Abstract：
:Partial sciatic nerve ligation in mice caused a marked and persistent decrease in the latency of paw withdrawal from a thermal stimulus only on the ipsilateral side. This thermal hyperalgesia was abolished by repeated intrathecal pretreatment with a specific antibody to brain-derived neurotrophic factor (BDNF), but not neurotrophin-4, just before and after the nerve ligation. These results provide direct evidence that BDNF within the spinal cord may contribute to the development of thermal hyperalgesia caused by nerve injury in mice. We previously reported that protein level of full-length TrkB, which contains the cytoplasmic protein tyrosine kinase domain, were clearly increased on the ipsilateral side of spinal cord membranes obtained from sciatic nerve-ligated mice. In the present study, we further demonstrated that the increased in the protein level of full-length TrkB is completely reversed by concomitant intrathecal injection of BDNF antibody. Furthermore, thermal hyperalgesia induced by nerve ligation was completely suppressed by repeated intrathecal injection of a specific antibody to full-length TrkB and an inhibitor of the protein tyrosine kinase activity for the neurotrophin receptor, K-252a. However, repeated intrathecal injection of a specific antibody to truncated TrkB, which lacks the cytoplasmic protein tyrosine kinase domain, failed to reverse thermal hyperalgesia observed in nerve-ligated mice. These findings suggest the possibility that the binding of BDNF to full-length TrkB and subsequent its activation may play a critical role in the development of neuropathic pain-like thermal hyperalgesia induced by nerve injury in mice.
journal_name
Brain Resjournal_title
Brain researchauthors
Yajima Y,Narita M,Narita M,Matsumoto N,Suzuki Tdoi
10.1016/s0006-8993(02)03666-1subject
Has Abstractpub_date
2002-12-27 00:00:00pages
338-46issue
2eissn
0006-8993issn
1872-6240pii
S0006899302036661journal_volume
958pub_type
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