Diabetes is associated with changes in vascular permeability and vasomotor control as well as with increased morbidity and mortality after surgical procedures. This is especially true after heart operations involving cardiopulmonary bypass (CPB). Recently, we have demonstrated that permeability-modulating proteins such as vascular endothelial growth factor /vascular permeability factor (VEGF/VPF) are increased in expression in diabetes and are associated with increased edema formation and length of hospital stay in diabetic patients. Since alterations in vasomotor regulation are critical aspects of morbidity of CPB, a better understanding of the regulation of the microvasculature of diabetic patients may lead to improved outcomes in diabetic patients. The goal of the proposed research is to determine the effect of well-controlled and poorly controlled diabetes mellitus on alterations in signal transduction associated with vascular function and to investigate the changes that occur in patients undergoing heart surgery. Specifically, we will determine the roles of tyrosyl kinase / phosphatase activities, protein tyrosyl phosphorylation, mitogen activated protein kinase (MAPK), and expression of inducible cyclooxygenase (COX-2) in mediating acute changes systemic microvascular reactivity and permeability during clinical cardiac surgery. Protein phosphorylation plays a critical role in numerous vascular processes including vasomotor regulation and the regulation of vascular permeability mediated through adherens junctions and other endothelial cell-cell contacts. In addition, agonist induced microvascular smooth muscle responses to serotonin, endothelin-1 and thromboxane A2 will be examined after cardioplegia in the coronary microcirculation in well controlled, poorly controlled diabetic patients and age-matched non- diabetic patients. Recently, poly(ADP-ribose) polymerase (PARP) has been demonstrated to cause endothelial dysfunction and other vascular injury in diabetic patients. Thus, we will examine the changes in nitrosative stress, PARP activation and apoptosis inducing factor (AIF) translocation after CPB in vessels obtained from diabetic patients, and age-matched non-diabetic patients. This work will be accomplished through an exhaustive approach using molecular and cellular biology techniques to examine the protein phosphorylation and gene expressions involved in maintaining vascular integrity in clinical cardiac surgery involving cardioplegia and CPB. Importantly, we will use cDNA microarray technology and standard molecular and cellular techniques to examine upregulated and downregulated genes and enzymes in diabetic patients and correlate the molecular and cellular changes with clinical outcomes and in vitro indices of vascular alterations. The results of these studies may have significant implications regarding the recovery of diabetic and other patients after cardiac surgery involving cardioplegia and CPB.
Diabetic patients have increased complications after surgical procedures involving cardiopulmonary bypass (CPB) or extracorporeal circulation. Among diabetic complications, edema formation (blood vessel are more leaky, more permeable to plasma) and length of hospital stay and alterations in coronary blood flow regulation (heart blood flow) are critical aspects of morbidity of CPB. A better understanding of the regulation of the microvasculature (flow and permeability) of diabetic patients may lead to improved outcomes in diabetic patients. The goal of the proposed research is to determine the effect of well-controlled and poorly controlled diabetes mellitus on alterations in vascular function and to investigate the changes that occur in patients undergoing heart surgery. We will use molecular and cellular biology techniques and correlate those findings with clinical outcomes.
|Elmadhun, Nassrene Y; Sabe, Ashraf A; Lassaletta, Antonio D et al. (2015) Ethanol promotes new vessel growth in remote nonischemic myocardium. J Surg Res 193:536-42|
|Lassaletta, Antonio D; Elmadhun, Nassrene Y; Zanetti, Arthus V D et al. (2014) Rapamycin treatment of healthy pigs subjected to acute myocardial ischemia-reperfusion injury attenuates cardiac functions and increases myocardial necrosis. Ann Thorac Surg 97:901-7|
|Elmadhun, Nassrene Y; Sabe, Ashraf A; Lassaletta, Antonio D et al. (2014) Alcohol consumption mitigates apoptosis and mammalian target of rapamycin signaling in myocardium. J Am Coll Surg 218:1175-81|
|Elmadhun, Nassrene Y; Sabe, Ashraf A; Lassaletta, Antonio D et al. (2014) Metabolic syndrome impairs notch signaling and promotes apoptosis in chronically ischemic myocardium. J Thorac Cardiovasc Surg 148:1048-55; discussion 1055|
|Elmadhun, Nassrene Y; Sabe, Ashraf A; Lassaletta, Antonio D et al. (2014) Metformin mitigates apoptosis in ischemic myocardium. J Surg Res 192:50-8|
|Lassaletta, Antonio D; Elmadhun, Nassrene Y; Burgess, Thomas A et al. (2014) Microvascular notch signaling is upregulated in response to vascular endothelial growth factor and chronic myocardial ischemia. Circ J 78:743-51|
|Sabe, Ashraf A; Elmadhun, Nassrene Y; Sadek, Ahmed A et al. (2014) Differential effects of atorvastatin on autophagy in ischemic and nonischemic myocardium in Ossabaw swine with metabolic syndrome. J Thorac Cardiovasc Surg 148:3172-8|
|Sabe, Ashraf A; Elmadhun, Nassrene Y; Dalal, Rahul S et al. (2014) Resveratrol regulates autophagy signaling in chronically ischemic myocardium. J Thorac Cardiovasc Surg 147:792-8; Discussion 798-9|
|Lange, Martin; Fujikawa, Tatsuya; Koulova, Anna et al. (2014) Arterial territory-specific phosphorylated retinoblastoma protein species and CDK2 promote differences in the vascular smooth muscle cell response to mitogens. Cell Cycle 13:315-23|
|Shafique, Ehtesham; Choy, Wing C; Liu, Yuhong et al. (2013) Oxidative stress improves coronary endothelial function through activation of the pro-survival kinase AMPK. Aging (Albany NY) 5:515-30|
Showing the most recent 10 out of 98 publications