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Related Experiment Videos

G(alpha)s levels regulate Xenopus laevis oocyte maturation.

Ximena Romo1, M Victoria Hinrichs, Leonardo Guzmán

  • 1Departmento de Biología Molecular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile.

Molecular Reproduction and Development
|September 5, 2002
PubMed
Summary

Progesterone halts oocyte maturation by inhibiting adenylyl cyclase via G-protein alpha s (Gαs). Altering Gαs levels or overexpressing G-protein coupled receptors impacts this crucial cell cycle regulation in Xenopus laevis.

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Area of Science:

  • Cell Biology
  • Molecular Endocrinology
  • Signal Transduction

Background:

  • Progesterone induces Xenopus laevis oocyte maturation by inhibiting adenylyl cyclase.
  • G-protein involvement is suggested by the GTP-dependence of progesterone's inhibitory effect.
  • Progesterone is proposed to interfere with G-protein alpha s (Gαs) function at the plasma membrane.

Purpose of the Study:

  • To investigate the role of Gαs levels in progesterone-induced oocyte maturation.
  • To determine if altering Gαs affects the cell cycle arrest mechanism.

Main Methods:

  • Overexpression of wild-type and constitutively active Gαs (Gαs(QL)) in Xenopus oocytes.
  • Depletion of Gαs using antisense oligonucleotides.
  • Assessment of maturation via MAPK activation.

Related Experiment Videos

  • Overexpression of G-protein coupled receptors (GPCRs) like β2-adrenergic and m4/m5 muscarinic receptors.

    • Main Results:

    • Overexpression of Gαs (wt and QL) blocked progesterone-induced maturation, with Gαs(QL) being more potent.
    • Gαs depletion led to spontaneous maturation, indicating Gαs is essential for maintaining arrest.
    • Overexpression of specific GPCRs inhibited progesterone-induced maturation, suggesting a role for Gβγ subunits.

    Conclusions:

    • Gαs plays a critical role in regulating Xenopus oocyte maturation.
    • Gαs is necessary to maintain meiotic arrest.
    • A model is proposed where activated Gαs and Gβγ maintain high cAMP levels, blocking the G2/M transition.