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1 Medical Department M (Endocrinology and Diabetes) and 2 Department of Biological Psychiatry, Institute for Basic Psychiatric Research, Aarhus University Hospital, DK-8000 Aarhus C; and 3 Department of Clinical Physiology, Glostrup Hospital, University of Copenhagen, DK-2600 Glostrup, Denmark
To investigate the mechanisms behind the water-
and sodium-retaining effects of growth hormone (GH), we studied the
effect of GH on 1) water and sodium homeostasis,
2) the renin-angiotensin-aldosterone system (RAAS), and
3) lithium clearance (CLi) with and without concomitant prostaglandin (PG) synthesis inhibition with ibuprofen. GH
administration for 6 days induced a significant increase in plasma
renin, which was abolished by coadministration of ibuprofen (mU · l
1 · 24 h
1: control:
22.4 ± 4.3; GH: 37.7 ± 8.8; ibuprofen: 15.2 ± 3.0; GH + ibuprofen: 19.7 ± 2.5; ANOVA: P < 0.01).
Comparable increments in extracellular volume were seen after 6-day
treatment with GH alone and in combination with ibuprofen [liters:
control, 19.57 ± 0.92; GH, 20.80 ± 1.00 (ANOVA: P
< 0.0005); ibuprofen, 19.38 ± 0.90; GH + ibuprofen,
21.63 ± 1.37 (ANOVA: P < 0.0005)]. Treatment with GH increased CLi and changed the tubular handling of
sodium and water. The absolute distal sodium reabsorption was
increased, and this was only partially counterbalanced by decreased
reabsorption in the proximal tubules. The data demonstrate that
GH-induced activation of the RAAS can be blocked by concomitant PG
synthesis inhibition and that the tubular effects of GH include
increased distal nephron sodium and water reabsorption.
sodium metabolism; renin-angiotensin-aldosterone system; lithium clearance; ibuprofen
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