Abstract:
:Gestagens and oestrogens are important regulators of pregnancy and parturition. The aim of the present study was the comparative quantification of steroidogenic transcripts in placenta and corpus luteum of cattle and sheep during pregnancy and post partum. Cyp19 transcript variants, derived from different promoters, as well as transcripts of Hsd3b, Cyp11A1, and Cyp17, encoding the steroidogenic enzymes P450arom, 3beta-HSD, P450SCC, and P450C17, respectively, were quantified by newly developed real-time PCR assays. All steroidogenic transcripts were detected in ovine and bovine corpus luteum and placenta during pregnancy, however at a very different concentration. In both species Cyp11A1 and especially Hsd3b transcripts predominated in corpus luteum, outnumbering transcripts of Cyp17 and Cyp19 by more than two and three orders of magnitude, respectively. Cyp19 transcript were found at high concentration in the placenta and at a very low concentration in corpus luteum. Cyp17 transcripts had a relatively low concentration in both, placenta and corpus luteum, however showed a peak of expression in the ovine and bovine term placenta. Tissue- and species-specific Cyp19 transcripts derived from different promoters were detected. In order to map all promoters, the bovine Cyp19 locus was reconstructed by in silico analysis. In the placenta, transcripts were primarily derived from the proximal promoter P1.5 in sheep, but from the distally located P1.1 in cattle. Corpora lutea of both species predominantly expressed P1.1 derived transcripts. Contrary to the bovine, the sheep corpus luteum also showed considerable P1.5 derived expression. This demonstrates that cattle and sheep use different promoters to direct Cyp19 expression during pregnancy.
journal_name
Domest Anim Endocrinoljournal_title
Domestic animal endocrinologyauthors
Vanselow J,Fürbass R,Rehbock F,Klautschek G,Schwerin Mdoi
10.1016/j.domaniend.2004.01.008subject
Has Abstractpub_date
2004-08-01 00:00:00pages
99-114issue
2eissn
0739-7240issn
1879-0054pii
S0739724004000293journal_volume
27pub_type
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journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
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journal_title:Domestic animal endocrinology
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journal_title:Domestic animal endocrinology
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pub_type: 杂志文章
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journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
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journal_title:Domestic animal endocrinology
pub_type: 杂志文章
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更新日期:2005-11-01 00:00:00
abstract::Receptors for LH (LHR) and FSH (FSHR) are expressed in the canine lower urinary tract (LUT). As gonadectomy results in an increase in plasma LH and FSH, the objective of this study was to determine whether there are any differences in the expression of LHR and FSHR in the LUT between intact and gonadectomised dogs. Fo...
journal_title:Domestic animal endocrinology
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