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Related Experiment Videos

NMDA receptors regulate developmental gap junction uncoupling via CREB signaling.

Harsha Arumugam1, Xinhuai Liu, Paul J Colombo

  • 1Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana 70118, USA.

Nature Neuroscience
|November 22, 2005
PubMed
Summary

Neural development involves decreasing gap junction signaling. NMDA receptor activity drives this uncoupling by reducing connexin 36 (Cx36) protein expression through CREB signaling.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cellular Signaling

Background:

  • Gap junctions (electrical synapses) are crucial for mammalian central nervous system development.
  • Neuronal gap junction coupling decreases significantly from postnatal development into adulthood.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying developmental uncoupling of gap junctions in the rat hypothalamus.
  • To identify the role of NMDA receptors and CREB signaling in regulating connexin 36 (Cx36) expression during development.

Main Methods:

  • In vivo and in vitro studies in rat hypothalamus.
  • Manipulation of NMDA receptor activity, action potentials, and CREB signaling.
  • Analysis of connexin 36 (Cx36) protein expression.

Related Experiment Videos

  • Utilizing NMDAR1 knockout mice.

    • Main Results:

    • Developmental uncoupling of hypothalamic gap junctions correlates with decreased Cx36 protein.
    • NMDA receptor blockade, action potential blockade, and inhibition of CREB signaling prevent uncoupling and Cx36 downregulation.
    • CREB overexpression accelerates uncoupling and Cx36 downregulation.
    • Non-NMDA receptor blockade does not affect uncoupling; NMDAR1 knockout neurons show no developmental uncoupling.

    Conclusions:

    • NMDA receptor activity is a key driver of developmental gap junction uncoupling in the hypothalamus.
    • This uncoupling process is mediated by the CREB-dependent downregulation of connexin 36 (Cx36) protein expression.