Abstract
AIM: To investigate the effect of cyclin-dependent kinase 5 (Cdk5) inhibitor roscovitine on the morphine antinociceptive tolerance development in rats. METHODS: Tail-flick test as pain threshold measurement and intrathecal injection techniques were used. RESULTS: Intrathecal roscovitine infusion alone produced an antinociceptive effect. Tolerance was induced by continuous intrathecal infusion of morphine 5 μg/h for 5 d. Co-administration of intrathecal roscovitine 1 μg/h for 5 d enhanced the morphine antinociceptive effect in tolerant rats. It also caused a shift in the morphine antinociceptive dose Cresponse curve to the left when co-administered with morphine during tolerance induction, and caused a 67 % reduction in the increase in the ED 50 of morphine (dose producing 50 % of the maximum response). CONCLUSION: Cdk5 modulation is involved in the antinociceptive tolerance of morphine. Intrathecal roscovitine administration could attenuate this tolerance development.
| Original language | English |
|---|---|
| Pages (from-to) | 1027-1030 |
| Number of pages | 4 |
| Journal | Acta Pharmacologica Sinica |
| Volume | 25 |
| Issue number | 8 |
| State | Published - 08 2004 |
| Externally published | Yes |
Keywords
- Cyclin-dependent kinase 5
- Morphine
- Roscovitine