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Originally published In Press as doi:10.1074/jbc.M209423200 on October 29, 2002

J. Biol. Chem., Vol. 278, Issue 1, 471-478, January 3, 2003
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Glucagon-like Peptide-1 Receptor Signaling Modulates beta  Cell Apoptosis*

Yazhou LiDagger §, Tanya HansotiaDagger §||, Bernardo YustaDagger , Frederic Ris**, Philippe A. Halban**, and Daniel J. DruckerDagger Dagger

From the Dagger  Department of Medicine, Banting and Best Diabetes Centre, Toronto General Hospital, University of Toronto, Ontario M5G 2C4, Canada, and the ** Louis-Jeantet Research Laboratories, University Medical Centre, 1211 Geneva 4, Switzerland

Glucagon-like peptide-1 (GLP-1) stimulates insulin secretion and augments beta  cell mass via activation of beta  cell proliferation and islet neogenesis. We examined whether GLP-1 receptor signaling modifies the cellular susceptibility to apoptosis. Mice administered streptozotocin (STZ), an agent known to induce beta  cell apoptosis, exhibit sustained improvement in glycemic control and increased levels of plasma insulin with concomitant administration of the GLP-1 agonist exendin-4 (Ex-4). Blood glucose remained significantly lower for weeks after cessation of exendin-4. STZ induced beta  cell apoptosis, which was significantly reduced by co-administration of Ex-4. Conversely, mice with a targeted disruption of the GLP-1 receptor gene exhibited increased beta  cell apoptosis after STZ administration. Exendin-4 directly reduced cytokine-induced apoptosis in purified rat beta  cells exposed to interleukin 1beta , tumor necrosis fator alpha , and interferon gamma  in vitro. Furthermore, Ex-4-treated BHK-GLP-1R cells exhibited significantly increased cell viability, reduced caspase activity, and decreased cleavage of beta -catenin after treatment with cycloheximide in vitro. These findings demonstrate that GLP-1 receptor signaling directly modifies the susceptibility to apoptotic injury, and provides a new potential mechanism linking GLP-1 receptor activation to preservation or enhancement of beta  cell mass in vivo.


* This work was partially supported by grants from the Juvenile Diabetes Research Foundation (JDRF 2000-559 to D. J. D. and JDRF 4-1999-844 to P. A. H.), the Canadian Diabetes Association and Ontario Research and Development Challenge Fund (to D. J. D.), and by the Swiss National Science Foundation (Grant 3200-061776.00 to P. A. H.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

§ These authors contributed equally to this work.

Supported by a postdoctoral fellowship Award from the Canadian Diabetes Association.

|| Supported by a Novo Nordisk-Banting and Best Diabetes Centre studentship.

Dagger Dagger Supported by a Senior Scientist Award (Canadian Institutes of Health Research). To whom correspondence should be addressed: Toronto General Hospital, 200 Elizabeth St. MBRW4R-402, Toronto, Ontario M5G 2C4, Canada. Tel.:416-340-4125; Fax: 416-978-4108; E-mail: d.drucker@utoronto.ca.


Copyright © 2003 by The American Society for Biochemistry and Molecular Biology, Inc.
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