主催: 公益社団法人日本薬理学会
会議名: 第97回日本薬理学会年会
回次: 97
開催地: 神戸
開催日: 2023/12/14 - 2023/12/16
We recently reported that brain α7 nicotinic receptor (α7 nAChR) stimulation and brain hydrogen sulfide (H2S) inhibited the rat micturition. In this study, we examined whether brain H2S is involved in the micturition inhibition induced by brain α7 nAChR stimulation in urethane-anesthetized (0.8 g/kg, ip) male Wistar rats. A catheter was inserted into the bladder to perform cystometry (12 ml/h saline infusion). We examined effects of intracerebroventricularly (icv) pretreated GYY4137 (GYY, H2S donor, 1 or 3 nmol/rat) or AOAA (non-selective inhibitor of H2S synthesis, 3 or 10 μg/rat) on PHA568487 (PHA, α7 nAChR agonist, 0.3 or 1 nmol/rat, icv)-induced prolongation of intercontraction intervals (ICI), an index of micturition frequency. PHA (0.3 nmol/rat) showed no significant effect on ICI, while under pretreatment with GYY, PHA significantly prolonged ICI even at a lower dose (0.3 nmol/rat). PHA (1 nmol/rat) induced ICI prolongation and the PHA-induced prolongation was significantly suppressed by AOAA. The AOAA-induced suppression of the PHA-induced ICI prolongation was cancelled by supplementation of brain H2S via GYY. These data suggest that brain α7 nAChR stimulation inhibits the rat micturition via brain H2S.