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Estimation of mitotic rate and mitotic duration in the internal enamel epithelium of the rat maxillary incisor using a colchicine an alkaloid from Colchicum autumnale technique


Estimation of mitotic rate and mitotic duration in the internal enamel epithelium of the rat maxillary incisor using a colchicine an alkaloid from Colchicum autumnale technique



Arch Oral Biol 11(8): 803-814



Mitotic rate and mitotic duration in the internal enamel epithelium of the rat maxillary incisor were estimated using a colchicine technique. The mitotic rate was 2.33 percent of cells dividing/hour and the mitotic duration was 39 min. as estimated from the means of the percentage of cells in mitosis averaged throughout the proliferative zone of this tissue. The lag time intervening Between the drug administration and arrest of all metaphases was approximately 18 min. Regional differences were found in mitotic rates but not in the mitotic durations. It is suggested that the mitotic rates of the cells in the internal enamel epithelium might differ according to the location of the cells but the mitotic durations remain fairly constant. The proportions of prophases, metaphases and ana-telophases in the control rats were approximately 1.0:1.1: 1.8. The mitotic duration, 39 min., was divided into these proportions. Thus the duration of prophase, metaphase and ana-telophases were roughly estimated to be 10, 11 and 18 min. respectively.

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Accession: 024631959

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