A mouse model of sural nerve injury-induced neuropathy: gabapentin inhibits pain-related behaviors and the hyperactivity of wide-dynamic range neurons in the dorsal horn.
This study was conducted to make a new mouse model of neuropathic pain due to injury to a branch of the sciatic nerve. One of three branches (sural, tibial, and common peroneal nerves) of the sciatic nerve was tightly ligated, and mechanical and cool stimuli were applied to the medial part (tibial and common peroneal nerve territories) of the plantar skin. The three types of nerve injuries produced behavioral mechanical hypersensitivities, and the extent of the hypersensitivities after sural and tibial nerve ligation was larger than that of common peroneal nerve ligation. Sural nerve ligation did not affect motor function of the affected hind paw, but tibial and common peroneal nerve ligation produced motor dysfunction. These results suggest that the ligation of the sural nerve is the most suitable for behavioral study. Sural nerve ligation induced behavioral hypersensitivities to mechanical and cool stimuli, which were almost completely inhibited by gabapentin (30 mg/kg). Sural nerve ligation increased spontaneous activity and responses of the wide-dynamic range neurons in the lumbar dorsal horn, which were also almost completely inhibited by gabapentin (30 mg/kg). Sural nerve ligation provides a new mouse model of neuropathic pain, which is easy to prepare and sensitive to gabapentin.
Department of Applied Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama, Japan.
Yu
Y
Omori
Kenta
K
Kagaya
Ryugo
R
Enomoto
Atsushi
A
Sasaki
Tsugunobu
T
Andoh
Hiroshi
H
Nojima
Hiroki
H
Takahata
Yasushi
Y
Kuraishi
D000588:Amines / Q000627:therapeutic use*; D018712:Analgesics, Non-Narcotic / Q000627:therapeutic use*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D003080:Cold Temperature; D003509:Cyclohexanecarboxylic Acids / Q000627:therapeutic use*; D003627:Data Interpretation, Statistical; D004594:Electrophysiology; D000077206:Gabapentin; D008026:Ligation; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D010146:Pain / Q000188:drug therapy* / Q000523:psychology*; D010147:Pain Measurement / Q000187:drug effects; D010523:Peripheral Nervous System Diseases / Q000188:drug therapy* / Q000209:etiology; D010812:Physical Stimulation; D020671:Posterior Horn Cells / Q000187:drug effects*; D012584:Sciatic Nerve / Q000293:injuries / Q000473:pathology; D020426:Sciatic Neuropathy / Q000473:pathology; D013497:Sural Nerve / Q000293:injuries*; D005680:gamma-Aminobutyric Acid / Q000627:therapeutic use*
D000588:Amines; D018712:Analgesics, Non-Narcotic; D003509:Cyclohexanecarboxylic Acids; D005680:gamma-Aminobutyric Acid; D000077206:Gabapentin