Conventional dendritic cells impair recovery after myocardial infarction

Jun Seong Lee, Se Jin Jeong, Sinai Kim, Lorraine Chalifour, Tae Jin Yun, Mohammad Alam Miah, Bin Li, Abdelilah Majdoubi, Antoine Sabourin, Tibor Keler, Jean V. Guimond, Elie Haddad, Eui Young Choi, Slava Epelman, Jae Hoon Choi, Jacques Thibodeau, Goo Taeg Oh, Cheolho Cheong

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Ischemic myocardial injury results in sterile cardiac inflammation that leads to tissue repair, two processes controlled by mononuclear phagocytes. Despite global burden of cardiovascular diseases, we do not understand the functional contribution to pathogenesis of specific cardiac mononuclear phagocyte lineages, in particular dendritic cells. To address this limitation, we used detailed lineage tracing and genetic studies to identify bona fide murine and human CD103+ conventional dendritic cell (cDC)1s, CD11b+ cDC2s, and plasmacytoid DCs (pDCs) in the heart of normal mice and immunocompromised NSG mice reconstituted with human CD34+ cells, respectively. After myocardial infarction (MI), the specific depletion of cDCs, but not pDCs, improved cardiac function and prevented adverse cardiac remodeling. Our results showed that fractional shortening measured after MI was not influenced by the absence of pDCs. Interestingly, however, depletion of cDCs significantly improved reduction in fractional shortening. Moreover, fibrosis and cell areas were reduced in infarcted zones. This correlated with reduced numbers of cardiac macrophages, neutrophils, and T cells, indicating a blunted inflammatory response. Accordingly, mRNA levels of proinflammatory cytokines IL-1β and IFN-γ were reduced. Collectively, our results demonstrate the unequivocal pathological role of cDCs following MI.

Original languageEnglish
Pages (from-to)1784-1798
Number of pages15
JournalJournal of Immunology
Volume201
Issue number6
DOIs
StatePublished - 15 Sep 2018

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