Related Experiment Video
Updated: Jun 28, 2026
04:33
Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
Published on: April 26, 2024
Thyroid activity in patients with major depression
Tamara Stipcević1, Nela Pivac, Dragica Kozarić-Kovacić
1Department of Molecular Medicine, Institute "Ruder Bosković", Zagreb, Croatia. tamara@irb.hr
Collegium Antropologicum
|November 6, 2008
Summary
Major depression is linked to altered thyroid function. This study found lower serum levels of triiodothyronine (T3) and thyroid-stimulating hormone (TSH) in patients with depression compared to healthy individuals.
Area of Science:
- Neuroendocrinology
- Psychiatry
- Thyroid Research
Background:
- Hypothalamus-pituitary-thyroid (HPT) axis dysfunction is implicated in major depression.
- Thyroid hormone imbalances may contribute to the pathophysiology of depressive disorders.
Purpose of the Study:
- To investigate serum levels of total triiodothyronine (T3), total thyroxine (T4), and thyroid-stimulating hormone (TSH) in patients with major depression.
- To compare these thyroid hormone levels between depressed individuals and healthy controls.
Main Methods:
- Serum T3, T4, and TSH levels were measured in 53 medication-free patients with major depression and 49 healthy controls.
- Participants were carefully screened for exclusion criteria including other psychiatric disorders, thyroid dysfunction, and somatic illnesses.
- Major depression diagnosis was confirmed using DSM-IV criteria via a structured clinical interview.
Main Results:
- Patients with major depression exhibited significantly lower serum levels of T3 and TSH compared to healthy controls.
- No significant difference in serum T4 levels was observed between the depressed group and the control group.
Conclusions:
- Altered thyroid hormone levels, specifically lower T3 and TSH, are associated with major depression.
- These findings underscore the importance of considering thyroid abnormalities in the neurobiological understanding of depression.
- Further research into thyroid hormone activity and behavioral endophenotypes in depression is warranted.
Related Concept Videos
01:23Hypothyroidism II: Pathophysiology
Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
01:27Depressive Disorders: MDD and Dysthymia
Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
01:23Antidepressant Drugs: MAOIs and Other Agents
Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
01:20Synthesis and Regulation of Thyroid Hormones
Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
01:27Hyperthyroidism II: Pathophysiology
Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
01:25Hyperthyroidism I: Introduction
Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...