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Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets

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Conditional β1-integrin-deficient mice display impaired pancreatic β cell function.

M Riopel¹, M Krishnamurthy, J Li

¹Children's Health Research Institute, University of Western Ontario, London, ON, Canada.

The Journal of Pathology

|March 8, 2011

Summary

Beta-1 integrin (β1-integrin) deficiency impairs glucose metabolism and reduces beta cell mass and function in vivo. This study reveals β1-integrin

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Last Updated: Jun 3, 2026

Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets

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Surgical Injury to the Mouse Pancreas through Ligation of the Pancreatic Duct as a Model for Endocrine and Exocrine Reprogramming and Proliferation

Surgical Injury to the Mouse Pancreas through Ligation of the Pancreatic Duct as a Model for Endocrine and Exocrine Reprogramming and Proliferation

Published on: August 7, 2015

Area of Science:

Endocrinology
Cell Biology
Integrin Signaling

Background:

Beta-1 integrin (β1-integrin) is vital for beta cell survival and function in vitro.
Its role in vivo, particularly in collagen I-producing cells, remains unclear.

Purpose of the Study:

To investigate the physiological and functional impact of β1-integrin knockout in collagen I-producing cells on pancreatic endocrine cells in vivo.
To elucidate the signaling pathways involved in β1-integrin's regulation of glucose metabolism and beta cell function.

Main Methods:

Conditional knockout of β1-integrin in collagen I-producing cells in adult mice.
Assessment of glucose tolerance, pancreatic insulin content, beta cell mass, proliferation, and gene expression (Pdx-1, Nkx6.1).
Analysis of key signaling pathway components including FAK, ERK1/2, Akt, cyclin D1, and caspase 3.

Main Results:

Male β1-integrin-deficient mice exhibited impaired glucose tolerance and reduced insulin content.
Significant decrease in beta cell mass, proliferation, Pdx-1, and Nkx6.1 expression observed in deficient mice.
β1-integrin deficiency led to reduced FAK and ERK1/2 phosphorylation, decreased cyclin D1, and increased caspase 3 cleavage, indicating FAK-MAPK-ERK pathway involvement.

Conclusions:

Beta-1 integrin plays a crucial role in regulating glucose metabolism and maintaining beta cell survival and function in vivo.
The β1-integrin signaling pathway, specifically through FAK-MAPK-ERK, is critical for these processes.
Sex-dependent differences in the physiological impact of β1-integrin deficiency were noted.