TY - JOUR
T1 - Thiamine and cyanocobalamin relieve neuropathic pain in rats
T2 - Synergy with dexamethasone
AU - Caram-Salas, Nadia L.
AU - Reyes-García, Gerardo
AU - Medina-Santillán, Roberto
AU - Granados-Soto, Vinicio
PY - 2006/5
Y1 - 2006/5
N2 - Treatment of neuropathic pain is an area of largely unmet medical need. Therefore, this pain may require the development of novel drug entities. In the search for alternatives, B vitamins have been found to be a clinically useful pharmacological tool for patients with neuropathic pain. However, preclinical studies supporting this use are lacking. In this study, we assessed the possible antiallodynic effects of thiamine, pyridoxine, and cyanocobalamin as well as dexamethasone and their combination on spinal nerve ligation induced allodynia. Subcutaneous administration of thiamine (75-600 mg/kg), pyridoxine (75-600 mg/kg), cyanocobalamin (0.75-6 mg/ kg), and dexamethasone (4-32 mg/kg) significantly reduced tactile allodynia in rats. Maximal antiallodynic effects were reached with 600 mg/kg of thiamine (∼58%), 600 mg/kg of pyridoxine (∼22%), 6 mg/kg of cyanocobalamin (∼73%), and 32 mg/kg of dexamethasone (∼68%). Since a small antiallodynic effect was observed with pyridoxine, this drug was not further analyzed in the combinations. Coadministration of thiamine or cyanocobalamin and dexamethasone remarkably reduced spinal nerve ligation induced allodynia (∼90%), showing a synergistic interaction between either thiamine or cyanocobalamin and dexamethasone. Our data indicate that thiamine and pyridoxine as well as the combination of B vitamins and dexamethasone are able to reduce tactile allodynia in rats and suggest the possible clinical use of these drugs in the treatment of neuropathic pain in human beings.
AB - Treatment of neuropathic pain is an area of largely unmet medical need. Therefore, this pain may require the development of novel drug entities. In the search for alternatives, B vitamins have been found to be a clinically useful pharmacological tool for patients with neuropathic pain. However, preclinical studies supporting this use are lacking. In this study, we assessed the possible antiallodynic effects of thiamine, pyridoxine, and cyanocobalamin as well as dexamethasone and their combination on spinal nerve ligation induced allodynia. Subcutaneous administration of thiamine (75-600 mg/kg), pyridoxine (75-600 mg/kg), cyanocobalamin (0.75-6 mg/ kg), and dexamethasone (4-32 mg/kg) significantly reduced tactile allodynia in rats. Maximal antiallodynic effects were reached with 600 mg/kg of thiamine (∼58%), 600 mg/kg of pyridoxine (∼22%), 6 mg/kg of cyanocobalamin (∼73%), and 32 mg/kg of dexamethasone (∼68%). Since a small antiallodynic effect was observed with pyridoxine, this drug was not further analyzed in the combinations. Coadministration of thiamine or cyanocobalamin and dexamethasone remarkably reduced spinal nerve ligation induced allodynia (∼90%), showing a synergistic interaction between either thiamine or cyanocobalamin and dexamethasone. Our data indicate that thiamine and pyridoxine as well as the combination of B vitamins and dexamethasone are able to reduce tactile allodynia in rats and suggest the possible clinical use of these drugs in the treatment of neuropathic pain in human beings.
KW - Allodynia
KW - Cyanocobalamin
KW - Dexamethasone
KW - Thiamine
UR - http://www.scopus.com/inward/record.url?scp=33744828256&partnerID=8YFLogxK
U2 - 10.1159/000092643
DO - 10.1159/000092643
M3 - Artículo
SN - 0031-7012
VL - 77
SP - 53
EP - 62
JO - Pharmacology
JF - Pharmacology
IS - 2
ER -