JNK and PI3k/Akt signaling pathways are required for establishing persistent SARS-CoV infection in Vero E6 cells.
Identifieur interne : 004777 ( Main/Curation ); précédent : 004776; suivant : 004778JNK and PI3k/Akt signaling pathways are required for establishing persistent SARS-CoV infection in Vero E6 cells.
Auteurs : Tetsuya Mizutani [Japon] ; Shuetsu Fukushi ; Masayuki Saijo ; Ichiro Kurane ; Shigeru MorikawaSource :
- Biochimica et biophysica acta [ 0006-3002 ] ; 2005.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- Animals, Chlorocebus aethiops, JNK Mitogen-Activated Protein Kinases (metabolism), Phosphatidylinositol 3-Kinases (metabolism), Protein-Serine-Threonine Kinases (metabolism), Proto-Oncogene Proteins (metabolism), Proto-Oncogene Proteins c-akt, SARS Virus (pathogenicity), Signal Transduction, Vero Cells.
- MESH :
- chemical , metabolism : JNK Mitogen-Activated Protein Kinases, Protein-Serine-Threonine Kinases, Proto-Oncogene Proteins.
- metabolism : Phosphatidylinositol 3-Kinases.
- pathogenicity : SARS Virus.
- Animals, Chlorocebus aethiops, Proto-Oncogene Proteins c-akt, Signal Transduction, Vero Cells.
Abstract
Persistence was established after most of the SARS-CoV-infected Vero E6 cells died. RNA of the defective interfering virus was not observed in the persistently infected cells by Northern blot analysis. SARS-CoV diluted to 2 PFU failed to establish persistence, suggesting that some particular viruses in the seed virus did not induce persistent infection. Interestingly, a viral receptor, angiotensin converting enzyme (ACE)-2, was down-regulated in persistently infected cells. G418-selected clones established from parent Vero E6 cells, which were transfected with a plasmid containing the neomycin resistance gene, were infected with SARS-CoV, resulting in a potential cell population capable of persistence in Vero E6 cells. Our previous studies demonstrated that signaling pathways of extracellular signal-related kinase (ERK1/2), c-Jun N-terminal protein kinase (JNK), p38 mitogen-activated protein kinase (MAPK), and phosphatidylinositol 3'-kinase (PI3K)/Akt were activated in SARS-CoV-infected Vero E6 cells. Previous studies also showed that the activation of p38 MAPK by viral infection-induced apoptosis, and a weak activation of Akt was not sufficient to protect from apoptosis. In the present study, we showed that the inhibitors of JNK and PI3K/Akt inhibited the establishment of persistence, but those of MAPK/ERK kinase (MEK; as an inhibitor for ERK1/2) and p38 MAPK did not. These results indicated that two signaling pathways of JNK and PI3K/Akt were important for the establishment of persistence in Vero E6 cells.
DOI: 10.1016/j.bbadis.2005.04.004
PubMed: 15916886
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pubmed:15916886Le document en format XML
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<term>JNK Mitogen-Activated Protein Kinases (metabolism)</term>
<term>Phosphatidylinositol 3-Kinases (metabolism)</term>
<term>Protein-Serine-Threonine Kinases (metabolism)</term>
<term>Proto-Oncogene Proteins (metabolism)</term>
<term>Proto-Oncogene Proteins c-akt</term>
<term>SARS Virus (pathogenicity)</term>
<term>Signal Transduction</term>
<term>Vero Cells</term>
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<term>Phosphatidylinositol 3-kinases (métabolisme)</term>
<term>Protein-Serine-Threonine Kinases (métabolisme)</term>
<term>Protéines proto-oncogènes (métabolisme)</term>
<term>Protéines proto-oncogènes c-akt</term>
<term>Transduction du signal</term>
<term>Virus du SRAS (pathogénicité)</term>
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<term>Proto-Oncogene Proteins</term>
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<term>Protein-Serine-Threonine Kinases</term>
<term>Protéines proto-oncogènes</term>
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<term>Chlorocebus aethiops</term>
<term>Proto-Oncogene Proteins c-akt</term>
<term>Signal Transduction</term>
<term>Vero Cells</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Animaux</term>
<term>Cellules Vero</term>
<term>Protéines proto-oncogènes c-akt</term>
<term>Transduction du signal</term>
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<front><div type="abstract" xml:lang="en">Persistence was established after most of the SARS-CoV-infected Vero E6 cells died. RNA of the defective interfering virus was not observed in the persistently infected cells by Northern blot analysis. SARS-CoV diluted to 2 PFU failed to establish persistence, suggesting that some particular viruses in the seed virus did not induce persistent infection. Interestingly, a viral receptor, angiotensin converting enzyme (ACE)-2, was down-regulated in persistently infected cells. G418-selected clones established from parent Vero E6 cells, which were transfected with a plasmid containing the neomycin resistance gene, were infected with SARS-CoV, resulting in a potential cell population capable of persistence in Vero E6 cells. Our previous studies demonstrated that signaling pathways of extracellular signal-related kinase (ERK1/2), c-Jun N-terminal protein kinase (JNK), p38 mitogen-activated protein kinase (MAPK), and phosphatidylinositol 3'-kinase (PI3K)/Akt were activated in SARS-CoV-infected Vero E6 cells. Previous studies also showed that the activation of p38 MAPK by viral infection-induced apoptosis, and a weak activation of Akt was not sufficient to protect from apoptosis. In the present study, we showed that the inhibitors of JNK and PI3K/Akt inhibited the establishment of persistence, but those of MAPK/ERK kinase (MEK; as an inhibitor for ERK1/2) and p38 MAPK did not. These results indicated that two signaling pathways of JNK and PI3K/Akt were important for the establishment of persistence in Vero E6 cells.</div>
</front>
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