Volume 16, Issue 4 pp. 896-910

Inducible hydrogen sulfide synthesis in chondrocytes and mesenchymal progenitor cells: is H2S a novel cytoprotective mediator in the inflamed joint?

Bridget Fox

Bridget Fox

Peninsula Medical School, University of Exeter, St. Luke’s Campus, Exeter, Devon, UK

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Jan-Thorsten Schantz

Jan-Thorsten Schantz

Department of Plastic, Reconstructive and Handsurgery, Klinikum rechts der Isar, Technische Universität München, München, Germany

Division of Plastic Surgery and Bioengineering, National University of Singapore, Singapore

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Richard Haigh

Richard Haigh

Peninsula Medical School, University of Exeter, St. Luke’s Campus, Exeter, Devon, UK

Department of Rheumatology, Royal Devon and Exeter Hospital Trust, Exeter, Devon, UK

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Mark E. Wood

Mark E. Wood

Biosciences, College of Life and Environmental Sciences of Biosciences, University of Exeter, Streatham Campus, Exeter, Devon, UK

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Phillip K. Moore

Phillip K. Moore

Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore

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Nick Viner

Nick Viner

Peninsula Medical School, University of Exeter, St. Luke’s Campus, Exeter, Devon, UK

Department of Rheumatology, Torbay Hospital, Torbay, Devon, UK

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Jeremy P. E. Spencer

Jeremy P. E. Spencer

Department of Chemistry and Food Biosciences, University of Reading, Whiteknights, Berkshire, UK

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Paul G. Winyard

Paul G. Winyard

Peninsula Medical School, University of Exeter, St. Luke’s Campus, Exeter, Devon, UK

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Matthew Whiteman

Corresponding Author

Matthew Whiteman

Peninsula Medical School, University of Exeter, St. Luke’s Campus, Exeter, Devon, UK

Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore

Matthew WHITEMAN, Peninsula Medical School, University of Exeter, St. Luke’s Campus, Magdalen Road, Exeter, Devon EX1 2LU, UK. Tel.:+44(0)1392-722942 E-mail: [email protected] or [email protected]Search for more papers by this author
First published: 17 June 2011
Citations: 109

Abstract

Hydrogen sulfide (H2S) has recently been proposed as an endogenous mediator of inflammation and is present in human synovial fluid. This study determined whether primary human articular chondrocytes (HACs) and mesenchymal progenitor cells (MPCs) could synthesize H2S in response to pro-inflammatory cytokines relevant to human arthropathies, and to determine the cellular responses to endogenous and pharmacological H2S. HACs and MPCs were exposed to IL-1β, IL-6, TNF-α and lipopolysaccharide (LPS). The expression and enzymatic activity of the H2S synthesizing enzymes cystathionine-β-synthase (CBS) and cystathionine-γ-lyase (CSE) were determined by Western blot and zinc-trap spectrophotometry, respectively. Cellular oxidative stress was induced by H2O2, the peroxynitrite donor SIN-1 and 4-hydroxynonenal (4-HNE). Cell death was assessed by 3-(4,5-dimethyl-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays. Mitochondrial membrane potential (DCm) was determined in situ by flow cytometry. Endogenous H2S synthesis was inhibited by siRNA-mediated knockdown of CSE and CBS and pharmacological inhibitors D,L-propargylglycine and aminoxyacetate, respectively. Exogenous H2S was generated using GYY4137. Under basal conditions HACs and MPCs expressed CBS and CSE and synthesized H2S in a CBS-dependent manner, whereas CSE expression and activity was induced by treatment of cells with IL-1β, TNF-α, IL-6 or LPS. Oxidative stress-induced cell death was significantly inhibited by GYY4137 treatment but increased by pharmacological inhibition of H2S synthesis or by CBS/CSE-siRNA treatment. These data suggest CSE is an inducible source of H2S in cultured HACs and MPCs. H2S may represent a novel endogenous mechanism of cytoprotection in the inflamed joint, suggesting a potential opportunity for therapeutic intervention.

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