Inhibitory effect of all-trans retinoic acid on androgen-induced growth of mouse seminal vesicles in vivo and its mechanism

Abstract

We examined the effect of all-trans retinoic acid (ATRA) on the androgen-induced growth of mouse seminal vesicles (SVs) in vivo and its mechanisms. Testosterone propionate (TP) alone or with ATRA was injected daily into adult castrated BALB/c mice. Injections of ATRA significantly inhibited the TP-induced growth of SVs in terms of wet weight and DNA synthesis by a pair of SVs evaluated by [³H]thymidine uptake. The bromodeoxyuridine labelling index showed that ATRA inhibited the proliferation of both epithelial and stromal cells. Immunoreactivity for retinoic acid receptor-a was found in the basal epithelial cells. Injections of ATRA affected neither 5a-reductase activity nor the expression of mRNAs for TGF-b1, 2 and 3 and TGF-b receptor 1 and 2 in the SVs. However, androgen receptor (AR) binding assays and Western blotting revealed a decrease in AR without a change in ligand-binding affinity. The present study showed that retinoid inhibited the androgen-induced growth of mouse SVs in vivo, and suggests that a decrease in AR is one of its mechanisms.

Keywords

androgen receptor in vivo RAR-a retinoic acid seminal vesicle

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