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Tubuloglomerular feedback in rat kidneys of different renin contents

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Summary

Variations in flow rate through the loop of Henle in the range of 0–50 nl/min were induced using pressure controlled microperfusion. Simultaneously, with the aid of a second pressure-microperfusionsystem, the glomerular function of the same nephron was studied by continuous measurement of two parameters, early proximal flow rate (EPFR) and/or stop flow pressure (SFP). Elevation of loop perfusion above physiological values (40 nl/min) resulted in a drop of EPFR and SFP, whereas lowering perfusion rates had no effect. This feedback behaviour was studied in kidneys with different renin contents to test the role of the renin-angiotensin system in the mediation of the macula densa signal to the adjacent glomerular vessels. Renal renin content, measured after micropuncture experiments by incubation with substrate followed by radioimmunoassay of angiotensin I, was unaltered in control (Ia) and heminephrectomized rats (Ib), lowered in contralateral kidneys of 2 kidneys Goldblatt hypertensive rats (IIa), in DOCA- and salt-loaded rats (IIb), and in DOCA-, salt-loaded and heminephrectomized rats (IIc), and it was elevated in clipped kidneys of Goldblatt hypertension rats (IIIa). Micropuncture evaluation of the tubuloglomerular feedback behaviour in these experimental groups revealed the following results: 1. a feedback response under all conditions independent of the widely varying renin contents (1000-fold), 2. an asymmetrical behaviour of the feedback response in all kidneys as demonstrated by suppression of EPFR and SFP at elevated loop flow rates, but no change of these parameters when loop flow was interrupted, 3. compared to controls the decrease of each GFR parameter between 0 and 40 nl/min loop perfusion was lower in DOCA- and salt-loaded rats (IIb, IIc). Additional heminephrectomy (IIc) had no further influence on the reduced feedback response in DOCA- and salt-loaded rats, whereas this manoeuvre reduced the renal renin content drastically. A somewhat higher response than in controls was found in heminephrectomized rats (IIb) and in clipped kidneys of Goldblatt hypertensive rats (IIIa). These different magnitudes of feedback responses do not correlate with the renal renin content. It has been concluded, therefore, that renal renin activity is not the sole determinant of the effectiveness of the tubuloglomerular feedback response.

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Abbreviations

A I (II):

angiotensin I (II)

COP:

colloid osmotic pressure

DOCA:

dexoxycorticosteroneacetate

EPFR:

early proximal flow rate measured at free flow pressure

JGA:

juxtaglomerular apparatus

P tub :

intratubular hydrostatic pressure

Π:

perfusion rate through Henle's loop

SFP:

stop flow pressure

SN GFR:

single nephron filtration rate

TF:

tubular fluid

TF/P:

concentration ratio between tubular fluid and plasma

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Authors and Affiliations

  1. Institut für Klinische Physiologie und Medizinische Klinik und Poliklinik,Klinikum Steglitz, Freie Universität Berlin, Berlin, Germany

    R. Müller-Suur, H. -U. Gutsche, K. F. Samwer, W. Oelkers & K. Hierholzer

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  1. R. Müller-Suur
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  2. H. -U. Gutsche
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  3. K. F. Samwer
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  4. W. Oelkers
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  5. K. Hierholzer
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Müller-Suur, R., Gutsche, H.U., Samwer, K.F. et al. Tubuloglomerular feedback in rat kidneys of different renin contents. Pflugers Arch. 359, 33–56 (1975). https://doi.org/10.1007/BF00581276

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