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The analgesia induced by intrathecal injection of ruthenium red
Tsuyako Ohkubo1, Manabu Shibata, Hiroshi Takahashi
1Department of Pharmacology, Fukuoka Dental College, 700 Ta, Sawara-ku, Fukuoka 814-01 Japan.
Intrathecally (i.t.) administered ruthenium red (40, 80, 160 ng) dose-dependently inhibited formalin-induced nociceptive response. Ruthenium red caused a significant inhibition of pain-related behavioral responses induced by i.t. capsaicin but not by i.t. substance P. These results suggest that ruthenium red produces analgesia by inhibiting the release of neuropeptides in the spinal cord.
Intrathecally (i.t.) administered ruthenium red (40, 80, 160 ng) dose-dependently inhibited formalin-induced nociceptive response. Ruthenium red caused a significant inhibition of pain-related behavioral responses induced by i.t. capsaicin but not by i.t. substance P. These results suggest that ruthenium red produces analgesia by inhibiting the release of neuropeptides in the spinal cord.