PGE2 induces its own secretion in vitro by bovine 270-day placenta but not by 200-day placenta

Conley, 1987, Effect of prostaglandin F2α-induced luteolysis on in vivo and in vitro progesterone production by individual placentomes of cows, J Anim Sci, 65, 500, 10.2527/jas1987.652500x Weems, 1992, Effect of prostaglandin F2α (PGF2α) on sources of progesterone in hysterectomized, intact or ovarietmomized 90–100-day pregnant ewes, Prostaglandins, 43, 203, 10.1016/0090-6980(92)90090-G Weems, 1997, PGE1 or PGE2 not LH regulates secretion of progesterone in vitro by the 88–90 day ovine corpus luteum of pregnancy, Prostaglandins, 53, 337, 10.1016/S0090-6980(97)00037-3 Weems, 1995, Maternal recognition of pregnancy and maintenance of gestation in sheep, 277 Weems, 1997, Effect of luteinizing hormone (LH), PGE2, 8-Epi-PGE1, 8-Epi-PGE2, trichosanthin and pregnancy specific protein B (PSPB) on secretion of progesterone in vitro by corpora lutea (CL) from nonpregnant and pregnant cows, Prostaglandins, 55, 27, 10.1016/S0090-6980(98)00003-3 Weems, 1998, Effects of luteinizing hormone (LH), PGE2, 8-Epi-PGE1, 8-Epi-PGE2, 8-Epi-PGF2α, trichosanthin, and pregnancy specific protein B (PSPB) on secretion of prostaglandin E or PGF2α in vitro by corpora lutea (CL) from nonpregnant and pregnant cows, Prostaglandins, 55, 359, 10.1016/S0090-6980(98)00030-6 Weems, 1993, Effect of prostaglandin F2α on uterine or ovarian secretion of prostaglandins E and F2α in vivo in 90–100 day hysterectomized, intact or ovariectomized ewes, Prostaglandins, 46, 277, 10.1016/0090-6980(93)90010-5 Weems, 1992, Roles of prostaglandins (PG) F2a, E1 and E2, adenosine, oestradiol-17β, histone H-2A, and progesterone of conceptus, uterine or ovarian origin during early and mid-pregnancy in the ewe, Reprod Fert Dev, 4, 289, 10.1071/RD9920289 Hoyer G, Magness R, Huie M, Whysong G, Weems CW. Effects of prostaglandin E1 (PGE1) on estradiol-17β-induced luteolysis in the nonpregnant ewe. Prostaglandins Leukotr Essent Fatty Acid 195;37:203–14. Weems, 1985, Effects of prostaglandin E2 (PGE2) on estradiol-17β-induced luteolysis in the nonpregnant ewe, Prostaglandins, 29, 161, 10.1016/0090-6980(85)90199-6 Weems, 1985, Inhibition of an IUD-induced precocious luteolysis by prostaglandin E1 (PGE1) in sheep, Prostaglandins, 30, 573, 10.1016/0090-6980(85)90021-8 Weems, 1985, Prostaglandin E2 (PGE2) inhibits an IUD-induced premature luteolysis in sheep, Prostaglandins Leukot Med, 20, 267, 10.1016/0262-1746(85)90148-9 Weems, 1985, Effects of prostaglandins E1 or E2 (PGE1, PGE2) on luteal function and binding of luteinizing hormone in nonpregnant ewes, Prostaglandins, 29, 161, 10.1016/0090-6980(85)90199-6 Reynolds, 1981, Effects of PGE1 or PGE2 on PGF2α-induced luteolysis in nonbred ewes, Prostaglandins, 21, 957, 10.1016/0090-6980(81)90164-7 Magness, 1981, Effects of chronic ipsilateral or contralateral intrauterine infusion of Prostaglandin E2 (PGE2) on luteal function of unilaterally ovariectomized ewes, Prostaglandins Med, 6, 389, 10.1016/0161-4630(81)90071-9 Huie, 1981, Effect of chronic ipsilateral or contralateral intrauterine infusion of prostaglandin E1 (PGE1) on luteal function of unilaterally ovariectomized ewes, Prostaglandins, 21, 945, 10.1016/0090-6980(81)90163-5 Weems, 1985, Maternal recognition of pregnancy in ruminants In, 193 Ruder, 1988, Detection of pregnancy in sheep by radioimmunoassay of sera for pregnancy specific protein B, Theriogenology, 29, 905, 10.1016/0093-691X(88)90227-0 Xie, 1994, A novel glycoprotein of the aspartic proteinase family expressed in bovine placental trophectoderm, Biol Reprod, 51, 1145, 10.1095/biolreprod51.6.1145 Willard, 1995, Detection of fetal twins using a radioimmunoassay for pregnancy specific protein B, J Anim Sci, 73, 960, 10.2527/1995.734960x Hallford, 1990, Estimation of fetal numbers in ewes using ultrasound or serum progesterone on pregnancy specific protein B concentrating, J Anim Sci, 68, 1881 Weems, 1994, Effects of Prostaglandin F2α (PGF2α) on secretion of pregnancy specific protein B (PSPB) and placentome weights in intact or ovariectomized 90 to 100 day pregnant ewes, Prostaglandins, 48, 377, 10.1016/0090-6980(94)90004-3 Del Vecchio, 1995, Prostaglandin F2α, progesterone and oxytocin production by cultured bovine luteal cells treated with prostaglandin E2 and pregnancy specific protein B, Prostaglandins, 50, 137, 10.1016/0090-6980(95)00108-5 Del Vecchio, 1996, Bovine luteal cell production in vitro of prostaglandin E2, oxytocin and progesterone in response to pregnancy specific protein B and prostaglandin F2α, J Reprod Fertil, 107, 131, 10.1530/jrf.0.1070131 Weems, 1996, Effect of histone-H2A, platelet activating factor and pregnancy specific protein B (PSPB) on secretion of prostaglandins E and F2α (PGE, Chin J Physiol, 39, 1 Del Vecchio, 1990, Effect of pregnancy specific protein B on prostaglandin F2α and prostaglandin E release by day 16-perifused bovine endometrial tissue, Prostaglandins, 40, 271, 10.1016/0090-6980(90)90015-N Ford, 1975, Effects of estradiol-17β and progesterone on prostaglandin F in sheep uteri and uterine venous plasma, J Anim Sci, 41, 1407, 10.2527/jas1975.4151407x Fogwell, 1978, Secretion of steroids and induced luteal regression in beef heifers, J Anim Sci, 46, 1718, 10.2527/jas1978.4661718x Wang, 1981, Prostaglandin E and F2α levels in plasma and amniotic fluid during mid-trimester abortion induced by trichosanthin, Prostaglandins, 22, 289, 10.1016/0090-6980(81)90043-5 Weems, 1994, Effects of prostaglandin F2α (PGF2α) on secretion of estradiol-17b and cortisol in 90 to 100 day hysterectomized, intact and ovariectomized pregnant ewes, Prostaglandins, 48, 139, 10.1016/0090-6980(94)90015-9 Steel, 1990 Gross, 1988, In vitro steroid synthesis by the placenta in late gestation and at parturition, J Reprod Fertil, 83, 565, 10.1530/jrf.0.0830565 De La Llosa-Hermier, 1991, Evidence for modulation of progesterone secretion by calcium and protein kinase C activators in ovine chorionic cells, Placenta, 12, 511, 10.1016/0143-4004(91)90027-D Niswender, 1994, Luteal function, Biol Reprod, 50, 239, 10.1095/biolreprod50.2.239 Orlicky, 1996, Negative regulatory activity of a prostaglandin F2α receptor associated protein (FPRP), Prostaglandins Leukotr Essent Fatty Acids, 54, 249, 10.1016/S0952-3278(96)90055-1 Weems YS. Effects of Prostaglandin F2α or Trilostane on Pregnancy in 90 to 100 Day Pregnant Sheep. Dissertation. University of Hawaii, 1994, 352 pages. Smith, 1992, Prostanoid biosynthesis and mechanisms of action, Am J Physiol, 263, F181 Thorburn, 1991, The placenta, prostaglandins and parturition. A review, Reprod Fertil Dev, 3, 277, 10.1071/RD9910277 Word, 1992, Contractile effects of prostaglandins, oxytocin and endothelin-1 in human myometrium in vitro: Refractoriness of myometrial tissue of pregnant women to prostaglandins E2 and F2α, J Clin Endocrinol Metab, 75, 1027, 10.1210/jc.75.4.1027 Cox, 1996, Angiotensin II receptor characteristics and subtype expression in uterine arteries and myometrium during pregnancy, J Clin Endocrinol Metab, 81, 49, 10.1210/jc.81.1.49 Cox, 1993, Myometrial angiotensin receptor subtypes changes during ovine pregnancy, J Clin Invest, 92, 2240, 10.1172/JCI116827 Ipson, 1996, Alterations in myometrial stress and the puerpeium, Amer J Physiol, 272, R446 Rosenfeld, 1993, Myosin heavy chain isoforms are regulated differently in myometrium and uterine artery smooth muscle in ovine pregnancy and the puerperium, Biophys J, 64, A34 Magness, 1994, Angiotensin II metabolic clearance rate and pressor responses in nonpregnant and pregnant women, Amer J Obstet Gynoecol, 171, 668, 10.1016/0002-9378(94)90080-9 Magness, 1996, Endothelium-derived vasodilator production by ovine uterine and systemic arteries. I. Effects of angiotensin II on prostacyclin and nitric oxide in pregnancy, Am J Physiol, 270, H1914 Morrow, 1990, Noncyclooxygenase oxidative formation of a series of novel prostaglandins, Analytical Biochemistry, 184, 1, 10.1016/0003-2697(90)90002-Q Beaver, 1992, Ovarian and uterine prostaglandin E2-9-Keto reductase activity in cyclic and pregnant ewes, Prostaglandins, 44, 37, 10.1016/0090-6980(92)90105-3 Ottobre, 1984, Aspects of regulation of uterine secretion of prostaglandins during the estrous cycle and early pregnancy, Anim Reprod Sci, 7, 75, 10.1016/0378-4320(84)90029-0 Vincent DL, Inskeep EK. Role of progesterone in regulating uteroovarian venous concentrations of PGF2α and PGE2 during the estrous cycle and early pregnancy in ewes. Prostaglandins 1986;31:715–18. International Conference on Phospholipase A2Berlin, May 26–29, 1999organized by:Santosh Nigam, Free University Berlin, Universitätsklinikum Benjamin Franklin, Berlin, Germany Edward A. Dennis, Univ. of California—San Diego, La Jolla, CA, USA Topics: Structure, regulation and function / Functional role in acute and chronic inflammation / Inhibitors / Cell proliferation, differentiation and programmed cell death / Cell signaling / Platelet-activating factor-acetylhydrolase / Interaction with eicosanoid synthesising enzymes Invited Speakers: N. Bazan (New Orleans), G. Bereziat (Paris), J. Bonventre (Boston), P. Borgeat (Quebéc), W. Cho (Chicago), J.D. Clark (Boston), B. Dijstra (Utrecht), M. Gelb (Washington DC), K. Inoue (Tokyo), B. Johanssen (Trondheim), I. Kudo (Tokyo), M. Lazdunski (Valbonne), L. Marshall (King of Prussia), E. Mihelich (Indianapolis), W. Molenaar (Amsterdam), S.M. Prescott (Salt Lake City), T. Shimizu (Tokyo), D. Stafforini (Salt Lake City), J. Tischfield (New Jersey), L. Tjoelker (Seattle), H. Van den Bosch (Utrecht), S. Yedgar (Jerusalem) Dead Line: 1st April 1999 For further information and on line registration see our home page (http://userpage.fu-berlin.de/ nigam/) or contact Dr. S. Nigam, Tel/Fax: +49-30-8445 2467; e-mail:[email protected] or Dr. E.A. Dennis, Tel: +1-619-534 3055, Fax: +1-619-534 7390; e-mail: [email protected]