Abstract:
:Although known primarily for its role in neuronal development, brain-derived neurotrophic factor (BDNF) has also recently been implicated in processes mediated by the adult nervous system, such as spinal nociception. Peripheral inflammation increases expression of BDNF preferentially in dorsal root ganglion cells that contain substance P and/or calcitonin gene-related peptide, known nociceptive transmitters for which synthesis is also increased during inflammatory states. Expression of the tyrosine kinase receptor that selectively binds BDNF, trkB, is increased in the spinal dorsal horn during inflammation as well. Additionally, intrathecal (i.t.) administration of the BDNF-scavenging protein trkB-IgG attenuates inflammation-induced behavioral responses. Collectively, this evidence implicates BDNF in spinal nociceptive processes. Here we show that, in normal mice, i.t. BDNF produces an acute, dose-dependent thermal hyperalgesic response. Selective inhibition of BDNF expression by i.t. antisense oligodeoxynucleotide treatment produces antinociception in normal mice and attenuates carrageenan-induced hyperalgesia. Further, we demonstrate that i.t. antisense treatment directed against the full-length trkB receptor (trkB.FL) attenuates carrageenan-induced hyperalgesia. Consistent with a trkB.FL-mediated mechanism, the i.t. administration of another trkB ligand, neurotrophin-4/5, also produces hyperalgesia while the trkC agonist neurotrophin-3, which weakly cross-reacts with trkB, has little effect. Finally, with the accumulating evidence linking BDNF to synaptic plasticity, we investigated whether BDNF-induced hyperalgesia in normal mice involves the N-methyl-D-aspartate (NMDA) receptor. Interestingly, i.t. co-administration of the NMDA receptor antagonist D(-)-2-amino-5-phosphonovaleric acid (D-APV) with BDNF dose-dependently inhibits BDNF-induced hyperalgesia, suggesting that BDNF induces acute hyperalgesic responses and affects central sensitization in a process dependent on NMDA receptor activation.
journal_name
Painjournal_title
Painauthors
Groth R,Aanonsen Ldoi
10.1016/s0304-3959(02)00264-6keywords:
subject
Has Abstractpub_date
2002-11-01 00:00:00pages
171-81issue
1-2eissn
0304-3959issn
1872-6623pii
S0304395902002646journal_volume
100pub_type
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