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Developing effective countermeasures against acute hydrogen sulfide intoxication: challenges and limitations.

ABSTRACT: Hydrogen sulfide (H2 S) is a chemical hazard in the gas and farming industry. As it is easy to manufacture from common chemicals, it has also become a method of suicide. H2 S exerts its toxicity through its high affinity with metalloproteins, such as cytochrome c oxidase and possibly via its interactions with cysteine residues of various proteins. The latter was recently proposed to acutely alter ion channels with critical implications for cardiac and brain functions. Indeed, during severe H2 S intoxication, a coma, associated with a reduction in cardiac contractility, develops within minutes or even seconds leading to death by complete electromechanical dissociation of the heart. In addition, long-term neurological deficits can develop owing to the direct toxicity of H2 S on neurons combined with the consequences of a prolonged apnea and circulatory failure. Here, we review the challenges impeding efforts to offer an effective treatment against H2 S intoxication using agents that trap free H2 S, and present novel pharmacological approaches aimed at correcting some of the most harmful consequences of H2 S intoxication.

SUBMITTER: Haouzi P

PROVIDER: S-EPMC4940262 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature

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Developing effective countermeasures against acute hydrogen sulfide intoxication: challenges and limitations.

Haouzi Philippe P Sonobe Takashi T Judenherc-Haouzi Annick A

Annals of the New York Academy of Sciences 20160304 1

Hydrogen sulfide (H2 S) is a chemical hazard in the gas and farming industry. As it is easy to manufacture from common chemicals, it has also become a method of suicide. H2 S exerts its toxicity through its high affinity with metalloproteins, such as cytochrome c oxidase and possibly via its interactions with cysteine residues of various proteins. The latter was recently proposed to acutely alter ion channels with critical implications for cardiac and brain functions. Indeed, during severe H2 S ...[more]

PMID: 26945701

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Project description:We used broad-spectrum proteomics to search for key molecules in H2S induced neurotoxicity. Mice were subjected to acute whole body exposure up to 750ppm of H2S at day1 for 40min, followed by 15min daily exposure. Following H2S exposure, inferior colliculi were harvested on day1, day2, and day4 and for proteomics analysis. Samples were processed according to a previously published method with some modifications, Meade et al. 2015. Briefly, inferior colliculus tissues were placed in 100 microliter of urea lysis buffer and homogenized with a handheld pestle homogenizer. Protein samples were further reduced and alkylated. Small aliquots of each sample were taken to measure protein concentration using the Bradford assay. The remaining samples were diluted and trypsin-digested overnight, followed by desalting using a C18 peptide trap from Michrom. The desalted samples were vacufuged prior to individual sample labeling using TMT6plex labels. Labeled samples of each exposure group were combined with the control for sample comparison. Peptides were separated on a Waters BEH C18 capillary column prior to online analysis using a 240min linear increasing gradient of acetonitrile with 0.1 percent formic acid. Following elution from the column, ions were generated using 2.6 kV on a taper tip in a New Objective nano source and entered into an LTQ Orbitrap Velos mass spectrometer. A full scan was taken in the LTQ, followed by data-dependent tandem mass spectrometry analysis of the top six peaks. MSMS analysis included collision-induced dissociation in the LTQ for structural information and higher energy collisional dissociation in the Orbitrap for quantitation. MSMS data were aligned and quantitated using MaxQuant 1.5.4.1 Analytics Platform with PTXQC quality control data management. Peptide alignment was executed with the mouse Uniprot protein database, enzyme trypsin; carboxymethyl, and oxidation, FDR 0.01 percent based on peptide q-value under standard settings.

Dataset Information

Developing effective countermeasures against acute hydrogen sulfide intoxication: challenges and limitations.

Publications

Developing effective countermeasures against acute hydrogen sulfide intoxication: challenges and limitations.

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