Vitamin A Deficiency Induces Autistic-Like Behaviors in Rats by Regulating the RARβ-CD38-Oxytocin Axis in the Hypothalamus.
Vitamin A (VA) is an essential nutrient for the development of the brain. We previously found that children with autism spectrum disorder (ASD) have a significant rate of VA deficiency (VAD). In the current study, we aim to determine whether VAD is a risk factor for the generation of autistic-like behaviors via the transcription factor retinoic acid receptor beta (RARβ)-regulated cluster of differentiation 38 (CD38)-oxytocin (OXT) axis.
METHODS AND RESULTS:
Gestational VAD or VA supplementation (VAS) rat models were established, and the autistic-like behaviors in the offspring rats were investigated. The different expression levels of RARβ and CD38 in hypothalamic tissue and serum retinol and OXT concentration were tested. Primary cultured rat hypothalamic neurons were treated with all trans retinoic acid (atRA) and recombinant adenoviruses carrying the rat RARβ (AdRARβ) or RNA interference virus RARβ-siRNA (siRARβ) were used to infect neurons to change RARβ signal. Western blotting, chromatin immunoprecipitation (ChIP) and intracellular Ca2+ detections were used to investigate the primary regulatory mechanism of RARβ in the CD38-OXT signaling pathway. We found that gestational VAD increased autistic-like behaviors and decreased the expression levels of hypothalamic RARβ and CD38 and serum OXT levels in the offspring. VAS ameliorated these autistic-like behaviors and increased the expression levels of RARβ, CD38 and OXT in the gestational VAD pups. In vitro, atRA increased the Ca2+ excitability of neurons, which might further promote the release of OXT. Different CD38 levels were induced in the neurons by infection with different RARβ adenoviruses. Furthermore, atRA enhanced the binding of RARβ to the proximal promoter of CD38, indicating a potential up-regulation of CD38 transcriptional activity by RARβ.
Gestational VAD might be a risk factor for autistic-like behaviors due to the RARβ signal suppression of CD38 expression in the hypothalamus of the offspring, which improved with VAS during the early-life period. The nutritional status during pregnancy and the early-life period is important in rats. This article is protected by copyright. All rights reserved.
This article is protected by copyright. All rights reserved.
Vitamin A; autism; oxytocin; retinoic acid receptor beta
Dr. Manish Bhatia
BHMS, BCA, M.Sc. Homeopathy (UCLAN, UK), CICH (IACH, Greece)
Dr. Manish Bhatia is the Founder Director of Hpathy.com, world’s leading homeopathy portal, serving homeopathy to more than half a million people every month. He is also Editor of Homeopathy for Everyone.
He runs a consultation office at Jaipur (Asha Homeopathy) and is one of the most well known Indian homeopaths globally. He has been practicing since 2001 and is helping Autism and other psychiatric patients since 2006. He was awarded Rajasthan’s foremost Raja Pajvan Dev Award For Excellence in the field of Medicine in 2015.
He has been working as an Asso. Professor of Organon of Medicine at S. K. Homeopathic Medical College since 2002. He was awarded with the prestigious APJ Abdul Kalam State Level Teacher’s Award in 2016. He has also given seminars and webinars in several countries of Europe, Americas and Australia.
He is the author of Lectures on Organon of Medicine Vol. I & II (English, Bulgarian, German editions), which are approved by the Central Council of Homeopathy (India) for BHMS and MD (Hom) syllabus. He is a contributing author to the book “Homeopathy and Mental Health Care: Integrative Practice, Principles and Research” and co-editor of “The Fireside Book of Homeopathy Tales.”