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
中科院分区:
文献类型:
--
作者:
D. Levine;M. Iacovitti;L. Nash;D. Vandorpe
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.
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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
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
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