Fenchol, a natural compound abundant in some plants including basil, can help protect the brain against Alzheimer’s disease pathology, a preclinical study led by University of South Florida Health (USF Health) researchers suggests.
The new study published Oct. 5 in the Frontiers in Aging Neuroscience, discovered a sensing mechanism associated with the gut microbiome that explains how fenchol reduces neurotoxicity in the Alzheimer’s brain.
Emerging evidence indicates that short-chain fatty acids (SCFAs) – metabolites produced by beneficial gut bacteria and the primary source of nutrition for cells in your colon – contribute to brain health.
The abundance of SCFAs is often reduced in older patients with mild cognitive impairment and Alzheimer’s disease, the most common form of dementia. However, how this decline in SCFAs contributes to Alzheimer’s disease progression remains largely unknown.
Gut-derived SCFAs that travel through the blood to the brain can bind to and activate free fatty acid receptor 2 (FFAR2), a cell signaling molecule expressed on brain cells called neurons.
“Our study is the first to discover that stimulation of the FFAR2 sensing mechanism by these microbial metabolites (SCFAs) can be beneficial in protecting brain cells against toxic accumulation of the amyloid-beta (Aβ) protein associated with Alzheimer’s disease,” said principal investigator Hariom Yadav, Ph.D., professor of neurosurgery and brain repair at the USF Health Morsani College of Medicine, where he directs the USF Center for Microbiome Research.
One of the two hallmark pathologies of Alzheimer’s disease is hardened deposits of Aβ that clump together between nerve cells to form amyloid protein plaques in the brain.
The other is neurofibrillary tangles of tau protein inside brain cells. These pathologies contribute to the neuron loss and death that ultimately cause the onset of Alzheimer’s, a neurodegenerative disease characterized by loss of memory, thinking skills and other cognitive abilities.
Dr. Yadav and his collaborators delve into molecular mechanisms to explain how interactions between the gut microbiome and the brain might influence brain health and age-related cognitive decline. In this study, Dr. Yadav said, the research team set out to uncover the “previously unknown” function of FFAR2 in the brain.
The researchers first showed that inhibiting the FFAR2 receptor (thus blocking its ability to “sense” SCFAs in the environment outside the neuronal cell and transmit signaling inside the cell) contributes to the abnormal buildup of the Aβ protein causing neurotoxicity linked to Alzheimer’s disease.
Then, they performed large-scale virtual screening of more than 144,000 natural compounds to find potential candidates that could mimic the same beneficial effect of microbiota produced SCFAs in activating FFAR2 signaling.
Identifying a natural compound alternative to SCFAs to optimally target the FFAR2 receptor on neurons is important, because cells in the gut and other organs consume most of these microbial metabolites before they reach the brain through blood circulation, Dr. Yadav noted.
Dr. Yadav’s team narrowed 15 leading compound candidates to the most potent one. Fenchol, a plant-derived compound that gives basil its aromatic scent, was best at binding to the FFAR’s active site to stimulate its signaling.
Further experiments in human neuronal cell cultures, as well as Caenorhabditis (C.) elegans (worm) and mouse models of Alzheimer’s disease demonstrated that fenchol significantly reduced excess Aβ accumulation and death of neurons by stimulating FFAR2 signaling, the microbiome sensing mechanism.
When the researchers more closely examined how fenchol modulates Aβ-induced neurotoxicity, they found that the compound decreased senescent neuronal cells, also known as “zombie” cells, commonly found in brains with Alzheimer’s disease pathology.
Zombie cells stop replicating and die a slow death. Meanwhile, Dr. Yadav said, they build up in diseased and aging organs, create a damaging inflammatory environment, and send stress or death signals to neighboring healthy cells, which eventually also change into harmful zombie cells or die.
“Fenchol actually affects the two related mechanisms of senescence and proteolysis,” Dr. Yadav said of the intriguing preclinical study finding. “It reduces the formation of half-dead zombie neuronal cells and also increases the degradation of (nonfunctioning) Aβ, so that amyloid protein is cleared from the brain much faster.”
Before you start throwing lots of extra basil in your spaghetti sauce or anything else you eat to help stave off dementia, more research is needed – including in humans.
In exploring fenchol as a possible approach for treating or preventing Alzheimer’s pathology, the USF Health team will seek answers to several questions.
A key one is whether fenchol consumed in basil itself would be more or less bioactive (effective) than isolating and administering the compound in a pill, Dr. Yadav said.
“We also want to know whether a potent dose of either basil or fenchol would be a quicker way to get the compound into the brain.”
What Is Fenchol?
Fenchol, also known as Fenchyl alcohol or 2-fenchanol, is a monoterpenoid and isomer of the terpene borneol. It is known for its herbal scent and is a common ingredient to produce candles, shampoos, perfume, laundry detergent, and as a food additive.
One of the most common plants identified with this terpene is Basil; however, it is also present in eucalyptus leaves, wild celery, nutmeg, aster flowers, and citrus fruits. Its fragrance is perceived as herbal, earthy, and can taste like camphor or piney.
Unlike many other terpenes, fenchol doesn’t act as a sedative. It can have the effect of waking you up; yet, it is not a stimulant. It is recently being studied, among other benefits, for its antibiotic properties. Fenchol combined with Linalool and B-phellandrene could enhance antioxidant and anti-microbial actions.
Many antibiotics no longer work due to viruses and bacteria that are now resistant to them. This terpene, used together with cannabinoids or chemical compounds, can enhance the medicinal properties of cannabis. This phenomenon is commonly known as the entourage effect.
Fenchol Rich Cannabis Cultivars
Strains with high levels of Fenchol include:
● OG KUSH
● Banana Kush
As mentioned earlier, we are in the infancy stages of understanding the full potential of terpenes and their interactions. Fenchol has shown positive outcomes in several therapeutic areas, including its properties as an antibacterial, antioxidant, and anti-microbial.
The Scientific World Journal published in 2013 a study that showed that the combinations of the terpene Linalool with Fenchol demonstrated both anti-microbial and antioxidant properties (Guleria et al., 2013).
A study published in 2017 showed the efficacy of the Fenchol terpene against a large number of bacteria. In the study, the potency of fenchol was measured against Penicillin in combating 63 different bacterial strains. Although Penicillin is still more effective, fenchol was found to impede bacterial growth.
According to a study held in 2014, fenchol could play a role in pain relief. The results showed how fenchol (fenchyl alcohol) might inhibit an influential protein in the body’s pain signaling system (TRPA1 receptor). Besides, the study suggests that other monoterpenes possess pain relief properties (Takaishi, Uchida, Fujita, & Tominaga, 2014)
Fenchol In A Nutshell
The full potential effects of Fenchol is being researched and studied. Without a doubt, the power of terpenes is just starting to be understood.
Fenchol scent is considered refreshing and earthy, the reason why it is common in the fragrance industry. It also has potential therapeutic applications as an antioxidant, anti-inflammatory, anti-microbial, anti-fungal, and analgesic (pain reliever).
Understanding how terpenes work, both individually and in synergy with other terpenes and cannabinoids, holds great promise in maximizing overall health and wellbeing.
- Chouhan, S. (2017). Anti-microbial Activity of Some Essential Oils-Present Status and Future Perspectives. Medicines. 4(3): 58.
- Kotan, R., Kordali, S. (2007). Screening of antibacterial activities of twenty-one oxygenated monoterpenes. Journal of Biosciences. 62(7-8):507-13.
- Russo, E. (2011). Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects. British Journal of Pharmacology. (163)7: 1344-1364.
- Takaishi, M., Uchida, K., et al. (2014). Inhibitory effects of monoterpenes on human TRPA1 and the structural basis of their activity. Journal of Physiological Sciences. 64(1): 47–57.
- Guleria, S., Tiku, A., Koul, A., Gupta, S., Singh, G., & Razdan, V. (2013, May 28). Antioxidant and anti-microbial properties of the essential oil and extracts of Zanthoxylum alatum grown in north-western Himalaya. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3679694/
- A. K. (2007). Screening of antibacterial activities of twenty-one oxygenated monoterpenes. https://pubmed.ncbi.nlm.nih.gov/17913064/
More information: Atefeh Razazan et al, Activation of Microbiota Sensing – Free Fatty Acid Receptor 2 Signaling Ameliorates Amyloid-β Induced Neurotoxicity by Modulating Proteolysis-Senescence Axis, Frontiers in Aging Neuroscience (2021). DOI: 10.3389/fnagi.2021.735933