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a MRC Reproductive Biology Unit, Edinburgh, EH3 9ET, United Kingdom
b Department of Pathology, University of Edinburgh, Edinburgh, EH3 9ET, United Kingdom
c Department of Anatomy, Monash University, Clayton, Melbourne, Victoria 3168, Australia
Morphological changes in the corpus luteum following natural and induced luteolysis in the marmoset were investigated by light and electron microscopy. Functional corpora lutea were studied in the mid and late luteal phase, naturally regressed corpora lutea in the early and late follicular phase, and corpora lutea induced to regress by administration of GnRH antagonist or prostaglandin F2
analogue in the midluteal phase. Natural luteolysis was associated with lutein cell atrophy, condensation of cytoplasmic inclusions and organelles, and accumulation of lipid. GnRH antagonist treatment resulted in aggregations of smooth membranes and myelin-like bodies in the cytoplasm of the lutein cells together with complex aggregations of degenerative cells. After prostaglandin treatment, the lutein cells contained numerous small and large vesicles; as the degenerative changes advanced, these vesicles coalesced into alveolar-type vacuoles, and nuclei involuted. These results show that in the marmoset, natural luteolysis and the two luteolytic treatments reveal different forms of luteal degeneration and cell death, none of which fit the ultrastructural criteria for apoptosis. More emphasis needs to be placed on understanding these predominant nonapoptotic forms of cell death in order to elucidate the process of luteolysis in the primate.
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