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. 1990 Jul;62(1):28–32. doi: 10.1038/bjc.1990.223

Purification and characterisation of soluble tumour haemolytic factor isolated from oncogene transformed fibroblasts.

S Zucker 1, J Wieman 1, R M Lysik 1, B Imhof 1, A A Farooqui 1
PMCID: PMC1971718  PMID: 2202421

Abstract

Numerous studies have shown that intact cancer cells and cell extracts have the capacity to lyse erythrocytes in vitro. The transformation of NIH-3T3 fibroblasts by ras oncogenes has recently been demonstrated to result in tumour cells releasing a haemolytic factor. The purpose of this study has been to purify and further characterise the soluble tumour haemolytic factor (sTHF) produced by mouse fibroblasts transformed by T24 human bladder cancer DNA and by the cloned Harvey murine sarcoma viral oncogene. To this end, transformed fibroblasts were cultivated in serum-free medium. The cell-free supernatant was treated with ammonium sulphate and the precipitate achieved at 60-100% saturation was dialysed and applied to a gel filtration column. A haemolytic factor was eluted with an Mr between 65,000 and 75,000. Zinc chelate and strong anion exchange column chromatography resulted in greater than 3,000-fold enrichment of sTHF. SDS-PAGE of sTHF resulted in a single protein band of 66,000 Da. Soluble THF had no immunological cross-reactivity with known cytokines produced by lymphocytes and macrophages. The pathophysiological role of sTHF in cancer remains to be determined.

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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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