Human Reproduction, Vol. 15, No. 10, 2119-2128,
October 2000
© 2000 European Society of Human Reproduction and Embryology
Different patterns of structural luteolysis in the human corpus luteum of menstruation
1 Departments of Pathology and 2 Cell Biology, Physiology and Immunology, Faculty of Medicine, University of Córdoba, Córdoba, Spain
Structural luteolysis is a complex process responsible for the elimination of the corpus luteum (CL). The aim of this study was to analyse the luteolytic process of the CL of menstruation. For this, we have morphologically studied 654 ovaries from 340 cycling women. Apoptotic cells were observed almost exclusively during the perimenstrual period and were extremely scarce at advanced stages of involution. Steroidogenic luteal cells surviving to the perimenstrual apoptotic wave underwent characteristic degenerative changes, consisting of intense cytoplasmic vacuolation, expression of macrophage markers and accumulation of lipofuscin pigment, and they persisted for long periods of time. Accumulation of corpora albicantia (CA) was observed in only 25% of a subset of 168 women, whereas 28% showed involuting CL without hyalinization, consisting of clusters of pigment-filled cells, and 46.4% showed ovaries with a mixture of CA and involuting CL without hyalinization or involuting CL with intermediate features. Evolution of the CL towards CA seemed to be related to the presence of a large, blood-filled cavity. The data from this study suggested that different patterns of structural luteolysis exist during CL involution, and that the final fate of the involuting CL is dependent on the presence of a large, central, blood-filled cavity.
Key words: apoptosis/cell death/corpus albicans/corpus luteum/structural luteolysis
3 To whom correspondence should be addressed at: Department of Cell Biology, Physiology and Immunology, Faculty of Medicine, University of Córdoba, 14004-Córdoba, Spain.E-mail: fi1begac{at}lucano.uco.es
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