Open AccessMechanisms of Differential Strain Sensitivity in Gastric Carcinogenesis
Author(s) -
Weisburger John H.,
Jones R. Conrad,
Barnes William S.,
Pegg Anthony E.
Publication year - 1988
Publication title -
japanese journal of cancer research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 0910-5050
DOI - 10.1111/j.1349-7006.1988.tb01560.x
Subject(s) - carcinogenesis , strain (injury) , sensitivity (control systems) , differential (mechanical device) , medicine , biology , gastroenterology , pathology , cancer , electronic engineering , engineering , aerospace engineering
The genetically‐controlled, distinct sensitivity of different rat strains to N‐methyl‐N′‐nitro‐N‐nitrosoguanidine (MNNG)‐induced cancer of the glandular stomach and duodenum was investigated. MNNG is activated through thiols, and the thiol content of the glandular stomach, duodenum, and liver of the BN rat tended to be slightly, but not significantly higher than that of the Wistar, Sprague‐Dawley, Lewis, and Buffalo rats. The levels of the DNA repair system, O 6 ‐alkylguanine transferase (AGT), in sensitive Wistar strain rats had values similar to those in resistant Buffalo strain rats. Administration of 80 mg/liter of MNNG in the drinking water for six weeks up to the time of tissue collection yielded the same AGT levels. Of all the parameters examined to account for genetically‐mediated sensitivity to gastrointestinal cancer induction, namely, N‐denitrosation, thiol activation, AGT‐related DNA repair, and cell duplication rates, the latter yielded the best association, although these factors acting together may be involved.