Follicle cell regulation of amino acid uptake and polyphosphoinositide metabolism in oocytes of the limpet Patella vulgata

Article Abstract:

The effects of the follicle cells on the oocyte metabolism are either stimulatory or inhibitory depending on the maturity stage. In the immature oocyte the follicle cells induce a low level polyphosphoinositide turnover. During maturation these cells ensure maximum activation of the metabolism. Optimum transport of the amino acid leucine is possible in the presence of the follicle cells.

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Okadaic acid accelerates germinal vesicle breakdown and overcomes cycloheximide- and 6-dimethylaminopurine block in cattle and pig oocytes

Article Abstract:

Release from the follicle results in spontaneous continuation of first meiotic division within 20 hrs for pig oocytes, and within 8 hrs for cattle oocytes. The activity of histone H1 kinase increases during maturation and reaches a peak in metaphase I in both cases. The treatment with okadaic acid enhances germinal vesicle breakdown (GVBD) and histone H1 kinase activation.

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A subpial, transitory germinal zone forms chains of neuronal precursors in the rabbit cerebellum

Article Abstract:

Study of migration of meninges during development of neurogenetic development , through use of PSA-NCAM techniques is presented.

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