The length of the luteal phase in pregnant queens, accompanied by elevated progesterone ([P.sub.4]) levels, is assumed to be partially driven by luteotrophic
and luteolytic factors of placental origin .
influence of early bovine embryos and the relationship between plasma progesterone concentrations and embryo survival.
In rodents and rabbits, estradiol appears to be the major luteotrophic hormone.
The combination of these effects on luteal vasculature causes a marked reduction in blood flow to the gland and deprives it of vital nutrients (energy substrates and oxygen), substrates for progesterone synthesis (LDL), and luteotrophic support (LH).
Apparently, the luteotrophic effect of LEP might be reverted by the antiluteotrophic and/or luteolytic role of GHR.
Thus, the present treatment with LEP 200 ng/mL may initiate an oxidative response, which opposes the luteotrophic dose of 5 ng/mL.
CSH1 are not luteotrophic
or antiluteolytic when introduced into the uterine lumen or into the maternal circulation in ewes (Spencer et al., 1999).
How would you distinguish between a maternal recognition of pregnancy signal that is antiluteolytic and one that is luteotrophic
This suggests the existence of a luteotrophic
intraluteal loop, where TNF increases the VEGF production by equine luteal cells, and, in turn, VEGF synergically acts on TNF secretion.
Estrogen plays a key role in redirection of endometrial PGF2a secretion from the uterine vasculature to the uterine lumen to maintain corpus luteum (CL) in the ovary (luteotrophic
), thereby secretion of progesterone from CL is sustained throughout pregnancy.