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Differentiated Mouse Adipocytes in Primary Culture: A Model of Insulin Resistance

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Association between altered thyroid state and insulin resistance.

Kunal B Kapadia¹, Parloop A Bhatt, Jigna S Shah

¹Department of Clinical Pharmacy, Shri Sarvajanik Pharmacy College, Mehsana, India.

Journal of Pharmacology & Pharmacotherapeutics

|May 26, 2012

Summary

Altered thyroid hormones, both hypo- and hyperthyroidism, are linked to insulin resistance (IR). This study found higher insulin levels and IR in both hypothyroid and hyperthyroid patients compared to euthyroid individuals.

Keywords:

Hypothyroidism hyperthyroidism insulin resistance

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Area of Science:

Endocrinology
Metabolic Disorders
Thyroid Research

Background:

Thyroid hormones play a crucial role in regulating metabolism.
Imbalances in thyroid function are associated with various metabolic disturbances.
Insulin resistance (IR) is a key factor in the development of type 2 diabetes and cardiovascular disease.

Purpose of the Study:

To investigate the association between altered thyroid hormone levels and insulin resistance.
To compare the degree of insulin resistance in hypothyroid and hyperthyroid patients versus euthyroid individuals.

Main Methods:

A cross-sectional study involving euthyroid (EU), hypothyroid (HO), and hyperthyroid (HR) patients.
Fasting blood samples were analyzed for thyroid stimulating hormone (TSH), glucose, insulin, and lipid profiles.
Insulin resistance was assessed using the Homeostatic Model Assessment (HOMA) index.

Main Results:

HOMA values and insulin levels were significantly higher in both HR and HO groups compared to the EU group (P < 0.05).
Patients with hypothyroidism (HO) showed significantly elevated cholesterol, triglycerides (TG), and low-density lipoprotein (LDL), with lower high-density lipoprotein (HDL) compared to EU and HR groups (P < 0.05).
HOMA and insulin levels positively correlated with TSH in HO patients and negatively correlated in HR patients.

Conclusions:

Both hypothyroidism and hyperthyroidism are associated with insulin resistance, mediated by mechanisms including altered insulin secretion and lipid profiles.
The degree of insulin resistance was comparable between hypothyroid and hyperthyroid patients.
Altered thyroid states can lead to insulin resistance, potentially contributing to glucose-related disorders like diabetes and dyslipidemia.