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and ß in the Rat Uterus1
a Division for Reproductive Endocrinology, Department of Woman and Child Health, Karolinska Institutet, Stockholm, Sweden
The uterus is an important target organ for steroid hormones. The effects of these hormones are mediated via specific receptors. The aim of this study was to compare the expression, distribution, and regulation of estrogen receptor (ER) 
and ß in the rat uterus in order to establish possible different biological roles for the two receptor forms. Ovariectomized rats were treated with either estradiol (E2), progesterone (P4), or combinations of these for 24 or 48 h. The mRNA levels were measured by solution hybridization. Distribution of the mRNAs and receptor proteins was detected by in situ hybridization and immunohistochemistry. The results showed that ER is the dominating subtype in the rat uterus. E2 seemed to increase the ER mRNA level in the glandular and luminal epithelium, but it caused a decrease of the immunostaining intensity in the glandular epithelium. P4 reduced ER expression in luminal epithelium whereas no effect was seen in the glandular epithelium. E2 or P4 did not alter the expression of ERß, on either the mRNA or protein level. In conclusion, the distribution and regulation of ER and ERß differ in the different compartments of the rat uterus. The complex uterine responses to E2 and P4 are directly or indirectly mediated by differential cell-specific expression of their receptors. The low expression in the uterus and the limited regulation by gonadal steroids in this study suggest that ERß probably plays a minor role in the regulation of uterine physiology.
2 Correspondence: Lena Sahlin, Division for Reproductive Endocrinology, Karolinska Hospital, L5:01, S-17176 Stockholm, Sweden. FAX: 46 8 51773485; lena.sahlin{at}kbh.ki.se
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