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RESEARCH |
Departments of Anatomy and Cell Biology and 1 Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, VIC, Australia, 2 Prince Henry’s Institute of Medical Research, Clayton, VIC, Australia and 3 School of Biomedical Sciences, Queen’s Medical Centre, University of Nottingham, Nottingham, UK
Correspondence should be addressed to J Kerr, Department of Anatomy and Cell Biology, School of Biomedical Sciences, Building 13C Faculty of Medicine, Monash University, VIC 3800, Australia; Email: jeff.kerr{at}med.monash.edu.au
Accurate estimation of the number of ovarian follicles at various stages of development is an important indicator of the process of folliculogenesis in relation to the endocrine signals and paracrine/autocrine mechanisms that control the growth and maturation of the oocytes and their supporting follicular cells. There are 10-fold or greater differences in follicular numbers per ovary at similar ages and/or strains reported in earlier studies using various methods, leading to difficulties with interpretation of ovarian function in control vs experimental conditions. This study describes unbiased, assumption-free stereological methods for quantification of early and growing follicular numbers in the mouse ovary. A fractionator approach was used to sample a defined fraction of histological sections of adult wild-type ovaries. Primordial and primary follicles were counted independently with the optical and physical disector methods. The fractionator/disector methods, which are independent of follicular size or shape, gave estimations of 1930 ± 286 (S.E.M.) and 2227 ± 101 primordial follicles, and 137 ± 25 and 265 ± 32 primary follicles per ovary at 70 and 100 days of age respectively. From exact counts on serial sections, secondary and later follicular numbers at 100 days of age were estimated at 135 per ovary. Remnants of zona pellucidae (a marker of previous follicular atresia) were estimated using a fractionator/physical disector approach and were approximately 500 per ovary. The application of the quantitative methods described will facilitate an improved understanding of follicular dynamics and the factors that mediate their growth and maturation and allow for a better comparison between different studies.
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