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  • Alzheimer Disease/pathology, Animals, Base Sequence, Cannabidiol/pharmacology, Cannabinoids/pharmacology, Cells, Cultured, DNA Primers, Humans, immunohistochemistry, In Vitro Techniques, Messenger/metabolism, Mice, Microglia/drug effects, Nitric Oxide/biosynthesis, Polymerase Chain Reaction, rats, RNA
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Cannabidiol and other cannabinoids reduce microglial activation in vitro and in vivo: relevance to Alzheimer’s disease

Microglial activation is an invariant feature of Alzheimer's disease (AD). It is noteworthy that cannabinoids are neuroprotective by preventing β-amyloid (Aβ)-induced microglial activation both in vitro and in vivo. On the other hand, the phytocannabinoid cannabidiol (CBD) has shown anti-inflammatory properties in different paradigms. In the present study, we compared the effects of CBD with those of other cannabinoids on microglial cell functions in vitro and on learning behavior and cytokine expression after Aβ intraventricular administration to mice. CBD, (R)-(+)-[2,3-dihydro-5-methyl-3-(4-morpholinylmethyl) pyrrolo-[1,2,3-d,e]-1,4-benzoxazin-6-yl]-1-naphthalenyl-methanone [WIN 55,212-2 (WIN)], a mixed CB(1)/CB(2) agonist, and 1,1-dimethylbutyl-1-deoxy-Δ(9)-tetrahydrocannabinol [JWH-133 (JWH)], a CB(2)-selective agonist, concentration-dependently decreased ATP-induced (400 μM) increase in intracellular calcium...
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Cannabidiol as a novel inhibitor of Id-1 gene expression in aggressive breast cancer cells

Invasion and metastasis of aggressive breast cancer cells is the final and fatal step during cancer progression, and is the least understood genetically. Clinically, there are still limited therapeutic interventions for aggressive and metastatic breast cancers available. Clearly, effective and nontoxic therapies are urgently required. Id-1, an inhibitor of basic helix-loop-helix transcription factors, has recently been shown to be a key regulator of the metastatic potential of breast and additional cancers. Using a mouse model, we previously determined that metastatic breast cancer cells became significantly less invasive in vitro and less metastatic in vivo when Id-1 was down-regulated by stable transduction with antisense Id-1....
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Cannabidiol Induces Programmed Cell Death in Breast Cancer Cells by Coordinating the Cross-talk between Apoptosis and Autophagy

Cannabidiol (CBD), a major nonpsychoactive constituent of cannabis, is considered an antineoplastic agent on the basis of its in vitro and in vivo activity against tumor cells. However, the exact molecular mechanism through which CBD mediates this activity is yet to be elucidated. Here, we have shown CBD-induced cell death of breast cancer cells, independent of cannabinoid and vallinoid receptor activation. Electron microscopy revealed morphologies consistent with the coexistence of autophagy and apoptosis. Western blot analysis confirmed these findings. We showed that CBD induces endoplasmic reticulum stress and, subsequently, inhibits AKT and mTOR signaling as shown by decreased levels of phosphorylated mTOR and 4EBP1,...
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Cannabidiol Reduces Aβ-Induced Neuroinflammation and Promotes Hippocampal Neurogenesis through PPARγ Involvement

Peroxisome proliferator-activated receptor-c (PPARc) has been reported to be involved in the etiology of pathological features of Alzheimer’s disease (AD). Cannabidiol (CBD), a Cannabis derivative devoid of psychomimetic effects, has attracted much attention because of its promising neuroprotective properties in rat AD models, even though the mechanism responsible for such actions remains unknown. This study was aimed at exploring whether CBD effects could be subordinate to its activity at PPARc, which has been recently indicated as its putative binding site. CBD actions on bamyloid-induced neurotoxicity in rat AD models, either in presence or absence of PPAR antagonists were investigated. Results showed that the blockade...
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Distinct Effects of 9-Tetrahydrocannabinol and Cannabidiol on Neural Activation During Emotional Processing

CONTEXT: Cannabis use can both increase and reduce anxiety in humans. The neurophysiological substrates of these effects are unknown. OBJECTIVE: To investigate the effects of 2 main psychoactive constituents of Cannabis sativa (Delta9-tetrahydrocannabinol [Delta9-THC] and cannabidiol [CBD]) on regional brain function during emotional processing. DESIGN: Subjects were studied on 3 separate occasions using an event-related functional magnetic resonance imaging paradigm while viewing faces that implicitly elicited different levels of anxiety. Each scanning session was preceded by the ingestion of either 10 mg of Delta9-THC, 600 mg of CBD, or a placebo in a double-blind, randomized, placebo-controlled design. PARTICIPANTS: Fifteen healthy, English-native, right-handed men who...
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Mechanism for inhibitory effect of cannabidiol on microsomal testosterone oxidation in male rat liver.

Effects of four cannabinoids [cannabidiol (CBD), delta 8-tetrahydrocannabinol, delta 9-tetrahydrocannabinol, and cannabinol] on hepatic microsomal oxidation of testosterone (17 beta-hydroxy-androst-4-ene-3-one) were examined in adult male rats. Only CBD (30 microM) competitively inhibited 2 alpha-hydroxy-testosterone (2 alpha-OH-T) and 16 alpha-OH-T formation by hepatic microsomes but did not affect androstenedione (androst-4-ene-3,17-dione) and 7 alpha-OH-T formation. Kinetic analyses demonstrated that the inhibitory profile of CBD for testosterone oxidation was different from those of SKF 525-A, which caused competitive inhibition for 2 alpha- and 16 alpha-hydroxylations and noncompetitive inhibition for 6 alpha-hydroxylation, and of metyrapone, which inhibited only 6 beta-hydroxylation competitively. CBD also suppressed formation of 2 alpha-OH-T,...
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