VASCULAR CALCIFICATION, ATHEROSCLEROSIS AND BONE LOSS (OSTEOPOROSIS): NEW PATHOPHYSIOLOGICAL MECHANISMS AND FUTURE PERSPECTIVES FOR PHARMACOLOGICAL THERAPY

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Abstract

Vascular calcification or ectopic mineralization in blood vessels is an active, cell-regulated process, increasingly recognized as a general cardiovascular risk factor. Ectopic artery mineralization is frequently accompanied by decreased bone mineral density or disturbed bone turnover and development of the osteoporosis. The latest data support the correlation of osteoporosis and atherosclerosis, indicating the parallel progression of two tissue destruction processes with increased fatal and nonfatal coronary events, as well as a  higher fracture risk. Patients with osteoporosis, have a  higher risk of cardiovascular diseases than subjects with normal bone. Many proteins responsible for bone formation and resorption have been identified in the arterial wall. Vascular calcification includes mostly osteogenic and, to a  lesser extent chondrogenic differentiation of osteoblasts and osteoclast-like cells. It has been shown that many of the regulators of bone formation and resorption some bone structural proteins, such as osteoprotegerin (OPG), receptor activator of nuclear factor-κB ligand (RANKL) are also expressed in the atherosclerotic plaque. When RANKL binds to RANK, osteoclasts are activated and bone resorption occurs and processes of vascular calcification become also activated. OPG, protein homologue to receptor activator of nuclear factor-κB (RANK), can bind to RANKL, blocking the binding of RANKL to RANK, that results in inhibition of differentiation of preosteoclasts to mature osteoclasts, lower osteoclast capacity for resorption of bone mineral matrix, and development vascular calcification. The latest data supports that cathepsin K, a cysteine protease, can efficiently degrade type  I  and II collagen, both of which are major matrix components of the bone and atherosclerotic plaque. These findings further underscore the potential of cathepsin K as a target for novel molecules to treat osteoporosis and atherosclerosis. Thus, the discovery of the cytokine RANKL-RANK-OPG system and significant role of the cathepsin K in the process of bone remodeling, vascular calcification and atherosclerosis has made progress in understanding the mechanisms of disease development and possibly to develop new dual therapies. New therapies for osteoporosis and atherosclerosis that may potentially improve or augment existing treatments include the recently approved anti-receptor activator of NF-κB-ligand monoclonal antibody fms (denosumab) and the cathepsin  K  inhibitor odanacatib, presently in the late stage of clinical development.

About the authors

A. Dolzhenko

Martin-Luther University HalleWittenberg

Email: fake@neicon.ru

MD, PhD, Professor, Consultant, Institute of Molecular Medicine,

1 Heinrich-Damerow-Straße, Halle, 06112

Germany

T. Richter

Median Clinic

Email: fake@neicon.ru

MD, PhD, Head of Department of Cardiology,

4 Parkstraße, Bad Lausick, 04651

Germany

S. Sagalovsky

Median Clinic

Author for correspondence.
Email: s.sagalovsky@gmail.com

MD, PhD, Head of Department of Orthopedics,

4 Parkstraße, Bad Lausick, 04651

Germany

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