The Effect of Aqueous Alcoholic Extract of Parsley Leaf (Petroselinum crispum) on Pituitary-Thyroid Hormones in Adult Male Rats Following Lead Acetate Poisoning

Background & aim: Lead is a heavy metal that enters the body as an environmental contaminant through the gastrointestinal tract or respiratory tract. Therefore, the aim of the present study was to determine the effect of aqueous alcoholic extract of Parsley leaf (Petroselinum crispum) on pituitary-thyroid hormones in adult male rats following lead acetate poisoning. Methods: The present experimental study was conducted in 2020 at the Islamic Azad University, Kazeron Branch. Forty-eight adult male Wistar rats were included in the study, which were divided into 6 groups of 8, including control and control groups (solvent treatment). Four experimental groups were treated with 200 mg / kg lead acetate, 200 mg / kg parsley leaf extract and simultaneously treated with lead acetate and 100 and 200 mg / kg parsley leaves. All prescriptions were performed by gavage for 21 days. Finally, after anesthesia of mice and blood sampling from animal hearts, serum levels of T4, T3 and TSH hormones were measured by ELISA method. The collected data were analyzed using analysis of variance and Tukey test. Results: The results indicated that serum levels of lead acetate T4 and T3 increased in animals receiving lead acetate and TSH showed a significant decrease at the level of p