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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
Glucagon-like Peptide-1 Receptor Signaling Modulates Cell
Apoptosis*
Yazhou
Li §¶,
Tanya
Hansotia § ,
Bernardo
Yusta ,
Frederic
Ris**,
Philippe A.
Halban**, and
Daniel J.
Drucker
From the 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 cell mass via activation of 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 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
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 cell apoptosis after
STZ administration. Exendin-4 directly reduced cytokine-induced
apoptosis in purified rat cells exposed to interleukin 1 , tumor
necrosis fator , and interferon in vitro.
Furthermore, Ex-4-treated BHK-GLP-1R cells exhibited significantly
increased cell viability, reduced caspase activity, and decreased
cleavage of -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 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.

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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N. Ogawa, J. F. List, J. F. Habener, and T. Maki
Cure of Overt Diabetes in NOD Mice by Transient Treatment With Anti-Lymphocyte Serum and Exendin-4
Diabetes,
July 1, 2004;
53(7):
1700 - 1705.
[Abstract]
[Full Text]
[PDF]
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D.-Q. Tang, L.-Z. Cao, B. R. Burkhardt, C.-Q. Xia, S. A. Litherland, M. A. Atkinson, and L.-J. Yang
In Vivo and In Vitro Characterization of Insulin-Producing Cells Obtained From Murine Bone Marrow
Diabetes,
July 1, 2004;
53(7):
1721 - 1732.
[Abstract]
[Full Text]
[PDF]
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J. F. List and J. F. Habener
Glucagon-like peptide 1 agonists and the development and growth of pancreatic {beta}-cells
Am J Physiol Endocrinol Metab,
June 1, 2004;
286(6):
E875 - E881.
[Abstract]
[Full Text]
[PDF]
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D. A. D'Alessio and T. P. Vahl
Glucagon-like peptide 1: evolution of an incretin into a treatment for diabetes
Am J Physiol Endocrinol Metab,
June 1, 2004;
286(6):
E882 - E890.
[Abstract]
[Full Text]
[PDF]
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P. L. Brubaker and D. J. Drucker
Minireview: Glucagon-Like Peptides Regulate Cell Proliferation and Apoptosis in the Pancreas, Gut, and Central Nervous System
Endocrinology,
June 1, 2004;
145(6):
2653 - 2659.
[Abstract]
[Full Text]
[PDF]
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T. Hansotia, L. L. Baggio, D. Delmeire, S. A. Hinke, Y. Yamada, K. Tsukiyama, Y. Seino, J. J. Holst, F. Schuit, and D.J. Drucker
Double Incretin Receptor Knockout (DIRKO) Mice Reveal an Essential Role for the Enteroinsular Axis in Transducing the Glucoregulatory Actions of DPP-IV Inhibitors
Diabetes,
May 1, 2004;
53(5):
1326 - 1335.
[Abstract]
[Full Text]
[PDF]
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D. M. Harlan
Gene-Altered Islets for Transplant: Giant Leap or Small Step?
Endocrinology,
February 1, 2004;
145(2):
463 - 466.
[Full Text]
[PDF]
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D. J. Drucker
Glucagon-Like Peptide-1 and the Islet {beta}-Cell: Augmentation of Cell Proliferation and Inhibition of Apoptosis
Endocrinology,
December 1, 2003;
144(12):
5145 - 5148.
[Full Text]
[PDF]
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L. Farilla, A. Bulotta, B. Hirshberg, S. Li Calzi, N. Khoury, H. Noushmehr, C. Bertolotto, U. Di Mario, D. M. Harlan, and R. Perfetti
Glucagon-Like Peptide 1 Inhibits Cell Apoptosis and Improves Glucose Responsiveness of Freshly Isolated Human Islets
Endocrinology,
December 1, 2003;
144(12):
5149 - 5158.
[Abstract]
[Full Text]
[PDF]
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D. J. Drucker
Enhancing Incretin Action for the Treatment of Type 2 Diabetes
Diabetes Care,
October 1, 2003;
26(10):
2929 - 2940.
[Abstract]
[Full Text]
[PDF]
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K. E. Mayo, L. J. Miller, D. Bataille, S. Dalle, B. Goke, B. Thorens, and D. J. Drucker
International Union of Pharmacology. XXXV. The Glucagon Receptor Family
Pharmacol. Rev.,
March 1, 2003;
55(1):
167 - 194.
[Abstract]
[Full Text]
[PDF]
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Copyright © 2003 by the American Society for Biochemistry and Molecular Biology.
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