Abstract
Aim: To investigate effects of the cyclin-dependent kinase5 (Cdk5) inhibitor roscovitine on formalin-induced nociceptive responses in rats. Methods: The flinch response as a methood of pain threshold measurement and intrathecal injection techniques were used. Cdk5 and phosphorylation of its downstream target, DARPP-32 (dopamine- and cAMP-regulated phosphoprotein of Mr 32 kDa), were investigated by Western blot analysis. Results: Rats demonstrated a typical flinch response after formalin injection. Intrathecal roscovitine injections significantly suppressed the flinch response in a dose-dependent manner. Western blot analysis showed that phosphorylated DARPP-32 at Thr75 increased in concentration after formalin hyperalgesia, with this effect reduced by roscovitine administration. This antinociception was partially attenuated by administration of naloxone before the formalin test. Conclusion: DARPP-32 phosphorylation is involved in acute inflammatory pain response. Intrathecal roscovitine administration attenuates formalin-induced nociceptive responses and there is potential for further application.
Original language | English |
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Pages (from-to) | 46-50 |
Number of pages | 5 |
Journal | Acta Pharmacologica Sinica |
Volume | 26 |
Issue number | 1 |
DOIs | |
State | Published - 01 2005 |
Externally published | Yes |
Keywords
- Cyclin-dependent kinase-5
- DARPP-32
- Roscovitine