Vol 61, No 3 (2023)
Original paper
Published online: 2023-09-14
Curcumin exerts protective effects on the thyroid gland in propylthiouracil-treated rats
1
Abstract
Introduction. Among the plant ingredients, some compounds interfere with the functions of the thyroid gland. However, there is limited research on the effect of curcumin (CMN) on the functions of this gland. The aim of this study was to analyze the effect of CMN on morphology, histochemical reactivity of cytochrome c oxidase (CCO) and secretion functions of the thyroid gland under conditions of hypothyroidism induced by propylthiouracil (PTU). Material and methods. The rats were treated for 30 days by gavage with CMN (100 mg/kg b.w.) and/or PTU (1 mg/kg b.w.). Control rats received vehicle only. Histomorphometric tests were performed on the thyroid glands, cytochrome c oxidase activity was visualized using the histochemical method, and the levels of thyroid hormones were measured using the radioimmunoassay method. Results. Rats receiving PTU showed compensatory changes in their thyroid glands, including a significant increase in thyroid epithelium height, a decrease in colloid volumen density, a decrease in the percentage of small follicles, an increase in medium-sized follicles compared to the control group, as well as a significant increase in CCO histochemical reactivity in the columnar epithelium and a decrease in FT4 serum level compared to the control group. The administration of CMN reversed these adverse changes caused by PTU. The PTU + CMN group exhibited a significant decrease in the height of the thyroid follicle epithelium compared to the PTU group. The percentage of small and medium-size follicles in the CMN + PTU group did not differ from the control group. Furthermore, CCO reactivity in the cubic epithelium and serum FT4 levels increased compared to the PTU group. Administration of CMN alone resulted in a significant increase in FT4 levels compared to the control group. Conclusions. The administration of CMN to rats with induced hypothyroidism resulted in a reduction of hyperplasia, hypertrophy, and increase in secretory activity of the thyroid gland. These findings suggest the protective effect of CMN against induced hypothyroidism.
Keywords: ratthyroidpropylthiouracilcurcuminhistomorphometrycytochrome c oxidasehistochemistry
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