Secretion of bicarbonate by rat distal tubules in vivo. Modulation by overnight fasting.

Secretion of bicarbonate by rat distal tubules in vivo. Modulation by overnight fasting.
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大鼠体内远端小管分泌碳酸氢盐。

DOI:
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发表时间:
1988
影响因子:
15.9
通讯作者:
D. Vandorpe
D. Vandorpe
中科院分区:
医学1区
文献类型:
--
作者:
D. Levine;M. Iacovitti;L. Nash;D. Vandorpe

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我们对喂食和禁食大鼠的远端小管碳酸氢盐重吸收(JtCO2)进行了微灌注研究,以扩展我们之前对体内碳酸氢盐分泌的观察,并解决自由流动和微灌注数据之间的某些差异。当大鼠禁食过夜时,与之前的自由流动研究一样,用28毫米tCO2溶液进行远端微灌注,在正常流量下会产生显著的JtCO2 (53 +/- 6 pmol.min-1 mm-1),在碳酸氢盐负荷下会迅速增加(91 +/- 16 pmol.min-1 mm-1)。这种响应不受添加其他正常管状流体成分的影响。然而,当使用正常喂养的大鼠时,如我们之前的微灌注研究,在正常流速下灌注28-mM tCO2溶液时,远端小管JtCO2与零没有区别,但在高流速下变为负值(-54 +/- 13 pmol.min-1.mm-1),这表明碳酸氢盐在浓度梯度下存在分泌。空腹大鼠的碱负荷也引起高流量的碳酸氢盐分泌。这些结果首次证明了正常喂养或碱负荷可以诱导哺乳动物体内肾细胞段的碳酸氢盐分泌,并解决了之前自由流动和微灌注数据之间的差异。
We have performed microperfusion studies on distal tubule bicarbonate reabsorption (JtCO2) of fed and fasted rats to extend our previous observations of in vivo bicarbonate secretion and to resolve certain discrepancies between free-flow and microperfusion data. When rats are fasted overnight, as in previous free-flow studies, distal tubule microperfusion with a 28-mM tCO2 solution results in significant JtCO2 (53 +/- 6 pmol.min-1.mm-1) at normal flow and increases briskly (91 +/- 16 pmol.min-1.mm-1) with bicarbonate load. This response is not influenced by the addition of other normal tubular fluid constituents. However, when normally fed rats are used, as in our previous microperfusion studies, distal tubule JtCO2 is not different from zero when a 28-mM tCO2 solution is perfused at normal flow rates but becomes negative (-54 +/- 13 pmol.min-1.mm-1) at high flow rates, which indicates the existence of bicarbonate secretion against a concentration gradient. Alkali loading of fasted rats also elicits bicarbonate secretion at high flow. These results demonstrate for the first time that normal feeding or alkali loading can induce bicarbonate secretion in a mammalian nephron segment in vivo, and resolves previous discrepancies between free-flow and microperfusion data.
DOI: 10.1152/ajprenal.1986.251.2.f173
发表时间: 1986
期刊: The American journal of physiology
影响因子: --
作者:
Steinmetz,PR
通讯作者: Steinmetz,PR
DOI: 10.1172/jci113087
发表时间: 1987-08-01
影响因子: 15.9
作者:
CAPASSO, G;JAEGER, P;MALNIC, G
通讯作者: MALNIC, G
DOI: 10.1172/jci112748
发表时间: 1986
期刊: The Journal of clinical investigation
影响因子: --
作者:
Capasso,G;Kinne,R;Malnic,G;Giebisch,G
通讯作者: Giebisch,G
大鼠远曲小管中碳酸氢盐转运的评估:酸碱状态的影响。
DOI: 10.1152/ajprenal.1982.243.4.f335
发表时间: 1982
期刊: The American journal of physiology
影响因子: --
作者:
Lucci,MS;Pucacco,LR;Carter,NW;DuBoseJr,TD
通讯作者: DuBoseJr,TD