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High-resolution autoradiographic localization of 3,4-benzpyrene-3H in mouse skin.

Tritiated 3,4-benzpyrene was traced at intervals between 1 hr and 21 days by autoradiography with both light and electron microscopes after topical application to the skin of mice. The sebaceous glands were the most heavily labeled site 1 and 4 hr after application. Electron microscopy showed labeling of a variety of cellular components in both sebaceous and epidermal cells. No one organelle appeared to be exclusively associated with the tracer. Nuclei were labeled in proportion to their cytoplasm, but generally to lesser degrees. The findings are consistent with previous work on the binding of hydrocarbon carcinogens to soluble proteins and DNA. The data also support the hypothesis that the binding of carcinogen is proportional to cellular synthetic activity.