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AJP - Renal Physiology, Vol 259, Issue 1 147-F156, Copyright © 1990 by American Physiological Society
ARTICLES |
L. Chen, S. K. Williams and J. A. Schafer
Department of Physiology and Biophysics, University of Alabama, Birmingham 35294.
We examined the time course of changes in osmotic water permeability (Pf, micron/s), lumen-to-bath 22Na+ flux (Jl----b, pmol.min-1.mm-1), and transepithelial voltage (VT, mV) in response to arginine vasopressin (AVP) in isolated perfused rat and rabbit cortical collecting ducts (CCD). CCDs were isolated from "normal" (untreated) animals and animals 4-14 days after an intramuscular depot injection of deoxycorticosterone pivalate (DOC; 35 mg/rabbit, 5 mg/rat). In the normal rat CCD, 220 pM AVP added to the bathing solution increased Pf from approximately 0 to 981 +/- 120, Jl----b from 24 +/- 5 to 62 +/- 9, and VT from -0.7 +/- 0.6 to -4.0 +/- 0.6 (mean +/- SE; P less than 0.05). The effect of AVP on Pf in DOC-treated rats was not significantly different, but the effects on Jl----b and VT were greater. Jl----b rose from a control value of 78 +/- 16 to 192 +/- 14 with AVP, and VT hyperpolarized from -4.2 +/- 1.6 to -12.2 +/- 0.4. All of these effects of AVP in the normal and DOC-treated rat CCD persisted for greater than or equal to 90-150 min. In DOC-treated rabbit tubules, AVP caused a stable increase in Pf from 9 +/- 6 to 800 +/- 199, which was significantly greater than in normal tubules (379 +/- 32). In the normal rabbit CCD we confirmed previous observations that AVP produces only a transient increase in Na+ absorption and VT; Jl----b increased from 76 +/- 4 to 96 +/- 7 during the period 15-25 min after AVP addition but subsequently fell to 80 +/- 6; VT transiently hyperpolarized from -55 +/- 7 to -64 +/- 8 at 3-8 min after AVP and then fell to -54 +/- 9. In DOC-treated rabbit CCDs, AVP produced no change whatsoever in Jl----b, which was not significantly different from the control value of 99 +/- 7, nor in VT, which was -68 +/- 8 mV. These results indicate fundamental differences in the response of the rat and rabbit CCD to AVP and the presence or absence of synergistic interactions with mineralocorticoids, which may relate to their differing response to other autacoids.
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