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The different roles of cyclinD1-CDK4 in STP and mGluR-LTD during the postnatal development in mice hippocampus area

Chenchen Li1, Xinmei Li, Weiheng Chen

  • 1Department of Neurobiology and Biophysics, School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, PR China. glacier@mail.ustc.edu.cn <glacier@mail.ustc.edu.cn>

BMC Developmental Biology
|May 31, 2007
PubMed
Abstract

Insights

CyclinD1-CDK4 activation is crucial for short-term synaptic plasticity and metabotropic glutamate receptor-dependent long-term depression in developing mouse hippocampus. This suggests distinct roles for cyclin-dependent kinases beyond cell cycle regulation.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Cell-cycle proteins like cyclins and cyclin-dependent kinases (CDKs) may have functions beyond cell cycle regulation.
  • Expression and translocation of cyclinD1-CDK4 in post-mitotic neurons suggest roles in neuronal plasticity.

Purpose of the Study:

  • To investigate the role of cyclinD1-CDK4 in synaptic plasticity in the hippocampus.
  • To determine if CDK4 plays a role in different forms of synaptic plasticity during postnatal development.

Main Methods:

  • Examined CDK4 expression in mouse hippocampus (CA1 region) at different postnatal ages.
  • Utilized a CDK4 inhibitor to assess its effects on basal synaptic transmission, short-term synaptic plasticity (STP), long-term potentiation (LTP), and long-term depression (LTD).
  • Compared effects in neonatal and adolescent mice.

Main Results:

  • CDK4 expression patterns changed from nuclear/cytoplasmic to predominantly cytoplasmic with age.
  • CDK4 inhibition impaired STP in both neonatal and adolescent mice.
  • NMDA receptor-dependent LTP and LTD were unaffected by CDK4 inhibition.
  • Group I mGluR-dependent LTD and LTD induced by paired-pulse low-frequency stimulation were impaired by CDK4 inhibition, with effects being more pronounced in neonatal mice.

Conclusions:

  • CyclinD1-CDK4 activation is essential for STP and mGluR-dependent LTD.
  • CDK4 plays distinct roles in hippocampal synaptic plasticity during postnatal development.
  • These findings highlight non-canonical functions of cell-cycle-related proteins in mature neurons.

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