Effect of some uremic toxins on oxygen consumption of rats in vivo and in vitro.
In rats, oxygen consumption is reduced by about 40-50% 24 h after bilateral nephrectomy. This is also the case when the animals are pretreated with triiodothyronine, 3 x 0.75 mg/kg body weight orally, for 2-3 days. Indole, cresol, putrescine, methylguanidine or acetoine was given intraperitoneally to normal rats at doses of between 5 and 300 mg/kg body weight. Only low single doses of indole (5 mg/kg) reduced oxygen consumption significantly. Single doses of the other substances studied were ineffective even at tenfold higher doses. Some combinations of these substances, however, (10 mg/kg each), reduced the metabolic rate significantly. In contrast to the results in vivo, plasma of uremic rats, as well as the uremic toxins, dissolved in Krebs-phosphate buffer pH 7.4 at concentrations of 30 mg/dl each, had no influence on respiration of rat diaphragma or liver slices in vitro (single substances and different combinations).
Hohenegger
M
M
Institute of General and Experimental Pathology, University of Vienna, Austria.
Vermes
M
M
Esposito
R
R
Giordano
C
C
D000093:Acetoin / Q000633:toxicity; D000818:Animals; D003408:Cresols / Q000633:toxicity; D004338:Drug Combinations; D007211:Indoles / Q000633:toxicity; D008297:Male; D008760:Methylguanidine / Q000633:toxicity; D010101:Oxygen Consumption / Q000187:drug effects*; D011700:Putrescine / Q000633:toxicity; D051381:Rats; D011919:Rats, Inbred Strains; D014118:Toxins, Biological / Q000633:toxicity*; D014511:Uremia / Q000378:metabolism*
D003408:Cresols; D004338:Drug Combinations; D007211:Indoles; D014118:Toxins, Biological; C032538:4-cresol; D008760:Methylguanidine; C030374:indole; D000093:Acetoin; D011700:Putrescine