Analysis of reactive oxygen species, NO, CO and H_2S as therapeutic targets in the immune complex diseases

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To assess the roles of H_2S in the IC induced diseases, reverse passive cutaneous Arthus reaction was conducted using NaHS as an H_2S donor. Furthermore, we conducted similar experiments using selectin-deficient (selectin^<-/->) mice to determine the involvement of selectin molecules in the H_2S mediated pathway. Exogenous application of H_2S dramatically attenuated inflammatory reactions in wild type (WT) mice associated with Arthus reaction. Namely, mRNA expressions of tumor necrosis factor-α, interferon-γ and neutrophil numbers were significantly reduced in the lesional skins of NaHS treated WT mice relative to untreated ones. NaHS treatment significantly reduced these three parameters in the lesional skins of E- and P-selectin^<-/-> mice, but not in those of L- selectin^<-/-> mice. Quite similar results were obtained in the blocking study using WT mice injected with monoclonal antibodies to E-, P- and L-selectin. Our results indicated that exogenous application of H_2S attenuates inflammatory responses in reverse passive Arthus reaction through L-selectin involved pathways, but not through E- or P-selectin pathways.