Annual mitotic activity in the intestinal epithelium of the musselCrenomytilus grayanus

Annual mitotic activity in the intestinal epithelium of the musselCrenomytilus grayanus The seasonal dynamics of cell reproduction in the intestinal epithelium of the musselCrenomytilus grayanus are described in detail. Mitotic indices in the intestinal epithelium varied throughout the year from 0.005 to 0.26% (averaged data) and from 0.003 to 0.37% (individual data). Cyclic seasonal changes were found in the mussel’s intestinal epithelium. In general, the average values of mitotic activity in the intestinal epithelium were low (the mitotic index was 0.13%); there was a rise in activity in late April–June and September and a decline in July–August and especially in January–March. The winter-early spring period was characterized by a profound inhibition of cell reproduction and the transition of cells to the resting state. An outburst of proliferation occurred in the spring, due to a manifold increase in the number of cells in the mitotic cycle. The musselC. grayanus may be a good model for the study of the two extreme states of proliferation and their alternation in marine animals in nature. The diel dynamics of mitotic activity in the intestinal epithelium were followed during the most active growth period (May). The mitotic index (MI) varied during the day within a narrow range, deviating from the daily average value by no more than one third; no pronounced diel rhythm was found. Optimum water temperatures for cell reproduction ranged from 5 to 18°C. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Annual mitotic activity in the intestinal epithelium of the musselCrenomytilus grayanus

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Publisher
Nauka/Interperiodica
Copyright
Copyright © 2000 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Freshwater & Marine Ecology; Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1007/BF02759478
Publisher site
See Article on Publisher Site

Abstract

The seasonal dynamics of cell reproduction in the intestinal epithelium of the musselCrenomytilus grayanus are described in detail. Mitotic indices in the intestinal epithelium varied throughout the year from 0.005 to 0.26% (averaged data) and from 0.003 to 0.37% (individual data). Cyclic seasonal changes were found in the mussel’s intestinal epithelium. In general, the average values of mitotic activity in the intestinal epithelium were low (the mitotic index was 0.13%); there was a rise in activity in late April–June and September and a decline in July–August and especially in January–March. The winter-early spring period was characterized by a profound inhibition of cell reproduction and the transition of cells to the resting state. An outburst of proliferation occurred in the spring, due to a manifold increase in the number of cells in the mitotic cycle. The musselC. grayanus may be a good model for the study of the two extreme states of proliferation and their alternation in marine animals in nature. The diel dynamics of mitotic activity in the intestinal epithelium were followed during the most active growth period (May). The mitotic index (MI) varied during the day within a narrow range, deviating from the daily average value by no more than one third; no pronounced diel rhythm was found. Optimum water temperatures for cell reproduction ranged from 5 to 18°C.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Nov 18, 2007

References

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