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. 2017 Feb;71(2):158-162.
doi: 10.1080/08039488.2016.1242650. Epub 2016 Oct 31.

IL6-174G > C genetic polymorphism influences antidepressant treatment outcome

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IL6-174G > C genetic polymorphism influences antidepressant treatment outcome

Serafim Carvalho et al. Nord J Psychiatry. 2017 Feb.

Abstract

Background: Major depressive disorder is a condition associated with dysregulated cytokine levels; among these, IL6. Furthermore, genetic variations within cytokine genes have been proposed to predict antidepressant treatment outcome.

Objectives: This study aims to evaluate the role of IL6-174G > C and IL6R D358A A > C functional polymorphisms in antidepressant treatment phenotypes, specifically remission, relapse, and treatment resistant depression (TRD).

Methods: The referred polymorphisms were genotyped in 80 MDD patients followed at Hospital Magalhães Lemos, Portugal, within a period of 27 months.

Results: It was found that patients carrying IL6-174 GC genotype present a protection towards the development of TRD (OR = 0.242; 95% CI = 0.068-0.869; p = .038), when compared with GG genotype. Additionally, carriers of IL6-174 CC genotype remit earlier than patients with IL6-174 GG/GC genotypes, with a median time to remission of 6 weeks for CC carriers and 15 weeks for GG or GC carriers (p = .030, Log-rank test). No association was found between IL6R D358A genetic polymorphism and any of the treatment phenotypes evaluated.

Conclusions: The IL6-174G > C polymorphism influences antidepressant treatment outcome in this sub-set of MDD patients, providing a putative mechanistic link for the dysregulated IL-6 levels described in the literature in patients with TRD.

Keywords: IL6; antidepressants; genetic polymorphisms; treatment resistant depression.

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