Structural changes of uterine tube epithelium in piglets during the firsts months of life
1998
Suuroja, T. (Estonian Agricultural University, Tartu (Estonia))
The postnatal differentiation of epithelial cells from piglets uterine tube during the first 2 months of life was studied. Typical elements of the ultrastructure of ciliated cells were observable in the early postnatal stage. The structural development of secretory and ciliated cells was different. Typical secretory cells with species specific secrete granules appeared in about one month old piglets. In epithelium specimens taken from 36 hours, 3,4 and 6 days old piglets have numerous differentiating cells: the differentiating cells were characterised by an increased number of polyribosomal complexes and the development of the granular endoplasmic reticulum and Golgi apparatus. Typical were cytoplasmic protrusions. The differentiation of uterine tube epithelium in the 1-2 months old piglets was also incomplete. Simultaneously with typical secretory cells various non-ciliated differentiating cells were also present. Pear-shaped apical parts of these cells bulged into uterine tube lumen. The cytoplasms of these cells have many vacuoles, cisterns of endoplasmic reticulum with moderate widths, mitochondria and plyribosomes. Their nuclei have irregularly shaped protrusions and they contained marginally located condensed chromatin. The results of our investigation prove, that differentiation of uterine tube epithelial cells in 1-2 months old piglets into secretory and ciliated cells has not finally terminated. The eventual influence of female sex hormones on the postnatal development of uterine tube epithelial cells is discussed
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