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Tseng, Chieh-En Jane; Canales, Camila; Marcus, Rachel E; Parmar, Anjali J; Hightower, Baileigh G; Mullett, Jennifer E; Makary, Meena M; Tassone, Alison U; Saro, Hannah K; Townsend, Paige Hickey; Birtwell, Kirstin; Nowinski, Lisa; Thom, Robyn P; Palumbo, Michelle L; Keary, Christopher; Catana, Ciprian; McDougle, Christopher J; Hooker, Jacob M; Zürcher, Nicole R
Neuropsychopharmacology (New York, N.Y.), 06/2024, Letnik: 49, Številka: 7Journal Article
Sex-based differences in the prevalence of autism spectrum disorder (ASD) are well-documented, with a male-to-female ratio of approximately 4:1. The clinical presentation of the core symptoms of ASD can also vary between sexes. Previously, positron emission tomography (PET) studies have identified alterations in the in vivo levels of translocator protein (TSPO)-a mitochondrial protein-in primarily or only male adults with ASD, with our group reporting lower TSPO relative to whole brain mean in males with ASD. However, whether in vivo TSPO levels are altered in females with ASD, specifically, is unknown. This is the first pilot study to measure in vivo TSPO in the brain in adult females with ASD using CPBR28 PET-magnetic resonance imaging (MRI). Twelve adult females with ASD and 10 age- and TSPO genotype-matched controls (CON) completed one or two CPBR28 PET-MRI scans. Females with ASD exhibited elevated CPBR28 standardized uptake value ratio (SUVR) in the midcingulate cortex and splenium of the corpus callosum compared to CON. No brain area showed lower CPBR28 SUVR in females with ASD compared to CON. Test-retest over several months showed stable CPBR28 SUVR across time in both groups. Elevated regional CPBR28 SUVR in females with ASD stand in stark contrast to our previous findings of lower regional CPBR28 SUVR in males with ASD. Preliminary evidence of regionally elevated mitochondrial protein TSPO relative to whole brain mean in ASD females may reflect neuroimmuno-metabolic alterations specific to females with ASD.
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