The structurally diverse phytocannabinoids cannabichromene, cannabigerol and cannabinol significantly inhibit amyloid β-evoked neurotoxicity and changes in cell morphology in PC12 cells

BACKGROUND

Phytocannabinoids (pCBs) have been shown to inhibit the aggregation and neurotoxicity of the neurotoxic Alzheimer's disease protein beta amyloid (Aβ). We characterized the capacity of six pCBs-cannabichromene (CBC), cannabigerol (CBG), cannabinol (CBN), cannabidivarin (CBDV), cannabidiol (CBD) and Δ9 -tetrahydrocannabinol (Δ9 -THC)-to disrupt Aβ aggregation and protect against Aβ-evoked neurotoxicity in PC12 cells.

METHODS

Neuroprotection against lipid peroxidation and Aβ-induced cytotoxicity was assessed using the MTT assay. Transmission electron microscopy was used to visualize pCB effects on Aβ aggregation and fluorescence microscopy, with morphometrics and principal component analysis to assess PC12 cell morphology.

RESULTS

CBD inhibited lipid peroxidation with no significant effect on Aβ toxicity, whilst CBN, CBDV and CBG provided neuroprotection. CBC, CBG and CBN inhibited Aβ1-42 -induced neurotoxicity in PC12 cells, as did Δ9 -THC, CBD and CBDV. CBC, CBN and CBDV inhibited Aβ aggregation, whilst Δ9 -THC reduced aggregate density. Aβ1-42 induced morphological changes in PC12 cells, including a reduction in neuritic projections and rounded cell morphology. CBC and CBG inhibited this effect, whilst Δ9 -THC, CBD and CBDV did not alter Aβ1-42 effects on cell morphology.

CONCLUSIONS

These findings highlight the neuroprotective activity of CBC, CBG and CBN as novel pCBs associated with variable effects on Aβ-evoked neurite damage and inhibition of amyloid β aggregation.

The semi-synthetic flavonoid 2’,3’,4’-trihydroxyflavone (2-D08) inhibits both SN-38- and cytokine-evoked increases in epithelial barrier permeability in an in vitro intestinal mucositis model

The chemotherapeutic drug irinotecan and its active metabolite SN-38 have been linked to the development of off-target gastrointestinal toxicity and inflammation, termed gastrointestinal mucositis (GIM). Flavonoids possess antioxidant and anti-inflammatory...

Cannabis Phytochemicals: A Review of Phytocannabinoid Chemistry and Bioactivity as Neuroprotective Agents

With the advent of medical cannabis usage globally, there has been a renewed interest in exploring the chemical diversity of this unique plant. Cannabis produces hundreds of unique phytocannabinoids, which not only have diverse chemical structures but also a range of cellular and molecular actions, interesting pharmacological properties, and biological actions. In addition, it produces other flavonoids, stilbenoids, and terpenes that have been variably described as conferring additional or so-called entourage effects to whole-plant extracts when used in therapeutic settings. This review explores this phytochemical diversity in relation to specific bioactivity ascribed to phytocannabinoids as neuroprotective agents. It outlines emergent evidence for the potential for selected phytocannabinoids and other cannabis phytochemicals to mitigate factors such as inflammation and oxidative stress as drivers of neurotoxicity, in addition to focusing on specific interactions with pathological misfolding proteins, such as amyloid β, associated with major forms of neurodegenerative diseases such as Alzheimer’s disease.

Relapse prevention in serious mental illness

The current emphasis on relapse prevention in serious mental illness offers psychologists new opportunities and roles for which they are uniquely suited.

Personal accounts of consumer/survivors: insights and implications

The personal accounts of people diagnosed with mental illness have much to teach practitioners. Based on the four articles in this issue, the expanding literature of personal accounts, and the relevant professional literature, some of the salient themes are discussed. Initially, the human context of mental illness is explored, including the diversity among those diagnosed with mental illness and the cataclysmic impact of such a diagnosis on individuals. The recovery process also is examined, including the role of hope, locus of control, coping skills and strategies, and social support and self-help. Finally, the mental health system is considered, including the limitations of the system, patienthood, professional roles and relationships, and psychotherapy. Implications for practitioners are noted.

Human figure drawings of adjudicated and nonadjudicated adolescents

We investigated differences between human figure drawings of adjudicated and nonadjudicated adolescents. In addition, the relationship between human figure drawings and crime category (person, property, other, none) was examined for the adjudicated adolescents. Subjects consisted of four groups of adolescents (n = 25 each): adjudicated males, adjudicated females, nonadjudicated males, and nonadjudicated females. Human figure drawings were obtained from all subjects; they were scored using a system that was developed for use with adolescents. Kruskal-Wallis one-way analyses of variance (ANOVAs) were used to assess the effects of adjudication status and gender. There were 11 significant differences between adjudicated and nonadjudicated adolescents and 11 differences among the four groups. Results of Kruskal-Wallis ANOVAs also showed two significant differences among crime categories.

Psychopathology of opiate addiction: comparative data from the MMPI and MCMI

The MMPI and MCMI were administered to 163 former opiate addicts who were being maintained in a methadone program affiliated with an urban hospital. Highest group mean MMPI scores were found for Psychopathic Deviate, Depression, Hypomania, and Hysteria. For the MCMI, highest group mean clinical syndrome scores were found for Drug Abuse, Alcohol Abuse, Anxiety, and Dysthymia; highest personality disorder scores were found for Antisocial, Narcissistic, Histrionic, and Paranoid. The MCMI Drug Abuse Scale identified only 49% of subjects as having a recurrent or recent history of drug abuse. Frequency and factor analyses documented the heterogeneity of the population with respect to clinical syndromes, as well as the prevalence of personality disorders (86% had elevations on MCMI Personality Scales). Factor and correlational analyses did not provide strong evidence of similar factor structure or convergent validity of the MMPI and MCMI with this population.

Patterns of juvenile criminal activity as a function of demographic, family, and individual variables

Patterns of juvenile criminal activity were investigated with respect to differences in a range of demographic, family, and individual variables. Subjects were 89 juveniles who were referred to a county juvenile services center (70 males, 19 females; 78 Caucasians, 10 Blacks, 1 Oriental; mean age = 15.7). Discriminant function analyses were used to assess the discriminating power of the variables across crime categories (felony vs. misdemeanor), crime subcategories (person vs. property), number of prior referrals (none vs. one or more), and grade level (junior vs. senior high). All groups could be discriminated effectively on the basis of Wilks' lambda and associated chi-square tests of statistical significance.

Candidates and colors: an investigation

A study was undertaken to investigate the effect of color on the perception of politically relevant personality dimensions. Subjects in six college classes were shown political campaign posters printed with the same message in different color combinations. They were then asked to undertake personality ratings of the hypothetical candidate. A multivariate analysis of variance was performed to assess the effect. There were a number of significant findings. Over-all results suggest that color may play an important role within a political context.