Coronary Microvascular and Cardiac Dysfunction Due to Homocysteine Pathometabolism; A Complex Therapeutic Design.

Abstract:

:In various metabolic diseases, both the coronary circulation and cardiac metabolism are altered. Here we summarize the effects of a condition called hyperhomocysteinemia (HHcy) - which can develop due to genetic and/or environmental causes - on the function of coronary microvessels and heart. This metabolic disease is underappreciated, yet even mild or moderate elevation of plasma concentrations of homocystein (Hcy, plasma Hcy >16 µM), a sulfur-containing amino acid produced via methionine metabolism) leads to coronary and peripheral artery and even venous vessel diseases, eliciting vasomotor dysfunction and increased thrombosis, consequently increased morbidity and mortality. Yet the underlying mechanisms have not yet been revealed. Recent studies indicated that there are common pathomechanisms, which may affect several cellular functions. With methionin diet-induced HHcy two main pathomechanisms were revealed: the dysfunction of nitric oxide (NO) pathway resulting in reduced dilator responses of arteries and arterioles, and the simultaneously increased thromboxane A2 (TXA2) activity both in vessels and platelets. These changes are likely due to an increased production of reactive oxidative species (oxidative stress) due to increased NADPH oxidase assembly, which eventually lead to inflammatory processes (indicated by increases in TNFα, NFκbeta, p22phox, p67phox, and rac-1, levels) and changes in various gene expressions and morphological remodeling of vessels. Increased superoxide production and reduced availability of NO alter the regulation of mitochondrial function in the myocardium. The interactions of these pathomechanisms may explain why HHcy increases the uptake of glucose and lactate and decreases the uptake of free fatty acid by the heart. The pathological consequences of HHcy could be worsening by the simultaneous presence of other risk factors, such as hyperlipidemia, diabetes mellitus and metabolic syndrome. All in all, HHcy and associated pathometabolism lead to severe changes and dysfunctions of coronary arterial vessels and cardiac function, which may not always be apparent in clinical settings but most likely contribute to the increased prevalence of cardiovascular diseases and mortality, which however can be reduced by appropriate prevention and treatments. We believe that HHcy is an underestimated - likely due to inappropriate clinical trials - but serious disease condition because it promotes the development of atherosclerosis in large arterial vessels, vasomotor dysfunction in microvessels, hypertension and thrombosis. In this review, we will summarize previous functional findings focusing on coronary vessels and cardiac function and the underlying cellular and molecular mechanisms enabling the development of novel treatments.

journal_name

Curr Pharm Des

authors

Koller A,Szenasi A,Dornyei G,Kovacs N,Lelbach A,Kovacs I

doi

10.2174/1381612824666180625125450

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

2911-2920

issue

25

eissn

1381-6128

issn

1873-4286

pii

CPD-EPUB-91249

journal_volume

24

pub_type

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