PGE1, or PGE2 not LH regulates secretion of progesterone in vitro by the 88-90 day ovine corpus luteum of pregnancy
1997
Secretion of progesterone in vitro by mature day 8 ovine corpora lutea (CL) of the estrous cycle was increased linearly by ovine LH (1, 10 and 100 ng/ml) or prostaglandin E2 (PGE2) (1, 10 and 100 ng/ml) in a dose dependent manner (P less than or equal to 0.05). Progesterone secretion in in vitro by 88-90 day ovine CL of pregnancy was not affected P greater than or equal to 0.05 by LH (1, 10 and 100 ng/ml) while prostaglandin E1 (PGE1) (1, 10 and 100 ng/ml) increased (P less than or equal to 0.05) secretion of progesterone in a dose dependent manner and PGE2 (1, 10 and 100 ng/ml) increased (P less than or equal to 0.05) secretion of progesterone only at the 100 ng/ml dose. Day 8 ovine CL of the estrous cycle did not secrete (P greater than or equal to 0.05) detectable quantities of prostaglandin F2 alpha (PGF2 alpha) or prostaglandin E (PGE) while 88-90 day ovine CL of pregnancy secrete PGE (P less than or equal to 0.05) but not PGF2 alpha (P greater than or equal to 0.05). Regulation of PGE secretion by 88-90 day ovine CL of pregnancy may be via pregnancy specific protein B (PSPB), which increased (P less than or equal to 0.05) PGE and progesterone but not PGF2 alpha (P greater than or equal to 0.05) secretion. Secretion of progesterone by CL of 88-90 days of pregnancy was not affected by IGF1, IGF2, PAF-16, PAF-18, oxytocin, PGI2, PGD2 or leukotriene C4 (P greater than or equal to 0.05). It is concluded that PGE1 or PGE2 but not LH regulates secretion of progesterone in vitro by 88-90 day ovine CL of pregnancy. In addition, it is concluded that 88-90 day ovine CL of pregnancy secretes it's own luteotropin, which is PGE. Secretion of PGE by ovine CL of pregnancy may be regulated by PSPB.
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