Regulation of expression of the retinoic acid-synthesising enzymes retinaldehyde dehydrogenases in the uteri of ovariectomised mice after treatment with oestrogen, gestagen and their combination.
The active metabolite of vitamin A, retinoic acid (RA), plays an important role in the female reproductive system. The synthesis of RA is tightly regulated by the activity of retinaldehyde dehydrogenases (Raldh). Among these, Raldh1 and Raldh2 exhibit specific temporal and spatial expression patterns in the mouse uterus, both during the oestrous cycle and early pregnancy. In the present study, we have assessed whether oestradiol and progesterone directly influence the uterine expression of Raldh1 and Raldh2 in ovariectomised mice. We investigated the effect of gestagen (promegestone 0.3 mg kg(-1) bodyweight), oestrogen (oestradiol 3 microg kg(-1) bodyweight) and their combination on the uterine expression of Raldh2. Expression was analysed using in situ hybridisation and quantified using real-time detection reverse transcription-polymerase chain reaction. The results show that the expression of Raldh2 is rapidly (within 1-4 h) induced in stromal cells by oestrogen, but not by gestagen, treatment, whereas combined oestrogen + gestagen treatment leads to a more prolonged (48 h) response. In contrast, oestrogen, but not progesterone, treatment downregulates (within 4-24 h) Raldh1 expression in the uterine glandular epithelium. We conclude that the uterine RA concentrations are regulated by oestrogens via an effect on the expression of the Raldh synthesising enzymes. Such a regulation is consistent with the natural fluctuations of Raldh expression during the oestrous cycle, early pregnancy and blastocyst implantation.
Rühl
Ralph
R
Institute of Nutritional Science, University of Potsdam, 14558 Nuthetal, Germany. rruehl@indi.biochem.dote.hu
Fritzsche
Britta
B
Vermot
Julien
J
Niederreither
Karen
K
Neumann
Ulrike
U
Schmidt
Anja
A
Schweigert
Florian J
FJ
Dollé
Pascal
P
D000445:Aldehyde Oxidoreductases / Q000235:genetics*; D000818:Animals; D004347:Drug Interactions; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D017403:In Situ Hybridization; D007527:Isoenzymes / Q000235:genetics; D051379:Mice; D010052:Ovariectomy; D011374:Progesterone / Q000008:administration & dosage / Q000494:pharmacology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D050697:Retinal Dehydrogenase / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014599:Uterus / Q000187:drug effects* / Q000201:enzymology*
D007527:Isoenzymes; D012333:RNA, Messenger; D011374:Progesterone; D004958:Estradiol; D000445:Aldehyde Oxidoreductases; C470579:RALDH2 protein, mouse; D050697:Retinal Dehydrogenase