TY - JOUR
T1 - Expression of VPAC2 receptor and PAC1 receptor splice variants in the trigeminal ganglion of the adult rat
AU - Chaudhary, Priya
AU - Baumann, Thomas K.
N1 - Funding Information:
This work was supported by the NRSA fellowship NS11043 to P.C. and the PHS grant NS37149 to T.K.B., both from the National Institute for Neurological Disease and Stroke. We would like to thank Dr. Victor May, University of Vermont, for generously sharing the antibody against PAC1 receptor.
PY - 2002
Y1 - 2002
N2 - PACAP and VIP are members of the VIP/secretin/glucagon family of peptides with neurotransmitter, neuroprotective, and neurotrophic functions. PACAP and VIP are known to be upregulated in primary sensory neurons following nerve injury, implying that these neuropeptides could be mediators of sensory transmission in neuropathic pain states. Nerve injury at the level of the trigeminal root is thought to be the prime cause of trigeminal neuralgia. Since cross-excitation (a chemically-mediated form of nonsynaptic transmission) within the TG is postulated to play a central role in trigeminal neuralgia, we studied the expression of PACAP and VIP receptors in the TG by RT PCR and immunocytochemistry. Of the three known receptors (PAC1, VPAC1 and VPAC2), RT PCR revealed the presence of mRNA for VPAC2 and several splice variants of the PAC1 receptor. Immunocytochemistry showed PAC1 and VPAC2 to be present in small-diameter TG neurons. Thus, PACAP and VIP are potential mediators of cross-excitation in the TG.
AB - PACAP and VIP are members of the VIP/secretin/glucagon family of peptides with neurotransmitter, neuroprotective, and neurotrophic functions. PACAP and VIP are known to be upregulated in primary sensory neurons following nerve injury, implying that these neuropeptides could be mediators of sensory transmission in neuropathic pain states. Nerve injury at the level of the trigeminal root is thought to be the prime cause of trigeminal neuralgia. Since cross-excitation (a chemically-mediated form of nonsynaptic transmission) within the TG is postulated to play a central role in trigeminal neuralgia, we studied the expression of PACAP and VIP receptors in the TG by RT PCR and immunocytochemistry. Of the three known receptors (PAC1, VPAC1 and VPAC2), RT PCR revealed the presence of mRNA for VPAC2 and several splice variants of the PAC1 receptor. Immunocytochemistry showed PAC1 and VPAC2 to be present in small-diameter TG neurons. Thus, PACAP and VIP are potential mediators of cross-excitation in the TG.
KW - PACAP
KW - Trigeminal neuralgia
KW - VIP
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U2 - 10.1016/S0169-328X(02)00329-7
DO - 10.1016/S0169-328X(02)00329-7
M3 - Article
C2 - 12225867
AN - SCOPUS:0037103917
SN - 0169-328X
VL - 104
SP - 137
EP - 142
JO - Brain research. Molecular brain research
JF - Brain research. Molecular brain research
IS - 2
ER -