Estrogen and Progesterone Receptor MRNA Are Expressed in Distinct Pattern in Male Primate Reproductive Organs

Overview

Journal J Assist Reprod Genet

Publisher Springer

Specialties Genetics
Reproductive Medicine

Date 1995 Mar 1

PMID 8520186

Citations 7

Authors

O Heikinheimo

M C Mahony

K Gordon

J G Hsiu

G D Hodgen

W E Gibbons

Affiliations

Soon will be listed here.

Abstract

Purpose: The role(s) of estrogens (E) and progesterone (P) in male reproductive physiology remain unclear. Estrogens are used in the treatment of prostatic cancer. Progestins have been used to control excessive sexual behavior in men, and proposed as a male contraceptive. Previous immunohistochemical studies have shown that E receptors (ER) are present in the reproductive tract of male nonhuman primates.

Method: We examined the expression pattern of ER and progesterone receptor (PR) mRNA in adult primate male reproductive tract. mRNA was extracted from male pituitary, testis, prostate and different regions of the epididymis of three intact adult cynomolgous monkeys. Ovarian, myometrial and spleen mRNA were used as controls. Reverse transcriptase polymerase chain reaction (RT-PCR) was used to amplify ER and PR mRNA; beta-actin mRNA was used as a reference. Primers for ER, PR and beta-actin were designed using the most conserved areas in the corresponding human cDNA sequences, and the identity of the PCR products was verified using Southern hybridization. Semiquantitative analysis of ER and PR mRNA content in different parts of the male reproductive tract was carried out by spiking the PCR reaction with 33P-dCTP, and amplifying the samples for 20 cycles with the beta-actin primers, whereas 30 cycles were used for ER and PR.

Results: The results are expressed as cpm ratios of ER or PR/beta-actin. All the male reproductive organs studied revealed a strong signal for ER and PR mRNA. The results of the semiquantitative analysis indicate that the expression of both ER and PR was highest in testis (mean +/- SE 6.4 +/- 1.3 and 0.5 +/- 0.1, respectively). The mean figures for prostate were 0.5 and 0.4, respectively. The mean content of ER and PR in the different areas of epididymis was 0.5 and 0.1, respectively. The epididymal ER mRNA was highest in the corpus region (ER/beta-actin 0.7), the ratio being 0.4 for the caput and cauda regions. The expression pattern of PR mRNA was different, and the caput of epididymis being the most intense (0.2). Surprisingly, the pituitary content of ER and PR mRNA was close to that seen in the ovary, the mean +/- SE values being 7.6 +/- 0.5 and 1.3 +/- 0.1, respectively.

Conclusions: We, therefore, conclude that male monkey reproductive tract contains mRNA for ER and PR, and there appears to be regional variation in their expression. Thus the role(s) of Es and P in male reproductive physiology, specifically in sperm maturation, warrants further investigations.

Citing Articles

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