Results 191 to 200 of about 8,097 (247)

Cellular Mechanisms Involved in Luteolysis

1979
Regression of the mammalian corpus luteum is commonly thought to involve autophagy (cellular self-digestion) or heterophagy (removal of cells by macrophages), or both. However, few studies have focused on these mechanisms, and their actual importance in luteolysis thus remains uncertain.
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Effect of mifepristone on inhibition of ovulation and induction of luteolysis

Human Reproduction, 1994
Mifepristone administration to women in the mid- or late follicular phase delays the luteinizing hormone (LH) surge and prolongs the follicular phase. Since the resumption of follicular growth commences following mifepristone cessation, the drug must be given either continuously or at repeated intervals in order to block ovulation.
I M, Spitz, H B, Croxatto, P, Lähteenmäki, O, Heikinheimo, C W, Bardin   +4 more
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Luteolysis in the hamster: Abrogation by gonadotropin and prolactin pretreatment

Prostaglandins, 1981
The luteolysis which terminated pseudopregnancy (PSP) in superovulated hamsters was studied. Spontaneous luteolysis occurred before 1100 on Day 7 of PSP and was characterized by a rapid decline in circulating progesterone levels. Luteolysis induced by prostaglandin F2 alpha (PGF2 alpha) on Day 5 of PSP displayed a similar rapid reduction in ...
K H, Harris, B D, Murphy
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A possible role for testosterone during luteolysis in the ewe

Research in Veterinary Science, 1988
Increased peripheral plasma concentrations of testosterone were detected at the commencement of luteolysis and at oestrus in sheep. Daily subcutaneous administration of spironolactone (10 mg kg-1) between days 10 and 16 of the oestrous cycle suppressed testosterone secretion and delayed luteolysis and oestrus.
R G, Cooke, K M, Benhaj
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Control of pregnancy, parturition and luteolysis in marsupials

Reproduction, Fertility and Development, 1990
In most eutherian species the function of the corpus luteum (CL) is influenced by extrinsic factors and it is subordinate to the pituitary, placenta, or uterus. In contrast, in marsupials the CL is relatively autonomous. Although the pituitary is essential for the formation of the CL, thereafter the secretory activity of the CL is independent of ...
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Prostaglandins and post-abortion luteolysis in early pregnancy

Prostaglandins, 1975
This study was undertaken to determine if post-abortion luteolysis in early pregnancy could be accelerated by the administration of 15(S)15-methyl-PGF2alpha(15-me-PGF2alpha) or delayed following pretreatment with indomethacin. Thirty-nine women were divided into four groups: 7 women were given 400mug 15-me-PGF2alpha extra-amniotically one hour prior to
A, Leader, M, Bygdeman, S Z, Cekan, E, Diczfalusy, R, Guerrero, J N, Martin, N, Wiqvist   +6 more
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Calcium: A Cellular Mediator of Luteolysis

1984
Regression of the corpus luteum with the consequent loss of ovarian progesterone secretion appears to be an induced response which is necessary for the re-occurrence of ovulation. Conversely, prevention of corpus luteum regression is essential for the continuation of pregnancy.
Harold R. Behrman, Peter J. Albert, Steven D. Gore, Laneta J. Dorflinger   +3 more
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Perforin Expression in Human Cell-Mediated Luteolysis

International Journal of Gynecological Pathology, 1995
After ovulation and in the absence of fertilization, the human corpus luteum regresses in an orderly sequence of morphological changes. This study demonstrated that luteal regression involved progressive infiltration of lymphocytes and macrophages.
A, Hameed, W M, Fox, R J, Kurman, R H, Hruban, E R, Podack   +4 more
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A 40-year odyssey into the mysteries of equine luteolysis

Theriogenology, 2009
Variation is the principal barrier to progress in unraveling the complexities of biological mechanisms. The resulting slow research progress is well illustrated in the chronology of events in elucidating the mechanism for regression of the corpus luteum (luteolysis) during the equine estrous cycle.
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Enclomiphene induces luteolysis in the nonpregnant guinea pig

Experientia, 1989
The effect of two antiestrogens, enclomiphene and tamoxifen, on luteal function in the guinea pig was compared to that of estradiol, a known luteolysin. Enclomiphene caused premature luteolysis when administered during the early or mid-luteal phase of the cycle, but was not as potent as estradiol. Tamoxifen had no effect.
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