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Alzheimer's Disease
#1
Can marijuana help treat Alzheimer's disease?

General Reference (not clearly pro or con)



The National Institute on Aging stated in its Mar. 2006 booklet Understanding Alzheimer's Disease: "Alzheimer's disease is an illness of the brain. It causes large numbers of nerve cells in the brain to die. This affects your ability to remember things and think clearly. Doctors don't know what causes the disease. They do know that it usually begins after age 60 and nearly half of people age 85 and older may have Alzheimer's. However, it is not a normal part of aging...



There are medicines that can treat the symptoms of Alzheimer's. However, there is no cure. Some medicines keep your memory loss and other symptoms from getting worse for a time. These medicines work best if Alzheimer's disease is found early. Other medicines work to help you sleep better or feel less worried and depressed. These medicines don't directly treat the disease. They do help you feel more comfortable."





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Stimulation of cannabinoid receptor 2 (CB<sub>2</sub>) suppresses microglial activation





Background

Activated microglial cells have been implicated in a number of neurodegenerative disorders, including Alzheimer's disease (AD), multiple sclerosis (MS), and HIV dementia. It is well known that inflammatory mediators such as nitric oxide (NO), cytokines, and chemokines play an important role in microglial cell-associated neuron cell damage. Our previous studies have shown that CD40 signaling is involved in pathological activation of microglial cells. Many data reveal that cannabinoids mediate suppression of inflammation in vitro and in vivo through stimulation of cannabinoid receptor 2 (CB<sub>2</sub>).





Methods

In this study, we investigated the effects of a cannabinoid agonist on CD40 exp<b></b>ression and function by cultured microglial cells activated by IFN- using RT-PCR, Western immunoblotting, flow cytometry, and anti-CB<sub>2 </sub>small interfering RNA (siRNA) analyses. Furthermore, we examined if the stimulation of CB<sub>2 </sub>could modulate the capacity of microglial cells to phagocytise Ab<sub>142 </sub>peptide using a phagocytosis assay.





Results

We found that the selective stimulation of cannabinoid receptor CB<sub>2 </sub>by JWH-015 suppressed IFN--induced CD40 exp<b></b>ression. In addition, this CB<sub>2 </sub>agonist markedly inhibited IFN--induced phosphorylation of JAK/STAT1. Further, this stimulation was also able to suppress microglial TNF-a and nitric oxide production induced either by IFN- or Ab peptide challenge in the presence of CD40 ligation. Finally, we showed that CB<sub>2 </sub>activation by JWH-015 markedly attenuated CD40-mediated inhibition of microglial phagocytosis of Ab<sub>142 </sub>peptide. Taken together, these results provide mechanistic insight into beneficial effects provided by cannabinoid receptor CB<sub>2 </sub>modulation in neurodegenerative diseases, particularly AD.





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List of abbreviations

Ab : Amyloid-b peptide



CD40: CD40 receptor



CD40L: CD40 ligand



CNS: Central nervous system



HIV: Human immunodeficiency virus



IFN- : Interferon-gamma



JAK: Janus kinase



MHC II: Major histocompatibility complex II



STAT1: Signal transducer and activator of transcription 1



TNF-a : Tumor necrosis factor-alpha









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Reply


Messages In This Thread
Alzheimer's Disease - by EDDIEKIRK - 04-16-2012, 10:08 PM
Alzheimer's Disease - by EDDIEKIRK - 05-06-2012, 01:18 PM
Alzheimer's Disease - by eloquentsolution - 05-06-2012, 05:45 PM
Alzheimer's Disease - by EDDIEKIRK - 05-06-2012, 09:39 PM
Alzheimer's Disease - by Lady Strider - 05-06-2012, 10:44 PM
Alzheimer's Disease - by eloquentsolution - 05-06-2012, 10:53 PM
Alzheimer's Disease - by EDDIEKIRK - 05-14-2012, 04:28 PM
Alzheimer's Disease - by EDDIEKIRK - 05-14-2012, 10:07 PM
Alzheimer's Disease - by EDDIEKIRK - 05-21-2012, 02:20 PM
Alzheimer's Disease - by EDDIEKIRK - 07-07-2012, 07:54 PM



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