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Toxicologic Pathology
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Article

Ovarian Follicle Counts Using Proliferating Cell Nuclear Antigen (PCNA) and Semi-Automated Image Analysis in Rats

Catherine A. Picut, Cynthia L. Swanson*, Kathryn L. Scully, Vern C. Roseman, Regina F. Parker, and Amera K. Remick

* To whom correspondence should be addressed. E-mail: cswanson{at}biotechnics-inc.com.


  Abstract
Ovarian follicle counting is a method to assess ovarian toxicity in reproductive toxicity studies in rats. Although ovarian follicle counting has been traditionally performed manually on hematoxylin and eosin (H&E)-stained sections, the use of immunohistochemical methods, including human cytochrome P450 1B1 (CYP1B1) and proliferating cell nuclear antigen (PCNA), have been used to enhance the visibility of the primordial and primary follicles to facilitate manual counting. In this study, serial sections from both ovaries from ten 3-month-old female Sprague Dawley rats were stained using routine H&E and immunohistochemistry for PCNA. Counting of primordial and primary follicles was performed manually using these two stains and by semi-automated image analysis of PCNA-stained slides. Although manual counting of PCNA-stained slides is preferable to manual counting of H&E-stained slides, manual counting involves variability between individual counters. Semi-automated image analysis of PCNA-stained slides yields an accurate and consistent count of these primordial/primary follicles and eliminates variability between individual counters.

First published on May 8, 2008, doi:10.1177/0192623308317428

Toxicologic Pathology 2008;36:674.

A more recent version of this article appeared on July 1, 2008

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