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. 1975 May;148(2):209–217. doi: 10.1042/bj1480209

The isolation and properties of granulocytic colony-stimulating activities from medium conditioned by human peripheral leucocytes.

G B Price, J S Senn, E A McCulloch, J E Till
PMCID: PMC1165528  PMID: 1156403

Abstract

The colony-stimulating activity detected by its ability to promote colony formation by human granulopoietic progenitor cells was partially purified from medium conditioned by human peripheral leucocytes. The purification procedure utilized (NH4)2SO4 precipitation, DEAE-cellulose chromatography, hydroxyapatite chromatography and gel filtration on Sephadex G-150 and yielded a purification of about 1000-fold. The medium from cultures of non-leukaemic cells contained three molecular species of colony-stimulating activity with approximate molecular weights of 93000, 36500 and 14700. On the basis of their sensitivity to enzymes, these species of activity appeared to be proteins. In contrast, medium from cultures of leukaemic cells contained only one detectable molecular species with colony-stimulating activity, usually with an approximate molecular weight of 36500. The results are discussed in relation to concurrent studies on the association of the different species of colony-stimulating activity with the cell surface membrane.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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