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Hydrogen sulfide (H 2 S) is constitutively generated in the human body and works as a gasotransmitter in synaptic transmission. In this study, we aimed to evaluate the roles of endogenous H 2 S in generating eupnea at the respiratory center. We employed an in situ arterially perfused preparation of decerebrated rats and recorded the central respiratory outputs. When the H 2 S-producing enzyme cystathionine β-synthase (CBS) was inhibited, respiration switched from the 3-phase eupneic pattern, which consists of inspiration, postinspiration, and expiration, to gasping-like respiration, which consists of inspiration only. On the other hand, when H 2 S synthesis was inhibited via cystathionine γ-lyase (CSE) or when H 2 S synthesis was activated via CBS, eupnea remained unchanged. These results suggest that H 2 S produced by CBS has crucial roles in maintaining the neuronal network to generate eupnea. The mechanism of respiratory pattern generation might be switched from a network-based system to a pacemaker cell-based system in low H 2 S conditions.

Endogenous hydrogen sulfide maintains eupnea in an in situ arterially perfused preparation of rats