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. 1974 Jun;53(6):1695–1708. doi: 10.1172/JCI107721

Interference with Feedback Control of Glomerular Filtration Rate by Furosemide, Triflocin, and Cyanide

Fred S Wright 1, Jürgen Schnermann 1
PMCID: PMC302666  PMID: 4830232

Abstract

Microperfusion experiments have shown that increases in flow rate of tubule fluid through the loop of Henle are followed by reductions in single nephron glomerular filtration rate (SNGFR) and stop-flow pressure (SFP) measured in the proximal tubule of the same nephron. Because changes in luminal sodium concentration are not consistently related to changes in SNGFR and SFP, we explored the possibility that a transport step at a flow-dependent distal-sensing site might be involved in feedback control of SNGFR. Because the macula densa cells of the distal tubule are adjacent to the glomerular vessels of the same nephrons, they could be the distal-sensing mechanism. We perfused superficial loops of Henle from late proximal to early distal segments in three groups of rats while measuring SFP in the proximal tubule of the same nephron, SNGFR in the proximal tubule of the same nephron, or flow rates of fluid, Na, K, and Cl emerging from the perfused loops. Perfusion solutions used were 0.15 NaCl, Ringer or Ringer with one of several inhibitors of electrolyte transport. Perfusion rates were 10 or 40 nl/min (also, zero during measurements of SFP and SNGFR). With Ringer alone the loop-flow rate increased from 10 to 40 nl/min, caused a decrease in SFP from 37.6 to 32.1 mm Hg, and a decrease in SNGFR from 29.9 to 18.7 nl/min. Concentrations of Na, K, and Cl in early distal fluid and absorption of Na and Cl along the loop segment were also increased when loop perfusion rate was increased. Decreasing the perfusion rate to zero had little effect on SFP or SNGFR. The SFP response to increased flow rate did not occur when the perfusion solution contained furosemide (10-4 M). No reduction of the SFP response was seen with other diuretics tested (amiloride, acetazolamide, ethacrynic acid, mercaptomerin) or with 0.15 M NaCl alone. The SNGFR response to increased perfusion rate was reduced by furosemide, triflocin, and cyanide but not by amiloride. Na and Cl absorption by the perfused segment were inhibited by furosemide, triflocin, cyanide, and amiloride. Amiloride and acetazolamide, probably do not act in the ascending limb. Ethacrynic acid and mercaptomerin are known to be ineffective in rat nephrons. Thus, agents that could have inhibited NaCl absorption by macula densa cells interfered with the feedback mechanism.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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