Oligodendrocyte precursor cells (OPCs) are a dynamic and heterogeneous population of glial cells essential for brain development and myelination. Beyond their well-established role in oligodendrogenesis, emerging evidence suggests that OPCs contribute to synaptic regulation, neuronal communication, and brain plasticity. Recent studies have increasingly implicated OPC dysfunction in the pathophysiology of psychiatric disorders, particularly schizophrenia (SCZ), bipolar disorder (BD), and major depressive disorder (MDD). This narrative review integrates clinical, genetic, transcriptomic, and histological findings to examine the role of OPC alterations in mental illnesses. In SCZ, OPC abnormalities predominantly affect myelination, but recent data also suggest deficits in non-canonical functions, including neuron–OPC communication. Findings in BD largely mirror those in SCZ, implying shared OPC-related mechanisms across these disorders. In contrast, OPC involvement in MDD appears more complex, with evidence supporting both myelination deficits and non-canonical dysfunctions, such as impaired neuro–glial interactions and perineuronal network alterations. The developmental timing of OPC dysfunction may represent a common denominator underlying psychiatric disorders, as early-life stress and neurodevelopmental disturbances have been linked to OPC impairments. Moreover, given the shared developmental origins of OPCs and parvalbumin-positive interneurons, disruptions in their mutual interactions may contribute to broader neural network dysregulation. Despite these insights, the field remains in its infancy. Future studies integrating independent human cohorts with robust preclinical models are needed to clarify the extent of OPC involvement in psychiatric pathophysiology. Understanding OPC dysfunction may reveal novel biomarkers and open new avenues for individualized therapeutic interventions and preventive strategies in mental health.

Background: Art therapy is increasingly recognized as a valuable complementary intervention for individuals with eating disorders (EDs), who frequently experience comorbid anxiety and difficulties with emotional regulation. However, few studies have examined its short-term effects on state and trait anxiety within structured clinical settings. Methods: This pilot study involved 19 adolescent females (mean age 17.7 ± 2.1 years) diagnosed with anorexia nervosa (AN) or bulimia nervosa (BN) and admitted to the Mariconda Regional Residence for Eating Disorders (ASL Salerno, Italy) in residential or semi-residential treatment. Participants completed a structured six-week cycle of weekly textile-based art therapy sessions, designed to promote emotional expression and body reconnection. State and trait anxiety levels were assessed pre- and post-session using the State-Trait Anxiety Inventory (STAI). Repeated-measures ANOVA was used to analyze state anxiety changes; a linear mixed-effects model was applied to trait anxiety. Results: State anxiety significantly decreased immediately after sessions (p = 0.002). A significant main effect of session (p = 0.01) and a time × session interaction (p = 0.025) indicated variability across sessions. Trait anxiety showed a non-significant trend toward reduction (p = 0.11); however, reductions were significant at sessions 4 (p = 0.015), 5 (p < 0.001), and 6 (p = 0.005). Conclusions: Art therapy may offer immediate reductions in state anxiety and may contribute to a longer-term reduction in trait anxiety with 4–6 sessions. These findings support integrating creative interventions within multidisciplinary ED treatment programs. Future research with larger samples and control groups is needed to confirm and expand upon these preliminary results.

Background: Addictive disorders are characterized by the dysregulation of neural circuits involved in reward processing, salience attribution, emotional regulation, and cognitive control. Traditional neuroimaging paradigms based on static or two-dimensional stimuli show limited ecological validity and may fail to capture the contextual complexity of real-world addictive triggers. Immersive virtual reality (VR) offers a novel approach to simulate realistic, multisensory environments capable of eliciting craving and emotional responses. Although several reviews have examined VR in addictive disorders, most combined immersive and non-immersive tools and did not restrict inclusion to studies with brain-based outcomes. Methods: This systematic review with narrative synthesis was conducted in PubMed/MEDLINE and APA PsycINFO for studies published up to 30 December 2025. This systematic review followed PRISMA 2020 and was prospectively registered in PROSPERO; due to heterogeneity, findings were synthesized narratively. Eligible studies included human participants with substance-related or behavioral addictions and employed immersive VR paradigms (e.g., head-mounted display–based environments) combined with neuroimaging or neurophysiological measures (EEG, fMRI, fNIRS, PET, or DTI). Risk of bias was assessed using ROB-2 or ROBINS-I, and overall certainty of evidence was evaluated with the GRADE framework. Results: Ten studies met the inclusion criteria, encompassing over 1450 participants with alcohol, nicotine, methamphetamine, opioid use disorders, and internet gaming disorder. Immersive VR was associated with craving-related neural responses across modalities, involving prefrontal, insular, limbic, and striatal networks. EEG studies reported spectral power changes associated with craving and attentional salience, while fMRI, fNIRS, and PET studies demonstrated activation and modulation of executive control and reward-related circuits. Preliminary longitudinal and interventional studies indicate that repeated VR exposure may induce neurobiological changes consistent with therapeutic modulation. Conclusions: Immersive VR combined with neuroimaging supports the use of immersive VR as an ecologically grounded framework to probe addiction-related brain circuits; however, larger trials and standardized reporting are needed to strengthen clinical translation. Future studies should prioritize adequately powered randomized designs, harmonized VR cue-reactivity paradigms, and transparent neuroimaging reporting to enable reproducibility and cumulative inference.

Background: Creative Expressive Therapies, including Art Therapy and Dance/Movement Therapy (DMT), are increasingly integrated as adjunctive interventions in the treatment of complex psychiatric conditions. However, comparative evidence regarding their differential effects across diagnostic groups remains limited. Methods: This exploratory quasi-experimental 2 × 2 factorial study compared Art Therapy and DMT, delivered as adjuncts to treatment as usual, in patients with first-episode psychosis (FEP) and eating disorders (EDs) (N = 36). Participants received ten weekly group sessions. Changes in perceived well-being, emotional tension regulation, and physical tension regulation were assessed at baseline and post-intervention using self-report measures. Data were analyzed using repeated-measures ANOVA and linear mixed-effects models. Results: Significant pre–post improvements were observed across all outcome domains, indicating a transdiagnostic effect of Creative Expressive Therapies. Differential response patterns emerged according to clinical profile and therapeutic modality. DMT was associated with relatively greater improvements in physical tension regulation in patients with EDs, whereas Art Therapy showed relatively greater effects on emotional tension regulation in patients with FEP. Conclusions: Within the limitations of an exploratory, non-randomized design and the use of non-validated outcome measures, the findings suggest modality-specific patterns of response to Creative Expressive Therapies. These results should be considered hypothesis-generating and support further investigation through adequately powered randomized controlled trials employing validated clinical and neurobiological outcomes.

Background: Histamine H3 receptor-targeting compounds modulate histaminergic tone and downstream monoaminergic/arousal circuits and have been proposed to exert potential antidepressant-like effects in preclinical models. Methods: We conducted a systematic review and meta-analysis of rodent studies evaluating H3-related interventions on depression-like behavior. We screened 60 records, assessed 12 studies qualitatively (four CORE, eight sensitivity), and included nine studies in random-effects meta-analyses (REML). Primary outcomes were the forced swim test (FST) and tail suspension test (TST); effect sizes were summarized as Hedges’ g (positive values indicate reduced immobility). Results: In the primary ALL analysis, H3-related interventions improved FST outcomes (g = 1.40, 95% CI 0.83–1.97; k = 7) and were also associated with improved TST outcomes, albeit with substantial heterogeneity (g = 2.27, 95% CI 0.80–3.73; k = 5). CORE-only analyses were directionally consistent but less precise (FST: g = 1.11, 95% CI −0.06–2.27; k = 3; TST: g = 2.95, 95% CI 0.87–5.02; k = 2). Sucrose preference was reported in one study and indicated improvement (g = 1.61, 95% CI 0.29–2.92). Conclusions: H3-related interventions show an antidepressant-like signal in rodent FST and TST, with greater heterogeneity for TST, highlighting the need for more standardized and adequately powered preclinical studies.