Pancreatic islet function in a transgenic mouse expressing fluorescent protein.

Area of Science:

• Biomedical Research
• Genetics and Genomics
• Endocrinology

Background:

• Pancreatic islet function is crucial for glucose homeostasis.
• Transgenic mouse models are essential for studying complex biological processes.
• Characterizing novel reporter systems aids in understanding gene expression in specific cell types.

Purpose of the Study:

• To characterize pancreatic islet function and glucose homeostasis in the YC-3.0 transgenic mouse.
• To evaluate the YC-3.0 mouse as a model for islet engraftment studies.
• To assess the safety and efficacy of the YC-3.0 transgene expression.

Main Methods:

• Generation of YC-3.0 transgenic mice using beta-actin and CMV promoters.
• Monitoring enhanced yellow fluorescent protein (EYFP) expression as a transgene reporter.
• Assessment of in vivo glucose homeostasis, blood pressure, and blood flow.
• Evaluation of beta-cell mass and glucose-stimulated insulin release in vitro.
• Transplantation of YC-3.0 islets into alloxan-diabetic nude mice.

Main Results:

• YC-3.0 mice exhibited normal islet function, glucose homeostasis, and no adverse effects from transgene expression.
• EYFP was expressed in various cell types, including islet endocrine and stromal cells.
• Transplanted YC-3.0 islets successfully reversed hyperglycemia in diabetic recipients.
• Beta-cell volume, mass, and insulin secretion were comparable to control mice.

Conclusions:

• The YC-3.0 transgenic mouse is a safe and effective model for studying pancreatic islet function.
• The continuous transgene expression in YC-3.0 islets supports their utility in engraftment research.
• This model provides a novel and versatile platform for investigating islet transplantation and diabetes.