was therefore indicated to attenuate liver fibrosis in mice with CCl4-induced HF (<xref rid="f1-ijmm-45-01-0103" ref-type="fig">Fig. 1A</xref>). Immunohistochemistry from the liver fibrosis tissues revealed extensive α-SMA- and collagen I-positive staining, whereas the liver tissues in the control group with/without MgTX indicated decreased staining. Additionally, the results of western blot analysis for α-SMA and collagen I protein expression were consistent with the results from immunohistochemistry (<xref rid="f1-ijmm-45-01-0103" ref-type="fig">Fig. 1B and C</xref>). These results indicated that the mouse model of CCL4-induced liver fibrosis was successfully established and that MgTX protected the mice from CCl4-induced HF.</p></sec><sec><title>MgTX decreases the expression of HF-associated proteins in mice</title><p>To investigate the expression levels of proteins that are associated with HF in mice following the MgTX injection, immunohistochemistry and western blot analysis were performed to determine the expression of MMP12, MMP13, POSTN, δ-catenin, Kv1.3 and CCL2. Immunohistochemical analysis of the liver tissues revealed that all proteins in the MgTX-treated mice with HF were decreased compared with the tissues from the mice with CCl4-induced HF not treated with MgTX (<xref rid="f2-ijmm-45-01-0103" ref-type="fig">Fig. 2</xref>).</p></sec><sec><title>MgTX decreases the expression of HF-associated proteins in RAW264.7 cells</title><p>The results of immunohistochemistry demonstrated that the aforementioned proteins were expressed in the liver tissue. Therefore, the current study aimed to determine protein expression in macrophages. The proteins associated with HF were determined in RAW264.7 cells treated with MgTX (10 nM; Control; M1, M1 + MgTX and M2, MgTX and M2 + MgTX), to examine whether macrophages are associated proteins that have been indicated to play a role in HF. This analysis was also performed to determine whether macrophages play a critical role in regulating the expression of proteins associated with HF. The levels of MMP12, MMP13, POSTN, CCL2, Kv1.3 and δ-catenin were determined by western blot analysis. The results indicated that the levels of proteins associated with HF in the M1 phenotype macrophages treated with MgTX decreased compared with the other M1 phenotype groups. However, the levels of proteins associated with HF in the M2 phenotype macrophages treated with MgTX were downregulated or upregulated compared with the other M2 phenotype groups (<xref rid="f3-ijmm-45-01-0103" ref-type="fig">Fig. 3</xref>).</p></sec><sec><title>MgTX regulates the secretion of cytokines in vivo</title><p>To explore the functional role of Kv1.3 in the regulation of cytokine secretion in CCl4-induced HF, ELISAs were performed to evaluate the circulation levels of inflammatory cytokines in the serum of mice with CCl4-induced HF. The results revealed that the serum levels of pro-inflammatory cytokines, including IL-1β, IL-6, IL-20 and TNF-α were significantly decreased with MgTX treatment (0.4179 mg/kg), while the levels of anti-inflammatory cytokines, including IL-10, were increased in the mice with CCl4-induced HF treated with MgTX (0.4179 mg/kg). However, TGF-β expression was not significantly decreased in the CCL4 + MgTX treatment group compared with the model groups (<xref rid="f4-ijmm-45-01-0103" ref-type="fig">Fig. 4</xref>).</p></sec><sec><title>MgTX regulates macrophage polarization in vitro</title><p>To examine whether MgTX can regulate macrophage polarization, M1 macrophages were induced using LPS (1 <italic>µ</italic>g/ml) and IFN-γ (10 ng/ml) for 24 h, and M2 macrophages were induced using IL-4 (15 ng/ml) for 24 h. RT-qPCR indicated that treatment of M1 macrophages with MgTX (10 nM) decreased the mRNA expression of M1-related markers (iNOS, CCL2, TNF-α and IL-1β), while the mRNA expression levels of M2-related markers (IL-10, CD163, Arg-1 and Mrc2) were upregulated by MgTX in M2 macrophages (<xref rid="f5-ijmm-45-01-0103" ref-type="fig">Fig. 5A-H</xref>). The primer sequences are presented in <xref rid="tI-ijmm-45-01-0103" ref-type="table">Table I</xref> (5′-3′). The results of western blot analysis were consistent with the results of RT-qPCR (<xref rid="f5-ijmm-45-01-0103" ref-type="fig">Fig. 5I-Q</xref>). The results revealed that Kv1.3 contributed to the regulation of macrophage polarization.</p></sec><sec><title>Kv1.3 regulates macrophage polarization through the STAT1/STAT6 pathway</title><p>The underlying mechanisms through which MgTX contributes to macrophage polarization was subsequently investigated. Previous reports have indicated that the activation of STAT1 signaling pathways, by IFNs and/or TLR signaling, can switch macrophage toward the M1 phenotype, additionally, the activation of STAT6 by IL-4 and/or IL-13 has been demonstrated to switch macrophage function toward the M2 phenotype (<xref rid="b29-ijmm-45-01-0103" ref-type="bibr">29</xref>). In this study, the results of western blot analysis revealed that the phosphorylation of STAT1 was significantly increased in M1 macrophages, and was downregulated following MgTX (10 nM) treatment. Additionally, the phosphorylation of STAT6 was significantly increased in M2 macrophages, and was upregulated by MgTX treatment (<xref rid="f6-ijmm-45-01-0103" ref-type="fig">Fig. 6</xref>). These results indicated that MgTX may regulate macrophage polarization through the STAT1/STAT6 signaling pathway.</p></sec></sec><sec sec-type="discussion"><title>Discussion</title><p>Fibrogenesis is a biochemical process that represents damage in the majority of chronic diseases of the liver. The activation of HSCs is an important pathophysiological mechanism in the initiation, progression and regression of liver fibrosis. A number of studies have identified crosstalk, which is at the level of hepatic microcirculation, between the HSCs, sinusoidal endothelial cells and KCs (<xref rid="b30-ijmm-45-01-0103" ref-type="bibr">30</xref>). Studies on animal models and human studies have indicated that HF is a reversible disease. The regression of HF can be possible in the early stages of the condition, and partial and prolonged recovery occurs in the late or advanced stages. The success of HF treatment can increase survival and decrease the occurrence of liver cirrhosis and hepatocellular carcinoma (<xref rid="b31-ijmm-45-01-0103" ref-type="bibr">31</xref>-<xref rid="b36-ijmm-45-01-0103" ref-type="bibr">36</xref>). Macrophages play a crucial role in the occurrence and resolution of liver fibrosis. It has been well established that infiltrating macrophages derived from monocytes and KCs play a key role in the initiation and resolution of HF, and, in mouse models of chronic liver injury, it has been demonstrated that hepatic macrophages can promote the activation and survival of HSCs (<xref rid="b37-ijmm-45-01-0103" ref-type="bibr">37</xref>,<xref rid="b38-ijmm-45-01-0103" ref-type="bibr">38</xref>). Furthermore, a subtype of restorative macrophages has been indicated to promote the resolution of fibrosis in chronic liver injury (<xref rid="b5-ijmm-45-01-0103" ref-type="bibr">5</xref>,<xref rid="b39-ijmm-45-01-0103" ref-type="bibr">39</xref>). The current study demonstrated that MgTX can protect liver cells from CCl4-induced HF injury. The present study also explored whether MgTX attenuates liver fibrosis through the regulation of cytokine secretion and the polarization of macrophages.</p><p>The results of the current study indicated that MgTX decreased the expression of HF associated proteins in mice. Proteins of the MMP family are associated with the breakdown of the extracellular matrix (ECM) during physiological processes. MMP12 and MMP13 are important proteins that are associated with the ECM. Macrophages exhibit numerous functions in fibrogenesis, and specific subtypes promote fibrosis resolution through enhanced ECM degradation and by increasing MMP12 and MMP13 expression (<xref rid="b40-ijmm-45-01-0103" ref-type="bibr">40</xref>,<xref rid="b41-ijmm-45-01-0103" ref-type="bibr">41</xref>). In the current study, the expression levels of MMP12 and MMP13 were increased in the HF model, and this was due to an excess of ECM that requires degradation. The results of the current study demonstrated that MMP12 and MMP13 expression decreased in CCl4-exposed mice treated with MgTX. POSTN is a 90-kDa secretory matricellular protein that can regulate a number of effects during inflammation, wound healing and tissue injury, and regulates key molecules of the fibrotic matrix, including fibronectin and type I collagen via its EMILIN domain, to promote fibrosis degradation (<xref rid="b42-ijmm-45-01-0103" ref-type="bibr">42</xref>,<xref rid="b43-ijmm-45-01-0103" ref-type="bibr">43</xref>). The results of the present study indicated that POSTN was significantly downregulated by MgTX in the HF model compared with the model group. MMP12, MM13 and POSTN are associated with the progression of ECM and collagen. The results revealed that MgTX decreased the expression of MMP12, MMP13 and POSTN, in the CCl4-exposed group, attenuating HF. Exposure to CCl4 led to the elevation of liver enzymes, such as ALT and AST; however, there was no significant change in the liver fibrosis model with MgTX treatment. Additionally, a number of studies have indicated that the M1 phenotype cells play an important role in promoting HF (<xref rid="b29-ijmm-45-01-0103" ref-type="bibr">29</xref>,<xref rid="b44-ijmm-45-01-0103" ref-type="bibr">44</xref>). In this study, in RAW264.7 cell lines, the expression of proteins associated with HF were decreased in M1 phenotype macrophages treated with MgTX, which exerts an anti-fibrotic effect in the progressive stage.</p><p>A therapeutic strategy for the treatment of HF is to inhibit inflammatory monocyte infiltration. Kv1.3 plays a critical role in monocyte migration, and the inhibition of Kv1.3 can inhibit monocyte chemotaxis and monocyte infiltration into injury brain (<xref rid="b45-ijmm-45-01-0103" ref-type="bibr">45</xref>). In the current study, Kv1.3 was demonstrated to be associated with macrophage migration in acute liver injury; Kv1.3 was indicated to downregulate the expression of δ-catenin to inhibit macrophage migration. According to another study by our group (unpublished data), RNA-seq profiling analysis revealed that MgTX treatment downregulated δ-catenin. According to wound healing and Transwell assays, δ-catenin overexpression in RAW264.7 cells promoted migration, which was suppressed upon silencing of δ-catenin. Another study revealed that monocyte recruitment following light-induced cell death was associated with the spatial-temporal expression of CCL2, and the suppression of CCL2 in Müller cells decreased the recruitment of monocytes/microglia (<xref rid="b46-ijmm-45-01-0103" ref-type="bibr">46</xref>). Additionally, previous studies have revealed that macrophages may promote HSC migration via CCL2 secretion, which can regulate the crosstalk between cholangiocytes and portal fibroblasts (<xref rid="b47-ijmm-45-01-0103" ref-type="bibr">47</xref>,<xref rid="b48-ijmm-45-01-0103" ref-type="bibr">48</xref>). The inhibition of macrophage migration infilter into the liver can reduce the immunological reaction; thus, in this study a decrease in the expression of Kv1.3, δ-catenin and CCL2 in the mice with CCl4-induced injury treated with MgTX was observed. On the whole, the current study indicated that MgTX inhibited macrophage migration to attenuate HF in mice.</p><p>HF typically results from an inflammatory process that affects hepatocytes or biliary cells. Inflammation leads to the activation of effector cells, which results in the deposition of ECM. Cytokines are released from inflammatory cells and play an important role in HF as a key effector. The TGF-β cascade plays a major role in fibrogenesis due to TGF-β being a potent stimulator of the synthesis of extracellular matrix proteins (<xref rid="b49-ijmm-45-01-0103" ref-type="bibr">49</xref>). Pro-inflammatory cytokines, including IL-6, IL-1β and TNF-α, are released from innate immune cells and promote fibrogenesis via active HSCs. A recent study demonstrated that the treatment of mice with recombinant IL-20 increased the expression of the pro-fibrotic cytokines, TGF-β and TNF-α, and enhanced collagen synthesis in the liver; treatment with neutralizing antibodies against IL-20 or IL20RA was revealed to ameliorate the CCl4-induced HF in mice (<xref rid="b50-ijmm-45-01-0103" ref-type="bibr">50</xref>). Cytokines of the IL-10 family exert protective effects, and IL-10 has been identified to exhibit a suppressive effect, which inhibits the innate and adaptive immune responses and prevents increased exacerbations. Therefore, IL-10 plays a protective role in the prevention of tissue injury in chronic fibroproliferative diseases. Additionally, this has been demonstrated in wound healing assays of scar formation in IL-10 knockout mice (<xref rid="b51-ijmm-45-01-0103" ref-type="bibr">51</xref>). The results of the current study demonstrated that MgTX decreased the serum levels of IL-6, IL-1β, IL-20 and TNF-α, increased the IL-10 serum levels, but did not affect the TGF-β levels significantly. These results indicated that MgTX regulated cytokine secretion in macrophages; however, this effect was decreased in HSCs. Thus, HF can be attenuated by MgTX through the regulation of the serum levels of a number of cytokines.</p><p>A variety of macrophage subtypes release a number of cytokines and exhibit functions in the pathophysiological process. The M1 and M2 phenotype polarization of macrophages may directly influence the outcome in chronic hepatic injury (<xref rid="b52-ijmm-45-01-0103" ref-type="bibr">52</xref>). In this study, RT-qPCR and western blot analysis indicated that the levels of M1-related markers were downregulated by MgTX, and that the levels of M2-related markers were upregulated by MgTX. A number of studies have indicated that STATs are crucial factors in M1 and M2 macrophage polarization (<xref rid="b53-ijmm-45-01-0103" ref-type="bibr">53</xref>,<xref rid="b54-ijmm-45-01-0103" ref-type="bibr">54</xref>). p-STAT1 is required to promote M1 type macrophage activation in the presence of IFN-γ from innate lymphocytes (<xref rid="b55-ijmm-45-01-0103" ref-type="bibr">55</xref>). By contrast, p-STAT6 is an important regulator of M2 type macrophage polarization in the presence of IL-13 or IL-4 during the TH2 cell-mediated immune responses (<xref rid="b56-ijmm-45-01-0103" ref-type="bibr">56</xref>,<xref rid="b57-ijmm-45-01-0103" ref-type="bibr">57</xref>). Therefore, the current study examined the effects of MgTX on STAT signaling during macrophage polarization. The phosphorylation and protein expression of p-STAT1 was markedly decreased in M1 macrophages treated with MgTX, and the phosphorylation levels of p-STAT6 were increased in M2 macrophages treated with MgTX. Therefore, MgTX was indicated to regulate macrophage polarization via the STAT signaling pathway. Furthermore, the phenotype of macrophages can be switched by MgTX; thus, it would be of interest to examine the migratory ability of macrophages in future studies.</p><p>HF, which is caused by a number of etiologies, is a common pathological characteristic of end-stage hepatic diseases. Advanced fibrosis can lead to cirrhosis, and currently, there is no effective anti-fibrotic treatment that has been approved for human use, at least to the best of our knowledge. Thus, the identification of novel therapeutic options with which to prevent the progression of liver fibrosis is urgently required. The current study demonstrated that MgTX can ameliorate HF by regulating macrophage polarization and cytokine secretion. These results provide novel information on treatment options for the prevention and reversion of liver fibrosis. However, further studies are required to examine whether MgTX may be an effective candidate for the treatment of advanced-stage fibrosis or cirrhosis and whether MgTX may be a novel candidate for the treatment of HF or other immunological diseases.</p></sec></body><back><ack><title>Acknowledgments</title><p>Not applicable.</p></ack><sec sec-type="other"><title>Funding</title><p>The current study was supported by a grant from the National Natural Science Foundation of China (grant no. 81500473).</p></sec><sec sec-type="materials"><title>Availability of data and materials</title><p>All data generated or analyzed during this study are included in this published article or are available from the corresponding author on reasonable request.</p></sec><sec sec-type="other"><title>Authors' contributions</title><p>JL and YHL conceived and designed the experiments. BMW and JDL performed the experiments. BMW analyzed the data and wrote the paper. 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(A) Representative hematoxylin and eosin staining, Masson's staining and Sirius Red staining of liver tissues indicated an incomplete hepatic lobule structure and irregularly arranged hepatic plates. Scattered degeneration, necrosis and numerous inflammatory cells immersed in liver tissue were identified compared with the HF model group treated with MgTX (magnification, ×200; black arrows, fibrosis; green arrows, steatosis; red arrows, inflammatory cell infiltration). (B) Immunohistochemistry and (C) western blot analysis of hepatic fibrosis tissues revealed increased α-SMA and collagen I expression compared with the CCl4-exposed group treated with MgTX. <sup>*</sup>P<0.05, <sup>***</sup>P<0.001 vs. CCl4; <sup>#</sup>P<0.05, <sup>###</sup>P<0.001 vs. negative control. Representative views from each group are presented (original magnification, ×20; n=6). MgTX, margatoxin; CCl4, carbon tetrachloride; HF, hepatic fibrosis.</p></caption><graphic xlink:href="IJMM-45-01-0103-g00"></graphic><graphic xlink:href="IJMM-45-01-0103-g01"></graphic><graphic xlink:href="IJMM-45-01-0103-g02"></graphic></fig><fig id="f2-ijmm-45-01-0103" orientation="portrait" position="float"><label>Figure 2</label><caption><p>MgTX (0.4179 mg/kg) decreases the expression of HF-associated proteins in C57BL/6J mice with CCl4-induced HF (×200 field). (A) MMP12, MM13 and POSTN were associated with the amount of ECM and collagen. Immunohistochemistry of liver fibrosis tissues revealed MMP12, MM13 and POSTN exhibited increased staining compared with the HF group treated with MgTX. <sup>*</sup>P<0.05, CCl4 vs. CCl4 + MgTX group; <sup>#</sup>P<0.05, CCl4 vs. N group. (B) CCL2, Kv1.3 and δ-catenin are associated with the migration of macrophages. Immunohistochemistry of liver fibrosis tissues revealed increased staining for CCL2 and Kv1.3 compared with the HF group treated with MgTX. <sup>*</sup>P<0.05, CCL4 vs. CCL4 + MgTX group; <sup>#</sup>P<0.05, CCL4 vs. N group. n=6. MgTX, margatoxin; HF, hepatic fibrosis; CCl4, carbon tetrachloride; CCL2, C-C motif chemokine ligand 2; MMP, matrix metalloproteinase; POSTN, periostin; ECM, extracellular matrix.</p></caption><graphic xlink:href="IJMM-45-01-0103-g03"></graphic><graphic xlink:href="IJMM-45-01-0103-g04"></graphic></fig><fig id="f3-ijmm-45-01-0103" orientation="portrait" position="float"><label>Figure 3</label><caption><p>MgTX decreases the expression of HF-associated proteins in RAW264.7 cells. To confirm the results of HF-associated proteins from immunohisto-chemistry in RAW264.7 cells, (A) western blot analysis was performed to examine the expression of MMP12, MM13, POSTN, CCL2, Kv1.3 and δ-catenin, which were downregulated by MgTX in the M1 phenotype groups. (B-G) MMP12, MM13, CCL2 and Kv1.3 were upregulated by MgTX in the M2 phenotype groups; however, POSTN and δ-catenin were downregulated by MgTX in the M2 phenotype groups. No significant difference was observed between the control (N) and MgTX groups. <sup>*</sup>P<0.05 vs. M1 group; <sup>#</sup>P<0.05 vs. M2 group. n=3. MgTX, margatoxin; HF, hepatic fibrosis; MMP, matrix metalloproteinase; POSTN, periostin; CCL2, C-C motif chemokine ligand 2.</p></caption><graphic xlink:href="IJMM-45-01-0103-g05"></graphic></fig><fig id="f4-ijmm-45-01-0103" orientation="portrait" position="float"><label>Figure 4</label><caption><p>MgTX regulates cytokine secretion <italic>in vivo</italic>. A total of 3 different MgTX concentrations were injected into mice via intraperitoneal injection. The cytokines in mouse serum were measured using ELISA kits, MgTX(H):0.41 mg/Kg, MgTX(M):0.14 mg/Kg, MgTX(L):0.04 mg/Kg. (A-F) ELISAs to detect the levels of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6 and IL-20) in-mouse serum. Cytokine levels of IL-10 were inhibited compared with the HF model group, whereas these levels were increased compared with the HF model group treated with MgTX. The cytokine levels of TGF-β group (n=6) increased in the model group, while there was no significant difference observed in the HF model group treated with MgTX. <sup>*</sup>P<0.05 vs. control group; <sup>#</sup>P<0.05 vs. model group. n=6. MgTX, margatoxin; TNF-α, tumor necrosis factor-α; IL, interleukin; TGF-β, transforming growth factor-β; HF, hepatic fibrosis.</p></caption><graphic xlink:href="IJMM-45-01-0103-g06"></graphic></fig><fig id="f5-ijmm-45-01-0103" orientation="portrait" position="float"><label>Figure 5</label><caption><p>MgTX regulates macrophage polarization <italic>in vitro</italic>. Reverse transcription-quantitative PCR and western blot analysis were performed to detect the expression of M1 markers and M2 markers in RAW264.7 cells. (A-H) mRNA expression levels of iNOS, CCL2, TNF-α and IL-1β were downregulated by MgTX in M1 phenotype macrophages. mRNA expression levels of IL-10, CD163, Arg-1, MAC-2 were upregulated in M2 phenotype macrophages treated with MgTX compared with M2 phenotype macrophages. (I-Q) protein expression levels of M1 markers (iNOS, CCL2, TNF-α and IL-1β) and protein expression levels of M2 markers (IL-10, CD163, Arg-1, Mrc2) were measured by western blot analysis. <sup>*</sup>P<0.05, <sup>**</sup>P<0.01, M1 vs. M1 + MgTX group, M2 vs. M2 + MgTX group. control group (N), n=3. MgTX, margatoxin; CCL2, C-C motif chemokine ligand 2; TNF-α, tumor necrosis factor-α; IL, interleukin; CD, cluster of differentiation.</p></caption><graphic xlink:href="IJMM-45-01-0103-g07"></graphic><graphic xlink:href="IJMM-45-01-0103-g08"></graphic></fig><fig id="f6-ijmm-45-01-0103" orientation="portrait" position="float"><label>Figure 6</label><caption><p>MgTX regulates macrophage polarization via the STAT1/STAT6 pathway. MgTX was administered to M1 phenotype macrophages or M2 phenotype macrophages, respectively, and the expression of phosphorylated STAT1/STAT6 was measured using western blot analysis. (A-C) Data are presented as the relative protein expression against control expression without treatment. The phosphorylated levels of STAT1/STAT6 in M1/M2 phenotype macrophages increased significantly compared with the control group, and p-STAT1 expression was downregulated in M1 phenotype macrophages treated with MgTX. <sup>*</sup>P<0.05 vs. M1 group; <sup>##</sup>P<0.01 vs. control group (N). p-STAT6 was upregulated in M2 phenotype macrophages treated with MgTX. <sup>**</sup>P<0.05 vs. M2 group; <sup>#</sup>P<0.05 vs. control group. n=3. MgTX, margatoxin.</p></caption><graphic xlink:href="IJMM-45-01-0103-g09"></graphic></fig><table-wrap id="tI-ijmm-45-01-0103" orientation="portrait" position="float"><label>Table I</label><caption><p>Sequences of primers used for RT-qPCR.</p></caption><table frame="hsides" rules="groups"><thead><tr><th valign="top" align="left" rowspan="1" colspan="1"></th><th valign="top" align="center" rowspan="1" colspan="1">Gene</th><th valign="top" align="center" rowspan="1" colspan="1">Amplicon size (bp)</th><th valign="top" align="center" rowspan="1" colspan="1">Forward primer (5′→3′)</th><th valign="top" align="center" rowspan="1" colspan="1">Reverse primer (5′→3′)</th></tr></thead><tbody><tr><td rowspan="9" valign="top" align="left" colspan="1">Mouse</td><td valign="top" align="left" rowspan="1" colspan="1">β-actin</td><td valign="top" align="center" rowspan="1" colspan="1">120</td><td valign="top" align="center" rowspan="1" colspan="1">AGTGTGACGTTGACATCCGT</td><td valign="top" align="center" rowspan="1" colspan="1">TGCTAGGAGCCAGAGCAGTA</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">CCL-2</td><td valign="top" align="center" rowspan="1" colspan="1">128</td><td valign="top" align="center" rowspan="1" colspan="1">AACTGCATCTGCCCTAAGGT</td><td valign="top" align="center" rowspan="1" colspan="1">CTGTCACACTGGTCACTCCT</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">Mrc2</td><td valign="top" align="center" rowspan="1" colspan="1">83</td><td valign="top" align="center" rowspan="1" colspan="1">ACGACTGTGAGACCTTCTGG</td><td valign="top" align="center" rowspan="1" colspan="1">CCTCCAGGACAGTGTGGATT</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">IL-10</td><td valign="top" align="center" rowspan="1" colspan="1">88</td><td valign="top" align="center" rowspan="1" colspan="1">TGCACTACCAAAGCCACAAG</td><td valign="top" align="center" rowspan="1" colspan="1">TCAGTAAGAGCAGGCAGCAT</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">Arg-1</td><td valign="top" align="center" rowspan="1" colspan="1">135</td><td valign="top" align="center" rowspan="1" colspan="1">GCAGTTGGAAGCATCTCTGG</td><td valign="top" align="center" rowspan="1" colspan="1">GAGAAAGGACACAGGTTGCC</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">TNF-α</td><td valign="top" align="center" rowspan="1" colspan="1">133</td><td valign="top" align="center" rowspan="1" colspan="1">GACAGTGACCTGGACTGTGG</td><td valign="top" align="center" rowspan="1" colspan="1">TGAGACAGAGGCAACCTGAC</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">IL-1β</td><td valign="top" align="center" rowspan="1" colspan="1">98</td><td valign="top" align="center" rowspan="1" colspan="1">GAAGAAGAGCCCATCCTCTG</td><td valign="top" align="center" rowspan="1" colspan="1">TCATCTCGGAGCCTGTAGTG</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">CD163</td><td valign="top" align="center" rowspan="1" colspan="1">94</td><td valign="top" align="center" rowspan="1" colspan="1">ATGGGTGGACACAGAATGGT</td><td valign="top" align="center" rowspan="1" colspan="1">AGCTCACAGCCACAACAAAG</td></tr><tr><td valign="top" align="left" rowspan="1" colspan="1">iNOS</td><td valign="top" align="center" rowspan="1" colspan="1">143</td><td valign="top" align="center" rowspan="1" colspan="1">CCTTGTTCAGCTACGCCTTC</td><td valign="top" align="center" rowspan="1" colspan="1">CTTCAGAGTCTGCCCATTGC</td></tr></tbody></table></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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