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- W2203076144 abstract "We previously reported that birds may concentrate urine by a countercurrent multiplier mechanism using single-solute (NaCl) recirculation, in which the thick ascending limb of Henle (TAL) of mammalian-type nephrons provides an energy source. The Japanese quail TAL has a higher lumen-to-bath Cl flux (JCl,lb) than that of mammals; the mechanism for maintaining the osmotic gradient along the medullary cone is unknown. We investigated whether salt delivery alters the NaCl reabsorption rate in the TAL dissected from both normal and salt-loaded Japanese quail, Coturnix coturnix, 3-7 wk old. When salt loading to the TAL was increased by increasing the perfusion flow rate (PFR), the lumen-to-bath Na and Cl flux coefficients (KNa,lb or KCl,lb, 10(-7) cm2/s) increased, respectively (P < 0.05), from 5.1 +/- 0.9 to 7.6 +/- 0.7 and from 6.8 +/- 0.9 to 8.9 +/- 1.4. Ouabain addition significantly reduced the KNa,lb. A significant correlation existed between PFR and JCl,lb (r = 0.69, P < 0.01) and PFR and JNa,lb. When the TAL was perfused at a low PFR, increasing Cl concentration in the perfusate and bathing medium from 125 to 175 (P < 0.05) or 225 mM (P < 0.01) increased JCl,lb but not KCl,lb, while decreasing Cl concentration decreased JCl,lb but not KCl,lb. Salt loading of intact birds (0.2 M NaCl drinking water) for 7 days increased the plasma Na level and the cloacal fluid-to-plasma osmolality ratio from 0.28 +/- 0.07 to 1.06 +/- 0.05 (P < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2203076144 date "1994-08-01" @default.
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- W2203076144 title "Control of sodium and chloride transport in the thick ascending limb in the avian nephron" @default.
- W2203076144 doi "https://doi.org/10.1152/ajpregu.1994.267.2.r455" @default.
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