[Structural-functional changes in the thyroid gland after chronic exposure to the dioxin-containing herbicide 2,4-D]

Area of Science:

• Toxicology
• Endocrinology
• Histopathology

Background:

• The herbicide 2,4-D (2,4-dichlorophenoxyacetic acid) is widely used in agriculture.
• Understanding its toxicological effects on endocrine organs is crucial for public health.
• The thyroid gland is a key endocrine organ susceptible to environmental toxins.

Purpose of the Study:

• To investigate the effects of subchronic exposure to the herbicide 2,4-D on the thyroid gland in a rodent model.
• To evaluate histological and biochemical alterations in the thyroid following 2,4-D administration.

Main Methods:

• Adult white rats were administered a 40% solution of 2,4-D (amine salt) via lavage.
• Two dose levels (1.0 mg/kg and 0.5 mg/kg) were used over a 3-month exposure period.
• Thyroid tissues were examined for destructive changes, inflammatory infiltrates, follicular morphology, and enzyme activity.

Main Results:

• Destructive changes within thyroid follicles were observed.
• Presence of lymphohistiocytic infiltrates indicated an inflammatory response.
• Areas showing morphological signs of thyroid activation, characterized by a predominance of small follicles, were noted.
• Elevated alkaline phosphatase and glycoproteins activity were detected in thyrocytes.

Conclusions:

• Subchronic exposure to the herbicide 2,4-D induces significant histopathological changes in the rat thyroid gland.
• The observed alterations suggest a disruption of thyroid homeostasis and potential functional impairment.
• Further research is warranted to elucidate the long-term consequences and mechanisms of 2,4-D toxicity on the thyroid.