Evaluation of Disorders of Contractile Activity of Smooth Muscle Tissues in 9-Month-Old Rats with a Model of Autism.

We studied the effect of carbachol, P2 receptor agonists, and electric field stimulation on mechanical activity of isolated preparations of the duodenum, ileum, bladder, and vas deferens in 9-month-old rats with the valproic acid-induced model of autism. It was found that the contractions and relaxations of the isolated intestine of the experimental rats caused by various agonists and electric field stimulation did not differ from those in control animals. Carbachol induced more significant contractions of the bladder in rats with autism model than in controls and electric field stimulation induced more significant contractions of the vas deferens. We did not find significant differences in the effect of ATP, α,β-methylene-ATP and 2-methylthio-ATP on the contraction and relaxation of the studied smooth muscle organs of rats of the experimental and control groups. It was concluded that 9-month-old rats with an autism model retained increased contractile activity of the bladder and vas deferens, while intestinal contractions in experimental and control animals of this age did not differ significantly.