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Microcystin-LR induced thyroid dysfunction and metabolic disorders in mice
Yanyan Zhao1, Qingju Xue1, Xiaomei Su1
1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, PR China.
Toxicology
|December 16, 2014
Summary
Microcystins (MCs) disrupt animal endocrine systems. MC-LR exposure in mice caused thyroid dysfunction, altering metabolism and energy expenditure, highlighting endocrine toxicity risks.
Area of Science:
- Environmental Toxicology
- Endocrinology
- Metabolic Disorders
Background:
- Microcystins (MCs) are recognized endocrine disruptors.
- The impact of MCs on thyroid function and energy metabolism remains unclear.
Purpose of the Study:
- To investigate the effects of MC-LR exposure on thyroid hormones and energy metabolism in mice.
- To elucidate the mechanisms underlying MC-LR-induced metabolic disruption.
Main Methods:
- Mice were administered 5 or 20 μg/kg MC-LR intraperitoneally for 4 weeks.
- Assessed metabolic parameters (glucose, triglycerides, cholesterol), thyroid hormone levels (FT3, FT4), and gene expression (TH receptor, mTOR).
Main Results:
- MC-LR exposure (20 μg/kg) induced hyperphagia, polydipsia, and weight loss.
- Observed disrupted glucose, triglyceride, and cholesterol metabolism.
- Increased FT3 and decreased FT4 levels, alongside elevated brain TH receptor and mTOR expression, were noted.
Conclusions:
- MC-LR exposure causes significant thyroid dysfunction and metabolic disorders in mice.
- Altered thyroid hormone levels and mTOR signaling contribute to MC-LR's endocrine toxicity.
- Findings provide insights into MC-LR's effects on mammalian endocrine and metabolic systems.
