N-methyl-D-aspartate receptor subunit phenotypes of vagal afferent neurons in nodose ganglia of the rat.

The Journal of Comparative Neurology
Krzysztof CzajaG A Burns

Abstract

Most vagal afferent neurons in rat nodose ganglia express mRNA coding for the NR1 subunit of the heteromeric N-methyl-D-aspartate (NMDA) receptor ion channel. NMDA receptor subunit immunoreactivity has been detected on axon terminals of vagal afferents in the dorsal hindbrain, suggesting a role for presynaptic NMDA receptors in viscerosensory function. Although NMDA receptor subunits (NR1, NR2B, NR2C, and NR2D) have been linked to distinct neuronal populations in the brain, the NMDA receptor subunit phenotype of vagal afferent neurons has not been determined. Therefore, we examined NMDA receptor subunit (NR1, NR2B, NR2C, and NR2D) immunoreactivity in vagal afferent neurons. We found that, although the left nodose contained significantly more neurons (7,603), than the right (5,978), the proportions of NMDA subunits expressed in the left and right nodose ganglia were not significantly different. Immunoreactivity for NMDA NR1 subunit was present in 92.3% of all nodose neurons. NR2B immunoreactivity was present in 56.7% of neurons; NR2C-expressing nodose neurons made up 49.4% of the total population; NR2D subunit immunoreactivity was observed in just 13.5% of all nodose neurons. Double labeling revealed that 30.2% of nodose neurons...Continue Reading

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Citations

May 13, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Jason WrightRobert C Ritter
Feb 6, 2009·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Douglas B GuardMihai Covasa
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Jul 2, 2010·The Journal of Comparative Neurology·Zachary R GallaherKrzysztof Czaja
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Aug 8, 2021·Neuropharmacology·Jeffrey C WatkinsBruno G Frenguelli

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