Journal
JOURNAL OF REPRODUCTION AND DEVELOPMENT
Volume 53, Issue 3, Pages 631-637Publisher
SOCIETY REPRODUCTION & DEVELOPMENT-SRD
DOI: 10.1262/jrd.19010
Keywords
in vitro growth; growing oocytes; mitochondria; mitochondrial transcriptional factor A (TFAM); rabbit
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To clarify the mechanism that impairs development of in vitro grown (IVG) oocytes, we assessed whether the developmental disability of IVG oocytes is caused by cytoplasmic dysfunction. First, we assessed the cleavage of nuclear-substituted oocytes cultured in vitro. The nuclei, but not the cytoplasm, of the IVG oocytes were able to support subsequent cleavage after artificial activation. The mitochondrial activity of the oocytes increased as the follicles grew. However, the mitochondrial activity of the IVG oocytes was significantly lower than that of ovulated oocytes and oocytes recovered from follicles with diameters of more than 300 mu m. Furthermore, the expression levels of mitochondrial transcriptional factor A (TFAM) in the oocytes increased in a similar manner. However, the expression levels of TFAM in the IVG oocytes was significantly lower than that of ovulated oocytes and oocytes recovered from follicles with diameters of more than 300 mu m. Taken together, these results indicate that the low developmental competence of IVG oocytes is caused by a cytoplasm deficiency due to low mitochondrial activity.
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