Serum LAIR-2 Is Increased in Autoimmune Thyroid DiseasesReportar como inadecuado

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Leukocyte-associated Ig-like receptor LAIR is a small family-receptor able to inhibit immune cell function via collagen binding. It exists as both membrane-bound and soluble forms. LAIR-1 functions as an inhibitory receptor on natural killer cells, T lymphocytes and monocytes. In addition to LAIR-1, the human genome encodes LAIR-2, a soluble homolog. Several studies have focused on LAIR-1, whereas few investigations concentrate on the expression and function of LAIR-2. We demonstrate the presence of high LAIR-2 levels in 74-80 sera from patients with autoimmune thyroid diseases both Graves’ disease and autoimmune thyroiditis. LAIR-2 levels seemed not to be related to specific clinical manifestations, such as thyroid functions hypo- or hyperthyroidism, or specific clinical features such as ophtalmopathy. In addition, serum LAIR-2 is able, in vitro, to bind its natural ligand, collagen. Since LAIR-2 has been found to have higher affinity for collagens than LAIR-1 did, we hypothesize a potential regulating capability of serum LAIR-2 in finally regulating the inhibitory capability of LAIR-1.

Autor: Rita Simone, Giampaola Pesce, Princey Antola, Domenico F. Merlo, Marcello Bagnasco, Daniele Saverino



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