Activating CB1 receptors raised seizure threshold in mice with brain-infecting parasites
In mice infected with Toxoplasma gondii, which lowers seizure threshold, CB1 receptor activation and endocannabinoid boosting raised the seizure threshold, while CB1 blockade worsened the proconvulsant effect.
Quick Facts
What This Study Found
The CB1 agonist ACEA, the endocannabinoid-boosting agent JZL184, and the CB2 antagonist AM630 all raised seizure thresholds in both healthy and Toxoplasma-infected mice. Conversely, CB1 antagonist AM251 and CB2 agonist HU308 lowered thresholds.
Key Numbers
Infected mice had substantially lower seizure thresholds than uninfected mice. JZL184, ACEA, and AM630 each raised thresholds in a dose-dependent manner.
How They Did This
Mice were infected with T. gondii cysts intraperitoneally. During acute and chronic infection, various cannabinoid receptor agonists and antagonists were administered intracerebroventricularly before measuring seizure threshold via pentylenetetrazole infusion.
Why This Research Matters
Toxoplasmosis affects roughly one-third of the global population and is a recognized risk factor for epilepsy. This study identifies the cannabinoid system as a potential therapeutic target for infection-related seizure vulnerability.
The Bigger Picture
The opposing roles of CB1 (protective) and CB2 (proconvulsant) receptors in infection-related seizures suggest that cannabinoid-based interventions would need careful receptor targeting to be therapeutically useful.
What This Study Doesn't Tell Us
Animal study using direct brain injection of drugs, which does not reflect practical human drug delivery. The Toxoplasma model may not fully replicate infection-related epilepsy in humans.
Questions This Raises
- ?Could cannabinoid-based therapies reduce epilepsy risk in people with chronic toxoplasmosis?
- ?Why do CB1 and CB2 receptors have opposing effects on seizure threshold?
Trust & Context
- Key Stat:
- CB1 activation raised seizure threshold in infected mice
- Evidence Grade:
- Preliminary: animal study with direct brain drug delivery.
- Study Age:
- Published in 2020 in Microbial Pathogenesis.
- Original Title:
- Cannabinoid receptors and the proconvulsant effect of toxoplasmosis in mice.
- Published In:
- Microbial pathogenesis, 144, 104204 (2020)
- Authors:
- Ghanbari, Mohammad-Mahdi(2), Joneidi, Marzieh, Kiani, Bahere, Babaie, Jalal, Sayyah, Mohammad
- Database ID:
- RTHC-02570
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
What is the connection between toxoplasmosis and seizures?
Toxoplasma gondii is a parasite that infects the brain and is known to increase the risk of epilepsy. This study confirmed that infected mice had lower seizure thresholds and showed that the cannabinoid system plays a role in this vulnerability.
Could cannabis help prevent seizures from brain infections?
This study suggests that targeting CB1 receptors could be protective, but the drugs were injected directly into the brain, which is not practical for humans. Whether oral cannabinoids would have similar effects is unknown.
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Cite This Study
https://rethinkthc.com/research/RTHC-02570APA
Ghanbari, Mohammad-Mahdi; Joneidi, Marzieh; Kiani, Bahere; Babaie, Jalal; Sayyah, Mohammad. (2020). Cannabinoid receptors and the proconvulsant effect of toxoplasmosis in mice.. Microbial pathogenesis, 144, 104204. https://doi.org/10.1016/j.micpath.2020.104204
MLA
Ghanbari, Mohammad-Mahdi, et al. "Cannabinoid receptors and the proconvulsant effect of toxoplasmosis in mice.." Microbial pathogenesis, 2020. https://doi.org/10.1016/j.micpath.2020.104204
RethinkTHC
RethinkTHC Research Database. "Cannabinoid receptors and the proconvulsant effect of toxopl..." RTHC-02570. Retrieved from https://rethinkthc.com/research/ghanbari-2020-cannabinoid-receptors-and-the
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.