Tag Archives: Alzheimer’s disease

Cannabis May Cut Alzheimer’s Risk – Discovery News

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“For those who have inhaled, there may be some good news: Marijuana use may cut the risk of developing Alzheimer’s disease by reducing inflammation in the brain…

The findings may explain studies showing those who regularly used marijuana in the 1960s and 1970s are now less likely to develop Alzheimer’s disease than their non-smoking contemporaries.

Under a National Institutes of Health grant, researchers used a synthetic drug similar to marijuana to treat rats with brain inflammation typically associated with Alzheimer’s disease, a form of dementia that afflicts 4.5 million people in the United States alone.”

Read more: http://dsc.discovery.com/news/2006/10/19/marijuana_hea.html

Marijuana Ingredient May Help Alzheimer’s – WebMD

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“Chemical Counters Brain Problems in Alzheimer’s Disease, Says Spanish Study.
New clues about Alzheimer’s disease have emerged from a Spanish study of marijuana. The drug’s active ingredients — cannabinoids — help prevent brain problems seen in Alzheimer’s, say the scientists.

The findings showed that “cannabinoids work both to prevent inflammation and to protect the brain,” says researcher Maria de Ceballos in a news release. That “may set the stage for [cannabinoids’] use as a therapeutic approach for [Alzheimer’s disease].”

The cannabinoids completely prevented activation of cells that trigger inflammation. These cells gather near plaque and are believed to be involved in the development of Alzheimer’s disease.

“Our results indicate that cannabinoid receptors are important in the pathology of Alzheimer’s disease and that cannabinoids succeed in preventing the neurodegenerative process occurring in the disease,” write the researchers in the journal.”

Read more: http://www.webmd.com/alzheimers/news/20050223/marijuana-ingredient-may-help-alzheimers

Marijuana Ingredient May Help Alzheimer’s – FoxNews

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“New clues about Alzheimer’s disease have emerged from a Spanish study of marijuana. The drug’s active ingredients — cannabinoids — help prevent brain problems seen in Alzheimer’s, say the scientists. 

The new study didn’t test cannabinoids on people living with Alzheimer’s disease. Instead, the researchers focused on human brain tissue samples and conducted cannabinoid experiments on rats. 

The findings showed that “cannabinoids work both to prevent inflammation and to protect the brain,” says researcher Maria de Ceballos in a news release. That “may set the stage for [cannabinoids’] use as a therapeutic approach for [Alzheimer’s disease].””

Read more: http://www.foxnews.com/story/0,2933,148518,00.html

Read more: http://www.foxnews.com/story/0,2933,148518,00.html#ixzz2HIrp1uDH

Marijuana May Slow Alzheimer’s Memory Loss

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“New evidence from animal models suggests marijuana may contain compounds that slow the memory loss associated with Alzheimer’s disease. Older rats treated with a synthetic chemical similar to marijuana significantly improved their ability to navigate a maze. Researchers believe the strong anti-inflammatory effects of marijuana slow Alzheimer’s progression.”

marijuanaleaves

“The link between chronic inflammation and the progression of Alzheimer’s is compelling, said Gary Wenk, a study co-author and a professor of psychology at Ohio State University.

“Inflammation in the brain is part of aging,” Wenk said. “It happens to almost all of us as we age. But in some cases, this inflammation gets out of hand and causes serious damage.”

Treatment with a synthetic compound similar to marijuana reduced inflammation in older rats in addition to making the animals “smarter,” said Wenk, who is also a professor of neuroscience and molecular virology, immunology and medical genetics.

“The compound substantially improved the memories of the older rats,” he said. “These animals were able to hold on to key details of a specific task. Untreated older rats, on the other hand, were not.”

The researchers presented their findings at the annual Society for Neuroscience meeting.

Evidence suggests that people who regularly smoked marijuana in the 1960s and 1970s rarely develop Alzheimer’s disease, said Wenk, adding that researchers are eager to develop a drug with the anti-inflammatory properties of marijuana, but without the drug’s psychoactive effects.”

Read more: http://psychcentral.com/news/2006/10/23/marijuana-may-slow-alzheimers-memory-loss/350.html

The therapeutic potential of the endocannabinoid system for Alzheimer’s disease.

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“Based on the complex pathology of AD, a preventative, multimodal drug approach targeting a combination of pathological AD symptoms appears ideal. Importantly, cannabinoids show anti-inflammatory, neuroprotective and antioxidant properties and have immunosuppressive effects. Thus, the cannabinoid system should be a prime target for AD therapy. The cannabinoid receptor 2 appears to be a promising candidate but its role in AD has to be investigated cautiously. Furthermore, the phytocannabinoid cannabidiol is of particular interest as it lacks the psychoactive and cognition-impairing properties of other cannabinoids. In conclusion, future research should focus on the evaluation of the effects of manipulations to the endocannabinoid system in established animal models for AD, combined with early-phase studies in humans.”

http://www.ncbi.nlm.nih.gov/pubmed/22448595

Hope for cannabis-based drug for Alzheimer’s

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“A compound derived from marijuana might one day help fight the memory loss associated with Alzheimer’s disease, a new study suggests.

“Researchers have shown that a synthetic drug similar to cannabis can help older rats perform better on a spatial memory task.

Over a period of three weeks, Gary Wenk at Ohio State University in Columbus, US, and colleagues injected the brains of young and old rats with an inflammatory molecule that created an immune response in the animals’ brains which mimics that seen in Alzheimer’s patients.

During the same period the researchers also injected some of the rats with a synthetic drug similar to cannabis, called WIN-55212-2, which stimulates the brain receptors that normally respond to cannabis compounds.

The rats that received WIN-55212-2 in both age groups found the platform faster than their control counterparts. However, the difference between the treated and untreated animals’ performance was greatest among the older rats. The brains of rats receiving the synthetic drug also showed less sign of inflammation.

The results are impressive particularly because of the low dose of drug used in the experiment, comments Ken Mackie at the University of Washington in Seattle, US, who was not involved in the study.

“They gave them a relatively low dose, even for a rat.” Mackie says that this aspect of the study makes the prospect of developing a similar treatment for humans with Alzheimer’s disease “more promising”.

Wenk cautions, however, that WIN-55212-2 still causes psychoactive effects similar to cannabis, and as such is not yet a candidate for human use. Researchers are currently trying to develop a similar drug that could control inflammation in the brain without a concomitant high.”

Read more: http://www.newscientist.com/article/dn10330-hope-for-cannabisbased-drug-for-alzheimers.html

Scientists are high on idea that marijuana reduces memory impairment

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“The more research they do, the more evidence Ohio State University scientists find that specific elements of marijuana can be good for the aging brain by reducing inflammation there and possibly even stimulating the formation of new brain cells.

The research suggests that the development of a legal drug that contains certain properties similar to those in marijuana might help prevent or delay the onset of Alzheimer’s disease. Though the exact cause of Alzheimer’s remains unknown, chronic inflammation in the brain is believed to contribute to memory impairment.

Any new drug’s properties would resemble those of tetrahydrocannabinol, or THC, the main psychoactive substance in the cannabis plant, but would not share its high-producing effects.

.”Could people smoke marijuana to prevent Alzheimer’s disease if the disease is in their family? We’re not saying that, but it might actually work. What we are saying is it appears that a safe, legal substance that mimics those important properties of marijuana can work on receptors in the brain to prevent memory impairments in aging. So that’s really hopeful,” Wenk said”

Read more: http://phys.org/news146320102.html

Prolonged oral cannabinoid administration prevents neuroinflammation, lowers β-amyloid levels and improves cognitive performance in Tg APP 2576 mice

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“Background

Alzheimer’s disease (AD) brain shows an ongoing inflammatory condition and non-steroidal anti-inflammatories diminish the risk of suffering the neurologic disease. Cannabinoids are neuroprotective and anti-inflammatory agents with therapeutic potential.”

“… we have shown that chronically administered cannabinoid showed marked beneficial effects concomitant with inflammation reduction and increased Aβ clearance.”

“Cannabinoids, whether plant derived, synthetic or endocannabinoids, interact with two well characterized cannabinoid receptors, CB1 and CB2 . In addition, some cannabinoids may interact with other receptors, such as the TRPV1 receptor or the orphan receptor GPR55. The CB1 receptor is widely distributed, with a particularly high expression in brain, which contrasts with the limited expression of the CB2 receptor, which is characteristic of immune organs and cells. In fact, while CB1 receptors are expressed by all types of cells in the brain (neurons and glial cells), CB2 are mainly localized in microglial cells, the resident immune cell of the brain.”

“We and others have proposed cannabinoids as preventive treatment for AD, based on their neuroprotective and anti-inflammatory effects. Indeed, cannabinoids are able to decrease the release of cytokines and nitric oxide in cultured microglial cells induced by lipopolysacharide and Aβ addition. In several in vitro studies cannabidiol (CBD), the major non-psychotropic constituent of cannabis, has shown to be neuroprotective against β-amyloid (Aβ) addition to cultured cells.”

“Conclusions

In summary, cannabinoid agonists, in particular CB2 selective agonists, interfere with several interconnected events of importance in the pathophysiology of AD. These compounds by directly interacting with cannabinoid receptors, in particular CB2, decrease microglial activation thereby reducing inflammation and its consequences (eg cognitive deficits). At the same time they may indirectly have beneficial effects on microglial activation (eg decrease cytokine release) by lowering brain Aβ levels.”

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3292807/

Therapeutic potential of cannabinoid-based drugs.

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Abstract

“Cannabinoid-based drugs modeled on cannabinoids originally isolated from marijuana are now known to significantly impact the functioning of the endocannabinoid system of mammals. This system operates not only in the brain but also in organs and tissues in the periphery including the immune system. Natural and synthetic cannabinoids are tricyclic terpenes, whereas the endogenous physiological ligands are eicosanoids. Several receptors for these compounds have been extensively described, CB1 and CB2, and are G protein-coupled receptors; however, cannabinoid-based drugs are also demonstrated to function independently of these receptors. Cannabinoids regulate many physiological functions and their impact on immunity is generally antiinflammatory as powerful modulators of the cytokine cascade. This anti-inflammatory potency has led to the testing of these drugs in chronic inflammatory laboratory paradigms and even in some human diseases. Psychoactive and nonpsychoactive cannabinoid-based drugs such as Delta9-tetrahydrocannabinol, cannabidiol, HU-211, and ajulemic acid have been tested and found moderately effective in clinical trials of multiple sclerosis, traumatic brain injury, arthritis, and neuropathic pain. Furthermore, although clinical trials are not yet reported, preclinical data with cannabinoid-based drugs suggest efficacy in other inflammatory diseases such as inflammatory bowel disease, Alzheimer’s disease, atherosclerosis, and osteoporosis.”

http://www.ncbi.nlm.nih.gov/pubmed/17713029