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© 1987 Oxford University Press

research-article

Quantitative stereological evaluation of four histochemical markers of altered foci in multistage hepatocarcinogenesis in the rat

Suzanne Hendrich, Harold A. Campbell and Henry C. Pitot 1

McArdle Laboratory for Cancer Research, University of Wisconsin Madison, WI 53706, USA

1To whom correspondence should be addressed

Female F344/N rats dosed with diethylnitrosamine (DEN) 24 h after partial hepatectomy were treated with the promoting agents, phenobarbital (PB) or 3,4,7,8-tetrachlorodibenzo-p-dioxin (TCDD), or the peroxisome proliferating agent, WY 14,643, for 6 months. Another group was subjected to the Solt-Farber protocol. Altered hepatic foci (AHF) were analyzed by quantitative stereology from frozen serial sections stained for gamma-gtutamyl transferase (GGT), canalicular adenosine triphosphatase (ATPase), glucose-6-phosphatase (G6Pase) and the placental isozyme of glutathione S-transferase (PGST). PGST scored more foci in all groups than GGT and ATPase. PGST marked greater focal volume than GGT or ATPase, and PGST marked focal volume equal to or greater than G6Pase in rats treated with PB, TCDD or the Solt-Farber protocol. However, after treatment with WY 14,643, GGT and PGST marked much less focal volume than ATPase or G6Pase, and PGST scored fewer foci than G6Pase. Numerical estimations of foci scored by those markers on the basis of area of the entire tissue section (per cm2) were relatively different from those values determined by quantitative stereology. While these results confirm earlier studies, they demonstrate the importance of quantitative stereologic analysis of AHF during multistage hepatocarcinogenesis.


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