Methylphenidate modulates the ınflammatory response and PI3K signaling in macrophages

This study explored the potential immunomodulatory role of methylphenidate (MPH), specifically focusing on its modulation of the inflammatory response and the phosphoinositide 3-kinase (PI3K) signaling pathway in J774.2 murine macrophages. Cells were treated with increasing concentrations of MPH (1, 5, and 10 μg/mL) in the presence or absence of lipopolysaccharide (LPS). Cytokine concentrations (TNF-α, IL-6, IL-12p40, and GM-CSF) were quantified using ELISA, and intracellular activation of the PI3K signaling pathway was assessed via flow cytometry. It was demonstrated that MPH strongly suppressed the inflammatory cytokines TNF-α, IL-6, and IL-12p40 in a dose-dependent manner (p < 0.001), with significant suppression of GM-CSF evident at higher doses. Furthermore, flow cytometric analysis revealed that PI3K signaling was modulated in the presence of LPS, indicating a complex regulatory mechanism. Collectively, these findings suggest that MPH holds therapeutic potential for neuroinflammatory disorders through the dual action of suppressing inflammatory cytokines and modulating PI3K signaling pathways.