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.

METHODS AND 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: Kazi N Islam, David J Polhemus, Erminia Donnarumma, Luke P Brewster, David J Lefer
• Journal: Journal of the American Heart Association (J Am Heart Assoc) Vol. 4 Issue 5 (May 14 2015) ISSN: 2047-9980 [Electronic] England
• PMID: 25977470 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: © 2015 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley Blackwell.

Chemical References

• Biomarkers
• NF-E2-Related Factor 2
• NFE2L2 protein, human
• RNA, Messenger
• Sulfides
• Glutathione Peroxidase
• Superoxide Dismutase
• Sulfurtransferases
• 3-mercaptopyruvate sulphurtransferase
• Cystathionine beta-Synthase
• Cystathionine gamma-Lyase
• Hydrogen Sulfide

Topics

• Aged
• Amputation, Surgical
• Biomarkers (analysis)
• Cystathionine beta-Synthase (genetics, metabolism)
• Cystathionine gamma-Lyase (genetics, metabolism)
• Female
• Glutathione Peroxidase (metabolism)
• Humans
• Hydrogen Sulfide (analysis)
• Ischemia (surgery)
• Leg (blood supply, surgery)
• Male
• Muscle, Skeletal (metabolism)
• NF-E2-Related Factor 2 (metabolism)
• Oxidative Stress (genetics)
• RNA, Messenger
• Signal Transduction (genetics)
• Sulfides (analysis)
• Sulfurtransferases (genetics, metabolism)
• Superoxide Dismutase (metabolism)