The PPARδ agonist GW0742 restores neuroimmune function by regulating Tim-3 and Th17/Treg-related signaling in the BTBR autistic mouse model.

Neurochem Int

Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia; Department of Pharmacology and Toxicology, College of Pharmacy, Al-Azhar University, Cairo, Egypt.

Published: November 2018


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Article Abstract

Autism spectrum disorders (ASD) are neurodevelopmental disorders that are characterized by repetitive behaviors, and impairments in communication and social interaction. Studies have shown that activation of peroxisome proliferator-activated receptor-delta (PPARδ) causes anti-inflammatory effects in animal models of neuroinflammatory diseases. We investigated the possible anti-inflammatory effect of a PPARδ agonist, GW0742 in the BTBR T Itpr3tf/J (BTBR) mouse model of autism. BTBR and C57BL/6 (B6) mice were treated orally with GW0742 (30 mg/kg, p.o., once daily) for 7 days. Effect of GW0742 treatment on repetitive behavior, marble burying, and thermal sensitivity response was assessed on day 8. We further examined the effect of GW0742 treatment on immunological parameters in splenocytes using flow cytometry (CD4TIM-3, IL-17ATIM-3, IL-17ACD4, RORγTTIM-3, RORγTCD4, Stat3TIM-3, Foxp3TIM-3, Foxp3CD4, and IFN-γCD4). We also explored the effects of GW0742 on mRNA and protein expression of TIM-3, IL-17A, RORγT, Stat3, IFN-γ, Foxp3, and IL-10 in the brain tissue using RT-PCR and western blot analyses. GW0742 treatment substantially decreased repetitive behaviors, and lowered thermal sensitivity response in BTBR mice. GW0742 attenuated the expression of inflammatory markers such as IL-17A, RORγT, Stat3, TIM-3, and IFN-γ, while upregulating anti-inflammatory markers such as IL-10/Foxp3 both in the brain and periphery of BTBR mice. In conclusion, this study suggests that GW0742 corrects neurobehavioral dysfunction in BTBR mice which is concurrent with modulation of multiple signaling pathways.

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http://dx.doi.org/10.1016/j.neuint.2018.09.006DOI Listing

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