Review of How Cannabinoids Interact With the Immune System and Their Potential for Treating Inflammation | Research

The takeaway

Research on immune cells shows cannabinoids can modulate immune function and cytokine secretion, suggesting potential applications for treating inflammatory diseases, though evidence comes primarily from animal and cell studies.

Read this if you want to understand the science behind claims that cannabis has anti-inflammatory properties.

Cannabinoid receptors are present on immune cells including T cells and macrophages

What the researchers found

Since the discovery of cannabinoid receptors on immune system cells, researchers have investigated how cannabinoids affect immune function. This review compiled evidence from chronic cannabis smokers, animal studies, and in vitro experiments on immune cells including T cells and macrophages.

The evidence shows cannabinoids can modulate both the function and secretion of cytokines from immune cells. These immunomodulatory effects operate through cannabinoid receptors and suggest potential therapeutic applications for inflammatory diseases.

The review highlighted the role of endogenous cannabinoids (endocannabinoids) as natural ligands that also demonstrate immunomodulatory properties, supporting the idea that the endocannabinoid system plays a role in regulating immune responses.

Why it matters

Understanding how cannabinoids interact with the immune system is foundational for developing targeted treatments for autoimmune and inflammatory conditions. The presence of cannabinoid receptors on immune cells suggests the endocannabinoid system naturally participates in immune regulation.

The numbers in context

Two cannabinoid receptor subtypes (CB1, CB2) identified on immune cells. Evidence compiled from chronic cannabis smoker studies, animal models, and in vitro immune cell experiments.

How the study worked

Narrative review article compiling evidence from studies on chronic cannabis smokers, animal models, and in vitro experiments on immune cells (T cells, macrophages). Examined the function and role of cannabinoid receptors within immunological cellular function.

What this study cannot tell us

Much of the evidence comes from cell culture and animal studies, which may not directly translate to humans. Studies from chronic cannabis smokers involve confounding factors. The review covers a broad range of inflammatory conditions without deep evidence for any specific one.

How to read the evidence

Narrative review drawing primarily on animal and cell culture studies. Provides a theoretical framework but limited direct clinical evidence for treating human inflammatory diseases.

When this study was published

Published in 2005. Research on cannabinoids and inflammation has advanced considerably since then, with more clinical data now available.

The bigger picture

The immunomodulatory properties of cannabinoids have become one of the most active areas of cannabinoid research. Understanding how endocannabinoids regulate immune function has implications not just for cannabis use but for developing entirely new classes of anti-inflammatory medications.

Questions still open

Can cannabinoid-based treatments be developed that target immune function without psychoactive effects? Which specific inflammatory diseases are most likely to benefit from cannabinoid therapies?

Common questions

Can cannabis treat inflammatory diseases?

The evidence reviewed here shows cannabinoids can modulate immune cell function in laboratory settings. Whether this translates to effective treatment for specific inflammatory diseases in humans requires clinical trials, which were limited at the time of this review.

Does the body produce its own cannabinoids that affect the immune system?

Yes. Endocannabinoids, the body's natural cannabinoid-like molecules, also demonstrate immunomodulatory properties. This suggests the endocannabinoid system plays a natural role in regulating immune responses.

Read the original research

Cannabinoids and the immune system: potential for the treatment of inflammatory diseases?

Journal of neuroimmunology, 166(1-2), 3-18

View on PubMed ↗

Citation

Croxford, J Ludovic; Yamamura, Takashi. (2005). Cannabinoids and the immune system: potential for the treatment of inflammatory diseases?. Journal of neuroimmunology, 166(1-2), 3-18.