Cytoplasmic calcium in the mediation of macula densa tubulo-glomerular feedback responses.
Cytoplasmic calcium in the mediation of macula densa tubulo-glomerular feedback responses.
复制标题
细胞质钙介导致密斑肾小管肾小球反馈反应。
DOI：
10.1126/science.6800034
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
Navar,LG
中科院分区：
文献类型：
--
作者：
Bell,PD;Navar,LG
Within each nephron of the mammalian kidney, a feedback mechanism operating between the macula densa segment of the distal tubule and the afferent arteriole participates in the regulation of glomerular filtration rate. Retrograde microperfusion studies in rats were conducted to test the hypothesis that activation of macula densa cytoplasmic calcium is involved in the transmission of feedback signals to the vascular elements. Perfusion into distal tubules with a hypotonic solution (70 milliosmolar) elicited moderate decreases in glomerular pressure of 6 ± 0.8 millimeters of mercury. With the addition of a calcium ionophore (A23187) glomerular pressure decreased by 16 ± 1.1 millimeters of mercury. When a solution devoid of calcium but containing A23187 was used, the feedback response was inhibited. Thus, cytoplasmic calcium within the receptor cells may participate in the transmission of feedback signals to the contractile cells.
