Metabotropic glutamate receptor 5 is associated with plasma GFAP dependent on age

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INTRODUCTION We investigated the relationship between metabotropic glutamate receptor subtype 5 (mGluR5) availability and plasma biomarkers in individuals with cognitive impairment. METHODS Seventy‐one subjects were included (17 cognitively unimpaired [CU], 10 early‐onset cognitive impairment [EOCI], and 44 late‐onset cognitive impairment [LOCI]). Amyloid beta (Aβ) pathology was quantified using 18 F‐Florbetapir, and mGluR5 availability by 18 F‐PSS232. The associations of mGluR5 availability, plasma biomarkers, and age were explored using partial correlation, mediation, and interaction analyses. RESULTS In individuals aged over 65 years and the LOCI group, mGluR5 availability was positively associated with plasma glial fibrillar acidic protein (GFAP). This positive relationship of mGluR5 with plasma GFAP in LOCI only survived in the Aβ‐positive subgroup ( r = 0.475, p = 0.011). DISCUSSION Increased mGluR5 availability is significantly associated with elevated plasma GFAP levels dependent on age in individuals aged over 65 years and the LOCI group.