title: Strain and species effects on the inhibition of hepatocyte intercellular communication by liver tumor promoters.
abstract: The effect of the liver tumor promoters phenobarbital (PB), 1,1-bis(4-chlorophenyl)-2,2,2-trichlorethane (DDT), and dieldrin on gap junction-mediated intercellular communication between primary cultured hepatocytes from male mice (B6C3F1), C3H, C57BL, and Balb/c strains) and male F344 rats was determined. Intercellular communication was detected autoradiographically as the passage and incorporation of [5-3H]uridine nucleotides from prelabelled donor hepatocytes to donor-contacting recipient hepatocytes. At non-toxic concentrations, PB (20-500 micrograms/ml) inhibited intercellular communication between B6C3F1, C3H, and Balb/c mouse hepatocytes and F344 rat hepatocytes, but not between C57BL mouse hepatocytes. DDT (1-10 micrograms/ml) inhibited intercellular communication between hepatocytes from all 4 strains of mice and the F344 rat. Dieldrin (1-10 micrograms/ml) inhibited intercellular communication between hepatocytes from the 4 strains of mice but not between rat hepatocytes. These findings showed a good correlation with the in vivo liver tumor promoting/hepatocarcinogenic actions of PB, DDT and dieldrin in the 4 mouse strains and the F344 rat strain.
mesh_terms: D000818:Animals; D002273:Carcinogens; D002450:Cell Communication / Q000187:drug effects*; D002478:Cells, Cultured; D003043:Cocarcinogenesis; D003634:DDT / Q000633:toxicity*; D004026:Dieldrin / Q000633:toxicity*; D008099:Liver / Q000187:drug effects*; D008114:Liver Neoplasms, Experimental / Q000139:chemically induced; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D010634:Phenobarbital / Q000633:toxicity*; D051381:Rats; D011916:Rats, Inbred F344; D013045:Species Specificity; D014529:Uridine / Q000378:metabolism
chemical_list: D002273:Carcinogens; D003634:DDT; D004026:Dieldrin; D014529:Uridine; D010634:Phenobarbital