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Establishment of a basic method for manipulating preantral follicles: effects of retrieval method on in vitro growth of preantral follicles and intrafollicular oocytes

Published online by Cambridge University Press:  01 May 2007

S.T. Lee
Affiliation:
Department of Food and Animal Biotechnology, Seoul National University, Seoul 151-921, Korea.
M.H. Choi
Affiliation:
Department of Food and Animal Biotechnology, Seoul National University, Seoul 151-921, Korea.
S.P. Gong
Affiliation:
Department of Food and Animal Biotechnology, Seoul National University, Seoul 151-921, Korea.
J.Y. Han
Affiliation:
Department of Food and Animal Biotechnology, Seoul National University, Seoul 151-921, Korea.
J.M. Lim*
Affiliation:
Department of Food and Animal Biotechnology, Seoul National University, Seoul 151-921, Korea. Stem Cell Research Center and IRMP, College of Medicine, Seoul National University, Seoul 110-744, Korea.
*
All correspondence to: Jeong Mook Lim, DVM, PhD, Laboratory of Embryology and Gamete Biotechnology, Department of Food and Animal Biotechnology, Seoul National University, Building 200-#4223, Sillim-9 Dong, Seoul 151-921, Korea. Tel: +822 880 4806. Fax: +822 8742555. e-mail: [email protected]

Summary

The aim of this study was to establish a basic manipulation protocol of preantral follicles for deriving developmentally competent oocytes. Primary, early and late secondary follicles retrieved from the ovaries of 14-day-old F1 (C57BL/6 × DBA2) female mice mechanically or enzymatically were cultured singly and in vitro growth of the follicles and maturation of intrafollicular oocytes were subsequently monitored. A mechanical method retrieved more (p < 0.0001) follicles (339 ± 48 vs. 202 ± 28) than an enzymatic method. However, the enzymatic method collected more singly isolated follicles that could be provided for subsequent culture (102 ± 26 vs. 202 ± 28). When an enzymatic method was employed, early and late secondary follicles required 9 and 6 days for reaching the maximal incidence of the pseudoantral stage. However, primary follicles were not possible to develop into the pseudoantral stage. The optimal duration of oocyte maturation from the onset of follicle culture was 7 days and 5–7 days for early and late secondary follicles, respectively. A general decrease in oocyte diameter (65.2–65.53 μm vs. 75 μm) and zona thickness (5.41–5.74 μm vs. 7.76 μm) was detected in in vitro-derived compared with in vivo-derived matured oocytes. Pronuclear formation was detected in 86–94% of mature oocytes after parthenogenetic activation and no significant difference was detected among groups. These results showed that preantral follicles retrieved by an enzymatic method underwent step-by-step growth in vitro, which could yield mature oocytes.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 2007

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