Peripheral arterial disease (PAD) is a major complication of diabetes and is a leading cause of amputations of digits or limbs. My laboratory has focused for the past 15 years on the molecular regulation of genes in hypoxic stress. In the previous cycle, three major discoveries linked RAGE to regulation of acute responses to hypoxia: First, in cultured endothelial cells and monocytes/macrophages, acute exposure to hypoxia resulted in rapid release of AGE-reactive epitopes within minutes of hypoxic stress. Second, in the intact heart and in primary murine aortic and human aoilic endothelial cells, RAGE regulated rapid upregulation of Egr-1 in a manner suppressed by deletion or knockdown of RAGE and by aminoguanidine, an AGE inhibitor. Third, in collaboration with Project 1, we showed that monocytes/macrophages devoid of RAGE orthe RAGE cytoplasmic domain binding partner, diaphanous-1 or mDia-1, did not upregulate Egr-1 in acute hypoxia. To address the diabetes-relevant implications of these findings, we employed an in vivo model of hind limb ischemia induced by unilateral femoral artery ligation. Diabetes significantly impairs vascular repair mechanisms in this model. Our preliminary data reveal a fascinating and unexpected switch in RAGE signaling in acute vs. chronic oxygen deprivation ... whereas RAGE signaling upregulates Egr-1 in acute hypoxia, in hind limb ischemia, particularly in diabetes, RAGE suppresses adaptive induction of Egr-1 and, in parallel, reduces angiogenesis and blood flow recovery. In this application, we will probe the effects of specific deletion of RAGE in either monocytes/macrophages or endothelial cells to dissect the mechanisms by which RAGE action suppresses angiogenesis and blood flow recovery. Together with Projects 1&3, we will discern the fine-tuning mechanisms by which RAGE acts in common cardiovascular stresses, as all three Projects will use Affymetrix arrays to develop an integrated picture of RAGE signaling in distinct cell types and situations. We will use all three Cores in all five years ofthe Program.

Public Health Relevance

Peripheral arterial disease is associated with increased morbidity and mortality, particularly in subjects with diabetes. This Project focuses on the Receptor for Advanced Glycation Endproducts (RAGE) and its biology in this disorder. Understanding the role of RAGE in the vascular and inflammatory response to peripheral arterial disease is essential for the design of new therapies for diabetic vascular disease.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Program Projects (P01)
Project #
4P01HL060901-14
Application #
8976279
Study Section
Special Emphasis Panel (ZHL1)
Project Start
Project End
Budget Start
2015-12-01
Budget End
2016-11-30
Support Year
14
Fiscal Year
2016
Total Cost
Indirect Cost
Name
New York University
Department
Type
DUNS #
121911077
City
New York
State
NY
Country
United States
Zip Code
10016
Schmidt, Ann Marie (2018) Highlighting Diabetes Mellitus: The Epidemic Continues. Arterioscler Thromb Vasc Biol 38:e1-e8
Lee, Gloria; Plaksin, Joseph; Ramasamy, Ravichandran et al. (2018) Targeted drug discovery and development, from molecular signaling to the global market: an educational program at New York University, 5-year metrics. J Transl Sci 4:1-9
Lee, Gloria; Kranzler, Jay D; Ramasamy, Ravichandran et al. (2018) Training scientists as future industry leaders: teaching translational science from an industry executive's perspective. J Transl Sci 4:
Schmidt, Ann Marie (2017) 2016ATVBPlenary Lecture: Receptor for Advanced Glycation Endproducts and Implications for the Pathogenesis an Treatment of Cardiometabolic Disorders: Spotlight on the Macrophage. Arterioscler Thromb Vasc Biol 37:613-621
López-Díez, Raquel; Shen, Xiaoping; Daffu, Gurdip et al. (2017) Ager Deletion Enhances Ischemic Muscle Inflammation, Angiogenesis, and Blood Flow Recovery in Diabetic Mice. Arterioscler Thromb Vasc Biol 37:1536-1547
Shekhtman, Alexander; Ramasamy, Ravichandran; Schmidt, Ann Marie (2017) Glycation & the RAGE axis: targeting signal transduction through DIAPH1. Expert Rev Proteomics 14:147-156
Senatus, Laura M; Schmidt, Ann Marie (2017) The AGE-RAGE Axis: Implications for Age-Associated Arterial Diseases. Front Genet 8:187
López-Díez, Raquel; Shekhtman, Alexander; Ramasamy, Ravichandran et al. (2016) Cellular mechanisms and consequences of glycation in atherosclerosis and obesity. Biochim Biophys Acta 1862:2244-2252
Thiagarajan, Devi; Vedantham, Srinivasan; Ananthakrishnan, Radha et al. (2016) Mechanisms of transcription factor acetylation and consequences in hearts. Biochim Biophys Acta 1862:2221-2231
Manigrasso, Michaele B; Pan, Jinhong; Rai, Vivek et al. (2016) Small Molecule Inhibition of Ligand-Stimulated RAGE-DIAPH1 Signal Transduction. Sci Rep 6:22450

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