Role of serotonin on pituitary-thyroid functions and antioxidants in diabetic male rats

Abstract

Diabetes mellitus causes an increase in oxidative stress. Serotonin is a hormone its level in circulation reduced in diabetes; recently, it has been found to possess antioxidant qualities. The purpose of the study was to look at the impact of diabetes on pituitary-thyroid functioning, and serotonin role in modulating these effects in a streptozotocin-induced diabetes mellitus rat model. The thirty-tow healthy male rats with a body weight of 180-200 gm were split equally into 4 groups, group [1[: control, group [2]: Serotonin, group [3]: diabetic, and group [4]: Serotonin-diabetic. The rats were weighed and serum levels of glucose, insulin, malondialdehyde, superoxide dismutase, catalase, glutathione peroxidase, serotonin, thyroid stimulating hormone, thyroxine, and triiodothyronine were measured. Our results presented that there was a significant increase in T3, T4, glucose, and MDA in the diabetic group compared to the control, while a significant decrease in T3, and T4, glucose, and MDA in the Serotonin with diabetic group compared to diabetic group. Furthermore, a significant decrease in TSH, serotonin, insulin and GPX, CAT, and SOD antioxidants in the diabetic group compared to control, while a significant increase in serum TSH, serotonin, insulin and CAT, GPX and SOD antioxidants in the Serotonin+diabetic group compared to diabetic group as well as a significant increase in serum insulin in the Serotonin group compared to all other groups. Serotonin plays a protective role against diabetes-induced and pituitary-thyroid disorder caused by diabetes which might be because of its antioxidant qualities and ability to maintain glucose and insulin balance.