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Prospects for cannabinoid therapies in viral encephalitis
Marylou V Solbrig1, Yijun Fan, Paul Hazelton
1Department of Medicine (Neurology), University of Manitoba, Winnipeg, MB, Canada; Department of Medical Microbiology, University of Manitoba, Winnipeg, MB, Canada.
Brain Research
|September 12, 2013
Summary
Cannabinoids show promise for brain disorders. A selective CB2 agonist, HU-308, reduced inflammation and viral load in a rodent model of viral encephalitis, unlike a general cannabinoid agonist.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Cannabinoids are explored for neuroinflammation and neurodegenerative diseases.
- Their long-term efficacy during persistent central nervous system (CNS) viral infections remains unclear.
- Borna Disease (BD) virus in rodents models chronic viral encephalitis.
Purpose of the Study:
- To investigate the long-term effects of cannabinoid receptor agonists on neurogenesis, gliogenesis, and viral load in chronic viral encephalitis.
- To compare the efficacy of a general cannabinoid agonist (WIN55,212-2) with a selective CB2 agonist (HU-308).
Main Methods:
- Rodent model of Borna Disease virus-induced chronic viral encephalitis.
- Two-week treatment with WIN55,212-2 (general agonist) or HU-308 (selective CB2 agonist).
- Assessment of histopathology, neurogenesis (BrdU+ cells), gliogenesis, and viral load in the prefrontal cortex, striatum, and hippocampus.
Main Results:
- The selective CB2 agonist HU-308 increased neurogenesis in the prefrontal cortex and striatum.
- HU-308 differentially regulated glial cells and reduced immune activation.
- WIN55,212-2 showed tolerance to anti-inflammatory effects, while HU-308 did not.
- Both agonists reduced viral load in the hippocampus, with limited effect in other regions.
Conclusions:
- Selective CB2 receptor agonism with HU-308 offers a non-tolerizing mechanism to control CNS inflammation during viral encephalitis.
- HU-308 reduces microglia activation and partially limits viral infection.
- This highlights a potential therapeutic strategy using nonpsychotropic cannabinoids for viral CNS disorders.
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