Abstract
Primary Sjögren’s syndrome (pSS) is a chronic autoimmune disorder that particularly compromises the function of exocrine glands. The pathogenetic mechanisms of this autoimmune exocrinopathy have not been fully elucidated. Since increasing evidence actually suggests that the epidermal growth factor receptor (EGFR) pathway has a major impact on the inflammatory/immune reactions of the epithelial cells, in the apparent effort of enhancing innate immune defense while opposing overactivation of pro-inflammatory functions, the focus of the work presented here is clarify whether the EGFR–extracellular-signal-regulated kinase (ERK) pathway plays a role in the pro-inflammatory responses mounted by pSS salivary gland epithelial cells (SGEC). Investigations revealed that the EGFR-mediated activation of the downstream effectors ERK1/2 in pSS SGEC appeared to require ADAM17-dependent release of the endogenous EGFR ligand amphiregulin and transactivation of the EGFR. Moreover, blockade of amphiregulin bioactivity using a neutralizing Ab significantly reduced EGFR transactivation and ERK1/2 phosphorylation. In addition, pSS SGEC treated with the specific ADAM17 inhibitor TAPI-1 and with the EGFR inhibitor AG1478 exhibited deactivated AREG/EGFR/ERK signaling pathway and reduced pro-inflammatory cytokines released.
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We are grateful to M.V.C. Pragnell, B.A., a professional text editor, who revised and edited for English language the manuscript.
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Margherita Sisto and Sabrina Lisi have equal contribution in this work and both are equally considered as “first author”.
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Sisto, M., Lisi, S., D’Amore, M. et al. The metalloproteinase ADAM17 and the epidermal growth factor receptor (EGFR) signaling drive the inflammatory epithelial response in Sjögren’s syndrome. Clin Exp Med 15, 215–225 (2015). https://doi.org/10.1007/s10238-014-0279-4
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DOI: https://doi.org/10.1007/s10238-014-0279-4