Androgen-dependent peptides of the rat ventral prostate nuclear envelope

Nuclear envelope peptides of the rat ventral prostate in the molecular weight region 18,400 to 19,400 show marked androgen dependence. After castration these peptides disappear. Re-administration of testosterone restores them. They were not extracted by 0.1 M NaCl or 5% HClO4 but were partially extracted by 0.35 M NaCl and 1% Triton. These peptides were not present in rat liver nuclear envelopes. As these androgen-dependent non-histone peptides have similar characteristics to androgen-dependent peptides identified in the prostate nucleus, we conclude that the nuclear peptides are at least partially localized to the nuclear envelope.