Apr 14, 2020

Apoptotic cells induce CD103 expression and immunoregulatory function in myeloid dendritic cell precursors through integrin αv and TGF-β activation

BioRxiv : the Preprint Server for Biology
A. ZhangJohn Savill

Abstract

In the mammalian gut CD103+ve myeloid DCs are known to suppress inflammation threatened by luminal bacteria, but stimuli driving DC precursor differentiation towards this beneficial phenotype are incompletely understood. We isolated CD11+ve DCs from mesenteric lymph nodes (MLNs) of healthy mice; CD103+ve DCs were 8-24 folds more likely than CD103-ve DCs to exhibit extensive of prior phagocytosis of apoptotic intestinal epithelial cells. However, CD103+ve and CD103-ve MLN DCs exhibited similar ex vivo capacity to ingest apoptotic cells, indicating that apoptotic cells might drive immature DC differentiation towards the CD103+ve phenotype. When cultured with apoptotic cells, myeloid DC precursors isolated from murine bone marrow and characterised as lineage-ve CD103-ve, displayed enhanced expression of CD103 and {beta}8 integrin and acquired increased capacity to induce Tregs after 7d in vitro. However, DC precursors isolated from v -tie2 mice lacking v integrins in the myeloid line exhibited reduced binding of apoptotic cells and complete deficiency in the capacity of apoptotic cells and/or latent TGF-{beta}1 to enhance CD103 expression in culture, whereas active TGF-{beta}1 increased DC precursor CD103 expression irrespective...Continue Reading

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