Chronic Inflammation Enhances NGF-β/TrkA System Expression Via EGFR/MEK/ERK Pathway Activation in Sjögren's Syndrome

Overview

Journal J Mol Med (Berl)

Specialty General Medicine

Date 2014 Feb 22

PMID 24557415

Citations 9

Authors

Sabrina Lisi

Margherita Sisto

Domenico Ribatti

Massimo DAmore

Raffella De Lucro

Maria Antonia Frassanito

Loredana Lorusso

Angelo Vacca

Dario Domenico Lofrumento

Affiliations

Soon will be listed here.

Abstract

Unlabelled: Primary Sjögren's syndrome (pSS) is a chronic autoimmune exocrine disease associated with variable lymphocytic infiltration of the affected organs (primarily salivary and lachrymal glands). To investigate the potential implication of nerve growth factor-β (NGF-β) and its high affinity receptor tyrosine kinase receptor A (TrkA) in the regulation of pSS inflammatory responses, we studied their expression in the human salivary gland epithelial cells (SGEC) cultures from pSS minor salivary glands (MSG) biopsies and their relationship with histopathological disease parameters. Here, we demonstrated an increased expression of the NGF-β/TrkA system in pSS SGEC, correlated with the MSG inflammation grade. The results demonstrate that the pro-inflammatory cytokines TNF-α and IL-6 enhance NGF-β production; on the contrary, NGF-β production was reduced in the presence of both Raf-1 kinase and MEK inhibitors. Furthermore, TNF-α/IL-6 treatment increased ERK1/2 phosphorylation. Inhibition of the EGF/EGFR system also decreased NGF-β release by pSS SGEC, indicating that the chronic inflammatory condition characteristic of pSS enhances NGF-β production via EGFR/Raf-1/MEK/ERK pathway activation.

Key Message: NGF-β and TrkA expression is elevated in salivary gland epithelial cells of primary Sjögren's syndrome (pSS). Overexpression of NGF-β/TrkA system in pSS occurs via EGFR/Raf-1/MEK/ERK pathway. In pSS, NGF-β overexpression was prevented by EGFR/Raf-1/MEK/ERK pathway inhibition.

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