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Am J Physiol Regul Integr Comp Physiol 250: R341-R347, 1986;
0363-6119/86 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 250, Issue 3 341-R347, Copyright © 1986 by American Physiological Society

ARTICLES

Diluting segment in avian kidney. II. Water and chloride transport

T. Miwa and H. Nishimura

The mammalian-type nephrons of avian kidneys contain a Henle's loop that runs parallel to the collecting ducts and the vasa recta. Thus we examined whether the thick ascending limb (TAL) of Henle's loop of the avian kidney acts as a diluting segment by measuring water and Cl transport in the isolated and perfused TAL of the quail, Coturnix coturnix. The TAL showed a lumen-positive transepithelial voltage (Vt) (+9.4 +/- 0.4 mV, n = 28). Net water flux (Jv) was nearly zero when the TAL was perfused and bathed with isosmotic solution. When the osmotic gradient was imposed, Jv increased only slightly, and thus the osmotic water permeability (Lp) was low. Arginine vasotocin (AVT) added to the hyperosmotic bath did not alter either Jv, Lp, or Vt. Cl efflux (lumen to bath, 370.4 +/- 27.7 peq X mm-1 X min-1) was higher than Cl influx (bath to lumen, 98.6 +/- 14.3 peq X mm-1 X min-1) when measured in the different tubules. AVT showed no effect on Cl efflux. These results indicate that in the TAL of the quail osmotic water permeability is low while net Cl reabsorption is present, suggesting that the TAL functions as a diluting segment.


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H. Nishimura, Y. Yang, K. Lau, R. J. Kuykindoll, Z. Fan, K. Yamaguchi, and T. Yamamoto
Aquaporin-2 water channel in developing quail kidney: possible role in programming adult fluid homeostasis
Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2007; 293(5): R2147 - R2158.
[Abstract] [Full Text] [PDF]


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