Open AccessAnatomical Compartments Modify the Response of Human Hematopoietic Cells to a Mitogenic Signal
Author(s) -
Nagasawa Yasuo,
Wood Brent L.,
Wang Linlin,
Lintmaer Ingrid,
Guo Wenjin,
Papayannopoulou Thalia,
Harkey Michael A.,
Nourigat Cynthia,
Blau C. Anthony
Publication year - 2006
Publication title -
stem cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.159
H-Index - 229
eISSN - 1549-4918
pISSN - 1066-5099
DOI - 10.1634/stemcells.2005-0484
Subject(s) - biology , haematopoiesis , progenitor cell , bone marrow , spleen , microbiology and biotechnology , stem cell , cord blood , cd34 , immunology
Methods for specifically regulating transplanted cells have many applications in gene and cell therapy. We examined the response of human cord blood CD34 + cells to a specific mitotic signal in vivo. Using a conditional signaling molecule (F36VMpl) that is specifically activated by an artificial ligand called a chemical inducer of dimerization (CID), human hematopoietic cells transplanted into immune deficient mice were induced to proliferate. Only differentiating erythroid precursors and multipotential and erythroid progenitors (colony‐forming unit [CFU]‐mix and burst forming unitserythroid [BFUe]) responded; however, the nature of the response differed markedly between bone marrow and spleen. In the marrow, F36VMpl induced a 12‐ to 17‐fold expansion of differentiated erythroid precursors and a loss of CFU‐mix and BFUe. In the spleen, F36VMpl induced a marked rise in BFUe and CFU‐mix and, relative to marrow, a much less prominent rise in more mature red cells. Clonal analysis was most consistent with the interpretation that the spleen and bone marrow differentially regulate the response of human progenitors to a mitotic signal, possibly influencing progenitor expansion versus differentiation. These findings establish CIDs as in vivo growth factors for human hematopoietic cells.