title: Reciprocal Control of the Circadian Clock and Cellular Redox State - a Critical Appraisal.
abstract: Redox signalling comprises the biology of molecular signal transduction mediated by reactive oxygen (or nitrogen) species. By specific and reversible oxidation of redox-sensitive cysteines, many biological processes sense and respond to signals from the intracellular redox environment. Redox signals are therefore important regulators of cellular homeostasis. Recently, it has become apparent that the cellular redox state oscillates in vivo and in vitro, with a period of about one day (circadian). Circadian time-keeping allows cells and organisms to adapt their biology to resonate with the 24-hour cycle of day/night. The importance of this innate biological time-keeping is illustrated by the association of clock disruption with the early onset of several diseases (e.g. type II diabetes, stroke and several forms of cancer). Circadian regulation of cellular redox balance suggests potentially two distinct roles for redox signalling in relation to the cellular clock: one where it is regulated by the clock, and one where it regulates the clock. Here, we introduce the concepts of redox signalling and cellular timekeeping, and then critically appraise the evidence for the reciprocal regulation between cellular redox state and the circadian clock. We conclude there is a substantial body of evidence supporting circadian regulation of cellular redox state, but that it would be premature to conclude that the converse is also true. We therefore propose some approaches that might yield more insight into redox control of cellular timekeeping.
authors.affiliation: Laboratory of Molecular Biology, Medical Research Council, Francis Crick Avenue, Cambridge CB2 0QH, UK.
authors.forename: Marrit
authors.initials: M
authors.lastname: Putker
authors.affiliation: Laboratory of Molecular Biology, Medical Research Council, Francis Crick Avenue, Cambridge CB2 0QH, UK.
authors.forename: John Stuart
authors.initials: JS
authors.lastname: O'Neill
mesh_terms: D000818:Animals; D057906:Circadian Clocks; D002940:Circadian Rhythm; D003545:Cysteine / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D010084:Oxidation-Reduction
chemical_list: D003545:Cysteine
keywords: biological clock; circadian timekeeping; cysteine oxidation; redox signalling
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