Dendritic cell depletion in burn patients is regulated by MafB expression Journal Article

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Authors: Williams, K. N.; Szilagyi, A.; He, L. K.; Conrad, P.; Halerz, M.; Gamelli, R. L.; Shankar, R.; Muthumalaiappan, K
Article Title: Dendritic cell depletion in burn patients is regulated by MafB expression
Abstract: Studies have shown that monocytes are hyporesponsive and that dendritic cells (DCs) are depleted in burn patients. We have recently shown in a mouse model that burn injury alters the transcriptional regulation in bone marrow progenitors and inhibits myeloid-derived DC (mDC) production. In the present study, using human burn patient peripheral blood mononuclear cells, we have shown an overexpression of MafB with a corresponding reduction in peripheral blood mononuclear cell-derived mDCs. We isolated mononuclear cells from burn patient (23-68% TBSA) and control volunteer peripheral blood samples by Ficoll gradient centrifugation and cultured mDCs by using a standard ex vivo culture system. Fluorescence-activated cell sorter analysis was used to select myeloid cells based on the cell surface expression of CD45+. The mDC fraction was identified by the expression of human leukocyte antigen (HLA)-DR+CD11c+, and we found a significant reduction in HLA-DR+ leukocytes for up to 4 weeks postburn. MafB expression was then examined in HLA-DR+CD14+ monocytes. Burn injury alters the phenotype of CD14+ monocytes augmenting MafB expression and reducing their differentiation into mDCs. MafB was then silenced in ex vivo culture prior to DC differentiation by using small interfering RNA technique. MafB gene silencing improved the differentiation potential of CD14+ cells into mDCs, increasing the percentage of mDCs by >75%. Furthermore, GATA-1+ and HLA-DR+ mDCs were increased following MafB silencing. Although burn injury augments the number of peripheral blood monocytes, the frequency of mDC is reduced. This impairment is likely secondary to the down-regulation of mDC differentiation by high MafB-expressing monocytes following burn injury.
Journal Title: Journal of burn care research : official publication of the American Burn Association
Volume: 33
Issue: 6
ISSN: 1559-0488; 1559-047X
Publisher: Unknown  
Journal Place: United States
Date Published: 2012
Start Page: 747
End Page: 758
Language: eng
DOI/URL:

10.1097/BCR.0b013e318250457f

10.1097/BCR.0b013e318250457f
Notes: JID: 101262774; 0 (Antigens, CD11c); 0 (Antigens, CD14); 0 (GATA1 Transcription Factor); 0 (GATA1 protein, human); 0 (HLA-DR Antigens); 0 (MafB Transcription Factor); 0 (RNA, Small Interfering); EC 3.1.3.48 (Antigens, CD45); EC 3.1.3.48 (PTPRC protein, human); ppublish