title: Combination of two oxidant stressors suppresses the oxidative stress and enhances the heat shock protein 27 response in healthy humans.
abstract: We tested the hypothesis that the combination of 2 oxidant stressors (hyperoxia and fatiguing exercise) might reduce or suppress the oxidative stress. We concomitantly measured the plasma concentration of heat shock proteins (Hsp) that protect the cells against the deleterious effects of reactive oxygen species. Healthy humans breathed pure oxygen under normobaric condition for 50-minute periods during which they stayed at rest or executed maximal static handgrip sustained until exhaustion. They also repeated handgrip bouts in normoxic condition. We performed venous blood measurements of 2 markers of the oxidative stress (thiobarbituric acid reactive substances and reduced ascorbic acid) and Hsp27. Under normoxic condition, the handgrip elicited an oxidative stress and a modest increase in plasma Hsp27 level (+7.1 +/- 5.4 ng/mL). Under hyperoxic condition, (1) at rest, compared with the same time schedule in normoxic condition, we measured an oxidative stress (increased thiobarbituric acid reactive substances and decreased reduced ascorbic acid levels) and the plasma Hsp27 level increased (maximal variation, +12.5 +/- 6.0 ng/mL); and (2) after the handgrip, the oxidative stress rapidly disappeared. The combination of both hyperoxia and handgrip bout doubled the Hsp27 response (maximal variation, +24.8 +/- 9.2 ng/mL). Thus, the combination of 2 hits eliciting an oxidative stress seems to induce an adaptive Hsp27 response that might counterbalance an excessive production of reactive oxygen species.
authors.affiliation: UMR MD2 P2COE, Faculté de Médecine, Université de la Méditerranée, 13916 cedex 20 Marseille, France.
authors.forename: Christelle
authors.initials: C
authors.lastname: Brerro-Saby
authors.forename: Stephane
authors.initials: S
authors.lastname: Delliaux
authors.forename: Jean Guillaume
authors.initials: JG
authors.lastname: Steinberg
authors.forename: Alain
authors.initials: A
authors.lastname: Boussuges
authors.forename: Yoann
authors.initials: Y
authors.lastname: Gole
authors.forename: Yves
authors.initials: Y
authors.lastname: Jammes
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000378:metabolism; D001205:Ascorbic Acid / Q000097:blood; D002245:Carbon Dioxide / Q000097:blood; D015444:Exercise / Q000502:physiology; D005260:Female; D055551:HSP27 Heat-Shock Proteins / Q000097:blood*; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology; D016877:Oxidants / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects*; D010100:Oxygen / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D000975:Antioxidants; D055551:HSP27 Heat-Shock Proteins; D016877:Oxidants; D017382:Reactive Oxygen Species; D017392:Thiobarbituric Acid Reactive Substances; D002245:Carbon Dioxide; D019344:Lactic Acid; D001205:Ascorbic Acid; D010100:Oxygen