Abstract：
:Neurotransmitter and headache target localization in the trigeminal ganglia (TG) might increase the understanding of sites of action, and mechanisms related to headache therapy. The overall aim of the study was to investigate the presence of migraine targets in the TG with particular emphasis on pituitary adenylate cyclase-activating peptide (PACAP) and calcitonin gene-related peptide (CGRP), known to be involved in cranial pain processing, and selected headache targets. Rat- and human TG were processed for immunohistochemistry. PACAP-38, CGRP and the headache targets were expressed in rat and human TG. PACAP receptors were confined to neurons and satellite glial cells (SGCs), however with variability between the receptor subtypes PACAP type I receptor (PAC1) and vasoactive intestinal peptide/PACAP receptors 1/2 (VPAC1/2). 5-Hydroxytryptamine (5-HT) receptors were expressed in neuronal somas in rat and human TG (human TG frequency: 5-HT1D > 5-HT1B/1F). Synaptosomal-associated protein 25 kDa (SNAP25) was primarily expressed in SGCs in humans, and neurons in rats, while synaptic vesicle glycoprotein 2A (SV2-A) was confined to SGCs and some neurons in rats and humans. Occasionally, PACAP-38-positive cells also expressed VPAC1, SNAP25 and SV2-A. VPAC1 was generally detected in SGCs enveloping PACAP-38-positive and -negative neuronal somas. Our study revealed potential sites of actions for anti-headache drugs such as PACAP receptor antagonists, Lasmiditan (5-HT1F agonist) and Botox (blocks exocytosis through SV2-A/SNAP25) in rat and human TG and considerable overlap between species in expression to specific cell types, except for VPAC1 and SNAP25.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Frederiksen SD,Warfvinge K,Ohlsson L,Edvinsson Ldoi
10.1016/j.neuroscience.2018.10.004subject
Has Abstractpub_date
2018-11-21 00:00:00pages
319-332eissn
0306-4522issn
1873-7544pii
S0306-4522(18)30665-1journal_volume
393pub_type
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