A modified protocol for in vitro maturation of mouse oocytes from secondary preantral follicles

DOI: 10.4236/abb.2012.31010   PDF   HTML     6,828 Downloads   13,773 Views   Citations


A 2-step culture system was designed and tested for the in vitro maturation efficiency of oocytes from pre-puberty preantral follicles of FVB/N inbred mice. The following modifications were made: 1) The concentration of ITS was reduced by half in the basal MIF medium to minimize uncoordinated growth between oocyte and GC cells; 2) Heterogeneous preantral follicles were cultured in groups of 3 - 5 follicles in hanging drops of medium with reduced concentration of ITS for six days to induction follicular aggregation. This hanging drop method mimics a 3-D IVM culture system at the early stage of cultivation in which the sphere structure of each follicle is well maintained. It also enables follicles in each aggregate to communicate with each other, synchronize their growth, and thus prevent immature follicular rupture. 3) Medium was further supplemented with retinoic acid to enhance developmental capacity of meiotically arrested oocytes. After a 14-day culture in vitro, ~37% of the collected inbred preantral follicles completed nuclear maturation. Approximately 94% of the mature oocytes tested were able to be fertilized; and 77% of them developed into healthy embryos. These results demonstrate that our IVM system is reliable to produce a satisfactory number of high quality oocytes. In addition, multiple cytoplasmic parameters, including gene expression of key regulators, chromosome/spindle organization, mitochondrial proliferation and distribution, and total ATP content were explored to characterize the supportive and limiting components of our IVM system so that the culture system can be further optimized.

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Wang, W. , Tang, Y. , Ni, L. , Jongwutiwes, T. , Liu, H. and Rosenwaks, Z. (2012) A modified protocol for in vitro maturation of mouse oocytes from secondary preantral follicles. Advances in Bioscience and Biotechnology, 3, 57-74. doi: 10.4236/abb.2012.31010.

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The authors declare no conflicts of interest.


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