title: Evidence for metabolism of N-nitrosoproline.
abstract: The metabolism of nitrosoproline (NPRO) was re-investigated in uni- and bilaterally nephrectomized rats that have reduced or absent ability to excrete urine. About 1% of the administered radioactivity from L-[U-14C]-NPRO appeared as 14CO2 in the expired air and the production of 14CO2 was time-dependent over a period of 23 h. As compared with sham-operation, uni- or bilateral nephrectomy did not significantly increase the amount of NPRO metabolism, though urinary excretion of radioactivity was decreased in the unilaterally nephrectomized animals. In microsome-mediated and in vitro enzyme-free (Udenfriend-hydroxylating) systems covalent binding of [2,3,4,5-3H]NPRO to exogenous calf thymus DNA was demonstrated. The above findings confirm that in vivo metabolism of NPRO is possible, albeit, to a very small extent.
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000378:metabolism; D002250:Carbon Radioisotopes; D004247:DNA / Q000378:metabolism; D004052:Diethylnitrosamine / Q000378:metabolism; D008297:Male; D009602:Nitrosamines / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002250:Carbon Radioisotopes; D009602:Nitrosamines; D002245:Carbon Dioxide; D004052:Diethylnitrosamine; D004247:DNA; C010259:nitrosoproline