Cortisol, progesterone and estradiol seCretion in vitro in postpartum plaCental Cotyledons of ewes that gave birth to single or twin lambs
نویسنده
چکیده
the level of fetal hypothalamic-pituitary-adrenal (hpa) axis activity is determined by gestation length, which can be influenced by an adverse intrauterine and/or maternal environment and also by litter size. this study was designed to determine whether steroid hormone secretion by ewe placenta is related to single or twin pregnancy. placentas expelled from twelve postpartum polish longwool sheep were used. six of them gave birth to a single lamb (spC) and the other six delivered twin lambs (tpC). Cotyledons were removed from the placenta and their slices were incubated in tCm-199 medium supplemented with 10% fsC and antibiotics under an atmosphere of 5% Co2 at 37°C. after incubation of placental explants, the level of progesterone (p4), estradiol (e2), and cortisol was measured in medium by ria. gestation length in the spC and tpC ewes was 145.2±0.75 and 142.8±0.4 days, respectively. after 1 and 3 h of incubation, higher concentration of p4, e2 (P≤0.01) and cortisol (P≤0.05) was observed in the TPC compared to the SPC group, in which mean gestation length was 2.34 days longer. the observed changes indicate that in the ewe, the in vitro secretion of placental steroid hormones is related to the length of pregnancy.
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تاریخ انتشار 2011