Abstract:
STUDY DESIGN:In vitro and in vivo study of a rat inflammatory pain model using nuclear factor-kappa B decoy. OBJECTIVES:To investigate transduction efficiency of nuclear factor-kappa B decoy into dorsal root ganglion, both in vivo and in vitro, and to assess the suppression of inflammatory pain by nuclear factor-kappa B decoy. SUMMARY OF BACKGROUND DATA:Transcription factor nuclear factor-kappa B is reported to play a crucial role in regulating pro-inflammatory cytokine gene expression. We hypothesized that inhibiting nuclear factor-kappa B gene expression with nuclear factor-kappa B decoy may suppress inflammatory pain. METHODS:Nuclear factor-kappa B decoy-fluorescein isothiocyanate (FITC) was induced in explant culture, endoneurally injected into the sciatic nerve, and its transduction efficiency into dorsal root ganglion measured. For behavioral testing, 12 rats received plantar injections of complete Freund's adjuvant and were divided into 3 groups: decoy group, single endoneural injection of 10 microL of nuclear factor-kappa B decoy (n = 4); saline group, single endoneural injection of 10 microL of saline (n = 4); and naïve group, untreated (n = 4). Behavioral testing was performed using von Frey filaments and a Hargreaves device with a heat source. RESULTS:Total transduction efficiency of nuclear factor-kappa B decoy-FITC was 53.6% in vitro and 20.5% in vivo. No statistical differences were observed with respect to types of cell size distributions of all FITC-positive neurons. In behavioral testing, withdrawal latencies or thresholds significantly differed between the decoy group and the saline group from 2 to 14 days after surgery in the mechanical allodynia experiments, and from 2 to 3 days after surgery in the thermal hyperalgesia experiments. CONCLUSIONS:Nuclear factor-kappa B decoy was conveyed and transduced into dorsal root ganglion both in vivo and in vitro. Additionally, nuclear factor-kappa B decoy reduced mechanical allodynia and thermal hyperalgesia in the rat inflammatory pain model, suggesting that inhibition of nuclear factor-kappa B with nuclear factor-kappa B decoy may represent a key mechanism for mediating inflammation or reducing inflammatory pain.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Inoue G,Ochiai N,Ohtori S,Nakagawa K,Gemba T,Doya H,Ito T,Koshi T,Moriya H,Takahashi Kdoi
10.1097/01.brs.0000248424.46652.67subject
Has Abstractpub_date
2006-12-01 00:00:00pages
2904-8issue
25eissn
0362-2436issn
1528-1159pii
00007632-200612010-00005journal_volume
31pub_type
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