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Abstract

COENZYME Q10 AND ITS ROLE IN HUMAN HEALTH

Bishal Misra, Partha Pratim Mahata*, Shreya Sen Choudhury, Amit Sardar andSamprita Chakraborty

ABSTRACT

Coenzyme Q10 (CoQ10), known as ubiquinone or ubidecarenone, is a fat-soluble, vitamin-like substance found throughout the body which is involved in various types of essential cellular process. Coenzyme Q is well defined as a crucial component of the oxidative phosphorylation process in mitochondria which converts the energy in carbohydrates and fatty acids into ATP to drive cellular machinery and synthesis. New roles for coenzyme Q in other cellular functions are only becoming recognized. The new aspects have developed from the recognition that coenzyme Q can undergo oxidation/reduction reactions in other cell membranes such as lysosomes, Golgi or plasma membranes. In mitochondria and lysosomes, coenzyme Q undergoes reduction/oxidation cycles during which it transfers protons across the membrane to form a proton gradient. The presence of high concentrations of quinol in all membranes provides a basis for antioxidant action either by direct reaction with radicals or by regeneration of tocopherol and ascorbate. Evidence for a function in redox control of cell signaling and gene expression is developing from studies on coenzyme Q stimulation of cell growth, inhibition of apoptosis, control of thiol groups, formation of hydrogen peroxide and control of membrane channels. Deficiency of coenzyme Q has been described based on failure of biosynthesis caused by gene mutation, inhibition of biosynthesis by HMG coA reductase inhibitors (statins) or for unknown reasons in ageing and cancer. Correction of deficiency requires supplementation with higher levels of coenzyme Q than are available in the diet.

Keywords: Redox component, polyisoprenoid side-chain, Antioxidant radical, mitochondrial encephalomyopathy, Energy starvation, glycaemic control.


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