The overall goal of this project is to establish the angiogenic efficacy of two pharmacological interventions in the postinfarcted and ischemic heart: a thyroxine analog, diiodothyropropionic acid (DITPA), and the bradycardic drug, alinidine. This goal is based on the rationale that these two agents stimulate mechanical or metabolic factors which then trigger the cascade of angiogenic events which will enhance myocardial perfusion in surviving, hypertrophic myocardium, or in tahe ischemic myocardium. The first three aims will be based on data from male rats, while the fourth aim will utilize beagles.
Aim 1 will test the hypothesis that treatment with these agents will stimulate not only the capillary network, but also the growth of resistance vessels, thus normalizing coronary reserve.
This aim will include a variety of angiogenic assays, as well as myocardial perfusion and ventricular function measurements under various conditions.
Aim 2 will identify the spatial and temporal expression of growth factors which regulate the angiogenic response, e.g., basic fibroblast growth factor, vascular endothelial growth factor, and transforming growth factor-beta by utilizing in situ hybridization, blotting, and immunohistochemical techniques.
Aim 3 focuses on tahe role of aging in the postinfarcted heart's ability to vascularize in response to the two therapeutic interventions. The use of aged rats in this proposal is of particular importance since myocardial infarction occurs most frequently in older individuals. The experimental protocols in the first two aims will be utilized to explore this aim in middle-aged and senescent rats.
Aim 4 will test hypotheses regarding the efficacy of DITPA and alinidine in stimulating growth of collaterals as well as capillaries and arterioles during ischemia, induced by gradual coronary artery occlusion. These studies in beagles compliment the rat studies, by providing a model of ischemia in a non-hypertrophic heart. Our studies addresss non-invasive therapies which may be readily used in humans with ischemic heart disease or with compensatory hypertrophy and remodeling resulting from myocardial infarction. Such interventions have a number of advantages over more invasive interventions, e.g., the delivery of oxogenous growth factors or gene therapy.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL062587-04
Application #
6619591
Study Section
Cardiovascular and Renal Study Section (CVB)
Program Officer
Liang, Isabella Y
Project Start
2000-09-15
Project End
2005-07-31
Budget Start
2003-08-01
Budget End
2005-07-31
Support Year
4
Fiscal Year
2003
Total Cost
$330,750
Indirect Cost
Name
University of Iowa
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
062761671
City
Iowa City
State
IA
Country
United States
Zip Code
52242
Dedkov, Eduard I; Bogatyryov, Yevgen; McCooey, Daniela Scaldaferri et al. (2015) Effect of Chronic Heart Rate Reduction by I(f) Current Inhibitor Ivabradine on Left Ventricular Remodeling and Systolic Performance in Middle-Aged Rats With Postmyocardial Infarction Heart Failure. J Cardiovasc Pharmacol Ther 20:299-312
Bogatyryov, Yevgen; Tomanek, Robert J; Dedkov, Eduard I (2013) Structural composition of myocardial infarction scar in middle-aged male and female rats: does sex matter? J Histochem Cytochem 61:833-48
Dedkov, Eduard I; Zheng, Wei; Christensen, Lance P et al. (2007) Preservation of coronary reserve by ivabradine-induced reduction in heart rate in infarcted rats is associated with decrease in perivascular collagen. Am J Physiol Heart Circ Physiol 293:H590-8
Dedkov, Eduard I; Zheng, Wei; Tomanek, Robert J (2006) Compensatory growth of coronary arterioles in postinfarcted heart: regional differences in DNA synthesis and growth factor/receptor expression patterns. Am J Physiol Heart Circ Physiol 291:H1686-93
Dedkov, Eduard I; Christensen, Lance P; Weiss, Robert M et al. (2005) Reduction of heart rate by chronic beta1-adrenoceptor blockade promotes growth of arterioles and preserves coronary perfusion reserve in postinfarcted heart. Am J Physiol Heart Circ Physiol 288:H2684-93
Lamping, Kathryn G; Zheng, Wei; Xing, Dezhi et al. (2005) Bradycardia stimulates vascular growth during gradual coronary occlusion. Arterioscler Thromb Vasc Biol 25:2122-7
Zheng, Wei; Christensen, Lance P; Tomanek, Robert J (2004) Stretch induces upregulation of key tyrosine kinase receptors in microvascular endothelial cells. Am J Physiol Heart Circ Physiol 287:H2739-45
Zheng, Wei; Weiss, Robert M; Wang, Xinguo et al. (2004) DITPA stimulates arteriolar growth and modifies myocardial postinfarction remodeling. Am J Physiol Heart Circ Physiol 286:H1994-2000
Tomanek, Robert J; Zheng, Wei; Yue, Xinping (2004) Growth factor activation in myocardial vascularization: therapeutic implications. Mol Cell Biochem 264:3-11
Lei, Li; Zhou, Ruifeng; Zheng, Wei et al. (2004) Bradycardia induces angiogenesis, increases coronary reserve, and preserves function of the postinfarcted heart. Circulation 110:796-802

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