Add time:09/05/2019         Source:sciencedirect.com

S-Nitrosothiols (RSNOs) such as S-nitrosoglutathione (GSNO) are known to produce nitric oxide (NO) through thermal, photolytic, and metal ion-promoted pathways, which has led to their increasing use as exogenous sources of therapeutic NO. Despite the burgeoning NO release applications for RSNOs, their susceptibility to metal-promoted decomposition has rarely been examined in a uniform manner through the specific measurement of NO release. In this study, the ability of various transition and post-transition metal ions to promote NO release from GSNO was surveyed by chemiluminescence-based NO detection. Substantial NO formation (>10-fold increase relative to GSNO baseline) was detected after the addition of Cu2+, Au3+, Pd2+, Pt2+, and V3+. Modest increases were observed in the cases of Co2+, Hf4+, Fe2+, Fe3+, Mn2+, Hg2+, Ni2+, Ag+, Sn2+, and Zr4+, while no effect was evident for Al3+, Cr3+, Pb2+, Sc3+, and Zn2+. It was further observed that In+ compounds initiate the apparent NO-forming decomposition of GSNO, while In0 and In3+ are inactive, indicating that In+ exerts a previously unknown effect on GSNO.

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