Role of ascorbic acid in cadmium-induced thyroid dysfunction and lipid peroxidation

Area of Science:

• Biochemistry
• Toxicology
• Endocrinology

Background:

• Heavy metals like cadmium pose significant health risks.
• Cadmium exposure can lead to thyroid dysfunction and increased oxidative stress.
• Ascorbic acid (vitamin C) is a known antioxidant with potential protective effects.

Purpose of the Study:

• To investigate the protective effects of ascorbic acid (AA) against cadmium-induced thyroid dysfunction.
• To determine the impact of AA on lipid peroxidation (LPO) levels following cadmium exposure.
• To elucidate the role of AA's antioxidant properties in mitigating cadmium toxicity.

Main Methods:

• Swiss male mice were administered cadmium (1.0 mg/kg) alone or with ascorbic acid (1 mM) daily for 15 days.
• Serum thyroid hormone concentrations (T3, T4) were measured.
• Hepatic type I iodothyronine 5'-monodeiodinase (5'D-I) activity was assessed.
• Lipid peroxidation (LPO) levels were quantified.

Main Results:

• Cadmium exposure significantly decreased serum thyroid hormones and hepatic 5'D-I activity.
• Cadmium exposure increased lipid peroxidation levels.
• Ascorbic acid treatment restored hepatic 5'D-I activity and serum triiodothyronine (T3) levels.
• Ascorbic acid ameliorated the increased lipid peroxidation caused by cadmium.
• Ascorbic acid did not restore serum thyroxine (T4) levels.

Conclusions:

• Ascorbic acid exhibits a protective effect against cadmium-induced thyroid dysfunction in mice.
• The antioxidant action of ascorbic acid plays a key role in mitigating cadmium's adverse effects on the thyroid and lipid peroxidation.
• Further research may explore AA's therapeutic potential in heavy metal toxicity.