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KMID : 0438219720090020129
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Korea University Medical Journal
1972 Volume.9 No. 2 p.129 ~ p.144
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Histological Study of Mitotic Activity in the Intestinal Epithelium of Various Vertebrates
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Abstract
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For the purpose of making, from the phylogenic point of view, a study of the rate of mitosis related to cell renewal in the epithelium of intestinal mucosa, the author chose the duodenum, ileum and colon of animals in various classes- eleven species of mammals and 11 species of bird- and fixed in neutral formol and Bouin solution. Paraffin sections of 5 microns were made and triple stained with basic fuchsin and picro-indigo carmine of Hall(1970).
For counting the number of mitotic cells, 20 clean-dissected longitudinal sections of the crypt were chosen and the total number of epithelial cells constituting the intestinal gland were counted and, furthermore, the number of cells in the process of mitosis were counted. The average number of cells per crypt was set as the mitotic index and the frequencies in the individual species of animals were compared.
1. Of the mammals, the animals whose mitotic indices were comparatively high were Korean moles, guinea pigs, Manchurian chipmunks, and rabbits, and those low indices were dogs, cats, and pigs. Indian pipstrellers, Korean hedgehogs, Korean cattle, and white rats showed intermediate indices.
2. Among birds, the indices were comparatively high in black-naped orides, Ussurian tree-sparrows, Japanese domestic ducks, Korean wood-owls, fowls, and Japanese quails, and low indices were found in Eastern turtle-doves, Brandt´s jays, Japanese grosbeaks, and common Indian king-fishers. Korean magpies had an index falling between these 2 groups.
3. In mammals, the portion-by-portion mitoic index was, in general, highest in the duodenum and lowest in the colon, the index of ileum coming between these two. However, Japanese domestic ducks and Korean cattle were exceptions, showing comparatively high index in the colon.
4. In birds, the mitotic index by portion of intestines was, in general, high in the upper portion of the small intestine and became lower as it becomes nearer to the large intestine.
5. On the whole, in mammals and birds, the number of mitotic cells increased or decreased in proportion to the number of epithelial cells of the intestinal gland, but the mitotic index´ was not proportional to the number of epithelial cells.
6. Finally, the relation between mitotic rate and eating habit revealed that in the case of mammals, the rate was on the whole, comparatively high in herbivorous and carnivorous animals and relatively low in omnivorous animals, but in the case of birds, no significant relation was found between mitotic rate and eating habit.
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