CBD efficacy on nonmotor symptoms of Parkinson Disease anxiety & psychosis


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This is the last section of a review article Managing Psychosis in Parkinson Disease

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Results from preclinical and preliminary studies also suggest that cannabidiol (CBD) has therapeutic potential for nonmotor symptoms of PD.14 The multifaceted mechanism of action as an agonist of 5-HT1A, partial agonist of CB1 and CB2 receptors, and antagonist of the G-protein–coupled receptor GPR55 reverses the iron-induced epigenetic modification of mitochondrial DNA and the reduction of succinate dehydrogenase activity and decreases the levels of the pro-inflammatory cytokines IL-1β, TNF-α, IFN-β, IFN-γ, IL-17, and IL-6—all of which decrease pro-inflammatory mediators resulting in neuroprotective, anxiolytic, and antipsychotic effects.14

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“Several in vitro experiments have demonstrated promising neuro- protective effects of CBD in PD models. In one of these models, using PC12 and SH-SY5Y cells treated with MPP+ [1-methyl-4-phenylpyridinium], CBD increased cell viability, differentiation, and the expression of axonal [GAP-43] and synaptic [synaptophysin and synapsin I] proteins,” Ferreria-Junior and colleagues wrote,15 while acknowledging the paucity of studies that have addressed the biological bases for the purported effects of CBD on PD. “Double-blind, placebo-controlled, randomized trials with larger samples of patients with PD are needed to elucidate the possible effectiveness and mechanisms involved in the therapeutic potential of CBD in this movement disorder. This will also include the putative effects of CBD in preventing L-dopa–induced severe [adverse] effects and preventing PD progression.”

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The endocannabinoid system serves as an important filter of excitatory, inhibitory, and modulatory inputs that act at the midbrain and terminal regions to orchestrate DA neurotransmission by controlling DA cell body firing patterns, terminal release, and effects on postsynaptic sites in the striatum.16 Beneficial effects of CBD administration have been observed prior to or immediately after induction of PD-like symptoms in animal studies, which may suggest a preventive role rather than a therapeutic one.14 In an early open-label pilot study to evaluate the efficacy of CBD on nonmotor symptoms of PD in 6 patients with PDP, psychotic symptoms significantly decreased under CBD treatment, as evaluated by the brief psychiatric rating scale and the Parkinson psychosis questionnaire.17

 

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Psychiatric comorbidities prevalent in the majority of patients with PD are associated with more disease severity, impaired QOL, and increased use of healthcare resources, with longer hospital stays and re-hospitalizations adding to the total cost burden.

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