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Blood, Vol. 95 No. 1 (January 1), 2000: pp. 128-137

Distinct signals control the hematopoiesis of lymphoid-related dendritic cells

Anne Galy, Indu Christopherson, Guido Ferlazzo, Guo Liu, Hergen Spits, and Katia Georgopoulos

From the Barbara Ann Karmanos Cancer Institute, Wayne State University, Detroit, MI; Netherlands Cancer Institute, Amsterdam, The Netherlands; Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Charlestown, MA.

The molecular and cellular requirements for the development of different populations of human dendritic cells (DC) were studied. Conditions were defined that support DC production from lymphoid progenitors but that fail to induce DC formation from peripheral monocytes. The production of these lymphoid-related DC was severely blocked when hematopoietic progenitors overexpressed Ik7, a mutant dominant-negative Ikaros protein. In contrast, Ik7 did not block the formation of DC in conditions supporting the development of monocyte-derived DC. Furthermore, Ik7 did not block the formation of monocyte/macrophages and enhanced granulopoiesis. One of the molecular mechanisms mediated by Ik7 appears to be down-regulation of the flt3-receptor mRNA. Thus, distinct signals control the formation of DC demonstrating that some aspects of DC diversity are determined in part by distinct molecular cues at the hematopoietic level. (Blood. 2000;95:128-137)


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