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Activation of the CB1 cannabinoid receptor protects cultured mouse spinal neurons against excitotoxicity
M E Abood1, G Rizvi, N Sallapudi
1Forbes Norris MDA/ALS Research Center, 2351 Clay Street, Suite 416, California Pacific Medical Center, San Francisco, CA 94115, USA. mabood@cooper.cpmc.org
Abstract:
Significant advances are being made towards understanding the genetic basis for spinal neurodegenerative diseases, however, effective pharmacotherapy remains elusive. One of the primary theories underlying neuron vulnerability is susceptibility to excitotoxicity. We present for the first time evidence that the activation of the CB(1) cannabinoid receptor effectively modulates kainate toxicity in primary neuronal cultures prepared from mouse spinal cord. Addition of Delta(9)-tetrahydrocannabinol to the culture medium attenuated the toxicity produced by kainate. The CB(1) receptors were localized to spinal neurons and astrocytes. The neuroprotective effect was blocked with the CB(1) receptor antagonist, SR141716A, indicating a receptor-mediated effect.
Insights
Delta(9)-tetrahydrocannabinol, a cannabinoid, protected spinal neurons from excitotoxicity by activating CB(1) receptors. This finding offers a potential therapeutic target for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Spinal neurodegenerative diseases lack effective pharmacotherapy.
- Excitotoxicity is a key mechanism of neuron vulnerability.
Purpose of the Study:
- To investigate the neuroprotective effects of CB(1) receptor activation against excitotoxicity in the spinal cord.
- To explore the potential of cannabinoids as a therapeutic strategy for spinal neurodegenerative conditions.
Main Methods:
- Primary neuronal cultures from mouse spinal cord were utilized.
- Kainate was used to induce excitotoxicity.
- The effects of Delta(9)-tetrahydrocannabinol and the CB(1) antagonist SR141716A were assessed.
Main Results:
- Delta(9)-tetrahydrocannabinol significantly attenuated kainate-induced toxicity.
- CB(1) receptors were identified on spinal neurons and astrocytes.
- The neuroprotective effect of Delta(9)-tetrahydrocannabinol was blocked by SR141716A.
Conclusions:
- Activation of the CB(1) cannabinoid receptor confers neuroprotection against excitotoxicity in the spinal cord.
- Cannabinoids represent a promising therapeutic avenue for managing spinal neurodegenerative diseases.