Abstract:
:The effects of three purified colony-stimulating factors (CSFs) with different specificities for the granulocyte (G) and macrophage (M) lineages (G-CSF, CSF-1 and GM-CSF) were studied in a serum-free clonal assay system. The results were compared with those obtained in similar cultures containing fetal calf serum (FCS). Total clone (greater than or equal to 10 cells) and colony (greater than or equal to 50 cells) numbers were enhanced by FCS under most conditions. However, the extent of enhancement was highly dependent on the concentration and type of CSF. In some instances, FCS also altered the proportions of G, M, and mixed GM clones induced by the CSFs. In cultures stimulated with GM-CSF, enhancement by FCS was significant only at low CSF concentrations, primarily due to increased numbers of M clones. In contrast, clonal growth was increased by FCS only at high concentrations of CSF-1. Clone and colony numbers induced by G-CSF were greatly increased in cultures with FCS at all CSF concentrations tested. Virtually all clones developing in serum-free medium with G-CSF were pure G, whereas, M and GM clones were usually present in serum-containing cultures with high doses of G-CSF. The effects of hydrocortisone (HC) were also examined in these experiments. Like modulation by FCS, modulation of clonal growth by HC depended on the CSF used as stimulus, having no effect in cultures with G-CSF, inhibitory effects with CSF-1, and variable effects with GM-CSF related to CSF concentration.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Eliason JFdoi
10.1002/jcp.1041280214subject
Has Abstractpub_date
1986-08-01 00:00:00pages
231-8issue
2eissn
0021-9541issn
1097-4652journal_volume
128pub_type
杂志文章abstract::Extracellular glutathione (GSH) is degraded by an external cell-surface enzyme, gamma-glutamyltranspeptidase (gamma-GT). The products are transported into cells to participate in important cellular processes. In the present study, we tested the hypothesis that extracellular GSH is a source of glutamic acid for cells t...
journal_title:Journal of cellular physiology
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journal_title:Journal of cellular physiology
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