Bone marrow stromal proteoglycans regulate megakaryocytic differentiation of human progenitor cellsZweegman, S., Van Den Born, J., Mus, A. M. C., Kessler, F. L., Janssen, J. J. W. M., Netelenbos, T., Huijgens, P. C. & Dräger, A. M., 2004, In : Experimental Cell Research. 299, 2, p. 383-392 10 p.
Research output: Contribution to journal › Article › Academic › peer-review
Adherence of hematopoietic progenitor cells (HPCs) to stroma is an important regulatory step in megakaryocytic differentiation. However, the mechanisms through which megakaryocytic progenitors are inhibited by stroma are poorly understood. We examined the role of sulfated glycoconjugates, such as proteoglycans (PGs), on human bone marrow stroma (hBMS). To this end, PG structure was altered by desulfation or enzymatic cleavage. PGs participated in adhesion of human HPC, as desulfation resulted in about 50% decline in adhesion to hBMS. Heparan sulfate proteoglycans (HSPGs) were found to be responsible by showing about 25% decline in adhesion after pre-incubation of HPC with heparin and about 15% decline in adhesion after enzymatic removal of HSPGs from hBMS. Furthermore, PGs were involved in binding cytokines. Both desulfation and enzymatic removal of stromal HSPGs increased release of megakaryocytopoiesis-inhibiting cytokines, that is, interleukin-8 (IL-8, 1.9-fold increase) and macrophage inflammatory protein-1alpha (MIP-1alpha, 1.4-fold increase). The megakaryocytic output of HPC grown in conditioned medium of desulfated stroma was decreased to 50% of the megakaryocytic output in CM of sulfated stroma. From these studies, it can be concluded that PGs in bone marrow, in particular HSPGs, are involved in binding HPC and megakaryocytopoiesis-inhibiting cytokines. Bone marrow stromal PGs thus reduce differentiation of HPC toward megakaryocytes.
|Number of pages||10|
|Journal||Experimental Cell Research|
|Publication status||Published - 2004|
- Acute Disease, Antigens, CD34/metabolism, Blood Proteins/pharmacology, Bone Marrow/pathology, Cell Adhesion/drug effects, Cell Differentiation, Cells, Cultured, Chemokine CCL3, Chemokine CCL4, Culture Media, Conditioned, Eosinophil Major Basic Protein, Hematopoietic Stem Cells/cytology, Heparitin Sulfate/metabolism, Humans, Interleukin-8/pharmacology, Leukemia, Myeloid/metabolism, Lymphoma, Non-Hodgkin/metabolism, Macrophage Inflammatory Proteins/pharmacology, Megakaryocytes/cytology, Proteoglycans/pharmacology, Stromal Cells/cytology