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Alessandro Antonelli, Mario Rotondi, Poupak Fallahi, Mariano Grosso, Giuseppe Boni, Silvia Martina Ferrari, Paola Romagnani, Mario Serio, Giuliano Mariani, Ele Ferrannini, Iodine-131 Given for Therapeutic Purposes Modulates Differently Interferon-γ-Inducible α-Chemokine CXCL10 Serum Levels in Patients with Active Graves’ Disease or Toxic Nodular Goiter, The Journal of Clinical Endocrinology & Metabolism, Volume 92, Issue 4, 1 April 2007, Pages 1485–1490, https://doi.org/10.1210/jc.2006-1571
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Abstract
Context: The mechanism of activation of the immune system after iodine-131 (131I) treatment of hyperthyroidism is still not fully clarified. Serum levels of CXCL10, a prototype of the CXC family of chemokines, are increased in several endocrine autoimmune conditions, and this chemokine plays a role at least in the initial phases of thyroid autoimmune disease and in Graves’ disease (GD).
Objective, Design, and Patients: The aim of the present study was to measure the serum CXCL10 levels in 20 patients with GD and 10 patients with toxic nodular goiter (TNG) before and 6 months after 131I treatment, when patients had achieved euthyroidism. Forty healthy subjects and 40 patients with autoimmune thyroiditis served as control groups.
Results: Before 131I, mean CXCL10 was significantly higher in patients with GD and thyroiditis than controls or those with TNG. Serum CXCL10 levels significantly decreased in GD patients 6 months after 131I treatment, whereas they remained within normal limits in TNG patients after restoration of euthyroidism by 131I.
Conclusions: In conclusion, our results demonstrate that high serum CXCL10 levels are associated with the hyperthyroid phase in GD but not TNG, providing further evidence for a minimal role of hyperthyroidism per se in determining high CXCL10 levels and showing a strong association with the autoimmune process. The reduction of CXCL10 levels after 131I treatment in GD only shows that the thyroid gland itself is the main source of circulating CXCL10.