Selective neurokinin-1 receptor antagonists are anti-hyperalgesic in a model of neuropathic pain in the guinea-pig.
Neuropathic pain is poorly managed by conventional analgesic therapy, such as non-steroidal anti-inflammatory drugs and opiates. The development of animal models of peripheral neural damage has aided in our understanding of the pathology and pharmacology of neuropathic pain. This report is the first clear demonstration using selective neurokinin-1 receptor antagonists of a potentially novel therapeutic approach to the treatment of neuropathic pain resulting from peripheral nerve damage in a guinea-pig model. The neurokinin-1 receptor antagonists, SDZ NKT 343 and LY 303,870 significantly reduced mechanical hyperalgesia following oral and intrathecal administration. (R,R)-SDZ NK T343, the enantiomer of SDZ NKT 343 did not show anti-hyperalgesic activity. RPR 100,893 showed significant anti-hyperalgesic activity only following intrathecal administration suggesting poor absorption or low level penetration of the blood-brain barrier. These results imply that neurokinin-1 receptor antagonists offer a new class of anti-hyperalgesic drugs with a largely central site of action in neuropathic pain.
Novartis Institute for Medical Sciences, London, UK.
E A
EA
Campbell
C T
CT
Gentry
S
S
Patel
M S
MS
Panesar
C S
CS
Walpole
L
L
Urban
D000284:Administration, Oral; D000818:Animals; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D006168:Guinea Pigs; D006930:Hyperalgesia / Q000188:drug therapy* / Q000503:physiopathology; D007211:Indoles / Q000494:pharmacology; D007278:Injections, Spinal; D054833:Isoindoles; D009281:Naphthalenes / Q000494:pharmacology*; D009412:Nerve Fibers / Q000502:physiology; D009437:Neuralgia / Q000188:drug therapy* / Q000503:physiopathology; D064729:Neurokinin-1 Receptor Antagonists; D009475:Neurons, Afferent / Q000187:drug effects / Q000502:physiology / Q000648:ultrastructure; D010880:Piperidines / Q000494:pharmacology; D011392:Proline / Q000031:analogs & derivatives* / Q000494:pharmacology; D018040:Receptors, Neurokinin-1 / Q000502:physiology*; D013116:Spinal Cord / Q000166:cytology
C096759:1-(N-(2-methoxybenzyl)acetylamino)-3-(1H-indol-3-yl)-2-(N-(2-(4-(piperidin-1-yl)piperidin-1-yl)acetyl)amino)propane; D007211:Indoles; D054833:Isoindoles; D009281:Naphthalenes; D064729:Neurokinin-1 Receptor Antagonists; D010880:Piperidines; D018040:Receptors, Neurokinin-1; C113385:SDZ NKT 343; C089835:RPR 100893; D011392:Proline