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1 Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, S-751 23 Uppsala; 2 Department of Physiology and Pharmacology, Karolinska Institute, S-171 77 Stockholm; 4 Department of Medical Biochemistry, University of Göteborg, S-405 30 Göteborg, Sweden; and 3 Department of Physiology and Pharmacology, University of Southern Denmark, DK-5000 Odense, Denmark
The hypothesis
that adenosine acting on adenosine A1 receptors
(A1R) regulates several renal functions and mediates
tubuloglomerular feedback (TGF) was examined using A1R
knockout mice. We anesthetized knockout, wild-type, and heterozygous
mice and measured glomerular filtration rate, TGF response using the
stop-flow pressure (Psf) technique, and plasma renin
concentration. The A1R knockout mice had an increased blood
pressure compared with wild-type and heterozygote mice. Glomerular
filtration rate was similar in all genotypes. Proximal tubular
Psf was decreased from 36.7 ± 1.2 to 25.3 ± 1.6 mmHg in the A1R+/+ mice and from 38.1 ± 1.0 to
27.4 ± 1.1 mmHg in A1R+/
mice in response to an
increase in tubular flow rate from 0 to 35 nl/min. This response was
abolished in the homozygous A1R
/
mice (from 39.1 ± 4.1 to 39.2 ± 4.5 mmHg). Plasma renin activity was
significantly greater in the A1R knockout mice [74.2 ± 14.3 milli-Goldblatt units (mGU)/ml] mice compared with the wild-type and A1R+/
mice (36.3 ± 8.5 and 34.1 ± 9.6 mGU/ml), respectively. The results demonstrate that adenosine
acting on A1R is required for TGF and modulates renin release.
knockout mice; angiotensin; renin release; micropuncture
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