Summary
L-fucose-3H was injected intravenously into mice which were killed at several time intervals after injection and semi-thin sections of their ovaries were processed for radioautography and analysed quantitatively. At the same time the specific activity of serum glycoproteins was determined. Glycoprotein biosynthesis was demonstrated in the oocytes, granulosa and stromal cells. The silver grain density of the follicular fluid in large follicles reached a peak at 4 h, remained high at 8 h after injection and decreased steadily at the subsequent intervals. It was demonstrated that the labeling pattern of the follicular fluid depends on the secretory activity of the granulosa cells and also on the specific activity of serum glycoproteins. The collapsed zonae pellucidae which represent the highest degree of follicular atresia are able to take up glycoprotein macromolecules. Based on this finding and also on the labeling pattern of the large follicles it was shown that there is very little synthesis of specific glycoproteins for the zona pellucida in large follicles. A more specific labeling of the zona pellucida occurred in the medium follicles. Following the growth of these follicles having a previously labeled zona pellucida, it was demonstrated that this extracellular structure is secreted by the oocyte.
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Haddad, A., Nagai, M.E.T. Radioautographic study of glycoprotein biosynthesis and renewal in the ovarian follicles of mice and the origin of the zona pellucida. Cell Tissue Res. 177, 347–369 (1977). https://doi.org/10.1007/BF00220310
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DOI: https://doi.org/10.1007/BF00220310