The human diploid fibroblast culture, WI-38 was analyzed for chromosomal damage after 24 h exposures to benzo(a)pyrene (BP), 3-methylcholanthrene (MCA), n-methyl-n'-nitrosoguanidine (MNNG), 4-nitroquinoline-1-oxide (4NQO), pyrene and caffeine. A low concentration of 4NQO (0.15 micron) and MNNG (1.9 micron) produced breakage and exchange figures. A relatively high concentration of caffeine (1300 micron) caused breakage. The other compounds (BP, MCA and pyrene) caused little or no increase in damage above the control levels. A 1-h pulse exposure of WI-38 cells to BP (40 micron) in the presence of a rat liver homogenate supernate (S-9) resulted in damage significantly greater than the untreated cells or cells treated with BP alone. 4NQO (0.25 micron) produced exchange figures after a similar 1-h exposure, but this effect was eliminated by the S-9. A much higher concentration of caffeine (10,300 micron) was required to cause breakage greater than control levels after a one hour exposure. The results indicate a possible short term in vitro human cell system for distinguishing carcinogens, procarcinogens, and noncarcinogens.
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