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Abstract

Effects of MK-196 and furosemide on rat medullary thick ascending limbs of Henle in vitro.

L C Stoner and M E Trimble
Journal of Pharmacology and Experimental Therapeutics June 1982, 221 (3) 715-720;
L C Stoner
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M E Trimble
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Abstract

The effects of the diuretic agents, MK-196 (6,7-dichloro-2-methyl-1-oxo-2-phenyl-5-indanyloxy acetic acid) and furosemide on function of medullary thick ascending limb (tALH) isolated from the rat kidney were studied. tALH were dissected from whole kidneys of male Sprague-Dawley rats which were first perfused in vitro in a recirculating system for 10 to 15 min with a solution containing collagenase. Standard techniques for dissection and perfusion of tALH were followed. Control transepithelial voltage averaged +5.5 +/- 0.5 mV (n = 25). Drug concentration causing 50% inhibition of the voltage (EC50) was determined. EC50 for both MK-196 and furosemide in rat tALH was 8 X 10(-6) M (EC50 for MK-196 in rabbit tALH ws 7 X 10(-5) M). In other experiments, net chloride transport (JCl) in rat tALH averaged 142 +/- 19 pmol.mm-1.min-1 (n = 12), a value nearly twice that reported for the rabbit. In the rat, MK-196 (2 X 10(-4) M) reduced the voltage by 79 +/- 2% and JCl by 76 +/- 13% (n = 6). The same concentration of furosemide inhibited the voltage by 78 +/- 8% and the JCl by 104 +/- 4%(n = 5). Results indicate that: 1) rat tALHs dissected from collagenase-treated kidneys have functional characteristics similar to those reported for the rabbit tALH; and 2) the rat tALH is equally sensitive to MK-196 and furosemide, drugs which act to selectively inhibit active chloride transport.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 221, Issue 3
1 Jun 1982
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Abstract

Effects of MK-196 and furosemide on rat medullary thick ascending limbs of Henle in vitro.

L C Stoner and M E Trimble
Journal of Pharmacology and Experimental Therapeutics June 1, 1982, 221 (3) 715-720;

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Abstract

Effects of MK-196 and furosemide on rat medullary thick ascending limbs of Henle in vitro.

L C Stoner and M E Trimble
Journal of Pharmacology and Experimental Therapeutics June 1, 1982, 221 (3) 715-720;
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