Pharmacological benefits of selective modulation of cannabinoid receptor type 2 (CB2) in experimental Alzheimer’s disease.

“Alzheimer’s disease (AD) is a progressive neurodegenerative disorder that pervasively affects the population across the world.

Currently, there is no effective treatment available for this and existing drugs merely slow the progression of cognitive function decline. Thus, massive effort is required to find an intended therapeutic target to overcome this condition.

The present study has been framed to investigate the ameliorative role of selective modulator of cannabinoid receptor type 2 (CB2), 1-phenylisatin in experimental AD condition…

Hence, this study concludes that CB2 receptor modulation can be a potential therapeutic target for the management of AD.”

http://www.ncbi.nlm.nih.gov/pubmed/26577751

Potential Therapeutical Contributions of the Endocannabinoid System towards Aging and Alzheimer’s Disease.

“Aging can lead to decline in cognition, notably due to neurodegenerative processes overwhelming the brain over time.

As people live longer, numerous concerns are rightfully raised toward long-term slowly incapacitating diseases with no cure, such as Alzheimer’s disease.

Since the early 2000’s, the role of neuroinflammation has been scrutinized for its potential role in the development of diverse neurodegenerative diseases notably because of its slow onset and chronic nature in aging.

Despite the lack of success yet, treatment of chronic neuroinflammation could help alleviate process implicated in neurodegenerative disease.

A growing number of studies including our own have aimed at the endocannabinoid system and unfolded unique effects of this system on neuroinflammation, neurogenesis and hallmarks of Alzheimer’s disease and made it a reasonable target in the context of normal and pathological brain aging.”

http://www.ncbi.nlm.nih.gov/pubmed/26425394

Endocannabinoids and Neurodegenerative Disorders: Parkinson’s Disease, Huntington’s Chorea, Alzheimer’s Disease, and Others.

“This review focuses on the role of the endocannabinoid signaling system in controlling neuronal survival, an extremely important issue to be considered when developing new therapies for neurodegenerative disorders.

First, we will describe the cellular and molecular mechanisms, and the signaling pathways, underlying these neuroprotective properties, including the control of glutamate homeostasis, calcium influx, the toxicity of reactive oxygen species, glial activation and other inflammatory events; and the induction of autophagy.

We will then concentrate on the preclinical studies and the few clinical trials that have been carried out targeting endocannabinoid signaling in three important chronic progressive neurodegenerative disorders (Parkinson’s disease, Huntington’s chorea, and Alzheimer’s disease), as well as in other less well-studied disorders.

We will end by offering some ideas and proposals for future research that should be carried out to optimize endocannabinoid-based treatments for these disorders.

Such studies will strengthen the possibility that these therapies will be investigated in the clinical scenario and licensed for their use in specific disorders.”

Endocannabinoid regulation of amyloid-induced neuroinflammation.

“The modulation of endocannabinoid (EC) levels and the activation of cannabinoid receptors are seen as promising therapeutic strategies in a variety of diseases, including Alzheimer’s disease (AD).

These data reinforce the notion of a role for the EC system in neuroinflammation and open new perspectives on the relevance of modulating EC levels in the inflammed brain.”

http://www.ncbi.nlm.nih.gov/pubmed/26362942

Age-related changes in the endocannabinoid system in the mouse hippocampus.

“Previous studies have demonstrated that the endocannabinoid system significantly influences the progression of brain ageing, and the hippocampus is one of the brain regions most vulnerable to ageing and neurodegeneration.

We have further examined age-related changes in the hippocampalendocannabinoid system by measuring the levels of anandamide (AEA) and 2-arachidonoylglycerol (2-AG) in young and old mice from two different mouse strains.

We found a decrease in 2-AG but not AEA levels in aged mice.

In order to identify the cause for 2-AG level changes, we investigated the levels of several enzymes that contribute to synthesis and degradation of 2-AG in the hippocampus.

We found a selective decrease in DAGLα mRNA and protein levels as well as an elevated MAGL activity during ageing.

We hypothesize that the observed decrease of 2-AG levels is probably caused by changes in DAGLα expression and MAGL activity.

This finding can contribute to the existing knowledge about the processes underlying selective vulnerability of the hippocampus to ageing and age-related neurodegeneration.”

http://www.ncbi.nlm.nih.gov/pubmed/26278494

Cannabinoids for the Treatment of Agitation and Aggression in Alzheimer’s Disease.

“Alzheimer’s disease (AD) is frequently associated with neuropsychiatric symptoms (NPS) such as agitation and aggression, especially in the moderate to severe stages of the illness. The limited efficacy and high-risk profiles of current pharmacotherapies for the management of agitation and aggression in AD have driven the search for safer pharmacological alternatives.

Over the past few years, there has been a growing interest in the therapeutic potential of medications that target the endocannabinoid system (ECS).

The behavioural effects of ECS medications, as well as their ability to modulate neuroinflammation and oxidative stress, make targeting this system potentially relevant in AD.

This article summarizes the literature to date supporting this rationale and evaluates clinical studies investigating cannabinoids for agitation and aggression in AD.

Letters, case studies, and controlled trials from four electronic databases were included. While findings from six studies showed significant benefits from synthetic cannabinoids-dronabinol or nabilone-on agitation and aggression, definitive conclusions were limited by small sample sizes, short trial duration, and lack of placebo control in some of these studies.

Given the relevance and findings to date, methodologically rigorous prospective clinical trials are recommended to determine the safety and efficacy of cannabinoids for the treatment of agitation and aggression in dementia and AD.”

Cannabinoids in Neurodegenerative Disorders and Stroke/Brain Trauma: From Preclinical Models to Clinical Applications.

“Cannabinoids form a singular family of plant-derived compounds (phytocannabinoids), endogenous signaling lipids (endocannabinoids), and synthetic derivatives with multiple biological effects and therapeutic applications in the central and peripheral nervous systems.

One of these properties is the regulation of neuronal homeostasis and survival, which is the result of the combination of a myriad of effects addressed to preserve, rescue, repair, and/or replace neurons, and also glial cells against multiple insults that may potentially damage these cells.

These effects are facilitated by the location of specific targets for the action of these compounds (e.g., cannabinoid type 1 and 2 receptors, endocannabinoid inactivating enzymes, and nonendocannabinoid targets) in key cellular substrates (e.g., neurons, glial cells, and neural progenitor cells).

This potential is promising for acute and chronic neurodegenerative pathological conditions. In this review, we will collect all experimental evidence, mainly obtained at the preclinical level, supporting that different cannabinoid compounds may be neuroprotective in adult and neonatal ischemia, brain trauma, Alzheimer’s disease, Parkinson’s disease, Huntington’s chorea, and amyotrophic lateral sclerosis.

This increasing experimental evidence demands a prompt clinical validation of cannabinoid-based medicines for the treatment of all these disorders, which, at present, lack efficacious treatments for delaying/arresting disease progression…”

http://www.ncbi.nlm.nih.gov/pubmed/26260390

Endocannabinoid 2-arachidonylglycerol protects primary cultured neurons against LPS-induced impairments in rat caudate nucleus.

“Inflammation plays a pivotal role in the pathogenesis of many diseases in the central nervous system.

Caudate nucleus (CN), the largest nucleus in the brain, is also implicated in many neurological disorders.

2-Arachidonoylglycerol (2-AG), the most abundant endogenous cannabinoid and the true natural ligand for CB1 receptors, has been shown to exhibit neuroprotective effects through its anti-inflammatory action from proinflammatory stimuli in hippocampus.

In the present study, we discovered that 2-AG significantly protects CN neurons in culture against lipopolysaccharide (LPS)-induced inflammatory response.

Our study suggests the therapeutic potential of 2-AG for the treatment of some inflammation-induced neurological disorders and pain.”

http://www.ncbi.nlm.nih.gov/pubmed/24510751

Endocannabinoid 2-arachidonylglycerol protects primary cultured neurons against homocysteine-induced impairments in rat caudate nucleus through CB1 receptor.

“Homocysteine (Hcy) is a high risk factor for Alzheimer’s disease (AD). Caudate nucleus (CN), the major component of basal ganglia in the brain, is also involved in many neurological disorders.

2-Arachidonoylglycerol (2-AG), the true natural ligand for cannabinoid type-1 (CB1) receptors and the most abundant endogenous cannabinoid, has been shown to exhibit neuroprotective effects through its anti-inflammatory action from proinflammatory stimuli in the hippocampus and CN.

In the present work, we explored that 2-AG significantly protects CN neurons in culture against Hcy-induced response.

2-AG is capable of inhibiting elevation of Hcy-induced cyclooxygenase-2 expression associated with nuclear factor-kappaB/p38MAPK/ERK1/2 signaling pathway through CB1 receptors-dependent way in primary cultured CN neurons.

Our study reveals the therapeutic potential for 2-AG for the treatment of neurodegenerative diseases, such as AD.”

http://www.ncbi.nlm.nih.gov/pubmed/25007951

Effect of Homocysteine on Voltage-Gated Sodium Channel Currents in Primary Cultured Rat Caudate Nucleus Neurons and Its Modulation by 2-Arachidonylglycerol.

“Homocysteine (Hcy) is an important risk factor for Alzheimer’s disease (AD) and other neurodegenerative diseases. Caudate nucleus (CN), the largest nucleus in the brain, is also implicated in many neurological disorders.

2-Arachidonoylglycerol (2-AG), the most abundant endogenous cannabinoid, has been shown to exhibit neuroprotective effects from many stimuli in the central nervous system (CNS).

Furthermore, it has been reported that voltage-gated sodium channels (VGSCs) are the common targets of many neuronal damages and drugs.

However, it is still not clear whether VGSCs are involved in the neurotoxicity of Hcy and the neuroprotective effect of 2-AG in CN neurons. In the present study, whole-cell patch clamp recording was used to invest the action of Hcy on sodium currents in primary cultured rat CN neurons and its modulation by 2-AG.

The results showed that in cultured CN neurons, pathological concentration of Hcy (100 μM) significantly increased the voltage-gated sodium currents (I Na) and produced a hyperpolarizing shift in the activation-voltage curve of I Na.

The further data demonstrated 2-AG is capable of suppressing elevation of Hcy-induced increase in I Na and hyperpolarizing shift of activation curves most partly through CB1 receptor-dependent way.

Our study provides a better understanding of Hcy-associated neurological disorders and suggests the therapeutic potential for 2-AG for the treatment of these diseases.”

http://www.ncbi.nlm.nih.gov/pubmed/26179279