Ubiquitin C-terminal hydrolase L1 is required for pancreatic beta cell survival and function in lipotoxic conditions
Identifieur interne : 001486 ( Main/Exploration ); précédent : 001485; suivant : 001487Ubiquitin C-terminal hydrolase L1 is required for pancreatic beta cell survival and function in lipotoxic conditions
Auteurs : K. Y. Chu [Canada] ; H. Li [Canada] ; K. Wada [Japon] ; J. D. Johnson [Canada]Source :
- Diabetologia : (Berlin) [ 0012-186X ] ; 2012.
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- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Aims/hypothesis Ubiquitin C-terminal hydrolase L1 (UCHL1) is associated with neurodegenerative diseases and has been suggested to have roles in pancreatic beta cells. Our proteomic analysis revealed that UCHL 1 was the most increased protein in MIN6 cells exposed to palmitate. The present study used a genetic loss-of-function model to test the hypothesis that UCHL1 is required for normal beta cell function and fate under lipotoxic conditions. Methods Human islets, mouse islets and MIN6 cells were used to analyse UCHL1 protein levels and regulation of UCHL1 by palmitate. The levels of free mono-ubiquitin and poly-ubiquitinated proteins were assessed. Gracile axonal dystrophy (GAD) mutant mice lacking UCHL1 were fed a normal or lipotoxic high-fat diet. Glucose tolerance, insulin tolerance and insulin secretion were assessed in vivo. Beta cell death and proliferation were assessed by TUNEL and proliferating cell nuclear antigen (PCNA) staining. Insulin secretion, calcium signalling, endoplasmic reticulum (ER) stress, apoptosis and SNARE protein levels were assessed in vitro. Results UCHL1 protein, which was highly specific to beta cells, was increased by palmitate at basal glucose, but not in the context of hyperglycaemia associated with frank diabetes. Although islet development and function were initially normal in Uchl1-/- mice, a 4-week high-fat diet caused glucose intolerance and impaired insulin secretion. Uchl1-/- mice had increased ER stress and beta cell apoptosis. The levels of SNARE proteins were dysregulated in Uchl1-/- islets. Palmitate-stimulated vesicle-associated membrane protein 2 (VAMP2) ubiquitination was modulated by a chemical UCHL1 inhibitor. Conclusions/interpretation Together, these data suggest that UCHL1 has essential functional and anti-apoptotic roles in beta cells under stress conditions associated with lipotoxicity.
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Li</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory of Molecular Signaling in Diabetes, Diabetes Research Group, Department of Cellular and Physiological Sciences, University of British Columbia, 5358 Life Sciences Building, 2350 Health Sciences Mall</s1><s2>Vancouver, BC V6T 1Z3</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Vancouver, BC V6T 1Z3</wicri:noRegion></affiliation></author><author><name sortKey="Wada, K" sort="Wada, K" uniqKey="Wada K" first="K." last="Wada">K. Wada</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry Kodaira</s1><s2>Tokyo</s2><s3>JPN</s3><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Johnson, J D" sort="Johnson, J D" uniqKey="Johnson J" first="J. D." last="Johnson">J. D. 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Y." last="Chu">K. Y. Chu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory of Molecular Signaling in Diabetes, Diabetes Research Group, Department of Cellular and Physiological Sciences, University of British Columbia, 5358 Life Sciences Building, 2350 Health Sciences Mall</s1><s2>Vancouver, BC V6T 1Z3</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Vancouver, BC V6T 1Z3</wicri:noRegion></affiliation></author><author><name sortKey="Li, H" sort="Li, H" uniqKey="Li H" first="H." last="Li">H. Li</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory of Molecular Signaling in Diabetes, Diabetes Research Group, Department of Cellular and Physiological Sciences, University of British Columbia, 5358 Life Sciences Building, 2350 Health Sciences Mall</s1><s2>Vancouver, BC V6T 1Z3</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Vancouver, BC V6T 1Z3</wicri:noRegion></affiliation></author><author><name sortKey="Wada, K" sort="Wada, K" uniqKey="Wada K" first="K." last="Wada">K. Wada</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry Kodaira</s1><s2>Tokyo</s2><s3>JPN</s3><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Johnson, J D" sort="Johnson, J D" uniqKey="Johnson J" first="J. D." last="Johnson">J. D. Johnson</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory of Molecular Signaling in Diabetes, Diabetes Research Group, Department of Cellular and Physiological Sciences, University of British Columbia, 5358 Life Sciences Building, 2350 Health Sciences Mall</s1><s2>Vancouver, BC V6T 1Z3</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Vancouver, BC V6T 1Z3</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Diabetologia : (Berlin)</title><title level="j" type="abbreviated">Diabetologia : (Berl.)</title><idno type="ISSN">0012-186X</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Diabetologia : (Berlin)</title><title level="j" type="abbreviated">Diabetologia : (Berl.)</title><idno type="ISSN">0012-186X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Apoptosis</term><term>Hydrolases</term><term>Parkinson disease</term><term>Survival</term><term>Type 2 diabetes</term><term>Ubiquitin</term><term>β Cell</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Ubiquitine</term><term>Hydrolases</term><term>Cellule β</term><term>Survie</term><term>Apoptose</term><term>Maladie de Parkinson</term><term>Diabète de type 2</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Aims/hypothesis Ubiquitin C-terminal hydrolase L1 (UCHL1) is associated with neurodegenerative diseases and has been suggested to have roles in pancreatic beta cells. Our proteomic analysis revealed that UCHL 1 was the most increased protein in MIN6 cells exposed to palmitate. The present study used a genetic loss-of-function model to test the hypothesis that UCHL1 is required for normal beta cell function and fate under lipotoxic conditions. Methods Human islets, mouse islets and MIN6 cells were used to analyse UCHL1 protein levels and regulation of UCHL1 by palmitate. The levels of free mono-ubiquitin and poly-ubiquitinated proteins were assessed. Gracile axonal dystrophy (GAD) mutant mice lacking UCHL1 were fed a normal or lipotoxic high-fat diet. Glucose tolerance, insulin tolerance and insulin secretion were assessed in vivo. Beta cell death and proliferation were assessed by TUNEL and proliferating cell nuclear antigen (PCNA) staining. Insulin secretion, calcium signalling, endoplasmic reticulum (ER) stress, apoptosis and SNARE protein levels were assessed in vitro. Results UCHL1 protein, which was highly specific to beta cells, was increased by palmitate at basal glucose, but not in the context of hyperglycaemia associated with frank diabetes. Although islet development and function were initially normal in Uchl1<sup>-/-</sup> mice, a 4-week high-fat diet caused glucose intolerance and impaired insulin secretion. Uchl1<sup>-/-</sup> mice had increased ER stress and beta cell apoptosis. The levels of SNARE proteins were dysregulated in Uchl1<sup>-/-</sup> islets. Palmitate-stimulated vesicle-associated membrane protein 2 (VAMP2) ubiquitination was modulated by a chemical UCHL1 inhibitor. Conclusions/interpretation Together, these data suggest that UCHL1 has essential functional and anti-apoptotic roles in beta cells under stress conditions associated with lipotoxicity.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Japon</li></country><settlement><li>Tokyo</li></settlement></list><tree><country name="Canada"><noRegion><name sortKey="Chu, K Y" sort="Chu, K Y" uniqKey="Chu K" first="K. Y." last="Chu">K. Y. Chu</name></noRegion><name sortKey="Johnson, J D" sort="Johnson, J D" uniqKey="Johnson J" first="J. D." last="Johnson">J. D. Johnson</name><name sortKey="Li, H" sort="Li, H" uniqKey="Li H" first="H." last="Li">H. Li</name></country><country name="Japon"><noRegion><name sortKey="Wada, K" sort="Wada, K" uniqKey="Wada K" first="K." last="Wada">K. Wada</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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