Importance of Mitochondria in the Endothelial Dysfunction of Type 2 Diabetes

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DESCRIPTION (provided by applicant): The applicant has designed this proposal to be an intensive educational and research experience that will allow him to earn key skills to become an independent translational investigator applying the tools of computational genomics and bioinformatics to the study vascular biology and the development of atherosclerosis. To this end, the Medical College of Wisconsin provides an ideal setting for this training. The applicant's mentor, Dr. David Gutterman, is an internationally recognized expert in the study of endothelial function. Through collaborations with Drs. UN Broeckel, Daniel Beard, and Craig Struble, he will receive exceptional training in genomic research and have wide exposure to experts in genetic research and the field of bioinformatics. The vascular endothelium plays a key role in maintaining vascular homeostasis. Endothelium-derived nitre oxide (NO) is a key paracrine actor responsible for maintaining endothelial homeostasis. Excessive reactive oxygen species (ROS) production in Type II diabetics leads to a decrease in bioavailable NO, making the endothelium "dysfunctional". This leads to phenotypic changes that promote the development of atherosclerosis. Recent data suggest hyperpolarization of the inner mitochondrial membrane is an important source of excessive ROS in type 2 diabetics. Excessive ROS leads to a loss of mitochondria mass, altered transcription of mitochondrial-associated genes, and finally a loss of bioavailable NO . The applicant has designed a set of investigations to assess novel markers of mitochondrial homeostasis (mitochondrial membrane potential, mitochondrial mass, mitochondrial ROS production, and oxidative phophorylation- related gene transcription) in type 2 diabetics and healthy humans. First, we will compare these measures of mitochondrial homeostasis to measures of endothelial function in diabetics and non-diabetics. Second, we will determine whether interfering with mitochondrial hyperpolarization that occurs in diabetes with by partial uncoupling of oxidative phosporylation improves endothelial function and reduces ROS production in these patients. RELEVANCE (See instructions): The incidence of Type 2 diabetes continues to rise, and with this rise comes an associated increase in risk for cardiovascular complications. These studies offer valuable insight into the role of mitochondria in endothelial regulation and may reveal novel markers of risk and targets for therapy. (End of Abstract)