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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Involvement of the nitric oxide-cyclic GMP-protein kinase G-K+ channel pathway in the antihyperalgesic effects of bovine lactoferrin in a model of neuropathic pain.
Brain Research 2008 May 14
The possible involvement of the nitric oxide (NO)-cyclic GMP (cGMP)-protein kinase G (PKG) pathway on bovine lactoferrin (BLF)-induced spinal antihyperalgesic activity was elucidated in sciatic nerve injured rats. Intrathecal BLF reduced thermal hyperalgesia in a dose-dependent manner. Pretreatment with NG-L-nitro-arginine methyl ester (L-NAME, non-specific inhibitor of NO synthase), 7-nitroindazole (7-NI, neuronal NO synthase inhibitor), 1H-[1,2,4]-oxadiazolo [4,3-a] quinoxalin-1-one (ODQ, guanylyl-cyclase inhibitor), (9S, 10R, 12R)-2,3,9,10,11,12-hexahydro-10-methoxy-2, 9-dimethyl-1-oxo-9, 12-epoxy-1H-diindolo-[1,2,3-fg:3',2',1'-kl]pyrrolo[3,4-i][1,6]benzodiazocine-10-carboxylic acid methyl ester (KT-5823, specific PKG inhibitor) or glybenclamide (ATP-sensitive K+ channel blocker), but not NG-D-nitro-arginine methyl ester (D-NAME, an inactive enantiomer of l-NAME), d-Phe-Cys-Tyr-d-Trp-Orn-Thr-NH2 (CTOP, selective mu-opioid receptor antagonist) or naloxone (nonselective opioid receptor antagonist) prevented BLF-induced antihyperalgesia. Data suggest that BLF-induced spinal antihyperalgesia could be due to activation of the NO-cGMP-PKG-K+ channel pathway and it is not mediated by mu-opioid receptor in a model of neuropathic pain.
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