Iridovirus CARD Protein Inhibits Apoptosis through Intrinsic and Extrinsic Pathways

Grouper iridovirus (GIV) belongs to the genus Ranavirus of the family Iridoviridae; the genomes of such viruses contain an anti-apoptotic caspase recruitment domain (CARD) gene. The GIV-CARD gene encodes a protein of 91 amino acids with a molecular mass of 10,505 Daltons, and shows high similarity t...

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Veröffentlicht in:PloS one 2015-06, Vol.10 (6), p.e0129071-e0129071
Hauptverfasser: Chen, Chien-Wen, Wu, Ming-Shan, Huang, Yi-Jen, Lin, Pei-Wen, Shih, Chueh-Ju, Lin, Fu-Pang, Chang, Chi-Yao
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container_title PloS one
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Wu, Ming-Shan
Huang, Yi-Jen
Lin, Pei-Wen
Shih, Chueh-Ju
Lin, Fu-Pang
Chang, Chi-Yao
description Grouper iridovirus (GIV) belongs to the genus Ranavirus of the family Iridoviridae; the genomes of such viruses contain an anti-apoptotic caspase recruitment domain (CARD) gene. The GIV-CARD gene encodes a protein of 91 amino acids with a molecular mass of 10,505 Daltons, and shows high similarity to other viral CARD genes and human ICEBERG. In this study, we used Northern blot to demonstrate that GIV-CARD transcription begins at 4 h post-infection; furthermore, we report that its transcription is completely inhibited by cycloheximide but not by aphidicolin, indicating that GIV-CARD is an early gene. GIV-CARD-EGFP and GIV-CARD-FLAG recombinant proteins were observed to translocate from the cytoplasm into the nucleus, but no obvious nuclear localization sequence was observed within GIV-CARD. RNA interference-mediated knockdown of GIV-CARD in GK cells infected with GIV inhibited expression of GIV-CARD and five other viral genes during the early stages of infection, and also reduced GIV infection ability. Immunostaining was performed to show that apoptosis was effectively inhibited in cells expressing GIV-CARD. HeLa cells irradiated with UV or treated with anti-Fas antibody will undergo apoptosis through the intrinsic and extrinsic pathways, respectively. However, over-expression of recombinant GIV-CARD protein in HeLa cells inhibited apoptosis induced by mitochondrial and death receptor signaling. Finally, we report that expression of GIV-CARD in HeLa cells significantly reduced the activities of caspase-8 and -9 following apoptosis triggered by anti-Fas antibody. Taken together, these results demonstrate that GIV-CARD inhibits apoptosis through both intrinsic and extrinsic pathways.
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The GIV-CARD gene encodes a protein of 91 amino acids with a molecular mass of 10,505 Daltons, and shows high similarity to other viral CARD genes and human ICEBERG. In this study, we used Northern blot to demonstrate that GIV-CARD transcription begins at 4 h post-infection; furthermore, we report that its transcription is completely inhibited by cycloheximide but not by aphidicolin, indicating that GIV-CARD is an early gene. GIV-CARD-EGFP and GIV-CARD-FLAG recombinant proteins were observed to translocate from the cytoplasm into the nucleus, but no obvious nuclear localization sequence was observed within GIV-CARD. RNA interference-mediated knockdown of GIV-CARD in GK cells infected with GIV inhibited expression of GIV-CARD and five other viral genes during the early stages of infection, and also reduced GIV infection ability. Immunostaining was performed to show that apoptosis was effectively inhibited in cells expressing GIV-CARD. HeLa cells irradiated with UV or treated with anti-Fas antibody will undergo apoptosis through the intrinsic and extrinsic pathways, respectively. However, over-expression of recombinant GIV-CARD protein in HeLa cells inhibited apoptosis induced by mitochondrial and death receptor signaling. Finally, we report that expression of GIV-CARD in HeLa cells significantly reduced the activities of caspase-8 and -9 following apoptosis triggered by anti-Fas antibody. 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This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2015 Chen et al 2015 Chen et al</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c692t-d07bdf6753d648c06034698f052fabd49283874925cb0f753a4b12f4b80a80213</citedby><cites>FETCH-LOGICAL-c692t-d07bdf6753d648c06034698f052fabd49283874925cb0f753a4b12f4b80a80213</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4457926/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4457926/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,864,885,2102,2928,23866,27924,27925,53791,53793</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26047333$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><contributor>Srinivasula, Srinivasa M</contributor><creatorcontrib>Chen, Chien-Wen</creatorcontrib><creatorcontrib>Wu, Ming-Shan</creatorcontrib><creatorcontrib>Huang, Yi-Jen</creatorcontrib><creatorcontrib>Lin, Pei-Wen</creatorcontrib><creatorcontrib>Shih, Chueh-Ju</creatorcontrib><creatorcontrib>Lin, Fu-Pang</creatorcontrib><creatorcontrib>Chang, Chi-Yao</creatorcontrib><title>Iridovirus CARD Protein Inhibits Apoptosis through Intrinsic and Extrinsic Pathways</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>Grouper iridovirus (GIV) belongs to the genus Ranavirus of the family Iridoviridae; the genomes of such viruses contain an anti-apoptotic caspase recruitment domain (CARD) gene. 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amphibians</subject><subject>Ribonucleic acid</subject><subject>RNA</subject><subject>RNA-mediated interference</subject><subject>Sequence Alignment</subject><subject>Signal transduction</subject><subject>Transcription</subject><subject>Transcriptional Activation - drug effects</subject><subject>Up-Regulation</subject><subject>Vaccines</subject><subject>Viral infections</subject><subject>Viral Proteins - chemistry</subject><subject>Viral Proteins - genetics</subject><subject>Viral Proteins - metabolism</subject><subject>Virology</subject><subject>Viruses</subject><issn>1932-6203</issn><issn>1932-6203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>DOA</sourceid><recordid>eNqNkl1v0zAYhSMEYqPwDxBEQkJw0eKvOPYNUlUGVJq0aQNuLcexG1dp3NnO2P49Lk2nBu0C-cKO_bzHfk9Olr2GYAZxCT-tXe872c62rtMzABEHJXySnUKO0ZQigJ8erU-yFyGsASgwo_R5doIoICXG-DS7Xnpbu1vr-5Av5ldf8kvvorZdvuwaW9kY8vnWbaMLNuSx8a5fNekoetsFq3LZ1fnZ3eHrUsbmt7wPL7NnRrZBvxrmSfbz69mPxffp-cW35WJ-PlWUozitQVnVhpYFrilhClCACeXMgAIZWdWEI4ZZmaZCVcAkTJIKIkMqBiQDCOJJ9navu21dEIMfQUDKKIIFBDQRyz1RO7kWW2830t8LJ634u-H8SkgfrWq1YERBzrXk0pSEFbAiCkGmjTFlelO10_o83NZXG10rnVyQ7Uh0fNLZRqzcrSCkKDnaCXwYBLy76XWIYmOD0m0rO-36_bs55yy1Pcne_YM-3t1ArWRqwHbGpXvVTlTMCaSUJu_KRM0eodKo9caqFB5j0_6o4OOoIDFR38WV7EMQy-ur_2cvfo3Z90dso2Ubm-DaPlrXhTFI9qDyLgSvzYPJEIhd9g9uiF32xZD9VPbm-Ac9FB3Cjv8Aj7v9pQ</recordid><startdate>20150605</startdate><enddate>20150605</enddate><creator>Chen, Chien-Wen</creator><creator>Wu, Ming-Shan</creator><creator>Huang, Yi-Jen</creator><creator>Lin, Pei-Wen</creator><creator>Shih, Chueh-Ju</creator><creator>Lin, Fu-Pang</creator><creator>Chang, Chi-Yao</creator><general>Public Library of Science</general><general>Public Library of Science (PLoS)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>IOV</scope><scope>ISR</scope><scope>3V.</scope><scope>7QG</scope><scope>7QL</scope><scope>7QO</scope><scope>7RV</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TG</scope><scope>7TM</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB.</scope><scope>KB0</scope><scope>KL.</scope><scope>L6V</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>M7S</scope><scope>NAPCQ</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PATMY</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20150605</creationdate><title>Iridovirus CARD Protein Inhibits Apoptosis through Intrinsic and Extrinsic Pathways</title><author>Chen, Chien-Wen ; Wu, Ming-Shan ; Huang, Yi-Jen ; Lin, Pei-Wen ; Shih, Chueh-Ju ; Lin, Fu-Pang ; Chang, Chi-Yao</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c692t-d07bdf6753d648c06034698f052fabd49283874925cb0f753a4b12f4b80a80213</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Amino Acid Sequence</topic><topic>Amino acids</topic><topic>Animals</topic><topic>Aphidicolin</topic><topic>Apoptosis</topic><topic>Base Sequence</topic><topic>Biotechnology</topic><topic>CARD Signaling Adaptor Proteins - chemistry</topic><topic>CARD Signaling Adaptor Proteins - genetics</topic><topic>CARD Signaling Adaptor Proteins - metabolism</topic><topic>Caspase</topic><topic>Caspase 8 - metabolism</topic><topic>Caspase 9 - metabolism</topic><topic>Caspase-8</topic><topic>Cell Line</topic><topic>Cellular biology</topic><topic>Cycloheximide</topic><topic>Cycloheximide - pharmacology</topic><topic>Cytoplasm</topic><topic>Epinephelus awoara</topic><topic>Fisheries</topic><topic>Fishes</topic><topic>Gene expression</topic><topic>Genes</topic><topic>Genes, Viral</topic><topic>Genomes</topic><topic>Genomics</topic><topic>Health aspects</topic><topic>HeLa Cells</topic><topic>Herpes viruses</topic><topic>Humans</topic><topic>Infection</topic><topic>Infections</topic><topic>Inhibition</topic><topic>Iridovirus - genetics</topic><topic>Iridovirus - metabolism</topic><topic>Laboratories</topic><topic>Localization</topic><topic>Mitochondria</topic><topic>Models, Molecular</topic><topic>Molecular chains</topic><topic>Molecular Sequence Data</topic><topic>Nuclei</topic><topic>Nucleotide sequence</topic><topic>Overexpression</topic><topic>Pathways</topic><topic>Perciformes - virology</topic><topic>Protein Synthesis Inhibitors - pharmacology</topic><topic>Proteins</topic><topic>Reptiles &amp; 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the genomes of such viruses contain an anti-apoptotic caspase recruitment domain (CARD) gene. The GIV-CARD gene encodes a protein of 91 amino acids with a molecular mass of 10,505 Daltons, and shows high similarity to other viral CARD genes and human ICEBERG. In this study, we used Northern blot to demonstrate that GIV-CARD transcription begins at 4 h post-infection; furthermore, we report that its transcription is completely inhibited by cycloheximide but not by aphidicolin, indicating that GIV-CARD is an early gene. GIV-CARD-EGFP and GIV-CARD-FLAG recombinant proteins were observed to translocate from the cytoplasm into the nucleus, but no obvious nuclear localization sequence was observed within GIV-CARD. RNA interference-mediated knockdown of GIV-CARD in GK cells infected with GIV inhibited expression of GIV-CARD and five other viral genes during the early stages of infection, and also reduced GIV infection ability. Immunostaining was performed to show that apoptosis was effectively inhibited in cells expressing GIV-CARD. HeLa cells irradiated with UV or treated with anti-Fas antibody will undergo apoptosis through the intrinsic and extrinsic pathways, respectively. However, over-expression of recombinant GIV-CARD protein in HeLa cells inhibited apoptosis induced by mitochondrial and death receptor signaling. Finally, we report that expression of GIV-CARD in HeLa cells significantly reduced the activities of caspase-8 and -9 following apoptosis triggered by anti-Fas antibody. Taken together, these results demonstrate that GIV-CARD inhibits apoptosis through both intrinsic and extrinsic pathways.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>26047333</pmid><doi>10.1371/journal.pone.0129071</doi><oa>free_for_read</oa></addata></record>
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source MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Public Library of Science (PLoS) Journals Open Access; PubMed Central; Free Full-Text Journals in Chemistry
subjects Amino Acid Sequence
Amino acids
Animals
Aphidicolin
Apoptosis
Base Sequence
Biotechnology
CARD Signaling Adaptor Proteins - chemistry
CARD Signaling Adaptor Proteins - genetics
CARD Signaling Adaptor Proteins - metabolism
Caspase
Caspase 8 - metabolism
Caspase 9 - metabolism
Caspase-8
Cell Line
Cellular biology
Cycloheximide
Cycloheximide - pharmacology
Cytoplasm
Epinephelus awoara
Fisheries
Fishes
Gene expression
Genes
Genes, Viral
Genomes
Genomics
Health aspects
HeLa Cells
Herpes viruses
Humans
Infection
Infections
Inhibition
Iridovirus - genetics
Iridovirus - metabolism
Laboratories
Localization
Mitochondria
Models, Molecular
Molecular chains
Molecular Sequence Data
Nuclei
Nucleotide sequence
Overexpression
Pathways
Perciformes - virology
Protein Synthesis Inhibitors - pharmacology
Proteins
Reptiles & amphibians
Ribonucleic acid
RNA
RNA-mediated interference
Sequence Alignment
Signal transduction
Transcription
Transcriptional Activation - drug effects
Up-Regulation
Vaccines
Viral infections
Viral Proteins - chemistry
Viral Proteins - genetics
Viral Proteins - metabolism
Virology
Viruses
title Iridovirus CARD Protein Inhibits Apoptosis through Intrinsic and Extrinsic Pathways
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