Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Depression and Autoimmune Thyroiditis - Their Relationship and the Effects of Treating Psychiatric and Thyroid Disorders on Changes in Clinical and Biochemical Parameters Including BDNF and Other Cytokines

Version 1 : Received: 20 July 2021 / Approved: 22 July 2021 / Online: 22 July 2021 (07:49:33 CEST)

How to cite: Kotkowska, Z.; Strzelecki, D. Depression and Autoimmune Thyroiditis - Their Relationship and the Effects of Treating Psychiatric and Thyroid Disorders on Changes in Clinical and Biochemical Parameters Including BDNF and Other Cytokines. Preprints 2021, 2021070507 (doi: 10.20944/preprints202107.0507.v1). Kotkowska, Z.; Strzelecki, D. Depression and Autoimmune Thyroiditis - Their Relationship and the Effects of Treating Psychiatric and Thyroid Disorders on Changes in Clinical and Biochemical Parameters Including BDNF and Other Cytokines. Preprints 2021, 2021070507 (doi: 10.20944/preprints202107.0507.v1).

Abstract

Various autoimmune diseases, including autoimmune hypothyroidism (AHT), are associated with a higher risk of developing mood disorders throughout life. Depression is accompanied by the changes in the levels of inflammatory and trophic factors, including interleukines (IL-1beta, IL-2, IL-6), interferon alpha (IFN-alpha), tumor necrosis factor alpha (TNF-alpha), C-reactive protein (CRP) and brain derived neurotrophic factor (BDNF). Similar disturbances in the cytokine profile are seen in AHT patients and their relatives. Disclosure of the relationship between the co-existence of depression and autoimmune subclinical thyroiditis indicates that the pathomecha-nism of depression may be related to the changes in the immune system, it is possible that both conditions may be caused by the same immune processes. The above hypothesis is indirectly sup-ported by the observations that the treatment with both antidepressants and levothyroxine leads to a decrease in the levels of proinflammatory cytokines with an increase in BDNF concentrations, simultaneously correlating with an improvement in the clinical parameters. However, so far there are no long-term studies determining the causal relationship between depression, thyroid auto-antibodies, and cytokine profile, which could bring us closer to understanding the interrelation-ships between them and facilitate the use of an adequate pharmacotherapy, not necessarily psy-chiatric. We consider the above issues insufficiently investigated but of great importance. This ar-ticle is an overview of the available literature as well as an introduction to our research project.

Keywords

depression; chronic autoimmune thyroiditis; BDNF

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