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Cdk5: a new player in pain signaling
Tej K Pareek1, Ashok B Kulkarni
1Functional Genomics Section, Craniofacial Developmental Biology and Regeneration Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA.
Cell Cycle (Georgetown, Tex.)
|March 23, 2006
Summary
Cyclin-dependent kinase 5 (Cdk5) plays a key role in pain signaling and opioid tolerance. Targeting Cdk5 may offer new strategies for developing effective pain relief medications.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Cyclin-dependent kinase 5 (Cdk5) is crucial for brain development and function.
- While implicated in neuronal functions, its role in the peripheral nervous system and pain signaling was unclear.
- Cdk5 requires association with p35 or p39 for kinase activity.
Purpose of the Study:
- To investigate the role of Cdk5 in peripheral pain signaling and inflammatory responses.
- To explore the involvement of Cdk5 in opioid tolerance.
- To assess Cdk5 as a potential target for analgesic drug development.
Main Methods:
- Utilized p35 knockout (p35(-/-)) and p35-overexpressing transgenic mice (Tgp35).
- Examined nociceptive responses to thermal stimuli.
- Investigated Cdk5 regulation of mitogen-activated protein kinase kinase1/2 (MEK1/2) activity during inflammation.
- Assessed nociceptive responses after chronic morphine exposure.
Main Results:
- Cdk5 regulates MEK1/2 activity via a negative feedback loop in peripheral inflammation.
- Altered nociceptive responses were observed in p35(-/-) and Tgp35 mice.
- Differential responses to chronic morphine suggest Cdk5's importance in opioid tolerance.
Conclusions:
- Cdk5 plays a significant molecular role in pain signaling.
- Cdk5 activity is important for the development of opioid tolerance.
- Cdk5 represents a promising molecular target for novel analgesic drug development.
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