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Increase of RNA synthesis during mammary tumor regression.

Summary Regression of two hormone-dependent rat mammary tumors was induced by castration or reduction of the mammotropin level in blood. Both tumors showed a burst of RNA synthesis within a few hr after hormonal deprivation. Synthesis started in the nucleus, reached a broad peak between the 3rd and 18th hr, and terminated between 24 and 48 hr. Estradiol stimulation of regressing tumors also induced a burst of 3 H uptake by RNA but the timing was different; maximum uptake occurred around 20 min after injection with return to basal levels at about 1 hr. Inhibition of RNA and protein synthesis induced by actinomycin D, cycloheximide, and puromycin was unable to affect tumor regression, which proceeded undisturbed as in untreated animals.