Document Detail


Mitotic activity and its 24-hour rhythm in the ovarian follicles during the estrous cycle of a wild rat, Bandicota bengalensis.
MedLine Citation:
PMID:  4061039     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Mitotic activity in ovarian follicles was studied in relation to the size of the follicles during a 24-hour period (10.00, 16.00, 22.00 and 04.00 h) throughout the estrous cycle of the wild bandicoot rat (Bandicota bengalensis) to ascertain the cell proliferation rate and its 24-hour rhythm in the follicular tissue. In the bandicoot ovary, mitotic activity in the granulosa and thecal cells was highest in the follicles ranging from 201 to 400 micron in diameter. During the estrous cycle, mitotic activity of the granulosa cells was highest at estrus in follicles less than 601 micron, and at diestrus in follicles greater than 600 micron; while the mitotic trough was at proestrus in all the follicles. Thecal mitosis was significantly lower than mitosis of the granulosa cells. In most of the follicles, mitotic activity in the thecal cells was highest at diestrus and lowest at metestrus. In both the granulosa and thecal cells, the timing of mitotic peaks and troughs varied according to the size of the follicles and the stages of the estrous cycle. In the granulosa cells mitotic peaks were maximal in the daytime (10.00 h, 16.00 h) and in some cases at night (04.00 h); and mitotic troughs were primarily during the night (22.00 h, 04.00 h) and in some cases in the day (10.00 h). In the thecal cells, however, mitotic activity in most of the follicles was distinctly higher in the daytime (16.00 h) than at night (22.00 h, i.e., evening). Thus, a prominent 24-hour mitotic rhythm was noticed in the ovarian follicles of the bandicoot rat.
Authors:
A Sahu
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta anatomica     Volume:  123     ISSN:  0001-5180     ISO Abbreviation:  Acta Anat (Basel)     Publication Date:  1985  
Date Detail:
Created Date:  1985-12-09     Completed Date:  1985-12-09     Revised Date:  2007-07-02    
Medline Journal Info:
Nlm Unique ID:  0370272     Medline TA:  Acta Anat (Basel)     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  195-200     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Circadian Rhythm*
Diestrus
Estrus*
Female
Granulosa Cells / cytology
Metestrus
Mitosis*
Muridae
Ovarian Follicle / cytology*
Proestrus
Rats
Theca Cells / cytology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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