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- Title
T-cadherin (Cdh13) in association with pancreatic β-cell granules contributes to second phase insulin secretion.
- Authors
Tyrberg, Björn; Miles, Philip; Azizian, Krist T; Denzel, Martin S; Nieves, Maria L; Monosov, Edward Z; Levine, Fred; Ranscht, Barbara
- Abstract
Glucose homeostasis depends on adequate control of insulin secretion. We report the association of the cell-adhesion and adiponectin (APN)-binding glycoprotein T-cadherin (Cdh13) with insulin granules in mouse and human β-cells. Immunohistochemistry and electron microscopy of islets in situ and targeting of RFP-tagged T-cadherin to GFP-labeled insulin granules in isolated β-cells demonstrate this unusual location. Analyses of T-cadherin-deficient (Tcad-KO) mice show normal islet architecture and insulin content. However, T-cadherin is required for sufficient insulin release in vitro and in vivo. Primary islets from Tcad-KO mice were defective in glucose-induced but not KCl-mediated insulin secretion. In vivo, second phase insulin release in T-cad-KO mice during a hyperglycemic clamp was impaired while acute first phase release was unaffected. Tcad-KO mice showed progressive glucose intolerance by 5 mo of age without concomitant changes in peripheral insulin sensitivity. Our analyses detected no association of APN with T-cadherin on β-cell granules although colocalization was observed on the pancreatic vasculature. These data identify T-cadherin as a novel component of insulin granules and suggest that T-cadherin contributes to the regulation of insulin secretion independently of direct interactions with APN.
- Publication
Islets, 2011, Vol 3, Issue 6, p327
- ISSN
1938-2022
- Publication type
Journal Article
- DOI
10.4161/isl.3.6.17705