Osteoporosis and vascular disease affect large numbers of aging individuals, and there is increasing evidence that the two disorders are closely related. Both animal and human data indicate that osteoporosis is associated with vascular disease and calcification. Moreover, the process of vascular calcification appears to involve pathways very similar to those utilized during normal bone formation. Circulating endothelial progenitor cells (EPCs) are now increasingly recognized as playing an important role in initiating vascular repair in response to endothelial injury. Our recent demonstration that patients with vascular disease have a 5- to 8-fold greater percentage of EPCs expressing an osteogenic phenotype, as assessed by staining for the bone- related protein, osteocalcin (OCN), has led us to propose the overall novel concept that expression of an osteogenic phenotype by circulating EPCs may explain, at least in part, the increase in vascular calcification that occurs with aging and in the setting of atherosclerosis. In the present, multi-disciplinary proposal utilizing the multiple PI mechanism (Dr. Lerman [Vascular Disease, Cardiology] and Dr. Khosla [Bone Metabolism, Endocrinology]), along with the help of an expert in Vascular Biology (Dr. Simari) as Co-Investigator, we will test this hypothesis within the context of our three Specific Aims:
Aim 1 : Using purified EPCs from patients undergoing cardiac catheterization, test the hypotheses that, as compared to normal control subjects, circulating EPCs from patients with established CAD express an osteogenic """"""""transcriptosome"""""""" (i.e., multiple bone-related genes/pathways) and have an increased ability to form mineralized nodules and/or enhance mineralization of vascular smooth muscle cells in vitro.
Aim 2 : In in vivo studies using murine models, test the hypotheses that that local delivery of EPCs expressing an osteogenic phenotype (defined by staining for the osteoblastic marker, AP), as compared to EPCs negative for AP staining, leads to increases in both subcutaneous bone formation (Aim 2a) and vascular calcification (Aim 2b).
and Aim 3 :In clinical studies in patients with non-obstructive CAD undergoing coronary cardiac catheterization, test the hypotheses that the expression of osteogenic/mesenchymal markers (OCN, AP, Stro-1) by systemically circulating EPCs correlates with early atherosclerosis (as defined by endothelial dysfunction) and with vascular calcification (as assessed by the sensitive method of intravascular ultrasound [IVUS]) (Aim 3a), and that these osteogenic EPCs are being consumed by the coronary circulation (Aim 3b). The proposed studies thus test novel hypotheses using a multidisciplinary approach. Moreover, the results of these studies are likely to have significant implications for our understanding of the mechanisms initiating vascular calcification as well as the increasing pathophysiological link between the vasculature and bone metabolism.

Public Health Relevance

Aging is associated with osteoporosis and with vascular (blood vessel) disease. In addition, patients with osteoporosis (who have reduced bone) have an increased risk of vascular calcification, which is associated with formation of bone-like structures in blood vessels and with heart attacks and strokes. The proposed work focuses on the role of circulating cells which likely arise from the bone marrow in initiating vascular calcification as opposed to normal repair. These studies should help us better understand how vascular calcification occurs, and perhaps ways of modifying the process into a more normal repair process, which would have important implications for the prevention and treatment of heart disease with aging.

National Institute of Health (NIH)
National Institute on Aging (NIA)
Research Project (R01)
Project #
Application #
Study Section
Aging Systems and Geriatrics Study Section (ASG)
Program Officer
Kohanski, Ronald A
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Mayo Clinic, Rochester
United States
Zip Code
Choi, Woong Gil; Prasad, Megha; Lennon, Ryan et al. (2018) Long-term darapladib use does not affect coronary plaque composition assessed using multimodality intravascular imaging modalities: a randomized-controlled study. Coron Artery Dis 29:104-113
Prasad, Megha; Matteson, Eric L; Herrmann, Joerg et al. (2017) Uric Acid Is Associated With Inflammation, Coronary Microvascular Dysfunction, and Adverse Outcomes in Postmenopausal Women. Hypertension 69:236-242
Sara, Jaskanwal D; Sugrue, Alan; Kremen, Vaclav et al. (2016) Electrocardiographic predictors of coronary microvascular dysfunction in patients with non-obstructive coronary artery disease: Utility of a novel T wave analysis program. Int J Cardiol 203:601-6
Helder, Meghana R K; Hennessy, Ryan S; Spoon, Daniel B et al. (2016) Low-Dose Gamma Irradiation of Decellularized Heart Valves Results in Tissue Injury In Vitro and In Vivo. Ann Thorac Surg 101:667-74
Yoshino, Satoshi; Cilluffo, Rebecca; Prasad, Megha et al. (2016) Sex-Specific Genetic Variants are Associated With Coronary Endothelial Dysfunction. J Am Heart Assoc 5:e002544
Sara, Jaskanwal D; Lennon, Ryan J; Ackerman, Michael J et al. (2016) Coronary microvascular dysfunction is associated with baseline QTc prolongation amongst patients with chest pain and non-obstructive coronary artery disease. J Electrocardiol 49:87-93
Jack Jr, Clifford R; Therneau, Terry M; Wiste, Heather J et al. (2016) Transition rates between amyloid and neurodegeneration biomarker states and to dementia: a population-based, longitudinal cohort study. Lancet Neurol 15:56-64
Sara, Jaskanwal D S; Lennon, Ryan J; Gulati, Rajiv et al. (2016) Utility of the Framingham Risk Score in predicting secondary events in patients following percutaneous coronary intervention: A time-trend analysis. Am Heart J 172:115-28
Aoki, Tatsuo; Rodriguez-Porcel, Martin; Matsuo, Yoshiki et al. (2015) Evaluation of coronary adventitial vasa vasorum using 3D optical coherence tomography--animal and human studies. Atherosclerosis 239:203-8
Eirin, Alfonso; Zhu, Xiang-Yang; Ferguson, Christopher M et al. (2015) Intra-renal delivery of mesenchymal stem cells attenuates myocardial injury after reversal of hypertension in porcine renovascular disease. Stem Cell Res Ther 6:7

Showing the most recent 10 out of 74 publications