Symptomatic cardiovascular disease in patients with metabolic syndrome (insulin resistance, dyslipidemia and hypertension) is an exploding public health concern and a significant clinical problem because these patients do not tolerate injury well. Metabolic syndrome results in a high glucose, free fatty rich environment in the body's tissues and understanding the influence of injury and metabolic syndrome on tissue responses will allow for focused changes in current therapeutic strategies. The phospholipid, Sphingosine-1 -phosphate (S-1-P) is released from platelets at sites of injury and is a potent mediator of cell migration, a hallmark of any remodeling process. Cell migration is a complex, but highly regulated process of cyclical attachment, detachment and contraction accompanied by alterations in metalloproteinase (MMP) and tissue inhibitors of MMP (TIMP) expression and activity that allow cells to move from the media through the extracellular matrix. Changes in MMPs, TIMPs, integrins and extracellular matrix constitute the proteolytic thermostat of a tissue. The goal of this program is to define the role of metabolic syndrome on the response to vascular injury with a particular focus on phospholipid signaling and define therapeutic options that will ameliorate its accelerant effects on the injury response. In the present proposal, we will test the hypothesis that S-1-P induced smooth muscle cell migration is enhanced in metabolic syndrome by redox-dependent regulation of the proteolytic thermostat. We will focus on the regulation of the MMP-2 pathway in a high glucose, free fatty acid rich environment in vitro and in vivo and plan: 1/ To examine the regulation of S-1-P mediated NAD(P)H oxidase activity;21 To determine the regulation the MMP-2 pathway by S-1-P;3/ To determine the role of the proteolytic thermostat in human vascular smooth muscle cells;4/ To evaluate the proteolytic thermostat in a vessel's response to injury and remodeling. This proposal examines two important components pf vessel remodeling, namely cell migration and the proteolytic thermostat. It is unique in that it addresses S-1-P signal transduction and protease activation in models of metabolic syndrome. By the end of this proposal, the role of smooth muscle cell migration in vitro and in vivo in metabolic syndrome will have been better defined. This will have direct clinical relevance to the biology of vascular injury after percutaneous intervention in patients with metabolic syndrome and will help guide therapy.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL086968-05
Application #
8105511
Study Section
Surgery, Anesthesiology and Trauma Study Section (SAT)
Program Officer
Mcdonald, Cheryl
Project Start
2007-09-15
Project End
2014-06-30
Budget Start
2011-07-01
Budget End
2014-06-30
Support Year
5
Fiscal Year
2011
Total Cost
$375,000
Indirect Cost
Name
Methodist Hospital Research Institute
Department
Type
DUNS #
185641052
City
Houston
State
TX
Country
United States
Zip Code
77030
Duru, Enrico A; Fu, Yuyang; Davies, Mark G (2015) Role of formic receptors in soluble urokinase receptor-induced human vascular smooth muscle migration. J Surg Res 195:396-405
Duru, Enrico A; Fu, Yuyang; Davies, Mark G (2014) Protease-mediated human smooth muscle cell proliferation by urokinase requires epidermal growth factor receptor transactivation by triple membrane signaling. J Surg Res 192:254-62
Fu, Yuyang; Duru, Enrico A; Davies, Mark G (2014) Effect of metabolic syndrome on the response to arterial injury. J Surg Res 191:33-41
Duru, Enrico A; Fu, Yuyang; Davies, Mark G (2012) Role of S-1-P receptors and human vascular smooth muscle cell migration in diabetes and metabolic syndrome. J Surg Res 177:e75-82
Zou, Yiping; Fu, Yuyang; Davies, Mark G (2012) Role for Gýýýý G-proteins in protease regulation during remodeling of the murine femoral artery. J Surg Res 178:40-7
Duru, Enrico A; Fu, Yuyang; Davies, Mark G (2012) Urokinase requires NAD(P)H oxidase to transactivate the epidermal growth factor receptor. Surgery 152:879-85
Zou, Yiping; Fu, Yuyang; Davies, Mark G (2012) Gýýq G proteins modulate MMP-9 gelatinase during remodeling of the murine femoral artery. J Surg Res :
Duru, Enrico A; Fu, Yuyang; Davies, Mark G (2012) SRC regulates sphingosine-1-phosphate mediated smooth muscle cell migration. J Surg Res 175:30-4
Vykoukal, Daynene; Davies, Mark G (2012) Biology of metabolic syndrome in a vascular patient. Vascular 20:156-65
Vykoukal, Daynene; Davies, Mark G (2011) Vascular biology of metabolic syndrome. J Vasc Surg 54:819-31

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