June 2014 (No. 2)
Different expression of PGE synthase, PGF receptor, TNF, Fas and oxytocin in the bovine corpus luteum of the estrous cycle and pregnancy
R. Sakumoto*, K-G. Hayashi, T. Takahashi 1
Animal Physiology Research Unit, National Institute of Agrobiological Sciences, Ibaraki 305-0901, Japan
Functional differences between the corpus luteum (CL) of pregnancy and CL of the cycle in cows were examined. Messenger RNA and protein levels of prostaglandin (PG) E synthase (PGES), PGF2α receptor (PGFR), tumor necrosis factor-α (TNF) and Fas were found to be higher in the CL of pregnancy than in CL of the cycle. Oxytocin (OT) mRNA and protein levels were lower in the CL of pregnancy. Messenger RNA levels of progesterone receptor (PR), luteinizing hormone receptor (LHR), PGE2 receptor (PGER), PGF synthase (PGFS), TNF receptor type I (TNFRI) and TNF receptor type II (TNFRII) did not differ between the cycle and pregnancy. PGE2 and PGF2α production by cultured bovine endometrial tissues was decreased by a supernatant derived from the homogenized CL of pregnancy but not by that of the CL of the cycle, suggesting that specific substances in the CL of pregnancy affect endometrial PG production in cows. Collectively, PGES, PGFR, TNF, Fas or OT may contribute to differences between the CL of pregnancy and CL of the estrous cycle in cows.
Reproductive Biology 2014 14 2: 115-121.
* Corresponding author: Tel.: +81 29 838 8633; fax: +81 29 838 8610. E-mail address: firstname.lastname@example.org
1 Present address: Laboratory of Theriogenology, Faculty of Agriculture, Iwate University, Iwate 020-8550, Japan.