title: Carbon monoxide, skeletal muscle oxidative stress, and mitochondrial biogenesis in humans.
abstract: Given that the physiology of heme oxygenase-1 (HO-1) encompasses mitochondrial biogenesis, we tested the hypothesis that the HO-1 product, carbon monoxide (CO), activates mitochondrial biogenesis in skeletal muscle and enhances maximal oxygen uptake (Vo(2max)) in humans. In 10 healthy subjects, we biopsied the vastus lateralis and performed Vo(2max) tests followed by blinded randomization to air or CO breathing (1 h/day at 100 parts/million for 5 days), a contralateral muscle biopsy on day 5, and repeat Vo(2max) testing on day 8. Six independent subjects underwent CO breathing and two muscle biopsies without exercise testing. Molecular studies were performed by real-time RT-PCR, Western blot analysis, and immunochemistry. After Vo(2max) testing plus CO breathing, significant increases were found in mRNA levels for nuclear respiratory factor-1, peroxisome proliferator-activated receptor-gamma coactivator-1alpha, mitochondrial transcription factor-A (Tfam), and DNA polymerase gamma (Polgamma) with no change in mitochondrial DNA (mtDNA) copy number or Vo(2max). Levels of myosin heavy chain I and nuclear-encoded HO-1, superoxide dismutase-2, citrate synthase, mitofusin-1 and -2, and mitochondrial-encoded cytochrome oxidase subunit-I (COX-I) and ATPase-6 proteins increased significantly. None of these responses were reproduced by Vo(2max) testing alone, whereas CO alone increased Tfam and Polgamma mRNA, and COX-I, ATPase-6, mitofusin-2, HO-1, and superoxide dismutase protein. These findings provide evidence linking the HO/CO response involved in mitochondrial biogenesis in rodents to skeletal muscle in humans through a set of responses involving regulation of the mtDNA transcriptosome and mitochondrial fusion proteins autonomously of changes in exercise capacity.
authors.affiliation: Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Rhodes
authors.forename: Martha Sue
authors.initials: MS
authors.lastname: Carraway
authors.forename: Claude A
authors.initials: CA
authors.lastname: Piantadosi
authors.forename: Crystal M
authors.initials: CM
authors.lastname: Reynolds
authors.forename: Anne D
authors.initials: AD
authors.lastname: Cherry
authors.forename: T E
authors.initials: TE
authors.lastname: Wester
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Natoli
authors.forename: E Wayne
authors.initials: EW
authors.lastname: Massey
authors.forename: Richard E
authors.initials: RE
authors.lastname: Moon
authors.forename: Hagir B
authors.initials: HB
authors.lastname: Suliman
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology; D000975:Antioxidants / Q000378:metabolism; D015153:Blotting, Western; D002248:Carbon Monoxide / Q000378:metabolism / Q000494:pharmacology*; D002263:Carboxyhemoglobin / Q000378:metabolism; D004272:DNA, Mitochondrial / Q000096:biosynthesis; D004311:Double-Blind Method; D005260:Female; D018628:Gene Dosage; D006801:Humans; D008297:Male; D008856:Microscopy, Fluorescence; D008931:Mitochondria, Muscle / Q000187:drug effects* / Q000378:metabolism*; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism*; D018995:Myosin Heavy Chains / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects*; D010101:Oxygen Consumption / Q000502:physiology; D012313:RNA / Q000096:biosynthesis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D055815:Young Adult
chemical_list: D000975:Antioxidants; D004272:DNA, Mitochondrial; D012313:RNA; D002248:Carbon Monoxide; D002263:Carboxyhemoglobin; D018995:Myosin Heavy Chains