A 1:1 combination of CBD and THC (mimicking Sativex) suppressed TLR7/8-mediated inflammatory signaling in human immune cells more effectively than either cannabinoid alone.
immunology researchers, autoimmune disease specialists, cannabinoid pharmacologists
What the researchers found
TLR7/8 activation in macrophages and PBMCs promoted production of CXCL10, TNFα, and type I interferons through NF-κB, p38 MAPK, and IRF7 pathways. CBD and THC individually reduced these inflammatory mediators, but the 1:1 combination was most effective at dampening TLR7/8-induced inflammation in both cell types.
Why it matters
TLR7/8 are key sensors for viral infections and are implicated in autoimmune diseases. Showing that cannabinoids can modulate these pathways suggests potential therapeutic applications for viral inflammation and autoimmune conditions.
The numbers in context
1:1 CBD:THC ratio (mimicking Sativex/nabiximols formulation). Measured CXCL10, TNFα, type I IFNs. Assessed NF-κB activation, p38 MAPK phosphorylation, IRF7 transcription. Tested in both macrophage cell line and primary human PBMCs.
How the study worked
In vitro study using THP-1-derived macrophages and primary PBMCs from healthy donors. CL075 used as TLR7/8 agonist. CBD and THC tested alone and in 1:1 combination at multiple concentrations. Measured cytokines, chemokines, interferons, and signaling pathway activation.
What this study cannot tell us
In vitro study — cell culture results may not translate to whole-organism effects. Concentrations used may not reflect achievable tissue levels. Healthy donor PBMCs may respond differently than cells from patients with autoimmune conditions.
How to read the evidence
Well-designed in vitro study with multiple cell models, but lacks in vivo validation and clinical relevance is uncertain.
When this study was published
2025 publication.
The bigger picture
This study provides mechanistic evidence for why combination cannabinoid products like Sativex might have anti-inflammatory properties beyond pain relief. The entourage effect between CBD and THC appears to extend to immune modulation.
Questions still open
- Would this immune modulation be beneficial or harmful during active viral infections?
- Could cannabinoid-based TLR7/8 modulation help in autoimmune diseases?
Common questions
Do CBD and THC affect the immune system?
Could cannabis help with autoimmune diseases?
Read the original research
A 1:1 combination of cannabidiol and Δ9-tetrahydrocannabinol inhibit toll-like receptor 7- and 8-mediated inflammation in human immune cells.
European journal of pharmacology, 1003, 177878
Citation
Sun, Melody Cui; Hackett, Becky; Otálora-Alcaraz, Almudena; Downer, Eric J. (2025). A 1:1 combination of cannabidiol and Δ9-tetrahydrocannabinol inhibit toll-like receptor 7- and 8-mediated inflammation in human immune cells.. European journal of pharmacology, 1003, 177878. https://doi.org/10.1016/j.ejphar.2025.177878
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