Author Archives: David Worrell

Does cannabis use modify the effect of post-traumatic stress disorder on severe depression and suicidal ideation? Evidence from a population-based cross-sectional study of Canadians

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Image result for journal of psychopharmacology“Post-traumatic stress disorder sharply increases the risk of depression and suicide. Individuals living with post-traumatic stress disorder frequently use cannabis to treat associated symptoms.

We sought to investigate whether cannabis use modifies the association between post-traumatic stress disorder and experiencing a major depressive episode or suicidal ideation.

Among 24,089 eligible respondents, 420 (1.7%) reported a current clinical diagnosis of post-traumatic stress disorder. In total, 106 (28.2%) people with post-traumatic stress disorder reported past-year cannabis use, compared to 11.2% of those without post-traumatic stress disorder (p < 0.001). In multivariable analyses, post-traumatic stress disorder was significantly associated with recent major depressive episode (adjusted odds ratio = 7.18, 95% confidence interval: 4.32–11.91) and suicidal ideation (adjusted odds ratio = 4.76, 95% confidence interval: 2.39–9.47) among cannabis non-users. post-traumatic stress disorder was not associated with either outcome among cannabis-using respondents (both p > 0.05).

This study provides preliminary epidemiological evidence that cannabis use may contribute to reducing the association between post-traumatic stress disorder and severe depressive and suicidal states. There is an emerging need for high-quality experimental investigation of the efficacy of cannabis/cannabinoids for the treatment of post-traumatic stress disorder.”

https://www.ncbi.nlm.nih.gov/pubmed/31684805

https://journals.sagepub.com/doi/10.1177/0269881119882806

“Cannabis could help alleviate depression and suicidality among people with PTSD” https://medicalxpress.com/news/2019-11-cannabis-alleviate-depression-suicidality-people.html

Anticancer effects of n-3 EPA and DHA and their endocannabinoid derivatives on breast cancer cell growth and invasion.

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Prostaglandins, Leukotrienes and Essential Fatty Acids Home“The anticancer effects of the omega-3 long chain polyunsaturated fatty acids (LCPUFA), EPA and DHA may be due, at least in part, to conversion to their respective endocannabinoid derivatives, eicosapentaenoyl-ethanolamine (EPEA) and docosahexaenoyl-ethanolamine (DHEA).

Here, the effects of EPEA and DHEA and their parent compounds, EPA and DHA, on breast cancer (BC) cell function was examined. EPEA and DHEA exhibited greater anti-cancer effects than EPA and DHA in two BC cells (MCF-7 and MDA-MB-231) whilst displaying no effect in non-malignant breast cells (MCF-10a).

Both BC lines expressed CB1/2 receptors that were responsible, at least partly, for the observed anti-proliferative effects of the omega-3 endocannabinoids as determined by receptor antagonism studies. Additionally, major signalling mechanisms elicited by these CB ligands included altered phosphorylation of p38-MAPK, JNK, and ERK proteins.

Both LCPUFAs and their endocannabinoids attenuated the expression of signal proteins in BC cells, albeit to different extents depending on cell type and lipid effectors. These signal proteins are implicated in apoptosis and attenuation of BC cell migration and invasiveness.

Furthermore, only DHA reduced in vitro MDA-MB-231 migration whereas both LCPUFAs and their endocannabinoids significantly inhibited invasiveness. This finding was consistent with reduced integrin β3 expression observed with all treatments and reduced MMP-1 and VEGF with DHA treatment.

Attenuation of cell viability, migration and invasion of malignant cells indicates a potential adjunct nutritional therapeutic use of these LCPUFAs and/or their endocannabinoids in treatment of breast cancer.”

https://www.ncbi.nlm.nih.gov/pubmed/31679810

https://www.plefa.com/article/S0952-3278(19)30112-7/fulltext

Targeting the cannabinoid receptor CB2 in a mouse model of l-dopa induced dyskinesia.

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Neurobiology of Disease“L-dopa induced dyskinesia (LID) is a debilitating side-effect of the primary treatment used in Parkinson’s disease (PD), l-dopa. Here we investigate the effect of HU-308, a cannabinoid CB2 receptor agonist, on LIDs.

Utilizing a mouse model of PD and LIDs, induced by 6-OHDA and subsequent l-dopa treatment, we show that HU-308 reduced LIDs as effectively as amantadine, the current frontline treatment. Furthermore, treatment with HU-308 plus amantadine resulted in a greater anti-dyskinetic effect than maximally achieved with HU-308 alone, potentially suggesting a synergistic effect of these two treatments. Lastly, we demonstrated that treatment with HU-308 and amantadine either alone, or in combination, decreased striatal neuroinflammation, a mechanism which has been suggested to contribute to LIDs.

Taken together, our results suggest pharmacological treatments with CB2 agonists merit further investigation as therapies for LIDs in PD patients. Furthermore, since CB2 receptors are thought to be primarily expressed on, and signal through, glia, our data provide weight to suggestion that neuroinflammation, or more specifically, altered glial function, plays a role in development of LIDs.”

https://www.ncbi.nlm.nih.gov/pubmed/31669673

“Collectively, our findings suggest CB2 agonists offer a putative target to treat LIDs, with efficacy comparable to the frontline treatment amantadine. Our study suggests that targeting glial function may be an important strategy for developing therapies for treating LIDs, a major unmet need for PD patients.”

https://www.sciencedirect.com/science/article/pii/S0969996119303213?via%3Dihub

Cannabidiol Regulates Gene Expression in Encephalitogenic T cells Using Histone Methylation and noncoding RNA during Experimental Autoimmune Encephalomyelitis.

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 Scientific Reports“Cannabidiol (CBD) has been shown by our laboratory to attenuate experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis (MS).

In this study, we used microarray and next generation sequencing (NGS)-based approaches to determine whether CBD would alter genome-wide histone modification and gene expression in MOG sensitized lymphocytes.

In summary, this study demonstrates that CBD suppresses inflammation through multiple mechanisms, from histone methylation to miRNA to lncRNA.”

https://www.ncbi.nlm.nih.gov/pubmed/31673072

“Marijuana (Cannabis sativa) has many biologically active compounds and its medicinal value has been known for centuries. CBD has been shown to have an anti-inflammatory effect in several animal models. In immune system, studies from our lab as well as those from others have shown that both THC and CBD have anti-inflammatory properties. ”

https://www.nature.com/articles/s41598-019-52362-8

Ameliorative effects of hempseed (Cannabis sativa) against hypercholesterolemia associated cardiovascular changes.

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Nutrition, Metabolism and Cardiovascular Diseases“Hypercholesterolemia (HC) is a major risk factor for cardiovascular (CV) diseases, that are the major cause of mortality worldwide.

Free radicals mediated oxidative stress is a critical player in HC-associated pathophysiological insults including atherosclerosis. Unwanted side effects associated with statins, COX-2 inhibitors, and other synthetic drugs limit their use. Thus, modulation of oxidative stress during HC using green pharmaceuticals seems an appropriate approach against deleterious CV consequences without noticeable side-effect.

In this regard, owing to an abundance of proteins, fiber and optimal ratios of omega 6 PUFA: omega-3 PUFA in Hempseed (HS), we aim to exploit its anti-inflammatory and antioxidant properties to ameliorate HC- associated CV effects.

CONCLUSIONS:

Current study evidently demonstrates that the anti-hypercholesterolemic effects of HS are mediated through redox-sensitive modulation of inflammatory pathways.”

https://www.ncbi.nlm.nih.gov/pubmed/31668458

“Hypercholesterolemia (HC) associated oxidative stress is central to cardiovascular (CV) diseases. Unwanted side effects associated with statins and other synthetic drugs limits their use. Modulation of HC associated oxidative stress by Hempseed (HS) was based on its anti-inflammatory/antioxidant properties. HS exhibited intense anti-inflammatory and anti-atherosclerotic effect via redox modulation of PG biosynthetic pathway. The multipronged approach to characterize HC associated CV effects and its modulation by HS is novel.”

https://www.nmcd-journal.com/article/S0939-4753(19)30345-X/fulltext

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Prevalence and predictors of cannabis use among men receiving androgen-deprivation therapy for advanced prostate cancer.

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 “Prostate cancer patients receiving androgen-deprivation therapy (ADT) often experience a combination of disease symptoms and treatment side effects. The therapeutic use of cannabis to alleviate these side effects has not been studied, despite increasing patient interest. With the increasing availability of cannabis, it is important for clinicians to understand the prevalence, predictors, and perceived benefits of cannabis use among patients with prostate cancer.

RESULTS:

Questionnaire data revealed that 23.2% of surveyed men had recently used cannabis. In contrast, 5.8% of men had detectable levels of THC metabolite in their urine. Combined questionnaire and urine data revealed that cannabis users were significantly younger (p=0.003) and had lower testosterone levels (p=0.003) than non-users. The majority of men experiencing common ADT side effects reported some degree of relief following cannabis use.

CONCLUSIONS:

Cannabis use among men with advanced prostate cancer receiving ADT is more prevalent than in the general population and the majority of other oncological cohorts. Lower testosterone levels and reported therapeutic benefit among cannabis users warrants confirmation in appropriate clinical trials.”

https://www.ncbi.nlm.nih.gov/pubmed/31658007

https://cuaj.ca/index.php/journal/article/view/5911

Endocannabinoid System Alterations in Posttraumatic Stress Disorder: A Review of Developmental and Accumulative Effects of Trauma.

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 Image result for sage journals chronic stress“The role of the endocannabinoid system in stress-related psychiatric symptoms has been investigated in many animal and human studies.

Although most of these studies consistently report long-lasting effects of prolonged stress and trauma on the endocannabinoid system, the nature and direction of these changes are controversial.

We reviewed the available preclinical and clinical studies investigating the endocannabinoid system alterations long after chronic stress and trauma.

We propose that the effects of prolonged stress or trauma on the endocannabinoid system are different based on the developmental age of subjects at the time of experiencing the trauma and its repetitiveness and accumulative effects.

The current literature consistently demonstrates decreased levels of endocannabinoid ligands and receptors if the trauma occurs in childhood, whereas decreased levels of endocannabinoid ligands and increased levels of cannabinoid receptors are reported when trauma has happened in adulthood.

It is important to note that these changes are region-specific in the brain and also there are important sex differences, which are beyond the scope of this review.”

https://www.ncbi.nlm.nih.gov/pubmed/31660473

“More studies are needed to compare the effects of childhood and adulthood trauma, with or without PTSD presentations, on the eCB system. These studies would have important clinical implications, not only for individuals with trauma and PTSD who commonly have comorbid recreational cannabis use, and medical marijuana users with PTSD being one of its main indicators but also for studies investigating the potential therapeutic use of cannabinoids and eCB enhancers in PTSD treatment.”

https://journals.sagepub.com/doi/10.1177/2470547019864096

Structure of an allosteric modulator bound to the CB1 cannabinoid receptor.

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Image result for nature chemical biology“The CB1 receptor mediates the central nervous system response to cannabinoids, and is a drug target for pain, anxiety and seizures.

CB1 also responds to allosteric modulators, which influence cannabinoid binding and efficacy.

To understand the mechanism of these compounds, we solved the crystal structure of CB1 with the negative allosteric modulator (NAM) ORG27569 and the agonist CP55940.

The structure reveals that the NAM binds to an extrahelical site within the inner leaflet of the membrane, which overlaps with a conserved site of cholesterol interaction in many G protein-coupled receptors (GPCRs).

The ternary structure with ORG27569 and CP55940 captures an intermediate state of the receptor, in which aromatic residues at the base of the agonist-binding pocket adopt an inactive conformation despite the large contraction of the orthosteric pocket.

The structure illustrates a potential strategy for drug modulation of CB1 and other class A GPCRs.”

https://www.ncbi.nlm.nih.gov/pubmed/31659318

https://www.nature.com/articles/s41589-019-0387-2

Cannabinoid receptor 2‑selective agonist JWH015 attenuates bone cancer pain through the amelioration of impaired autophagy flux induced by inflammatory mediators in the spinal cord.

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Journal Cover “Bone cancer pain (BCP) is a severe complication of advanced bone cancer.

Although cannabinoid receptor 2 (CB2) agonists may have an analgesic effect, the underlying mechanism remains unclear.

CB2 serves a protective role in various pathological states through the activation of autophagy. Therefore, the present study aimed to determine whether the analgesic effects of the selective CB2 agonist JWH015 was mediated by the activation of autophagy in BCP.

The results of the present study suggested that the impairment of autophagy flux was induced by glia‑derived inflammatory mediators in spinal neurons. Intrathecal administration of the selective CB2 agonist JWH015 ameliorated autophagy flux through the downregulation of IL‑1β and IL‑6 and attenuated BCP.”

https://www.ncbi.nlm.nih.gov/pubmed/31661120

https://www.spandidos-publications.com/10.3892/mmr.2019.10772

Antibacterial properties of hemp hurd powder against E. coli

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Publication cover image“Hemp (Cannabis sativa L.) is an eco‐friendly and multifunctional plant. Hemp hurd is a by‐product of hemp plant during hemp fiber separation. Although hemp hurd is repeatedly announced owing antibacterial activity, it has never been systematically investigated and reported. In this study, the antibacterial activity of hemp hurd powder against Escherichia coli is investigated. This article reveals antibacterial activity of hemp hurd where hemp hurd powder inhibits the growth of E. coli. Meanwhile, the self‐contamination (forming during retting process) inside hemp hurd has dramatic impact on the antibacterial performance. To achieve better antibacterial activity, hemp hurd was heat treated to eliminate self‐contaminations. The impact of the particle sizes and heat treatment on the antibacterial effectiveness was evaluated.”

https://onlinelibrary.wiley.com/doi/abs/10.1002/app.41588

https://www.researchgate.net/publication/267628173_Antibacterial_Properties_of_Hemp_Hurd_Powder_Against_E_coli