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Jennings, E.A. et al.

Ernest A. Jennings, MacDonald J. Christie, Barry J. Sessle,

ATP potentiates neurotransmission in the rat trigeminal subnucleus caudalis.

Ionotropic purine receptors (P2X) have been implicated in nociceptive neurotransmission. In this study, we examine the actions of the P2X receptor agonist alpha,beta methylene adenosine 5'-triphosphate on excitatory neurotransmission in neurons in the deep and superficial laminae of the trigeminal spinal subnucleus caudalis (Vc), which receives nociceptive inputs from the craniofacial region. Alpha, beta methylene adenosine 5'-triphosphate caused an increase in spontaneous excitatory neurotransmission (miniature excitatory postsynaptic currents) in neurons in deep but not superficial laminae of Vc; this effect could be inhibited by the P2X receptor antagonist 2,3-O-2,4,6-trinitrophenyl-ATP. Conversely, the TRPV1 agonist capsaicin caused an increase in miniature excitatory postsynaptic currents in neurons in the superficial but not deep laminae. These data suggest that alpha,beta methylene adenosine 5'-triphosphate acts on presynaptic terminals to increase glutamatergic neurotransmission in deep Vc neurons.[1]

References

ATP potentiates neurotransmission in the rat trigeminal subnucleus caudalis. Jennings, E.A., Christie, M.J., Sessle, B.J. Neuroreport (2006) [Pubmed]

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