PL
Po 90-dniowym narażeniu szczurów, w odstępach dobowych, na pojedyncze i łączne działanie Pb(CH3COO)2 (10 mg/kg m.c.) i NaNO2 (30 mg/kg m.c.) oznaczono w pełnej krwi poziom methemoglobiny, a w osoczu aktywność aminotransferazy asparaginianowej (AspAT [EC.2.6.1.1]), aminotransferazy alaninowej (AlAT [EC.2.6.1.2]), gamma-glutamylotransferazy (GGTP-azy [EC. 2.3.2.1]) oraz stężenie kreatyniny i mocznika.
EN
The aim of this work was to verify the hypothesis that lead and nitrites given to rats at doses causing methaemoglobinaemia adversely affected the hepatic and renal functions. Male Wistar rats were used. They were divided into 4 groups which received for 3 months per os daily doses of: 1) distilled water (control); 2) sodium nitrite (30 mg/kg b.w.); 3) lead (II) acetate (10 mg/kg b.w.); 4) lead (II) acetate and sodium nitrite at doses as above. The level of methaemoglobin was determined in the whole blood. The activities of alanine aminotransferase (AlAT), aspartate aminotransferase (AspAT), gamma-glutamyltransferase (GGTP) and the levels of creatinine and urea were determined in the blood plasma. Our results show that not only the nitrite but also lead alone increased blood methaemoglobin level. The combined exposure to both xenobiotics revealed their antagonistic action on blood methaemoglobin level. There was an increase of blood serum A1AT and AspAT activities in the rats receiving lead, suggesting toxic action of lead on hepatocyte membranes. A comparable but stronger effect was observed in the rats receiving combined doses of lead and nitrite. Nephrotoxic effects were not observer either in the rats receiving lead alone or in combination with the nitrite.