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Research Article

VENLAFAXINE-INDUCED DEPRESSION OF WIND-UP ACTIVITY IN MONONEUROPATHIC RATS IS POTENTIATED BY INHIBITION OF BRAIN 5-HT1A RECEPTOR EXPRESSION IN VIVO

, , , , , , , & show all
Pages 229-242 | Published online: 07 Jul 2009
 

Abstract

Antinociceptive effects of inhibiting 5-HT1A receptor expression by intracerebroventricular administration of an antisense oligodeoxynucleotide were studied in mononeuropathic rats. A 7-day period of treatment with the antisense produced: (i) reduction of mechanical hyperalgesia in the neuropathic hindlimb starting from day 5 of treatment, (ii) decrease of the hypothermic effect of 8-OH-DPAT challenge on day 6 of treatment, and (iii) potentiation of the inhibitory effect of velafaxine on spinal wind-up activity on day 7 of treatment. Results suggest a counteracting role of somatodendritic 5-HT1A receptors of raphe nuclei neurons in the antinociceptive efficacy of antidepressants with serotonergic spectrum in neuropathic pain

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