Treg-mediated suppression of atherosclerosis requires MYD88 signaling in DCs

Manikandan Subramanian*, Edward Thorp, Goran K. Hansson, Ira Tabas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

TLR activation on CD11c+ DCs triggers DC maturation, which is critical for T cell activation. Given the expansion of CD11c+ DCs during the progression of atherosclerosis and the key role of T cell activation in atherogenesis, we sought to understand the role of TLR signaling in CD11c+ DCs in atherosclerosis. To this end, we used a mouse model in which a key TLR adaptor involved in DC maturation, MYD88, is deleted in CD11c+ DCs. We transplanted bone marrow containing Myd88-deficient CD11c+ DCs into Western diet-fed LDL receptor knockout mice and found that the transplanted mice had decreased activation of effector T cells in the periphery as well as decreased infiltration of both effector T cells and Tregs in atherosclerotic lesions. Surprisingly, the net effect was an increase in atherosclerotic lesion size due to an increase in the content of myeloid-derived inflammatory cells. The mechanism involves increased lesional monocyte recruitment associated with loss of Treg-mediated suppression of MCP-1. Thus, the dominant effect of MYD88 signaling in CD11c+ DCs in the setting of atherosclerosis is to promote the development of atheroprotective Tregs. In the absence of MYD88 signaling in CD11c+ DCs, the loss of this protective Treg response trumps the loss of proatherogenic T effector cell activation.

Original languageEnglish (US)
Pages (from-to)179-188
Number of pages10
JournalJournal of Clinical Investigation
Volume123
Issue number1
DOIs
StatePublished - Jan 2 2013

ASJC Scopus subject areas

  • Medicine(all)

Fingerprint Dive into the research topics of 'Treg-mediated suppression of atherosclerosis requires MYD88 signaling in DCs'. Together they form a unique fingerprint.

Cite this