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Specific PKC isoforms regulate blastocoel formation during mouse preimplantation development.

Judith J Eckert1, Amanda McCallum, Andrew Mears

  • 1Division of Cell Sciences, School of Biological Sciences, University of Southampton, Southampton SO16 7PX, UK. jje@soton.ac.uk

Developmental Biology
|September 24, 2004
PubMed
Summary
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Protein kinase C (PKC) signaling regulates mammalian blastocyst cavitation by influencing Na+/K+ ATPase localization. Inhibition of specific PKC isoforms delays blastocyst formation, highlighting their crucial role in early embryonic development.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biochemistry

Background:

  • Blastocyst morphogenesis is critical for mammalian development, involving trophectoderm (TE) epithelial differentiation and segregation from the inner cell mass (ICM).
  • TE differentiation requires intercellular junction formation and ion transport, primarily mediated by Na+/K+ ATPase, for blastocoel expansion.

Purpose of the Study:

  • To investigate the roles of protein kinase C (PKC) signaling and gap junctional communication in TE differentiation and blastocyst cavitation.
  • To determine the specific PKC isoforms involved and their impact on key TE differentiation markers like Na+/K+ ATPase.

Main Methods:

  • Immunohistochemical analysis of PKC isoform distribution (delta, theta, iota/lambda, zeta, and PKCmicro/PKD1) and ZO-1alpha+ in TE.
  • Pharmacological inhibition of specific PKC isoforms (PKCdelta, PKCzeta) and gap junctional communication.

Related Experiment Videos

  • Assessment of Na+/K+ ATPase alpha1 subunit localization.

    • Main Results:

    • PKC isoforms showed distinct localization patterns in TE and ICM, with partial colocalization with tight junctions.
    • Inhibition of PKCdelta and PKCzeta significantly delayed blastocyst formation.
    • PKC modulation led to Na+/K+ ATPase alpha1 subunit internalization from the membrane, without affecting established epithelial junctions. Gap junction inhibition had no effect.

    Conclusions:

    • Distinct PKC isotypes are essential regulators of blastocyst cavitation in preimplantation embryos.
    • PKC signaling influences cavitation through mechanisms involving target proteins such as Na+/K+ ATPase.
    • Gap junctional communication does not play a significant role in this process.