4.0 Article

Effect of L-thyroxine treatment on peripheral blood dendritic cell subpopulations in patients with Hashimoto's thyroiditis

Journal

FOLIA HISTOCHEMICA ET CYTOBIOLOGICA
Volume 52, Issue 2, Pages 138-143

Publisher

VIA MEDICA
DOI: 10.5603/FHC.2014.0013

Keywords

Hashimoto's thyroiditis; L-thyroxine; hypothyroidism; autoimmunity; dendritic cells; CD86; CD91

Funding

  1. Polish Mother's Memorial Hospital - Research Institute, Lodz, Poland [2013/VII/22]

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Recent reports suggested dendritic cells (DCs) to be important players in the pathogenesis of autoimmune thyroid processes in humans. However, there are virtually no data addressing the influence of thyroid autoaggression-associated disturbances of thyrometabolic conditions on DCs biology. The aim of the study was to evaluate the influence of L-thyroxine supplementation on conventional and plasmacytoid peripheral blood DCs subtypes in patients with hypothyroidism due to Hashimoto's thyroiditis (HT). Eighteen patients with newly diagnosed hypothyroidism due to HT were included into the study. All patients received L-thyroxine treatment with doses adjusted to reach euthyroidism. Peripheral blood DC subtypes structure and immunoregulatory phenotype were analyzed by flow cytometry in the same patient prospectively at two time points: (i) before and (ii) 3 months after beginning of L-thyroxine treatment (hypothyroidism vs. euthyroidism, respectively). Percentage of plasmacytoid DCs in peripheral blood mononuclear cells fraction was significantly decreased in the course of L-thyroxine treatment (0.27 +/- 0.19 vs. 0.11 +/- 0.08; p < 0.05), whereas we did not observe any changes in the number of conventional DCs. However, the phenotypic analysis showed a significant increase of conventional DCs expressing CD86 and CD91 (64.25 +/- 21.6% vs. 86.3 +/- 11%; p < 0.05 and 30.75 +/- +/- 11.66% vs. 44.5 +/- 13.3%; p < 0.05; respectively) in euthyroid patients. Standard L-thyroxine supplementation in HT patients exerted significant immunoregulatory effects, associated with quantitative and phenotypic changes of peripheral blood DC subpopulations.

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