The influence of extracellular and intracellular calcium on the secretion of renin.

The influence of extracellular and intracellular calcium on the secretion of renin.
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DOI:
10.1007/s00424-012-1107-x
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发表时间:
2013-01
影响因子:
4.5
通讯作者:
Beierwaltes, William H.
Beierwaltes, William H.
中科院分区:
医学3区
文献类型:
--
作者:
Atchison, Douglas K.;Beierwaltes, William H.

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血浆、细胞外和细胞内钙的变化会影响肾近肾小球 (JG) 细胞的肾素分泌。细胞内钙升高通过作用于钙抑制性腺苷酸环化酶和钙激活磷酸二酯酶,减少占主导地位的第二信使细胞内环磷酸腺苷 (cAMP),从而直接抑制 JG 细胞释放肾素。细胞外钙增加还通过刺激 JG 细胞上的钙敏感受体 (CaSR) 直接抑制肾素释放,导致细胞内环境发生平行变化并减少细胞内 cAMP。在体内,血浆钙急剧升高会通过甲状旁腺激素介导的肾皮质间质钙升高刺激 JG 细胞 CaSR 来抑制血浆肾素活性 (PRA)。然而,长期升高的血浆钙或 CaSR 激活实际上可能会刺激 PRA。 PRA 的升高可能是钙介导的多尿症的一种代偿机制。因此,在体外或体内改变细胞外钙会导致 cAMP 的急性变化,从而导致肾素释放,但钙的慢性变化可能会导致更复杂的相互作用,这取决于变化的持续时间和身体对这些变化的反应的整合。
Changes in plasma, extracellular and intracellular calcium can affect renin secretion from the renal juxtaglomerular (JG) cells. Elevated intracellular calcium directly inhibits renin release from JG cells by decreasing the dominant second messenger intracellular cyclic adenosine monophosphate (cAMP) via actions on calcium-inhibitable adenylyl cyclases and calcium-activated phosphodiesterases. Increased extracellular calcium also directly inhibits renin release by stimulating the calcium-sensing receptor (CaSR) on JG cells, resulting in parallel changes in the intracellular environment and decreasing intracellular cAMP. In vivo, acutely elevated plasma calcium inhibits plasma renin activity (PRA) via parathyroid hormone-mediated elevations in renal cortical interstitial calcium that stimulate the JG cell CaSR. However, chronically elevated plasma calcium or CaSR activation may actually stimulate PRA. This elevation in PRA may be a compensatory mechanism resulting from calcium-mediated polyuria. Thus, changing the extracellular calcium in vitro or in vivo results in inversely related acute changes in cAMP, and therefore renin release, but chronic changes in calcium may result in more complex interactions dependent upon the duration of changes and the integration of the body’s response to these changes.
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