Molecular profile and partial functional analysis of novel endothelial cell-derived growth factors that regulate hematopoiesis.
Recent progress has been made in the identification of the osteoblastic cellular niche for hematopoietic stem cells (HSCs) within the bone marrow (BM). Attempts to identify the soluble factors that regulate HSC self-renewal have been less successful. We have demonstrated that primary human brain endothelial cells (HUBECs) support the ex vivo amplification of primitive human BM and cord blood cells capable of repopulating non-obese diabetic/severe combined immunodeficient repopulating (SCID) mice (SCID repopulating cells [SRCs]). In this study, we sought to characterize the soluble hematopoietic activity produced by HUBECs and to identify the growth factors secreted by HUBECs that contribute to this HSC-supportive effect. Extended noncontact HUBEC cultures supported an eight-fold increase in SRCs when combined with thrombopoietin, stem cell factor, and Flt-3 ligand compared with input CD34(+) cells or cytokines alone. Gene expression analysis of HUBEC biological replicates identified 65 differentially expressed, nonredundant transcripts without annotated hematopoietic activity. Gene ontology studies of the HUBEC transcriptome revealed a high concentration of genes encoding extracellular proteins with cell-cell signaling function. Functional analyses demonstrated that adrenomedullin, a vasodilatory hormone, synergized with stem cell factor and Flt-3 ligand to induce the proliferation of primitive human CD34(+)CD38(-)lin(-) cells and promoted the expansion of CD34(+) progenitors in culture. These data demonstrate the potential of primary HUBECs as a reservoir for the discovery of novel secreted proteins that regulate human hematopoiesis.
Chute
John P
JP
Division of Cellular Therapy, Department of Internal Medicine, Duke University, Durham, North Carolina 27710, USA. john.chute@duke.edu
Muramoto
Garrett G
GG
Dressman
Holly K
HK
Wolfe
Gary
G
Chao
Nelson J
NJ
Lin
Simon
S
D053607:Adrenomedullin / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D000818:Animals; D018952:Antigens, CD34 / Q000096:biosynthesis; D001921:Brain / Q000098:blood supply / Q000166:cytology* / Q000378:metabolism; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology* / Q000378:metabolism; D016228:Endothelial Growth Factors / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D005312:Fetal Blood / Q000166:cytology / Q000378:metabolism; D015870:Gene Expression; D006410:Hematopoiesis / Q000502:physiology*; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D012995:Solubility; D014665:Vasodilator Agents / Q000378:metabolism / Q000494:pharmacology
D018952:Antigens, CD34; D016228:Endothelial Growth Factors; D014665:Vasodilator Agents; D053607:Adrenomedullin