Prolongation of Pseudopregnancy of Rats by Gonadotropins Implanted in the Ovarian Bursae¹²

Is crab duplex-specific nuclease a member of the Serratia family of non-specific nucleases?

“…DNAse activity was measured using the modified Kunitz assay (Kunitz, 1950;Liao et al, 1974) in 1 × reaction buffer (7 mM MgCl 2 , 50 mM Tris-HCl, pH 8.0) containing 400 µM calf thymus DNA. Substrate preference was examined as described earlier (Shagin et al, 2002).…”

Utero-ovarian relationships in placental mammals : role of uterus and embryo in the regulation of progesterone secretion by the corpus luteum. A review

“…In rabbit, embryonic production of an LH-like chorionic gonadotropin has been observed even before implantation ; unfortunately, nothing is known about its existence during pregnancy Fujimoto et al, 1975 ;Asch et al, 1979 (Hanson, Powell and Stevens, 1971). In rat, LH implants in the ovary only prolong pseudopregnancy by several days, while the corpus luteum is responsible for the circulating progesterone level throughout pregnancy, even though the foetoplacental units produces a little progesterone at the end of pregnancy (Liao, Pattison and Chen, 1974 ;Legrand et al, 1979).…”

“…In rat, PGE's are abundantly produced when the uterus is decidualized, especially if an embryo is present during at least the first half of pregnancy (Anteby et al, 1975). However, LH-prolactin association is no more effective than LH alone in prolonging the length of pseudopregnancy (Liao, Pattison and Chen, 1974). It may thus be that decidual tissue acts by producing both a « prolactin-like » hormone and PGE.…”