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Vol. 13, No. 4, 1990
Issue release date: 1990
Section title: Original Paper
Renal Physiol Biochem 1990;13:181–189
(DOI:10.1159/000173353)

Pelvic Pressure and Tubuloglomerular Feedback in Hydronephrosis

Morsing P. · Persson A.E.G.
Department of Physiology and Biophysics, University of Lund, Sweden

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Accepted: 7/25/1989
Published online: 11/7/2008

Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 0

ISSN: 1420-4096 (Print)
eISSN: 1423-0143 (Online)

For additional information: http://www.karger.com/KBR

Abstract

From previous studies on hydronephrotic rats in our laboratory, an increased sensitivity of the tubuloglomerular feedback (TGF) mechanism was found during extracellular volume expansion (VE). In contrast, the mechanism resets to a lower sensitivity during VE in control animals. The resetting in hydronephrotic rats was reversed by blocking the thromboxane (Tx) system. The present study was performed to measure changes in pelvic pressure (Pp) in hydronephrotic kidneys during VE, and the effect of Tx inhibition on those changes. In addition, TGF was characterized during VE of hydronephrotic rats while Pp was kept at the pre-VE level. On VE, Pp increased moderately from a control value of 2.9 mm Hg to a plateau with a mean value of 6.0 mm Hg (control, 0.7 vs. 2.1 mm Hg). After Tx inhibition, Pp was increased by more than 100%, with a plateau value of 13.6 mm Hg. When Pp was normalized and fixed, the direction of resetting of TGF was normal. The results from this study indicate that the resetting of TGF is of importance to keep glomerular filtration rate low and reduce Pp in the hydronephrotic kidney. Tx and Pp are involved in the resetting of TGF.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Accepted: 7/25/1989
Published online: 11/7/2008

Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 0

ISSN: 1420-4096 (Print)
eISSN: 1423-0143 (Online)

For additional information: http://www.karger.com/KBR


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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