A major study has shown that THC (tetrahydrocannabinol), the most abundant psychoactive cannabinoid in cannabis, plays a key role in protecting neurons from the damaging effects of Alzheimer’s Disease.
Researchers at the Salk Institute released the results and analysis of the study, which were published in Nature. The study showed that THC was able to both protect neurons from the degenerative effects of the amyloid beta plaques and relieve the damaging inflammation these plaques cause.
“Although other studies have offered evidence that cannabinoids might be neuroprotective against the symptoms of Alzheimer’s, we believe our study is the first to demonstrate that cannabinoids affect both inflammation and amyloid beta accumulation in nerve cells,”
said Salk Professor David Schubert, the senior author of the paper.
The research involved modifying neurons to have high amounts of amyloid beta to cause the same plaque formation seen in the neurons of Alzheimer’s patients. Left alone, these neurons developed inflammation and died. But when researchers exposed identical neurons to cannabinoids, the inflammation was reduced as well as the plaque, allowing the cells to live.
What’s more, the study shows that THC relieves the specific type of inflammation caused by Alzheimer’s. Typically, conventional NSAID drugs block COX receptors, relieving a variety of inflammatory conditions. This study provided evidence that the neuron’s LOX receptors are the true culprits of inflammation caused by the plaques in Alzheimer’s, suggesting why NSAID drugs have proven to be ineffective in treating the disease. While the study showcases the medicinal qualities of cannabis, it also provides insight into the pathology of Alzheimer’s and other inflammatory conditions that don’t respond to conventional drugs.
One major criticism that the researchers addressed was the fact that they used neurons instead of a mouse model. Many believe that it’s the activation of other brain cells besides neurons that contribute to the development of Alzheimer’s. Conducting a new study with a mouse model or a clinical trial would be the next step in furthering the research. In the meantime, this study has pinpointed the factors involved in Alzheimer’s inflammation, and that cannabinoids may be key in treating this devastating disease.
Many are familiar with the major cannabinoids found in cannabis, such as THC and CBD, which have such great efficacy for conditions like depression, PTSD, and epilepsy. But cannabinoids are only part of the picture. Terpenes are like molecular cousins to cannabinoids and serve the primary role of delivering a wide variety of alluring aromas to cannabis flowers, but also offer a wide range of medicinal benefits as well.
In addition to aroma, terpenes deliver sometimes great medicinal value. They have been found to fight cancer and act as an analgesic (pain killer). Like amino acids, terpenes are powerful building blocks within the plant’s physiology that aid in the production of vitamins, hormones, pigments, resins, and — yes, that most prized part of the herb — cannabinoids. Cannabis plants release more terpenes when temperatures are higher (one reason they emit strong odors during the peak of harvest season).
More than 200 terpenes are available in the cannabis plant, while more than 20,000 exist in nature. They are produced in the small resin glands that appear primarily on the surface of the flowers and sugar leaves of cannabis plants called trichomes. It is estimated that there are nearly 1000 strains of cannabis that have been bred. Each of these features a distinct and unique mix of terpenes, something called a terpene profile.
Cannabis and cannabis products — such as concentrates — sold in legal and regulated states often feature a label providing a laboratory analysis that lists the exact percentages of cannabinoids and terpenes. Often, lab techs, budtenders, and pot nerds will discuss particular strains or extracts of cannabis in terms of their terpene profiles and how the overall efficacy of one profile (an individual of a particular strain) compares with other samples or methods of extracting concentrates.
Major terpenes include myrcene, pinene, and limonene. Myrcene, which conveys earthy and clove-like odors, determines whether a particular strain is indica or sativa by its percentage within the plant (further illustrating the important role played by terpenes). Pinene, a terpene also found in evergreens, has been found to increase mental focus and energy and acts as a bronchodilator — making it helpful for asthma sufferers. Limonene, as its name implies, provides an aroma of citrus and is found not only in cannabis, but also oranges, grapefruits, lemons, and limes. It has been revealed to alleviate depression and aid in digestion.
Terpenes are very volatile, delicate molecules that are easily destroyed by heat and oxidation. Popular cannabis concentrates, like BHO and CO2 oil, are mostly void of terpenes. One new extraction method called live resin preserves the terpene profile of cannabis plants. This process involves cryogenically freezing plants immediately after harvest and then using a laboratory extraction process (backyard brewers need not apply) to remove and isolate a more accurate representation of a particular plant’s mix of cannabinoids and terpenes.
What is Linalool?
Linalool, one of the minor terpenes found in cannabis, conveys a floral aroma, sometimes with a hint of spice. More than 200 species of plants produce linalool, including a variety of mints and herbs. More important, linalool serves many roles in relieving a number of symptoms, including pain, depression, seizures, inflammation (similar to limonene), and even insomnia (because it acts as a sedative). Its tranquilizing effects are helpful for those suffering with many types of psychosis.
- Analgesic: Linalool is helpful for conditions like multiple sclerosis, dystonia, arthritis, post-operative pain, and chronic pain from any source because it is a pain killer. Combined with cannabinoids of the same efficacy, linalool can be a reinforcing agent in a patient’s struggle to manage pain, especially if they are trying to avoid or reduce use of opiates such as Vicodin, Percocet, and Oxycontin.
- Antidepressant: More than 20 million people in the United States alone suffer from sometimes debilitating depression. This common psychological ailment can negatively affect one’s career, personal relationships, and even physical health. Linalool, when combined with cannabinoids like THC that are also effective in helping alleviate depression, helps form an overall strategy for using cannabis to treat these types of disorders.
- Anti-Convulsant: Just as chemotherapy is used to treat conditions other than cancer, seizures afflict those with conditions other than epilepsy, such as traumatic brain injury, brain tumors, and hydrocephalus. Most seizures feature a duration of between 30 seconds and two minutes. Typically, they do not cause lasting harm, although they seizures often very taxing, painful, or exhausting for sufferers. Seizures that last longer than five minutes are considered life threatening.
- Anti-Inflammatory: Those suffering from inflammation-based diseases, such as Crohn’s, arthritis, Alzheimer’s, asthma, fibromyalgia, dermatitis, IBS, lupus, and Parkinson’s, among many others, gain benefit from the anti-inflammatory properties of linalool (as well as a variety of anti-inflammatory cannabinoids).
- Sedative and Sleep Aid: It is estimated that 10-30 percent of people suffer from insomnia at some point in their lives, with 10 percent reported to experience chronic and severe sleep deprivation. Cannabinoids like CBN, when combined with terpenes such as linalool, help patients get the sleep they require to maintain homeostasis (balance) and health. Adequate sleep is critical for patients to most effectively fight their condition or disease.
Ancient cultures have used terpenes like linalool, available in a variety of aromatic herbs like cannabis, for millennia to treat a wide variety of conditions. 21st century research has confirmed the beliefs of these ancient civilizations, revealing strong medical efficacy for a variety of conditions.
A 2002 study published in the Journal of Phytomedicine revealed that linalool is a major anti-inflammatory agent, potentially helping with a variety of inflammation-related ailments, such as cancer, arthritis, and Crohn’s disease. The same research team, in a 2003 study, found linalool to also be a pain killer. These researchers again, in 2006, conducted another linalool study that further collected and examined data from animal models. This study reinforced the fact that linalool is a powerful anti-inflammatory.
2008 research published in the American Association of Nurse Anesthetists Journal supported the sedative qualities of linalool. The study estimated that 19 million Americans suffer from anxiety-related ailments, with 16 percent of people between the ages of 18 and 54 being patients of one or more anxiety conditions, which sometimes lead to substance abuse and mood disorders.
This study revealed linalool to be a powerful sedative that delivers real efficacy to those who suffer anxiety disorders and one of their most common side effects, insomnia. Concluded the study:
“Our data…suggested that linalool modulates the central nervous system by producing unconsciousness and degradation of motor movements.”
A 2010 study involving mice that employed three different sub-types of linalool found it to be an effective anticonvulsant, meaning it shows significant promise for those who suffer seizures, such as patients of epilepsy and brain tumors. Reported the study:
“Linalool…[was] effective in preventing tonic convulsions induced by transcorneal electroshock in the animals.”
More Research Needed
As with all areas of cannabis science, terpenes like linalool are in desperate need of well funded, robust research in the form of human trials. Until cannabis is dropped from Schedule I and real studies are permitted by reputable research institutions and laboratories, medical professionals and patients must play a guessing game in terms of the types and dosages of terpenes like linalool that are most appropriate for particular conditions.