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The autoimmunity-associated gene RGS1 affects the frequency of T follicular helper cells

Genes & Immunity volume 17, pages 228–238 (2016)Cite this article

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Abstract

RGS1 (regulator of G-protein signaling 1) has been associated with multiple autoimmune disorders including type I diabetes. RGS1 desensitizes the chemokine receptors CCR7 and CXCR4 that are critical to the localization of T and B cells in lymphoid organs. To explore how RGS1 variation contributes to autoimmunity, we generated Rgs1 knockdown (KD) mice in the nonobese diabetic (NOD) model for type I diabetes. We found that Rgs1 KD increased the size of germinal centers, but decreased the frequency of T follicular helper (TFH) cells. We show that loss of Rgs1 in T cells had both a T cell-intrinsic effect on migration and TFH cell frequency, and an indirect effect on B-cell migration and germinal center formation. Notably, several recent publications described an increase in circulating TFH cells in patients with type I diabetes, suggesting this cell population is involved in pathogenesis. Though Rgs1 KD was insufficient to alter diabetes frequency in the NOD model, our findings raise the possibility that RGS1 plays a role in autoimmunity owing to its function in TFH cells. This mechanistic link, although speculative at this time, would lend support to the notion that TFH cells are key participants in autoimmunity and could explain the association of RGS1 with several immune-mediated diseases.

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Acknowledgements

We acknowledge support from the Joslin DRC Flow Cytometry Core facility. This work was supported in part by a Career Development Award (2-2010-383) and an Innovative Award (1-INO-2014-169-A-V) from JDRF to SK, and by a DRC award (NIH Award Number P30DK036836) to the Joslin Diabetes Center.

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  1. Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA

    C Caballero-Franco & S Kissler

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  1. C Caballero-Franco
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Correspondence to S Kissler.

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Caballero-Franco, C., Kissler, S. The autoimmunity-associated gene RGS1 affects the frequency of T follicular helper cells. Genes Immun 17, 228–238 (2016). https://doi.org/10.1038/gene.2016.16

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