title: The effect of DLE fractions on GM-progenitors of haematopoietic stem cells in vitro.
abstract: Dialysable leucocyte extract (DLE) prepared from buffy coats of human blood, potentiates the effect of Colony-stimulating factor (CSF) on the growth of granulocyte-macrophage colony forming cell (GM-CFC) colonies in vitro. This relative increase of the number of colonies is apparent when diluted CSF (present in lung conditioning medium) as a control, and DLE, in a wide range of concentrations are added to the culture of mouse bone marrow cells. Fractionation of DLE on Amicon membranes revealed that the activity resides in molecules of 0-5 kD. Molecules 5-10 kD have no potentiating effect. DLE and its fractions (0-5 kD, 0-1 kD), except fractions 0-500 D and 5-10 kD, when added undiluted i.e. at the initial concentration, exerted a suppressive effect: colonies are not formed despite the presence of CSF. In a pilot experiment, it was shown that DLE is able to stimulate colony-forming activity of earlier progenitors of erythroid cells (BFUe), under the influence of erythropoietin.
authors.affiliation: SEVAC a.s., Praha, Czech Republic.
authors.forename: K
authors.initials: K
authors.lastname: Barnet
authors.forename: A
authors.initials: A
authors.lastname: Vacek
authors.forename: K
authors.initials: K
authors.lastname: Cech
authors.forename: J
authors.initials: J
authors.lastname: Pekárek
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002457:Cell Extracts / Q000494:pharmacology*; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D003956:Dialysis; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D007962:Leukocytes / Q000737:chemistry / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008970:Molecular Weight; D014165:Transfer Factor / Q000494:pharmacology*
chemical_list: D002457:Cell Extracts; D003115:Colony-Stimulating Factors; D014165:Transfer Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor