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Fine structural and cytochemical analysis of the processes of cell death of oocytes in atretic follicles in new born and prepubertal rats

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The process of cell death of oocytes was studied in atretic ovarian follicles of rats aged from 1 to 28 days using light and electron microscope and cytochemical methods. These methods were TUNEL procedure for DNA breaks, active caspase-3 and lysosome-associated membrane protein 1 (LAMP-1) immunolocalizations. The structural features of the process of oocyte death are mainly characterized by the presence of abundant clear vacuoles and autophagosomes, as well as by the absence of large clumps of compact chromatin associated to the nuclear envelope and apoptotic bodies. These features are common to oocytes in all types of follicles studied. Cytochemical features consisting in positive reactions to TUNEL method, active caspase-3 and LAMP-1 immunolocalizations, are common to the cell death of oocytes in all types of follicles. Particular features of the process of cell death of oocytes are found in different types of follicles. Two morphological patterns of cell death occur in pre-follicular oocytes of the new born and in primordial follicles in 1 to 5 days old rats. One is distinguished by clear nucleoli and moderate compaction of chromatin in clumps frequently resembling meiotic bivalents. The second pattern is characterized by nucleolar condensation and by the absence of compact chromatin. The process of cell death of oocytes in antral follicles is characterized by ribonucleoprotein ribbon-like cytoplasmic structures, pseudo-segmentation, and loss of contact with granulosa cells.

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Correspondence to G. H. Vázquez-Nin.

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Ortiz, R., Echeverría, O.M., Salgado, R. et al. Fine structural and cytochemical analysis of the processes of cell death of oocytes in atretic follicles in new born and prepubertal rats. Apoptosis 11, 25–37 (2006). https://doi.org/10.1007/s10495-005-3347-0

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