PMID- 9238669 OWN - NLM STAT- MEDLINE DCOM- 19970917 LR - 20190512 IS - 1360-9947 (Print) IS - 1360-9947 (Linking) VI - 2 IP - 2 DP - 1996 Feb TI - Nuclear retinoid receptor expression in normal human endometrium throughout the menstrual cycle. PG - 123-9 AB - Previous work has shown that retinoic acid receptors (RARs) and retinoid X receptors (RXRs) are expressed in human endometrial epithelial and stromal cells. These nuclear receptors mediate the biological effects of retinoic acid, a vitamin A derivative which may have an important, though poorly characterized role in the functional differentiation of secretory epithelia. The aim of this study was to find out whether the expression of RAR and RXR mRNA in endometrial epithelial and stromal cells varies in relation to the menstrual cycle. The expression of RARs and RXRs was investigated by Northern blotting and, for stromal cells, there were no differences in expression of RAR-alpha, RAR-beta, RAR-gamma and RXR-alpha between the proliferative and secretory phases of the menstrual cycle. Similarly, for epithelial tissue, there were no significant differences between the proliferative and secretory phases with respect to the expression of RAR-alpha, RAR-gamma and RXR-alpha. However, RAR-beta was expressed at a 1.7-fold higher level in epithelial samples from the proliferative phase compared to the secretory phase. Overall, the levels of expression of RAR-alpha, RAR-beta and RAR-gamma were 1.7- to 4-fold higher in stromal cells compared to epithelial cells whereas RXR-alpha was expressed at a similar level in both cell types. We have previously suggested that retinoic acid has a role in endometrial differentiation or function which may be reflected by cyclical changes in intracellular retinoic acid levels. These data indicate that RARs and RXRs are expressed at a similar level throughout the menstrual cycle, with the possible exception of RAR-beta, implying that any menstrual cycle-related function of RARs in controlled by ligand availability rather than by changes in expression of the receptors. FAU - Kumarendran, M K AU - Kumarendran MK AD - Department of Obstetrics and Gynaecology, Medical School, University of Newcastle, Newcastle upon Tyne, UK. FAU - Loughney, A D AU - Loughney AD FAU - Prentice, A AU - Prentice A FAU - Thomas, E J AU - Thomas EJ FAU - Redfern, C P AU - Redfern CP LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Mol Hum Reprod JT - Molecular human reproduction JID - 9513710 RN - 0 (DNA, Complementary) RN - 0 (Nuclear Proteins) RN - 0 (Receptors, Retinoic Acid) RN - 0 (Retinoid X Receptors) RN - 0 (Transcription Factors) RN - 63231-63-0 (RNA) SB - IM MH - Blotting, Northern MH - DNA, Complementary MH - Endometrium/cytology/*metabolism MH - Epithelium/metabolism MH - Female MH - Gene Expression MH - Humans MH - Menstrual Cycle/*physiology MH - Nuclear Proteins/*biosynthesis/genetics MH - RNA/isolation & purification MH - Receptors, Retinoic Acid/*biosynthesis/genetics MH - Retinoid X Receptors MH - Statistics, Nonparametric MH - Stromal Cells/metabolism MH - Transcription Factors/*biosynthesis/genetics EDAT- 1996/02/01 00:00 MHDA- 1996/02/01 00:01 CRDT- 1996/02/01 00:00 PHST- 1996/02/01 00:00 [pubmed] PHST- 1996/02/01 00:01 [medline] PHST- 1996/02/01 00:00 [entrez] AID - 10.1093/molehr/2.2.123 [doi] PST - ppublish SO - Mol Hum Reprod. 1996 Feb;2(2):123-9. doi: 10.1093/molehr/2.2.123.