Application of Proteoglycan Extracted from the Nasal Cartilage of Salmon Heads for Ex Vivo Expansion of Hematopoietic Progenitor Cells Derived from Human Umbilical Cord Blood
Overview
Endocrinology
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Highly purified proteoglycan (PG) extracted from the nasal cartilage of salmon heads was applied to the ex vivo expansion of hematopoietic progenitor cells prepared from human umbilical cord blood in serum-free cultures supplemented with the combination of early-acting cytokines, thrombopoietin (TPO), interleukin-3 (IL-3) and stem cell factor (SCF). PG showed no promoting effects on the cell proliferation rate; however, they promoted the generation of progenitor cells for granulocyte-macrophages, erythrocytes and/or megakaryocytes in culture with TPO alone or SCF plus TPO. However, no promoting effect was observed in a combination of IL-3 plus SCF, which showed the highest cell proliferation rate. PG failed to promote the generation of mixed colony-forming units (i.e. the relatively immature cells in hematopoiesis). These results suggest that PG acts on the relatively mature stem/progenitor cells, and may function as a regulatory factor in the differentiation pathway of hematopoiesis.
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