Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 13, Pages 4044-4049Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1417620112
Keywords
apoptosis; dendritic cells; BH3-mimetic
Categories
Funding
- National Health and Medical Research Council (NHMRC) Australia [1037321, 1016701, 1016647, 637324, 1007703, 1043414, 104610, 1020363, 1024620, 1080321]
- Juvenile Diabetes Research Foundation
- Rebecca L. Cooper Foundation
- Leukemia and Lymphoma Society Special Center of Research Grant [700113]
- NHMRC Independent Research Institutes Infrastructure Support Scheme [361646]
- Victorian State Government Operational Infrastructure Support
- Australian government
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Dendritic cells (DCs) are heterogeneous, comprising subsets with functional specializations that play distinct roles in immunity as well as immunopathology. We investigated the molecular control of cell survival of two main DC subsets: plasmacytoid DCs (pDCs) and conventional DCs (cDCs) and their dependence on individual antiapoptotic BCL-2 family members. Compared with cDCs, pDCs had higher expression of BCL-2, lower A1, and similar levels of MCL-1 and BCL-XL. Transgenic overexpression of BCL-2 increased the pDC pool size in vivo with only minor impact on cDCs. With a view to immune intervention, we tested BCL-2 inhibitors and found that ABT-199 (the BCL-2 specific inhibitor) selectively killed pDCs but not cDCs. Conversely, genetic knockdown of A1 profoundly reduced the proportion of cDCs but not pDCs. We also found that conditional ablation of MCL-1 significantly reduced the size of both DC populations in mice and impeded DC-mediated immune responses. Thus, we revealed that the two DC types have different cell survival requirements. The molecular basis of survival of different DC subsets thus advocates the antagonism of selective BCL-2 family members for treating diseases pertaining to distinct DC subsets.
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