The multidrug transporter ABCG2 (BCRP) is inhibited by plant-derived cannabinoids.

“Multiple drug resistance (MDR) is one of the principal causes of chemotherapeutic treatment failure in malignant disease…

Cannabinoids are used therapeutically for the palliation of the adverse side effects associated with cancer chemotherapy. However, cannabinoids also inhibit both the activity and expression of the multidrug transporter…

Cannabinoids are novel Abcg2/ABCG2 inhibitors, reversing the Abcg2-mediated multidrug-resistant phenotype in vitro. This finding may have implications for the co-administration of cannabinoids with pharmaceuticals that are ABCG2 substrates…

Cannabis and cannabinoid preparations are used as therapeutic agents.

One of the many applications of cannabinoids is in the palliation of cancer chemotherapy-induced nausea, vomiting and anorexia. Indeed, the commercial preparations, Marinol and Cesamet, containing the synthetic Δ9-tetrahydrocannabinol (THC) analogue, dronabinol (or nabilone), are approved in some countries for this use.

Interestingly, in the future, cannabinoids might be co-administered with conventional cancer chemotherapies not only in a palliative capacity but also as primary anticancer medications. Accordingly, cannabinoids have demonstrated antiproliferative actions on cancer cells in vitro and in vivo…

To conclude, this is the first study to address the interaction of cannabinoids with the multidrug transporter ABCG2/Abcg2. The results presented here indicate that plant-derived cannabinoids are a novel class of ABCG2/Abcg2 inhibitors. Our results may have important implications for the use of cannabinoid compounds with therapeutic drugs that are substrates for ABCG2.”

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190019/

Role of the endogenous cannabinoid system in nicotine addiction: novel insights.

“Several lines of evidence have shown that the endogenous cannabinoids are implicated in several neuropsychiatric diseases. Notably, preclinical and human clinical studies have shown a pivotal role of the cannabinoid system in nicotine addiction.

The CB1 receptor inverse agonist/antagonist rimonabant (also known as SR141716) was effective to decrease nicotine-taking and nicotine-seeking in rodents, as well as the elevation of dopamine induced by nicotine in brain reward area. Rimonabant has been shown to improve the ability of smokers to quit smoking in randomized clinical trials. However, rimonabant was removed from the market due to increased risk of psychiatric side-effects observed in humans.

Recently, other components of the endogenous cannabinoid system have been explored. Here, we present the recent advances on the understanding of the role of the different components of the cannabinoid system on nicotine’s effects.

Those recent findings suggest possible alternative ways of modulating the cannabinoid system that could have implication for nicotine dependence treatment.”

http://www.ncbi.nlm.nih.gov/pubmed/25859226

http://www.thctotalhealthcare.com/category/addiction/

Cannabinoids receptor type 2, CB2, expression correlates with human colon cancer progression and predicts patient survival.

“Many studies have demonstrated that the endocannabinoid system (ECS) is altered in different tumor types, including colon cancer.

However, little is known about the role of the ECS in tumor progression.

Here we report the correlation between CB 2 expression and pathological data in a series of 175 colorectal cancer patients, as well as the response of the HT29 colon cancer-derived cell line upon CB 2 activation…

These results raise the question whether the activation of CB 2 should be considered as anti-tumoral therapy.”

http://www.ncbi.nlm.nih.gov/pubmed/25859556

http://www.thctotalhealthcare.com/category/colon-cancer/

A sativex-like combination of phytocannabinoids as a disease-modifying therapy in a viral model of multiple sclerosis.

“Sativex® is an oromucosal spray, containing equivalent amounts of Δ9 -tetrahydrocannabinol (Δ9 -THC) and cannabidiol (CBD)-botanical drug substance (BDS), and which has been approved for the treatment of spasticity and pain associated to multiple sclerosis (MS).

In this study, we investigated whether Sativex® may also serve as a disease-modifying agent in the Theiler’s murine encephalomyelitis virus induced demyelinating disease model of MS…

The data support the therapeutic potential of Sativex® to slow MS progression and its relevance in CNS repair.”

http://www.ncbi.nlm.nih.gov/pubmed/25857324

http://www.thctotalhealthcare.com/category/multiple-sclerosis-ms/

 

The cannabis conundrum: Thinking outside the THC box.

“Developing a solid evidence base regarding the health effects of cannabis is imperative given the momentum for legalization and the demand for sound regulatory practices.”

http://www.ncbi.nlm.nih.gov/pubmed/25855064

http://www.thctotalhealthcare.com/

Role of Cannabinoid Receptor CB2 in HER2 Pro-oncogenic Signaling in Breast Cancer.

“Pharmacological activation of cannabinoid receptors elicits antitumoral responses in different cancer models. However, the biological role of these receptors in tumor physio-pathology is still unknown…

Our findings reveal an unprecedented role of CB2 as a pivotal regulator of HER2 pro-oncogenic signaling in breast cancer, and they suggest that CB2 may be a biomarker with prognostic value in these tumors.”

[Protective effect of paeoniflorin on the hippocampus in rats with cerebral ischemia-reperfusion through activating cannabinoid receptor 2].

Objective:

To investigate the protective effect of paeoniflorin on hippocampal neurons in rats subjected to cerebral ischemia and reperfusion through activating cannabinoid receptor 2 (CBR2).

Conclusion:

CBR2 may participate in the protective effect of paeoniflorin on hippocampal neurons of cerebral ischemia-reperfusion rat models.”

http://www.ncbi.nlm.nih.gov/pubmed/25854559

http://www.ncbi.nlm.nih.gov/pubmed/?term=Paeoniflorin

http://www.ncbi.nlm.nih.gov/pubmed/?term=Paeonia+lactiflora

http://en.wikipedia.org/wiki/Paeonia_lactiflora

 

 

Parental reporting of response to oral cannabis extracts for treatment of refractory epilepsy.

“Oral cannabis extracts (OCEs) have been used in the treatment of epilepsy; however, no studies demonstrate clear efficacy. We report on a cohort of pediatric patients with epilepsy who were given OCE and followed in a single tertiary epilepsy center…

Seventy-five patients were identified of which 57% reported any improvement in seizure control and 33% reported a >50% reduction in seizures (responders).

Our retrospective study of OCE use in pediatric patients with epilepsy demonstrates that some families reported patient improvement with treatment;

We strongly support the need for controlled, blinded studies to evaluate the efficacy and safety of OCE for treatment of pediatric epilepsies using accurate seizure counts, formal neurocognitive assessments, as well as EEG as a biomarker.

This study provides Class III evidence that OCE is well tolerated by children and adolescents with epilepsy.”

http://www.ncbi.nlm.nih.gov/pubmed/25845492

http://www.thctotalhealthcare.com/category/epilepsy-2/

 

Activation of Cannabinoid CB2 receptors Reduces Hyperalgesia in an Experimental Autoimmune Encephalomyelitis Mouse Model of Multiple Sclerosis.

“Clinical trials investigating the analgesic efficacy of cannabinoids in multiple sclerosis have yielded mixed results, possibly due to psychotropic side effects mediated by cannabinoid CB1 receptors. We hypothesized that a CB2-specific agonist (JWH-133) would decrease hyperalgesia in an experimental autoimmune encephalomyelitis mouse model of multiple sclerosis…

Our results suggest that JWH-133 acts at CB2 receptors, most likely within the dorsal horn of the spinal cord, to suppress the hypersensitivity associated with experimental autoimmune encephalomyelitis.

These are the first pre-clinical studies to directly promote CB2 as a promising target for the treatment of central pain in an animal model of multiple sclerosis.”

http://www.ncbi.nlm.nih.gov/pubmed/25849525

The role of the endocannabinoid system in pain.

“Preparations of the Cannabis sativa plant have been used to analgesic effect for millenia, but only in recent decades has the endogenous system responsible for these effects been described.

The endocannabinoid (EC) system is now known to be one of the key endogenous systems regulating pain sensation, with modulatory actions at all stages of pain processing pathways.

The EC system is composed of two main cannabinoid receptors (CB1 and CB2) and two main classes of endogenous ligands or endocannabinoids (ECs).

The receptors have distinct expression profiles, with CB1 receptors found at presynaptic sites throughout the peripheral and central nervous systems (PNS and CNS, respectively), whilst CB2 receptor is found principally (but not exclusively) on immune cells.

The endocannabinoid ligands are lipid neurotransmitters belonging to either the N-acyl ethanolamine (NAEs) class, e.g. anandamide (AEA), or the monoacylglycerol class, e.g. 2-arachidonoyl glycerol (2-AG).

Both classes are short-acting transmitter substances, being synthesised on demand and with signalling rapidly terminated by specific enzymes. ECs acting at CB1 negatively regulate neurotransmission throughout the nervous system, whilst those acting at CB2 regulate the activity of CNS immune cells.

Signalling through both of these receptor subtypes has a role in normal nociceptive processing and also in the development resolution of acute pain states.

In this chapter, we describe the general features of the EC system as related to pain and nociception and discuss the wealth of preclinical and clinical data involving targeting the EC system with focus on two areas of particular promise: modulation of 2-AG signalling via specific enzyme inhibitors and the role of spinal CB2 in chronic pain states.”

http://www.ncbi.nlm.nih.gov/pubmed/25846617

http://www.thctotalhealthcare.com/category/pain-2/