Microbiota and the Endocannabinoid System
Scientific understanding of the role of the endocannabinoid system in modulating human health continues to expand, including in areas where this vast network of receptors and signaling molecules gets little, if any, attention outside academic journals. Case in point: the gut microbiome.
Two recently published studies out of China could help change that by identifying how specific gut microbiota may confer health impacts through changes in the endocannabinoid system (ECS).
Much has been made in popular media of the gut microbiome’s manifold role in human health. The tens of trillions of bacteria, archaea, fungi, and viruses living mainly in the large intestine exert a major influence on digestion and metabolism, immune function, brain function and mental health, metabolic and cardiovascular health, and more.
Less well known is the potential role of the ECS in mediating these complex relationships. Preclinical evidence from animal and lab models suggests that crosstalk between the ECS and gut microbiota – sometimes called the “microbiome-endocannabinoid axis” – could help explain much of what we now know about how diet, gut microbiome, and health are inextricably linked.
Protective against atherosclerosis
One significant clinical diagnosis already tied to the gut microbiome is atherosclerosis, where dietary fat, cholesterol, and other substances build up in the walls of arteries to form hard plaques that restrict blood flow and increase the risk of heart attack, coronary heart disease, and other potentially fatal outcomes.
A 2016 study in the journal Circulation found evidence in mice that a particular gut bacterium called Akkermansia muciniphila (A. muciniphila) protects against atherosclerosis by altering metabolic processes. Other lab and animal studies have suggested that A. muciniphila production in the gut is promoted by a high-fiber diet rich in polyphenols from foods like berries, grapes, cranberries, pomegranate, cocoa, and green tea – and impaired by a traditional western diet high in sugar and ultra-processed foods.
More recently, researchers have probed the role of the endocannabinoid system in mediating such effects given its concentration in the gastrointestinal tract and greater role within the body as a regulator of homeostasis.
Seeking to learn more about the protective effects of A. muciniphila on atherosclerosis and to elucidate underlying mechanisms including through the endocannabinoid system’s CB2 receptor, a team of researchers in China measured aortic plaque and systemic inflammation in mice fed a high-fat diet.
The CB2 connection
Sure enough, mice receiving subsequent supplementation with A. muciniphila showed improved outcomes over controls that did not.
This aligned with previous findings. But what the researchers did next, as reported in their June 2026 article in the Journal of Functional Foods, moved the science forward by demonstrating that A. muciniphila’s beneficial effect was associated with elevated blood levels of the endocannabinoids anandamide (AEA) and 2-arachidonoylglycerol (2-AG).
The researchers then tested this association through additional experimentation. “CB2 agonist administration sustained the protective effects of A. muciniphila, whereas CB2 antagonism abolished these protections, leading to increased plaque areas and elevated expression of vascular adhesion molecules,” the authors write.
These findings position A. muciniphila as a “potent” functional food ingredient for the prevention of atherosclerosis via the ECS and CB2-dependent signaling, they conclude.
Friendly gut bacteria versus Alzheimer’s
Another recent paper out of China made similar connections. In May, researchers with Wenzhou Medical University published an article in the Journal of Integrative Neuroscience focusing on the bacterium Lactobacillus mucosae. Naturally found in the gastrointestinal tract of humans and other animals, L. mucosae is considered a “friendly” bacterium that produces lactic acid by breaking down sugars.
Independent of its role in energy production, however, the researchers studied L. mucosae’s neuroprotective effects in Alzheimer’s disease, a connection first suggested in some previous work, including a 2023 study in Nutrients.
Seeking to better understand the mechanism behind this potential effect, the Chinese researchers treated mice for four weeks with L. mucosae, then evaluated various markers of a mouse model of Alzheimer’s. Results showed that treatment with L. mucosae as a probiotic significantly decreased cognitive impairment, neuronal damage, amyloid-β deposition, and Tau phosphorylation.
The researchers also measured oxidative stress (a marker of neuronal damage associated with Alzheimer’s) and the expression of cannabinoid receptor CB2. Ultimately, they found that reductions in oxidative stress were mediated by increased activation of the CB2 receptor.
Based on these results, the authors concluded that L. mucosae confers neuroprotection in a mouse model of Alzheimer’s through CB2-mediated pathways, highlighting the bacterium’s therapeutic potential as a novel probiotic intervention.
A high-fiber diet
As with A. muciniphila, L. mucosae is promoted in the gut by a high-fiber diet. Researchers are also exploring ways to support specific gut microbiota directly through targeted supplements.
Theoretically, at least, increased production of these beneficial bugs could lead to health benefits in a variety of areas given the gut microbiome’s proven relevance to overall human health.
And behind the scenes — underlying it all whether acknowledged or not — is the endocannabinoid system.
Nate Seltenrich is a longtime journalist and editor in the San Francisco Bay Area who has reported about cannabis, psychedelics, and the human health effects of environmental pollutants, among many other topics.
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Sources:
Li, Jin, A Lin, Shaoqiang, Vanhoutte, Paul M, Woo, Connie W, Xu, Aimin. Akkermansia Muciniphila Protects Against Atherosclerosis by Preventing Metabolic Endotoxemia-Induced Inflammation. J Circulation 115.019645. doi:10.1161/CIRCULATIONAHA
Weixi Wang, Chenchen Feng, Yi Lou, Chu Liu, Guilin Chang, Kan Xu, Weiying Ren, Man Luo, Yu Hu, Lin Zhu, Akkermansia muciniphila attenuates high-fat diet-induced atherosclerosis through regulation of the endocannabinoid system. Journal of Functional Foods, Volume 141, 2026, 107325, ISSN 1756-4646, https://doi.org/10.1016/j.jff.2026.107325.
Kong Y, Lv X, Yang Y, Li Q, Dai C, Lin X, Liu J, Li J. Lactobacillus mucosae Reduces Neuronal Oxidative Stress in Alzheimer’s Disease via the Regulation of CB2 Signaling. J Integr Neurosci. 2026 May 19;25(5):48598. doi: 10.31083/JIN48598. PMID: 42216640.
Ma X, Kim JK, Shin YJ, Son YH, Lee DY, Park HS, Kim DH. Alleviation of Cognitive Impairment-like Behaviors, Neuroinflammation, Colitis, and Gut Dysbiosis in 5xFAD Transgenic and Aged Mice by Lactobacillus mucosae and Bifidobacterium longum. Nutrients. 2023 Jul 29;15(15):3381. doi: 10.3390/nu15153381. PMID: 37571319; PMCID: PMC10421059.
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