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Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
11:13

Using Mouse Oocytes to Assess Human Gene Function During Meiosis I

Published on: April 10, 2018

Involvement of cAMP-dependent protein kinase and protein phosphorylation in regulation of mouse oocyte maturation

E A Bornslaeger, P Mattei, R M Schultz

    Developmental Biology
    |April 1, 1986
    PubMed

    Insights

    A decrease in cyclic AMP (cAMP) in mouse oocytes triggers meiotic maturation. Inhibiting cAMP or its signaling pathway with phosphodiesterase (PDE) or protein kinase (PK) inhibitors initiates maturation, while activating PK maintains arrest.

    Area of Science:

    • Cell Biology
    • Developmental Biology
    • Reproductive Biology

    Background:

    • Meiotic maturation in oocytes is a critical process for reproduction.
    • Cyclic AMP (cAMP) is known to play a role in maintaining meiotic arrest in oocytes.
    • The precise mechanisms by which cAMP regulates this process are still being investigated.

    Purpose of the Study:

    • To investigate the role of intracellular cyclic AMP (cAMP) levels in initiating meiotic maturation in mouse oocytes.
    • To elucidate the involvement of cAMP-dependent protein kinase (PK) in mediating meiotic arrest.

    Main Methods:

    • Microinjection of mouse oocytes with cyclic nucleotide phosphodiesterase (PDE), 2'-deoxy cAMP, cAMP, protein kinase (PK) inhibitors (PKI), and PK catalytic subunits.
    • Inhibition and activation of signaling pathways using specific chemical agents like 3-isobutyl-1-methylxanthine (IBMX) and dibutyryl cAMP (dbcAMP).
    • Analysis of germinal vesicle breakdown (GVBD) as an indicator of meiotic maturation and examination of oocyte phosphoprotein changes.

    Main Results:

    • Microinjection of PDE induced germinal vesicle breakdown (GVBD), indicating meiotic maturation, even in the presence of IBMX.
    • 2'-deoxy cAMP failed to maintain meiotic arrest, unlike cAMP, suggesting cAMP's role in PK activation.
    • Microinjection of PK inhibitor (PKI) induced GVBD, while PK catalytic subunit maintained meiotic arrest, demonstrating the involvement of PK in regulating maturation.

    Conclusions:

    • A decrease in intraoocyte cAMP initiates meiotic maturation in mouse oocytes.
    • Cyclic AMP-dependent protein kinase (PK) mediates meiotic arrest, and its inhibition triggers maturation.
    • Specific changes in oocyte phosphoproteins are linked to meiotic resumption and are regulated by the cAMP/PK pathway.

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