TLR agonists promote ERK-mediated preferential IL-10 production of regulatory dendritic cells (diffDCs), leading to NK-cell activation.

Abstract:

:Regulatory dendritic cells (DCs) play an important role in maintaining peripheral tolerance or immune homeostasis. Our previous study demonstrated that mature DCs could be driven by splenic stroma to proliferate and differentiate into a novel subset of regulatory DCs (diffDCs) displaying a Th2-biased cytokine profile. However, the underlying mechanisms for the unique cytokine profile of diffDCs and how diffDCs regulate the innate and adaptive immunity in response to toll-like receptor (TLR) agonists remain unclear. Here, we report that unlike immature DCs, diffDCs secrete more interleukin 10 (IL-10) but little IL-12p70 in response to lipopolysaccharide (LPS) or other TLR agonists. Up-regulation of extracellular signal-regulated kinase (ERK1/2) activation was shown to be responsible for IL-10 preferential production, and suppression of p38 activation was for impaired IL-12p70 production in diffDCs. Interestingly, LPS treatment could not reverse the inhibitory effect of diffDCs on the proliferation of antigen-specific CD4+ T cells. However, diffDCs could activate natural killer (NK) cells through diffDC-derived IL-10, and even more markedly after stimulation of TLR agonists. These diffDC-activated NK cells could in turn kill surrounding diffDCs. Our results illuminate signal pathways for the unique cytokine profile of diffDCs, and diffDCs can exert their regulatory function even after inflammatory stimuli, thus reflecting one way for strict regulation of immune response.

journal_name

Blood

journal_title

Blood

authors

Qian C,Jiang X,An H,Yu Y,Guo Z,Liu S,Xu H,Cao X

doi

10.1182/blood-2006-03-005595

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

2307-15

issue

7

eissn

0006-4971

issn

1528-0020

pii

blood-2006-03-005595

journal_volume

108

pub_type

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