The possible mode of action of iproniazid. I. Differential luteolytic effect of iproniazid before and after the establishment of placental adolescence

Iproniazid, a very specific monoamine oxidase inhibitor, at a dose level of 200 mg/kg body weight induced luteolysis and caused lysis of deciduomata as well as resorption of the established embryos. Exogenous replacement of prolactin, a most consistent stimulant of the endocrine functioning of corpus luteum, or progesterone absolutely reversed the adversity developed following iproniazid injection. Moreover, failure of iproniazid even at a higher dose level in the deviation of the normal sequence of pregnancy after the establishment of placental adolescence strongly tempting to suggest that iproniazid could only show its luteolytic effect when the hypothalamic-pituitary complex is exclusively involved in the maintennance of pregnancy.

The possible mode of action of prostaglandins: VIII - cortisone, reserpine and the reversal of the antifertility efficacy of prostaglandin E1 in rats

A single injection of prostaglandin F1 (PGE1) of 5 mg/kg body weight on Lay 13 of pregnancy caused a consistent luteolysis and resorption of fetuses in rats by Day 20. A concomitant regimen of cortisone, a consistent blocker of nonspecific stresses or reserpine, an adrenergic nerve blocking agent as well as a specific inhibitor of GRF and PIF, concurrently with PGE1 consistently effective in preventing the deleterious efficacy of PGE1 and maintained the growth of the fetuses, placentae, ovaries and corpora lutea as healthy as recorded in the controls. On the basis of experimental documentation it is believed that the PGE1-caused fetal demise is possibly due to a break up of an appropriate hormonal synchronization rather than an over stimulation of uterine smooth musculature.

Constituents of Pleiospermium alatum: Alatamide and N-benzoyltyramine methyl ether

Two alkamides have been isolated from the leaves of Pleiospermium alatum (Rutaceae). On the basis of spectral and chemical evidence the new alkamide, designated alatamide, has been identified as N-(E)-(p- methoxystyryl)benzamide (1). The second compound has been characterized as N-benzoyltyramine methyl ether (2) by hydrolysis experiments and synthesis.

Possible mode of action of clomiphene

Clomiphene, a synthetic non-steroidal agent, when injected into rats at a dose level of 3.0 mg/kg b. w. on days 5, 7 and 9 of pseudopregnancy causes termination of decidual growth. Moreover, its administration on days 12, 14, 16 and 18 of pregnancy causes death and resorption of the foetuses leaving regressing placentae at the sites of their attachment in the uteri. Luteolysis and ovarian poly-follicular conditions were also evident in both instances. Concomitant administration of prolactin or progesterone along with the clomiphene consistently prevented the interruption of clomiphene-induced lysis of deciduoma, gestation and other associated ovarian abnormalities. It is suggested that the abnormal development of the follicular apparatus possibly caused by the clomipheneinduced endogenous FSH during pseudopregnancy or pregnancy is the most likely explanation for the termination of decidual growth or gestation in rats.