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. 1982 Oct;38(1):67–73. doi: 10.1128/iai.38.1.67-73.1982

Physicochemical characterization of cytostatic factors released from human monocytes.

J Nissen-Meyer, J Hammerstrøm
PMCID: PMC347698  PMID: 7141697

Abstract

Cultured human monocytes released cytostatic activity upon in vitro activation with lymphokines and lipopolysaccharide. This activity was mainly due to the presence of two different cytostatic factors, termed CstF I and II, which were separated by ion-exchange chromatography. At neutral pH, CstF I bound to the weak anion exchanger DEAE-Sephacel but not to the weak cation exchanger CM-Sepharose, whereas CstF II bound to CM-Sepharose but not to DEAE-Sephacel. The molecular weights of CstF I and II as determined by gel filtration were 55,000 and 40,000, respectively. Upon chromatofocusing, CstF I behaved as if it had an isoelectric point of 5.3. Neither CstF I nor CstF II bound specifically to concanavalin A-Sepharose, indicating the absence of carbohydrate residues containing alpha-D-mannopyranosyl, alpha-D-glucopyranosyl, or sterically related components. Both factors were susceptible to inactivation by proteinase K, demonstrating their protein nature. CstF II was purified more than 3,000-fold upon chromatography on CM-Sepharose and Sephacryl S-200. Ion-exchange chromatography and chromatofocusing of CstF I removed 97% of the proteins in the monocyte supernatant, but only 15% of the activity was recovered, resulting in a fivefold purification of CstF I.

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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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