title: Calcium channel antagonists and renin release.
abstract: Calcium (Ca2+) is an inhibitory second messenger in the renin secretory process, and evidence suggests that first messengers can alter Ca2+ in the renin-secreting juxtaglomerular cells by altering Ca2+ influx, efflux, and mobilization pathways. Influx of Ca2+ through voltage-operated channels is one such pathway, and it has been suggested that pressure-induced changes in renin secretion (the baroreceptor mechanism) are mediated by depolarization-induced Ca2+ influx. On this basis, renin secretion should be stimulated by organic calcium channel antagonists; however, stimulation is only occasionally observed. Therefore, other effects of these substances counteract the stimulatory effects on renin secretion.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D002121:Calcium Channel Blockers / Q000494:pharmacology*; D066298:In Vitro Techniques; D007473:Ion Channels / Q000187:drug effects / Q000378:metabolism; D007606:Juxtaglomerular Apparatus / Q000187:drug effects / Q000502:physiology; D007668:Kidney / Q000187:drug effects / Q000502:physiology; D012083:Renin / Q000378:metabolism*
chemical_list: D002121:Calcium Channel Blockers; D007473:Ion Channels; D012083:Renin; D002118:Calcium