Natural compounds from medicinal mushroom may calm harmful brain inflammation
Scientists have discovered that ganoderic acids, a group of natural compounds extracted from the medicinal mushroom Ganoderma lucidum (Reishi), could help protect the brain after an ischemic stroke by blocking excessive inflammation. This international research effort brought together a diverse team of scientists from prominent institutions including Peking University, the China Academy of Chinese Medical Sciences, China Agricultural University, the Shanghai Academy of Agricultural Sciences, Fujian Agriculture and Forestry University, and Wenzhou Medical University in China. Contributions also came from the Frederick National Laboratory for Cancer Research, the National Cancer Institute, and the National Institutes of Health (NIH) in the USA.
Natural ganoderic acids from Reishi mushrooms may protect the brain after stroke by blocking harmful inflammation
Why brain inflammation matters after a stroke
An ischemic stroke occurs when blood flow to a specific region of the brain is obstructed, leading to immediate oxygen deprivation. Even after medical intervention restores blood circulation, the brain frequently continues to endure secondary damage because resident immune cells known as microglia become hyperactive. These activated cells release a barrage of inflammatory chemicals that exacerbate the initial injury, compromise the integrity of the blood-brain barrier, and induce the death of neighboring neurons. Consequently, researchers have been actively seeking safer therapeutic interventions capable of mitigating this destructive inflammatory cascade without causing significant adverse effects.
Ganoderic acids delivered impressive protection
Utilizing mouse models with experimentally induced ischemic stroke, investigators determined that treatment with ganoderic acids significantly enhanced neurological function and reduced the overall volume of damaged brain tissue. The treatment was also effective in lowering cerebral edema, or brain swelling. A critical benefit observed was the preservation of the blood-brain barrier, achieved by restoring the expression of protective structural proteins such as ZO-1 and Occludin, which are essential for maintaining tight junctions between cells. This restoration helped reduce leakage into the brain tissue. Subsequent microscopic examination of brain tissue revealed that treated animals exhibited healthier neurons and notably less structural damage compared to controls.
In controlled laboratory experiments utilizing mouse microglial cells, the compounds drastically reduced the presence of inflammatory mediators, including TNF-α, COX-2, and iNOS. Importantly, these suppressive effects were achieved without inducing toxicity in the cells, suggesting that the natural compounds can effectively dampen harmful inflammation while maintaining a favorable safety profile.
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Scientists identified the most powerful compound
This Thailand Medical News report emphasizes that researchers isolated and screened 19 distinct ganoderic acid compounds to compare their biological activity. Among the major compounds subjected to testing, Ganoderic Acid K (GA-K) consistently demonstrated the most potent anti-inflammatory properties. It succeeded in reducing the secretion of critical inflammatory cytokines, specifically TNF-α and IL-6, by more than 50%, a performance that surpassed other major molecules identified within the mushroom extract.
Further mechanistic experiments clarified the biological processes underlying these results. Several ganoderic acid compounds, with GA-K being particularly effective, were found to bind directly to a protein called myeloid differentiation factor 2 (MD2). By attaching to MD2, these compounds successfully hindered its ability to interact with Toll-like receptor 4 (TLR4), which is a primary initiator of inflammatory signaling pathways. This inhibition effectively blocked the activation of the MAPK and NF-κB pathways, which are normally responsible for driving the damaging inflammation observed following a stroke. To validate this target, researchers observed that mice genetically engineered to lack MD2 were naturally shielded from stroke injury, thereby confirming that MD2 is a key focal point for therapeutic intervention.
A promising direction for future stroke treatments
While these discoveries were derived primarily from laboratory cell cultures and animal models, they indicate that ganoderic acids, and specifically Ganoderic Acid K, possess strong potential as candidates for future stroke therapies. Their complex capacity to reduce inflammation, preserve brain tissue architecture, safeguard the blood-brain barrier, and promote neurological recovery renders them highly attractive subjects for continued clinical development. However, rigorous human studies will still be required to establish safety protocols, appropriate dosing regimens, and clinical efficacy before these natural compounds can be adopted for routine use in patient care.
The study findings were published in the peer reviewed journal: Exploration.
https://onlinelibrary.wiley.com/doi/10.1002/EXP.20240147
https://www.thailandmedical.news/articles/herbs-and-phytochemicals
