The epidemic of obesity is causing a sharp rise in the incidence of insulin resistance and its major complication, atherosclerotic cardiovascular disease (CVD). Thus, there is great interest in understanding the role of insulin resistance in both hepatic dyslipidemia, which triggers and maintains atherosclerosis, and in atherogenic events occurring in the plaque cells themselves. The proposed PPG will bring together experts in these different areas working towards a common goal and with a proven record of success over the last 5 years of funding. The overall theme of the PPG is to elucidate novel signal transduction pathways in the liver and in lesional macrophages (Mfs) and endothelial cells (ECs) that contribute to the dyslipidemia and accelerated atherosclerotic lesion progression in insulin-resistant states. In Project 1, Dr. Tabas will focus on the enzyme CaMKII, which has a critical role in (a) both basal and insulin resistance-exacerbated apoptosis of endoplasmic reticulum (ER)-stressed Mfs, which leads to plaque necrosis;and (b) in hepatic derived metabolic disturbances, including dyslipidemia and alterations in FoxO signaling, in obesity and insulin resistance. In Project 2, Dr. Tall will investigate the cellular-molecular mechanisms of hepatic-derived dyslipidemia in insulin resistance, with, emphasis on a novel mTORC1-Sortilin1 pathway that is relevant to recent human genetic studies and, as recent data shows, linked to ER stress and CaMKII. In Project 3, Dr. Accili will focus on vascular ECs as a key site of interaction between insulin resistance and hyperglycemia in atherosclerosis. The emphasis will be on how insulin resistance and hyperglycemia signal through the FoxO proteins to promote atherogenic processes in ECs. Each project will be supported by the Lesion Analysis/Biostatistics Core, in which Dr. Welch's team will provide assistance and expertise in atherosclerosis assays and in biomathematics. The common sub-themes among the projects include: (a) molecules and pathways involved in pro-atherogenic lesional cell dysfunction (Mfs, ECs), including FoxO's, ER stress, CaMKII, mTORC1 (all 3 projects);(b) pathways involved insulin resistance-induced dyslipidemia, including FoxO's, ER stress, mTORC1, Sortilin1, and CaMKII (Projects 1 and 2 in collaboration with Dr. Accili);and (c) mouse models of atherosclerotic lesion development and advanced plaque progression/plaque necrosis (all 3 projects and Core A). The synergistic and highly interactive nature of these projects and the complementary expertise in atherosclerosis and diabetes will enable a unique opportunity to address the emerging epidemic of insulin resistance-associated heart disease.
The most important emerging force behind the leading cause of death world-wide, CVD, is rapidly becoming the epidemic of obesity and insulin resistance. Thus, the future of CVD research and its ultimate goal to develop therapies to lessen the incidence of CVD must place major effort into understanding the cellular and molecular mechanisms linking insulin resistance to CVD, which is the overall goal of this PPG.
|Nagareddy, Prabhakara R; Kraakman, Michael; Masters, Seth L et al. (2014) Adipose tissue macrophages promote myelopoiesis and monocytosis in obesity. Cell Metab 19:821-35|
|Ozcan, Lale; Tabas, Ira (2014) CaMKII in cardiometabolic disease. Aging (Albany NY) 6:430-1|
|Fredman, Gabrielle; Ozcan, Lale; Tabas, Ira (2014) Common therapeutic targets in cardiometabolic disease. Sci Transl Med 6:239ps5|
|Ai, Ding; Jiang, Hongfeng; Westerterp, Marit et al. (2014) Disruption of mammalian target of rapamycin complex 1 in macrophages decreases chemokine gene expression and atherosclerosis. Circ Res 114:1576-84|
|Libby, Peter; Tabas, Ira; Fredman, Gabrielle et al. (2014) Inflammation and its resolution as determinants of acute coronary syndromes. Circ Res 114:1867-79|
|Richards, M Rachel; Black, Audrey S; Bonnet, David J et al. (2013) The LPS2 mutation in TRIF is atheroprotective in hyperlipidemic low density lipoprotein receptor knockout mice. Innate Immun 19:20-9|
|Ozcan, Lale; Cristina de Souza, Jane; Harari, Alp Avi et al. (2013) Activation of calcium/calmodulin-dependent protein kinase II in obesity mediates suppression of hepatic insulin signaling. Cell Metab 18:803-15|
|Nagareddy, Prabhakara R; Murphy, Andrew J; Stirzaker, Roslynn A et al. (2013) Hyperglycemia promotes myelopoiesis and impairs the resolution of atherosclerosis. Cell Metab 17:695-708|
|Murphy, Andrew J; Funt, Samuel; Gorman, Darren et al. (2013) Pegylation of high-density lipoprotein decreases plasma clearance and enhances antiatherogenic activity. Circ Res 113:e1-9|
|Tsuchiya, Kyoichiro; Accili, Domenico (2013) Liver sinusoidal endothelial cells link hyperinsulinemia to hepatic insulin resistance. Diabetes 62:1478-89|
Showing the most recent 10 out of 52 publications