Study of pomegranate (Punica granatum L.) peel extract containing anthocyanins on fatty streak formation in the renal arteries in hypercholesterolemic rabbits
Identifieur interne : 000276 ( Pmc/Corpus ); précédent : 000275; suivant : 000277Study of pomegranate (Punica granatum L.) peel extract containing anthocyanins on fatty streak formation in the renal arteries in hypercholesterolemic rabbits
Auteurs : Fatemeh Sharifiyan ; Ahmad Movahedian-Attar ; Nafiseh Nili ; Sedigheh AsgarySource :
- Advanced Biomedical Research [ 2277-9175 ] ; 2016.
Abstract
The influence of the supplementation of pomegranate peel extract containing anthocyanins on atherosclerotic plaque formation induced by hypercholesterolemia was investigated in renal arteries in rabbits.
After the determination of polyphenol and anthocyanin's content of
The results reveal that
The results of this study indicate that consumption of pomegranate peel extract containing anthocyanins (polyphenol content 1 g/kg diet) despite of a significant increase in serum antioxidant capacity cannot protect the kidneys from hypercholesterolemia-induced damages during the treatment period.
Url:
DOI: 10.4103/2277-9175.175241
PubMed: 26962510
PubMed Central: 4770606
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Study of pomegranate (<italic>Punica granatum</italic> L.) peel extract containing anthocyanins on fatty streak formation in the renal arteries in hypercholesterolemic rabbits</title><author><name sortKey="Sharifiyan, Fatemeh" sort="Sharifiyan, Fatemeh" uniqKey="Sharifiyan F" first="Fatemeh" last="Sharifiyan">Fatemeh Sharifiyan</name><affiliation><nlm:aff id="aff1">Department of Basic Sciences, Payame Noor University, Tehran, Iran</nlm:aff></affiliation></author><author><name sortKey="Movahedian Attar, Ahmad" sort="Movahedian Attar, Ahmad" uniqKey="Movahedian Attar A" first="Ahmad" last="Movahedian-Attar">Ahmad Movahedian-Attar</name><affiliation><nlm:aff id="aff2">Department of Biochemistry, School of Pharmacy, Isfahan Cardiovascular Research Center, Applied Physiology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran</nlm:aff></affiliation></author><author><name sortKey="Nili, Nafiseh" sort="Nili, Nafiseh" uniqKey="Nili N" first="Nafiseh" last="Nili">Nafiseh Nili</name><affiliation><nlm:aff id="aff3">Roy and Ann Foss Interventional Cardiology Research Program, Terrence Donnelly Heart Centre, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, Ontario, Canada M5B 1W8</nlm:aff></affiliation></author><author><name sortKey="Asgary, Sedigheh" sort="Asgary, Sedigheh" uniqKey="Asgary S" first="Sedigheh" last="Asgary">Sedigheh Asgary</name><affiliation><nlm:aff id="aff4">Basic Sciences Department, Isfahan Cardiovascular Research Center, Applied Physiology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26962510</idno><idno type="pmc">4770606</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4770606</idno><idno type="RBID">PMC:4770606</idno><idno type="doi">10.4103/2277-9175.175241</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">000276</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Study of pomegranate (<italic>Punica granatum</italic> L.) peel extract containing anthocyanins on fatty streak formation in the renal arteries in hypercholesterolemic rabbits</title><author><name sortKey="Sharifiyan, Fatemeh" sort="Sharifiyan, Fatemeh" uniqKey="Sharifiyan F" first="Fatemeh" last="Sharifiyan">Fatemeh Sharifiyan</name><affiliation><nlm:aff id="aff1">Department of Basic Sciences, Payame Noor University, Tehran, Iran</nlm:aff></affiliation></author><author><name sortKey="Movahedian Attar, Ahmad" sort="Movahedian Attar, Ahmad" uniqKey="Movahedian Attar A" first="Ahmad" last="Movahedian-Attar">Ahmad Movahedian-Attar</name><affiliation><nlm:aff id="aff2">Department of Biochemistry, School of Pharmacy, Isfahan Cardiovascular Research Center, Applied Physiology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran</nlm:aff></affiliation></author><author><name sortKey="Nili, Nafiseh" sort="Nili, Nafiseh" uniqKey="Nili N" first="Nafiseh" last="Nili">Nafiseh Nili</name><affiliation><nlm:aff id="aff3">Roy and Ann Foss Interventional Cardiology Research Program, Terrence Donnelly Heart Centre, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, Ontario, Canada M5B 1W8</nlm:aff></affiliation></author><author><name sortKey="Asgary, Sedigheh" sort="Asgary, Sedigheh" uniqKey="Asgary S" first="Sedigheh" last="Asgary">Sedigheh Asgary</name><affiliation><nlm:aff id="aff4">Basic Sciences Department, Isfahan Cardiovascular Research Center, Applied Physiology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran</nlm:aff></affiliation></author></analytic><series><title level="j">Advanced Biomedical Research</title><idno type="eISSN">2277-9175</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec id="st1"><title>Background:</title><p>The influence of the supplementation of pomegranate peel extract containing anthocyanins on atherosclerotic plaque formation induced by hypercholesterolemia was investigated in renal arteries in rabbits.</p></sec><sec id="st2"><title>Materials and Methods:</title><p>After the determination of polyphenol and anthocyanin's content of <italic>P. granatum</italic> peel hydroalcoholic extract, 30 male rabbits were randomly divided into three groups. They were fed basic diet, hypercholesterolemic diet and hypercholesterolemic diet along with <italic>P. granatum</italic> peel extract (polyphenolic content for each rabbit 1 g/kg diet) for 2 month. Blood samples were collected at the begging, middle and end of the study in order to measure lipid concentration and oxidative and antioxidative status variables, and renal arteries were taken for the assessment of atherosclerotic plaques at the end of the study.</p></sec><sec id="st3"><title>Results:</title><p>The results reveal that <italic>P. granatum</italic> peel extract significantly increases serum antioxidant capacity in the extract recipient group in comparison with hypercholesterolemic control (<italic>P</italic> < 0.05). No significant differences are observed in total cholesterol, triglyceride, low-density lipoprotein, high-density lipoprotein, very low-density lipoprotein and in mean size of accumulated fatty streaks in renal arteries in the extract treatment group in comparison with hypercholesterolemic control (<italic>P</italic> > 0.05).</p></sec><sec id="st4"><title>Conclusion:</title><p>The results of this study indicate that consumption of pomegranate peel extract containing anthocyanins (polyphenol content 1 g/kg diet) despite of a significant increase in serum antioxidant capacity cannot protect the kidneys from hypercholesterolemia-induced damages during the treatment period.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Rai, P" uniqKey="Rai P">P Rai</name></author><author><name sortKey="Gigliotti, Os" uniqKey="Gigliotti O">OS Gigliotti</name></author><author><name sortKey="Mathews, B" uniqKey="Mathews B">B 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uniqKey="Zhang Y">YZ Zhang</name></author><author><name sortKey="Chung, Hk" uniqKey="Chung H">HK Chung</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Adv Biomed Res</journal-id><journal-id journal-id-type="iso-abbrev">Adv Biomed Res</journal-id><journal-id journal-id-type="publisher-id">ABR</journal-id><journal-title-group><journal-title>Advanced Biomedical Research</journal-title></journal-title-group><issn pub-type="epub">2277-9175</issn><publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name><publisher-loc>India</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26962510</article-id><article-id pub-id-type="pmc">4770606</article-id><article-id pub-id-type="publisher-id">ABR-5-8</article-id><article-id pub-id-type="doi">10.4103/2277-9175.175241</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject></subj-group></article-categories><title-group><article-title>Study of pomegranate (<italic>Punica granatum</italic> L.) peel extract containing anthocyanins on fatty streak formation in the renal arteries in hypercholesterolemic rabbits</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Sharifiyan</surname><given-names>Fatemeh</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Movahedian-Attar</surname><given-names>Ahmad</given-names></name><xref ref-type="aff" rid="aff2">1</xref><xref ref-type="corresp" rid="cor1"></xref></contrib><contrib contrib-type="author"><name><surname>Nili</surname><given-names>Nafiseh</given-names></name><xref ref-type="aff" rid="aff3">2</xref></contrib><contrib contrib-type="author"><name><surname>Asgary</surname><given-names>Sedigheh</given-names></name><xref ref-type="aff" rid="aff4">3</xref></contrib></contrib-group><aff id="aff1">Department of Basic Sciences, Payame Noor University, Tehran, Iran</aff><aff id="aff2"><label>1</label>Department of Biochemistry, School of Pharmacy, Isfahan Cardiovascular Research Center, Applied Physiology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran</aff><aff id="aff3"><label>2</label>Roy and Ann Foss Interventional Cardiology Research Program, Terrence Donnelly Heart Centre, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, Ontario, Canada M5B 1W8</aff><aff id="aff4"><label>3</label>Basic Sciences Department, Isfahan Cardiovascular Research Center, Applied Physiology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran</aff><author-notes><corresp id="cor1"><bold>Address for correspondence:</bold> Dr. Ahmad Movahedian-Attar, Department of Biochemistry, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran. E-mail: <email xlink:href="movahedian@pharm.mui.ac.ir">movahedian@pharm.mui.ac.ir</email></corresp></author-notes><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>29</day><month>1</month><year>2016</year></pub-date><volume>5</volume><elocation-id>8</elocation-id><history><date date-type="received"><day>27</day><month>4</month><year>2013</year></date><date date-type="accepted"><day>02</day><month>6</month><year>2014</year></date></history><permissions><copyright-statement>Copyright: © 2016 Sharifiyan.</copyright-statement><copyright-year>2016</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p></license></permissions><abstract><sec id="st1"><title>Background:</title><p>The influence of the supplementation of pomegranate peel extract containing anthocyanins on atherosclerotic plaque formation induced by hypercholesterolemia was investigated in renal arteries in rabbits.</p></sec><sec id="st2"><title>Materials and Methods:</title><p>After the determination of polyphenol and anthocyanin's content of <italic>P. granatum</italic> peel hydroalcoholic extract, 30 male rabbits were randomly divided into three groups. They were fed basic diet, hypercholesterolemic diet and hypercholesterolemic diet along with <italic>P. granatum</italic> peel extract (polyphenolic content for each rabbit 1 g/kg diet) for 2 month. Blood samples were collected at the begging, middle and end of the study in order to measure lipid concentration and oxidative and antioxidative status variables, and renal arteries were taken for the assessment of atherosclerotic plaques at the end of the study.</p></sec><sec id="st3"><title>Results:</title><p>The results reveal that <italic>P. granatum</italic> peel extract significantly increases serum antioxidant capacity in the extract recipient group in comparison with hypercholesterolemic control (<italic>P</italic> < 0.05). No significant differences are observed in total cholesterol, triglyceride, low-density lipoprotein, high-density lipoprotein, very low-density lipoprotein and in mean size of accumulated fatty streaks in renal arteries in the extract treatment group in comparison with hypercholesterolemic control (<italic>P</italic> > 0.05).</p></sec><sec id="st4"><title>Conclusion:</title><p>The results of this study indicate that consumption of pomegranate peel extract containing anthocyanins (polyphenol content 1 g/kg diet) despite of a significant increase in serum antioxidant capacity cannot protect the kidneys from hypercholesterolemia-induced damages during the treatment period.</p></sec></abstract><kwd-group><title>Key Words</title><kwd>Anthocyanin</kwd><kwd>atherosclerosis</kwd><kwd>pomegranate peel</kwd><kwd>renal artery stenosis</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="sec1-1"><title>INTRODUCTION</title><p>Renal artery stenosis (RAS) is defined as a 50% or greater occlusion of a renal artery (unilateral or bilateral).[<xref rid="ref1" ref-type="bibr">1</xref>] RAS may create by atherosclerosis in elderly people or fibro-muscular dysplasia in young women.[<xref rid="ref2" ref-type="bibr">2</xref><xref rid="ref3" ref-type="bibr">3</xref>] It affects blood circulation in kidney and then it can cause renovascular hypertension and renal insufficiency.[<xref rid="ref4" ref-type="bibr">4</xref><xref rid="ref5" ref-type="bibr">5</xref>] Atherosclerotic renal artery stenosis is a common disease in patients older than 50 years particularly those with diffuse atherosclerotic vascular disease.[<xref rid="ref6" ref-type="bibr">6</xref>] This subject is the most usual cause of increasing blood pressure.[<xref rid="ref7" ref-type="bibr">7</xref>] Atherosclerosis is an inflammatory disease that is caused by accumulation of lipids in intima and media of large and medium-sized artery and after decades thicken the inner layer of artery.[<xref rid="ref8" ref-type="bibr">8</xref>] In fact, the earliest type of lesion called fatty streak starts in the first decades of life but symptom of this disease doesn’t appear until middle age and after that.[<xref rid="ref9" ref-type="bibr">9</xref>] Risk factors of atherosclerotic renal artery stenosis include long-term hypertension, diabetes mellitus, smoking and dislipidemia. These factors are considered as risk factors of suddenly coronary disease.[<xref rid="ref3" ref-type="bibr">3</xref>] Epidemiologic studies confirm associations between renovascular diseases and mortality of cardiovascular.[<xref rid="ref10" ref-type="bibr">10</xref>]</p><p>Using of complementary nutrition supplements rich in antioxidants is effective for inhibition atherogenic changes of low-density lipoprotein (LDL), formation of foam cells and finally inhibition of atherosclerosis.</p><p>Pomegranate with scientific name <italic>Punica granatum</italic> L. from Punicaceae family is an important source of polyphenols and other antioxidants.[<xref rid="ref11" ref-type="bibr">11</xref><xref rid="ref12" ref-type="bibr">12</xref>] Pomegranate can be divided into three parts: Seeds, peel, and juice, all of which seem to have medicinal benefits. Pomegranate extracts have been used since ancient times to treat several conditions including parasitic and microbial infections, diarrhea, ulcers, aphthae, hemorrhage, and respiratory complications.[<xref rid="ref13" ref-type="bibr">13</xref><xref rid="ref14" ref-type="bibr">14</xref>] Moreover, other therapeutic properties such as antitumor, anti-inflammatory, antiviral, antibacterial, antidiarrheal, and antiobesity are currently under investigation.[<xref rid="ref15" ref-type="bibr">15</xref>] Many beneficial effects are related to the presence of ellagic acid, ellagitannins (including punicalagins), punicic acid and other fatty acids, flavonoids, anthocyanidins, anthocyanins, estrogenic flavonols, and flavones, which seem to be its most therapeutically beneficial components.[<xref rid="ref14" ref-type="bibr">14</xref>] The pomegranate peels make up about 60% of the fruit, and they are rich in many compounds such as phenolics, flavonoids, ellagitannins (including punicalagins), proanthocyanidin compounds, complex polysaccharides, and many minerals.[<xref rid="ref16" ref-type="bibr">16</xref>] The peel is the part of the fruit with the highest antioxidant activity, which is in line with its high content of polyphenols. The results of investigation and comparison of antioxidants of the peel, pulp and seed in 28 different spices show that pomegranate peel has the highest antioxidant activity.[<xref rid="ref17" ref-type="bibr">17</xref><xref rid="ref18" ref-type="bibr">18</xref>] Anthocyanins, an antioxidant in peel, are the most important and abundant natural pigments belonging flavonoid family.[<xref rid="ref19" ref-type="bibr">19</xref><xref rid="ref20" ref-type="bibr">20</xref>]</p><p>This study was designed to evaluate the effects of extract containing anthocyanins of pomegranate peel on formation and progress of fatty streaks in renal arteries as well as biochemical factors involving this process in male hypercholesterolemic rabbits.</p></sec><sec sec-type="materials|methods" id="sec1-2"><title>MATERIALS AND METHODS</title><p><italic>Punica granatum</italic> L. (post siah Saveh) was supplied and authenticated at the Research Centre of Isfahan Province Natural Resources. Then required parts of the plant (peel) were dried at room temperature. The dried peels were ground and extracted with soaked method. Plant powder (50 g) was soaked in 100 ml ethanol 70% and 1% acetic acid and was stirred for 24 hours. The hydroalcoholic extract was centrifuged for 10 min (11000 g) and supernatant was used for determination of total polyphenols and total anthocyanin content.[<xref rid="ref21" ref-type="bibr">21</xref>] The extracts were concentrated under vacuum at 40°C and the resulted powder was stored at −80°C until used.</p><sec id="sec2-1"><title>Determination of total polyphenol content</title><p>Total polyphenol content in the extract was determined using the Folin-Ciocalteau assay.[<xref rid="ref22" ref-type="bibr">22</xref>] One milliliter of extract solution or standard solution of garlic acid (20, 40, 60, 80 and 100 mg/l) was added in a test tube containing 9 ml dieionized-distilled water (dd H<sub>2</sub>O). A reagent blank using dd H<sub>2</sub>O was prepared. One milliliter of Folin-Ciocalteau's phenol reagent was added to the mixture and shaken. After 30 sec to 8 min, 10 ml of 7% Na<sub>2</sub>CO<sub>3</sub> was added, then total volume was reached to 20 ml with dd H<sub>2</sub>O. After incubation for 90 min at room temperature the absorbance against prepared reagent blank was determined at 750 nanometers. Total phenolic content of extract was expressed as mg gallic acid equivalents (GAE)/100 g dried peel powder. All samples were analyzed in triplicates.</p></sec><sec id="sec2-2"><title>Determination of total anthocyanin content</title><p>We used the method described by Lapornik <italic>et al</italic>. for determination of total anthocyanins.[<xref rid="ref21" ref-type="bibr">21</xref>] The principle of this method is pH decreasing of extracts to the values between 0.5 and 0.8, what causes all anthocyanins to transform to flavilium cation, which is colored red.</p><p>One milliliter of extract was pipetted into two tubes. 1 ml of 0.01% HCl solution in 95% ethanol was added into each tube. After that into the first tube (A1) 10 ml of 2% aqueous HCl solution was added, into another tube (A2) 10 ml of solution with pH = 3.5 (prepared from 0.2 M Na<sub>2</sub>HPO<sub>4</sub> and 0.1 M citric acid). The absorbances of both samples were measured at 520 nm against blank sample (water instead of extract). All samples were analyzed in triplicates, and the mean content of total anthocyanins was calculated with this equation.</p><p>Content of total anthocyanins (mg/l) = (A1–A2) × f</p><p>f = 396/598</p></sec><sec id="sec2-3"><title>Animal treatment</title><p>Thirty male New Zealand white rabbits with the average weight of 1.5 kg were purchased from Pastor Institute, Teheran, Iran. The rabbits were acclimated in an air conditioned room for 2 weeks and daily provided with 100 g basic diet and free access for water. Then they were randomly divided into three groups of 10 animals each. Each group of animals had its specific diet. Rabbits fed a basic diet were used as normal controls, hypercholesterolemic control group (fed 1% high-cholesterol diet),[<xref rid="ref23" ref-type="bibr">23</xref>] treatment group (fed 1% high cholesterol diet supplemented with hydroalcoholic extract of pomegranate peel). The extract powder was dissolved in water and was fed to the treatment group via gavage route at 1 gr (in terms of polyphenolic content)/kg diet.[<xref rid="ref24" ref-type="bibr">24</xref>] The experiment was conducted for 60 days.</p><p>Hypercholesterolemic was induced in animals with gavage 1 gr cholesterol powder in olive oil (without E and C vitamins and other antioxidants) daily.</p><p>Animals were weighted at the beginning, middle and end of the study to clarify the effects of dietary intake of anthocyanins.</p></sec><sec id="sec2-4"><title>Assay for serum lipids</title><p>Fasting blood samples were taken in beginning, middle and end of the study to measure total cholesterol (TC), triglyceride (TG), high-density lipoprotein (HDL), and low-density lipoprotein (LDL). Lipid levels were determined using an automated enzymatic assay by an auto-analyzer Hitachi 902-model and Zist-Chem kits from Germany. Very low-density lipoprotein (VLDL) was calculated with the Friedwal formula.[<xref rid="ref25" ref-type="bibr">25</xref>]</p></sec><sec id="sec2-5"><title>Determination of antioxidant capacity (AC)</title><p>In this study, antioxidant capacity was measured according to inhibition percentage of globular lysis. After preparing 20% globular suspension, this suspension along with serum of animals (normal control, hypercholesterolemic control group, treatment group) was incubated at 37°C for 10 minutes. Then 1 ml 2–2’-azo-bis- (2-amidinopropane) dihydrochloride (AAPH) (40 mM) was added to each tube and tubes were incubated for 24 h at room temperature. After that tubes were centrifuged (3000 rpm for 10 min) and absorption of the supernatant solution at 540 nm was measured using a spectrophotometer.[<xref rid="ref26" ref-type="bibr">26</xref>]</p><p>Percentage of inhibition cell lysis was defined as follow:</p><p>(1-ODT/ODS) × 100</p><p>ODT = Optical Density in Test tube</p><p>ODS = Optical Density in Standard tube</p></sec><sec id="sec2-6"><title>Histological evaluation of atherosclerosis</title><p>At the end of the treatment period, the rabbits were killed and then left and right renal arteries from ostium to 2-cm proximal segment were excised and kept in 10% formalin solution to be used for pathologic evaluation with respect to the presence of fatty streaks.[<xref rid="ref2" ref-type="bibr">2</xref>] After slicing and staining with hematoxylin, eozine, tissue specimens were used for determination of relative size plaque.</p><p><inline-graphic xlink:href="ABR-5-8-g001.jpg"></inline-graphic></p><p>The mean of the relative size plaques in renal arteries of each rabbit were considered as the mean of relative size plaque in that rabbit and the mean of relative size of each group was compared separately with the other experimental groups.</p></sec><sec id="sec2-7"><title>Statistical analysis</title><p>Results were expressed as the Mean ± SD. All analyses were performed using SPSS 10 statistical software. Data were analyzed by univariate ANOVA. If a resultant fraction was found to be significant, i.e., established at <italic>P</italic> < 0.05, a post-ANOVA Tukey's test was used to specify pair-wise differences.</p></sec></sec><sec sec-type="results" id="sec1-3"><title>RESULTS</title><p>Quantitative results of the isolated extract from the analyzed herb are shown in <xref ref-type="table" rid="T1">Table 1</xref>.</p><table-wrap id="T1" position="float"><label>Table 1</label><caption><p>Mean of yield (ml/100gr pomegranate peel dry weight), mean of total polyphenols (mg gallic acid/100 gr pomegranate peel dry weight) and mean of total anthocyanins (mg/100 gr pomegranate peel dry weight)</p></caption><graphic xlink:href="ABR-5-8-g002"></graphic></table-wrap><sec id="sec2-8"><title>Biochemical factors</title><p>The results showed that at the beginning of the study there was no significant difference between studied groups regarding biochemical factors (TC, TG, HDL, LDL, VLDL) and serum antioxidant capacity (<italic>P</italic> > 0.05). In the middle and end of the study, the hypercholesterolemic diet increased the level of biochemical factors (TC, TG, HDL, LDL, VLDL) and decreased serum antioxidant capacity in the hypercholesterolemic control group as compared to the normal control group and as compared to the beginning of the study (<italic>P</italic> < 0.05). In the middle and end of the study, in the treatment group there was no significant difference in biochemical factors as compared with the hypercholesterolemic control group (<italic>P</italic> > 0.05) but about serum antioxidant capacity there was significant difference only at the end of the study (<italic>P</italic> < 0.05) [<xref ref-type="table" rid="T2">Table 2</xref>].</p><table-wrap id="T2" position="float"><label>Table 2</label><caption><p>The effect of extract containing anthocyanins on serum biochemical factors: Results are shown as mean ± SD</p></caption><graphic xlink:href="ABR-5-8-g003"></graphic></table-wrap></sec><sec id="sec2-9"><title>Weight evaluation</title><p>At the beginning, middle and end of the study animals were weighted and there was no significant difference between the weight in the treatment group and the hypercholesterolemic control group (<italic>P</italic> > 0.05).</p></sec><sec id="sec2-10"><title>Pathological results</title><p>Pathological assessments showed that in normal control, atherosclerotic changes were absent and inner surfaces of two renal arteries were normal and no injury was seen in intima and media. By contrast, in the hypercholesterolemic control group, protruding atherosclerotic plaques were recognizable. In these plaques, macrophages filled with lipid droplets constituted the foam cells [<xref ref-type="fig" rid="F1">Figure 1</xref>].</p><fig id="F1" position="float"><label>Figure 1</label><caption><p>Pathological evaluation of renal arteries in all groups: (a) normal control group, (×40) normal arterial wall, (b) hypercholesterolemic control group (×10) highly protruding atherosclerotic plaque, (c) treatment group (×10) foam cells in intima. Arrows: Atherosclerotic plaques</p></caption><graphic xlink:href="ABR-5-8-g004"></graphic></fig><p>The mean relative sizes of plaques in renal arteries were 0.12 ± 0.10 and 0.11 ± 0.09 μm in the hypercholesterolemic control group and treatment group, respectively. However, this size showed a reduction in the treatment group as compared to the hypercholesterolemic control group, but this difference wasn’t significant (<italic>P</italic> > 0.05) [<xref ref-type="fig" rid="F2">Figure 2</xref>].</p><fig id="F2" position="float"><label>Figure 2</label><caption><p>The relative mean of atherosclerotic plaque thickness in the groups under study; Results are shown as mean ± SD; *Significance of difference compared to the hypercholesterolemic control group (P < 0.05)</p></caption><graphic xlink:href="ABR-5-8-g005"></graphic></fig></sec></sec><sec sec-type="discussion" id="sec1-4"><title>DISCUSSION</title><p>The results of polyphenol content show that the polyphenol content of extract is 0/070%. This result is comparable to results reported with Sultana <italic>et al</italic>.[<xref rid="ref27" ref-type="bibr">27</xref>] In this study, method of extraction causes that extraction of anthocyanins are done more than of other polyphenols, so that more than 98% of polyphenol content are related to anthocyanins. The results of serum lipid measurements in hypercholesterolemic animals administrated with extract show that they have no significant difference as compared with the hypercholesterolemic control group. In the study performed by Fatma Labib <italic>et al</italic>. it was shown that in hypercholesterolemic rats fed with 1, 2 and 3% ethanolic extract of peel pomegranate levels of tested parameters (TC, TG, LDL and VLDL) except HDL decreased significantly as compared with hypercholesterolemic control.[<xref rid="ref11" ref-type="bibr">11</xref>] In the same study, the methanolic extract of peel pomegranate significantly decreased TC, TG, LDL and VLDL and increased HDL in hypercholesterolemic rats as compared with hypercholesterolemic control.[<xref rid="ref28" ref-type="bibr">28</xref>] Beside, studies performed with some groups of researchers show that rats are not a suitable model for induction hypercholesterolemia.[<xref rid="ref29" ref-type="bibr">29</xref><xref rid="ref30" ref-type="bibr">30</xref>] In a study Uchid <italic>et al</italic>. showed that diet supplemented with 2% cholesterol makes a temporary increase in plasma cholesterol. As well as, this diet strikingly increases the level of cholesterol in liver, biliary excretion of bile acids and excretion of bile acids and sterols in feces.</p><p>As a result, more studies are necessary for determination antihyperlipidemic effects of different doses of pomegranate peel extract that they are consumed during different times in admissible model animal to induce hypercholesterolemia.</p><p>The results of biochemical factors in this study show that using cholesterol in the hypercholesterolemic control group decreases serum antioxidant capacity (227%). Using extract containing anthocyanins of peel pomegranate in hypercholesterolemic animals increases 80% serum antioxidant capacity as compared with the hypercholesterolemic control group.</p><p>However, amount of antioxidant capacity in the end of the study in the treatment group is decreased 131% as compared with the normal control group. According to oxidative stress caused in hypercholesterolemic animals and decline in antioxidant capacity of serum in the hypercholesterolemic control group; it seems that using extract in the treatment group increases antioxidant capacity.</p><p>Toxicity mechanisms induced with AAPH as a producer of soluble free radicals in water are created by inducing cell membrane peroxidation that destroys aminophospholipid arrangement in a bilayer membrane of cell and causes leakage of material out of the cell.[<xref rid="ref26" ref-type="bibr">26</xref>] In the study by Parmer <italic>et al</italic>. it was reported that the alcoholic extract of peel pomegranate is able to scavenge free radicals such as β-carotene, DPPH, NO and prevents lipid peroxidation induced with H<sub>2</sub>O<sub>2</sub> in red blood cells and liver.[<xref rid="ref31" ref-type="bibr">31</xref>]</p><p>In a similar study, Li <italic>et al</italic>. showed that the peel extract of pomegranate has more antioxidant properties as compared with the nutritional part of pomegranate. The results of this study show that the peel extract of pomegranate notably increases antioxidant capacity for inhibition of free radicals such as peroxyl, hydroxyl and superoxide.[<xref rid="ref17" ref-type="bibr">17</xref>] Hence, it seems that in this study in the treatment group, an increase in serum concentration of polyphenols specially anthocyanins can protect human erythrocytes versus injury of free radicals resulting from AAPH.</p><p>The pathology results demonstrate that high-cholesterol diet significantly increases formation of fatty streaks in renal arteries of the hypercholesterolemic control group as compared normal control. Comparing the hypercholesterolemic control group with normal control illustrates that hypercholesterolemic diet develops hyperlipidemia, reduction in total antioxidant capacity and subsequence formation of fatty streaks as a first visible lesion of atherosclerosis.</p><p>Yong-hui <italic>et al</italic>. in their study indicate that hypercholesterolemia condition in rabbits not only increases serum lipid parameters but also decreases renal GFR. Also, this situation increases formation of lipidemic plaque in renal arteries and enhances expression of the LOX1 gene as a receptor of OX-LDL.[<xref rid="ref32" ref-type="bibr">32</xref>]</p><p>In this study plaque's relative size in renal arteries of hypercholesterolemic animals treated with extract aren’t significantly different as compared the hypercholeterolemic control group. The results of this study and other similar studies express that favorable effects of antioxidants on kidneys depend on dose of extract, time of consumption and extract composition. A study by Reckelhoff <italic>et al</italic>. proves this claim. In this study, they used E vitamin to inhibit oxidative stress and improve kidney function in old rats for 9 months. The results showed that high doses of this vitamin are more effective than low doses.[<xref rid="ref33" ref-type="bibr">33</xref>]</p><p>Usage of vitamin E for 4 weeks in hypercholesterolemic rabbits doesn’t have vital effects on improvement of endothelial of renal kidney function,[<xref rid="ref34" ref-type="bibr">34</xref>] while usage for 12 and 32 weeks of this vitamin decreases kidney injuries.[<xref rid="ref35" ref-type="bibr">35</xref><xref rid="ref36" ref-type="bibr">36</xref>]</p><p>Therefore, more studies with higher doses and longer duration of using of pomegranate peel extract are necessary to clarify the effects of this extract on the renal arteries.</p><p>The results show that in this study using 1 g/kg diet of extract containing anthocyanins of peel pomegranate for 8 weeks doesn’t have antihyperlipidemic effects and despite of a significant increase in serum antioxidant capacity can’t protect kidneys from hypercholesterolemia-induced damages and development of lipidemic 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