Abstract
The manifestations of autism spectrum disorder (ASD) are highly heterogeneous. As many individuals with ASD have gastrointestinal (GI) comorbidities, ASD with GI problems is considered to be a subtype of ASD. Vitamin A (VA) plays an important role in the development of both the central and peripheral nervous system. However, the relationship between VA deficiency (VAD) and ASD with GI comorbidities is still unclear. We established rat models with different VA levels based on the valproic acid-induced autism model. Compared to autism model rats with VA normal (VAN), autism model rats with gestational VAD showed more severe autism-like behavior, increased GI transit time, and impairment of the enteric nervous system (ENS). Besides, the expression levels of retinoic acid receptor α (RARα) and Ret in autism model rats with VAD were decreased compared with those in rats with VAN. Supplementation with VA was found to effectively ameliorate autism-like behaviors and impairments of GI motility and the ENS in autism model rats with VAD. Chromatin immunoprecipitation results suggested that RARa can bind to the promoter region of the Ret gene and regulate the Ret signaling pathway. We speculate that VAD in autism might lead to impairments...Continue Reading
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