Nkx6.1 REGULATION OF ISLET BIOLOGY

在本项目资助（PPG）的前五年，我们的实验室一直在应用跨学科的方法来定义糖尿病和肥胖症中肝脏、胰岛β细胞和骨骼肌的代谢异常。在同一时期，PPG团队的其他成员开发了功能成像、基因靶向递送和其他分子货物以及定制基因激活开关的技术。PPG团队取得的最引人注目的进展发生在胰岛生物学和相关技术领域。

Over the first five years of funding of this program project grant (PPG), our laboratory has been applying an interdisciplinary approach for defining metabolic abnormalities of liver, pancreatic islet beta-cells, and skeletal muscle in diabetes and obesity. Over the same time period, other members of this PPG team have developed technologies for functional imaging, targeted delivery of genes and other molecular cargo, and customized gene activation switches. The most compelling advances made by the PPG team have occurred in the area of pancreatic islet biology and related technologies. We have therefore chosen to focus the competitive renewal of this application on development of new strategies for understanding and reversing beta-cell dysfunction of type 2 diabetes. The goal of this project (Project 1) is to investigate and validate novel pathways for control of beta-cell function and growth that have emerged from our work in the prior funding period. The project will make extensive use of extraordinary technologies resident in Core B for beta-cell specific gene delivery in adult animals, and in Core C for comprehensive MS- and NMR-based metabolic analysis of islets and beta-cell lines. The specific aims of the project are: 1) To investigate mechanisms by which manipulation of the homeodomain transcription factor Nkx6.1 and its target genes affect glucose-stimulated insulin secretion (GSIS) in pancreatic islets; 2) To investigate mechanisms by which manipulation of the homeodomain transcription factor Nkx6.1 and its target genes affect pancreatic islet growth; 3) To test the potential protective or restorative effect of Nkx6.1 and its target genes in preservation of beta-cell mass and function in cellular and animal models of type 2 diabetes.