کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9900390 | 1544844 | 2005 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ovarian and placental production of progesterone and oestradiol during pregnancy in reindeer
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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![عکس صفحه اول مقاله: Ovarian and placental production of progesterone and oestradiol during pregnancy in reindeer Ovarian and placental production of progesterone and oestradiol during pregnancy in reindeer](/preview/png/9900390.png)
چکیده انگلیسی
We obtained uterine and peripheral venous plasma, and samples of luteal and placental tissues from 2- to 7-year-old, Eurasian mountain reindeer (Rangifer tarandus tarandus) from a free-living, semi-domesticated herd in northern Norway in November 1995, and February and March 1996. In November, ovarian venous blood was also collected from four animals. Plasma samples were assayed for progesterone and oestradiol. The tissue samples were examined by light and electron microscopy, steroid dehydrogenase histochemistry, and northern blot analysis for RNAs for 3β-hydroxy-steroid dehydrogenase (3β-HSD) and P450 (side chain cleavage (scc)). Peripheral blood was taken from non-pregnant females in the same herd on the same dates. Peripheral progesterone concentrations in pregnant reindeer (3.4±0.5 ng/ml, n=8) clearly exceeded those in non-pregnant animals (0.40±0.14 ng/ml; P<0.0004, n=10) but oestradiol levels were only marginally higher in pregnant (6.0±0.7 pg/ml) than in non-pregnant (4.8±0.5 pg/ml; P=0.35) reindeer at the stages examined. In pregnant animals, peripheral progesterone and oestradiol concentrations rose slightly between November and March but the differences did not reach significance (progesterone, P=0.083; oestradiol, P=0.061). In November, progesterone concentrations in the ovarian vein (79±15 ng/ml) greatly exceeded (P<0.03) those in the uterine vein (10±4 ng/ml) which in turn exceeded the levels in the peripheral blood (2.8±0.4 ng/ml; P<0.29). Oestradiol concentrations were slightly but significantly (P<0.05) higher in the ovarian (20±3 pg/ml) than the uterine vein (13±1 pg/ml) and, in turn, greater (P<0.03) than in peripheral blood (4.6±0.4 pg/ml). All samples of luteal tissue consisted exclusively of normal fully-differentiated cells and stained intensely for 3β-HSD. Isolated groups of placental cells also stained strongly for 3β-HSD. RNA for P450 (scc) and 3β-HSD was abundant in all corpora lutea and lower concentrations of P450 (scc) were present in the placenta. 3β-HSD RNA in the placenta was below the limit of detection. We conclude that the corpus luteum remains an important source of progesterone throughout pregnancy in reindeer but that the placenta is also steroidogenic.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Reproduction Science - Volume 85, Issues 1â2, January 2005, Pages 147-162
Journal: Animal Reproduction Science - Volume 85, Issues 1â2, January 2005, Pages 147-162
نویسندگان
P.F. Flood, N.J.C. Tyler, E.K. Read, M.J. Rodway, P.J. Chedrese,