TY - JOUR
T1 - Urinary excretion of 06-butylguanine after the administration of N-nitroso-N-butylurea in rats
AU - Airoldi, Luisa
AU - Galli, Alessandra
AU - Magagnotti, Cinzia
AU - Bagnati, Renzo
AU - Lolli, Marco
AU - Fanelli, Roberto
PY - 1992/12/1
Y1 - 1992/12/1
N2 - 06-Butylguanine was detected in the urine of rats given the butylating agent N-nitroso-N-butylurea. O6-Butylguanine contents in the 24-h rat urine samples after i.p. doses of 50, 100, and 200 mg/kg N-nitroso-N-butylurea were 1.03 ± 0.41 (SE), 8.30 ± 1.70, and 59.53 ± 6.52 pmol, respectively. This suggests that O6-butylguanine formation in nucleic acids might be repaired in vivo, possibly by base excision, besides other mechanisms. After i.v. doses of 0.1 and 1 mg/kg of O6-butylguanine to rats urinary excretion did not exceed 2% of the administered dose, suggesting that the amount of O6-butylguanine effectively released by base excision might be much larger than that detected in the urine after N-nitroso-N-butylurea. Inhibition of the enzyme O6-alkyl-DNA transferase by N-nitrosodimethylamine increased urinary O6-butylguanine resulting from exposure to N-nitroso-N-butylurea (100 mg/kg i.p.) up to four times, thus confirming an alternative DNA repair mechanism.
AB - 06-Butylguanine was detected in the urine of rats given the butylating agent N-nitroso-N-butylurea. O6-Butylguanine contents in the 24-h rat urine samples after i.p. doses of 50, 100, and 200 mg/kg N-nitroso-N-butylurea were 1.03 ± 0.41 (SE), 8.30 ± 1.70, and 59.53 ± 6.52 pmol, respectively. This suggests that O6-butylguanine formation in nucleic acids might be repaired in vivo, possibly by base excision, besides other mechanisms. After i.v. doses of 0.1 and 1 mg/kg of O6-butylguanine to rats urinary excretion did not exceed 2% of the administered dose, suggesting that the amount of O6-butylguanine effectively released by base excision might be much larger than that detected in the urine after N-nitroso-N-butylurea. Inhibition of the enzyme O6-alkyl-DNA transferase by N-nitrosodimethylamine increased urinary O6-butylguanine resulting from exposure to N-nitroso-N-butylurea (100 mg/kg i.p.) up to four times, thus confirming an alternative DNA repair mechanism.
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M3 - Article
C2 - 1423317
AN - SCOPUS:0026614818
VL - 52
SP - 6699
EP - 6701
JO - Journal of Cancer Research
JF - Journal of Cancer Research
SN - 0008-5472
IS - 23
ER -