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Related Experiment Videos

Differential NR2A and NR2B expression between trigeminal neurons during early postnatal development.

Jack E Turman1, Ophelia K Lee, Scott H Chandler

  • 1Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California 90089, USA. turman@hsc.usc.edu

Synapse (New York, N.Y.)
|March 14, 2002
PubMed
Summary

This study reveals how N-methyl-D-aspartate (NMDA) receptor subunit expression changes in rat brainstem neurons during the transition from suckling to chewing. These molecular shifts in NR2A and NR2B subunits impact trigeminal motor functions.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • N-methyl-D-aspartate (NMDA) receptors are crucial for rhythmical trigeminal motor activities like suckling and chewing.
  • The developmental interplay between NMDA receptor subunit expression and oral-motor circuitry function remains incompletely understood.

Purpose of the Study:

  • To investigate the developmental expression patterns of NR2A and NR2B NMDA receptor subunits in trigeminal motoneurons (Mo5) and mesencephalic trigeminal neurons (Me5).
  • To correlate these molecular changes with the functional transition from suckling to chewing behaviors in rats.

Main Methods:

  • Receptor immunohistochemistry was employed to visualize NR2A and NR2B subunit expression.
  • Expression levels and ratios were analyzed in Mo5 and different regions of Me5 (caudal and rostral) during the first two weeks of postnatal development (P0-1 to P11).

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Main Results:

  • In Mo5, both NR2A and NR2B were present throughout development, with a significant increase in the NR2A:NR2B ratio by P11 due to decreased NR2B.
  • Caudal Me5 showed a decreasing NR2A:NR2B ratio from P0-1 to P11, marked by increased expression of both subunits.
  • Rostral Me5 exhibited delayed emergence of NR2A and NR2B immunoreactivity at P3 and P11, respectively.

Conclusions:

  • Differential regulation of NR2A and NR2B subunits occurs in distinct neuronal populations (Mo5 vs. Me5) and brainstem regions during early development.
  • These distinct developmental trajectories of NMDA receptor subunits suggest region-specific functional roles in mediating oral-motor behaviors like suckling and chewing.