Triptans Attenuate Capsaicin-induced CREB Phosphorylation Within the Trigeminal Nucleus Caudalis: a Mechanism to Prevent Central Sensitization?

Overview

Journal J Headache Pain

Publisher Biomed Central

Date 2011 Jun 1

PMID 21626018

Citations 8

Authors

Dimos D Mitsikostas

Yolande E Knight

Michele Lasalandra

Nikolaos Kavantzas

Peter J Goadsby

Affiliations

Soon will be listed here.

Abstract

The c-AMP-responsive element binding protein (CREB) and its phosphorylated product (P-CREB) are nuclear proteins expressed after stimulation of pain-producing areas of the spinal cord. There is evidence indicating that central sensitization within dorsal horn neurons is dependent on P-CREB transcriptional regulation. The objectives of the study were to investigate the expression of P-CREB in cells in rat trigeminal nucleus caudalis after noxious stimulation and to determine whether pre-treatment with specific anti-migraine agents modulate this expression. CREB and P-CREB labelling was investigated within the trigeminal caudalis by immunohistochemistry after capsaicin stimulation. Subsequently, the effect of i.v. pre-treatment with either sumatriptan (n = 5), or naratriptan (n = 7) on P-CREB expression was studied. Five animals pre-treated with i.v. normal saline were served as controls. CREB and P-CREB labelling was robust in all animal groups within Sp5C. Both naratriptan and sumatriptan decreased P-CREB expression (p = 0.0003 and 0.0013) within the Sp5C. Triptans attenuate activation of CREB within the central parts of the trigeminal system, thereby leading to potential inhibition of central sensitization. P-CREB may serve as a new marker for post-synaptic neuronal activation within Sp5C in animal models relevant to migraine.

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