title: Hydrogen Sulfide Levels and Nuclear Factor-Erythroid 2-Related Factor 2 (NRF2) Activity Are Attenuated in the Setting of Critical Limb Ischemia (CLI).
abstract: BACKGROUND
  Cystathionine γ-lyase, cystathionine β-synthase, and 3-mercaptopyruvate sulfurtransferase are endogenous enzymatic sources of hydrogen sulfide (H2S). Functions of H2S are mediated by several targets including ion channels and signaling proteins. Nuclear factor-erythroid 2-related factor 2 is responsible for the expression of antioxidant response element-regulated genes and is known to be upregulated by H2S. We examined the levels of H2S, H2S-producing enzymes, and nuclear factor-erythroid 2-related factor 2 activation status in skeletal muscle obtained from critical limb ischemia (CLI) patients.
  
  
  RESULTS
  Gastrocnemius tissues were attained postamputation from human CLI and healthy control patients. We found mRNA and protein levels of cystathionine γ-lyase, cystathionine β-synthase, and 3-mercaptopyruvate sulfurtransferase were significantly decreased in skeletal muscle of CLI patients as compared to control. H2S and sulfane sulfur levels were significantly decreased in skeletal muscle of CLI patients. We also observed significant reductions in nuclear factor-erythroid 2-related factor 2 activation as well as antioxidant proteins, such as Cu, Zn-superoxide dismutase, catalase, and glutathione peroxidase in skeletal muscle of CLI patients. Biomarkers of oxidative stress, such as malondialdehyde and protein carbonyl formation, were significantly increased in skeletal muscle of CLI patients as compared to healthy controls.
  
  
  CONCLUSIONS
  The data demonstrate that H2S bioavailability and nuclear factor-erythroid 2-related factor 2 activation are both attenuated in CLI tissues concomitant with significantly increased oxidative stress. Reductions in the activity of H2S-producing enzymes may contribute to the pathogenesis of CLI.
authors.affiliation: Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, LA (K.N.I., D.J.P., E.D., D.J.L.).
authors.forename: Kazi N
authors.initials: KN
authors.lastname: Islam
authors.affiliation: Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, LA (K.N.I., D.J.P., E.D., D.J.L.).
authors.forename: David J
authors.initials: DJ
authors.lastname: Polhemus
authors.affiliation: Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, LA (K.N.I., D.J.P., E.D., D.J.L.).
authors.forename: Erminia
authors.initials: E
authors.lastname: Donnarumma
authors.affiliation: Emory University School of Medicine, Atlanta, GA (L.P.B.).
authors.forename: Luke P
authors.initials: LP
authors.lastname: Brewster
authors.affiliation: Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, LA (K.N.I., D.J.P., E.D., D.J.L.).
authors.forename: David J
authors.initials: DJ
authors.lastname: Lefer
mesh_terms: D000368:Aged; D000671:Amputation, Surgical; D015415:Biomarkers / Q000032:analysis; D003541:Cystathionine beta-Synthase / Q000235:genetics / Q000378:metabolism; D003542:Cystathionine gamma-Lyase / Q000235:genetics / Q000378:metabolism; D005260:Female; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D006862:Hydrogen Sulfide / Q000032:analysis*; D007511:Ischemia / Q000601:surgery*; D007866:Leg / Q000098:blood supply* / Q000601:surgery; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism*; D051267:NF-E2-Related Factor 2 / Q000378:metabolism*; D018384:Oxidative Stress / Q000235:genetics; D012333:RNA, Messenger; D015398:Signal Transduction / Q000235:genetics; D013440:Sulfides / Q000032:analysis; D013466:Sulfurtransferases / Q000235:genetics / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D015415:Biomarkers; D051267:NF-E2-Related Factor 2; C495635:NFE2L2 protein, human; D012333:RNA, Messenger; D013440:Sulfides; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D013466:Sulfurtransferases; C021550:3-mercaptopyruvate sulphurtransferase; D003541:Cystathionine beta-Synthase; D003542:Cystathionine gamma-Lyase; D006862:Hydrogen Sulfide
keywords: NRF2; antioxidant proteins; critical limb ischemia; hydrogen sulfide; oxidative stress