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ABSTRACT LRRK2 is implicated in Parkinson’s disease (PD) microbiome–gut–brain axis. We compared plasma lipopolysaccharide-binding protein (LBP) and soluble CD14 (sCD14), markers of gut permeability and endotoxin exposure, in PD patients with/without LRRK2 p.G2385R and/or p.R1628P, and controls, and examined their associations with systemic inflammation and clinical severity. Neither marker differed between groups. Across PD patients, LBP correlated with higher IL-6, TNF-α and worse motor function, while sCD14 correlated with higher IL-6, CCL5 and worse constipation. These findings highlight the clinical relevance of endotoxin-related immune signaling in PD, without LRRK2 risk variant-specific associations and identify LBP as an emerging marker of inflammatory burden.
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