Histamine H3 Receptor Antagonist, Ciproxifan, Alleviates Cognition and Synaptic Plasticity Alterations in a Valproic Acid-induced Animal Model of Autism

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 2022 May 10

PMID 35538250

Authors

Farahnaz Taheri

Khadijeh Esmaeilpour

Gholamreza Sepehri

Vahid Sheibani

Naeem Ur Rehman

Marzieh Maneshian

Affiliations

Soon will be listed here.

Abstract

Rationale: Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by deficits in social communication and cognitive behaviors. Histamine H3 receptor (H3R) antagonists are considered as therapeutic factors for treating cognitive impairments.

Objectives: The aim of the present study was to evaluate the effects of the H3R antagonist, ciproxifan (CPX), on cognition impairment especially, spatial learning memory, and synaptic plasticity in the CA1 region of the hippocampus in autistic rats.

Methods: Pregnant rats were injected with either valproic acid (VPA) (600 mg/kg, i.p.) or saline on an embryonic day 12.5 (E12.5). The effects of the H3R antagonist, ciproxifan (CPX) (1, 3 mg/kg, i.p.), were investigated on learning and memory in VPA-exposed rat pups and saline-exposed rat pups using Morris water maze (MWM) and social interaction tasks. The H2R antagonist, famotidine (FAM) (10, 20, 40 mg/kg, i.p.), was used to determine whether brain histaminergic neurotransmission exerted its procognitive effects through the H2R. In addition, synaptic reinforcement was evaluated by in vivo field potential recording.

Results: The results showed that VPA-exposed rat pups had significantly lower sociability and social memory performance compared to the saline rats. VPA-exposed rat pups exhibited learning and memory impairments in the MWM task. In addition, VPA caused suppression of long-term potentiation (LTP) in the CA1 area of the hippocampus. Our results demonstrated that CPX 3 mg/kg improved VPA-induced cognitive impairments and FAM 20 mg/kg attenuated cognitive behaviors as well as electrophysiological properties.

Conclusions: CPX 3 mg/kg improved VPA-induced impairments of LTP as well as learning and memory deficits through H2R.

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