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. 1987 Mar 15;242(3):779–787. doi: 10.1042/bj2420779

Purification and partial characterization of a tumour-metastasis-associated high-Mr glycoprotein from rat 13762NF mammary adenocarcinoma cells.

P A Steck, S M North, G L Nicolson
PMCID: PMC1147778  PMID: 3593275

Abstract

The expression of a high-Mr sialogalactoprotein (gp580) on rat 13762NF mammary adenocarcinoma cells was identified and correlated with spontaneous metastatic potential to colonize lung [Steck & Nicolson (1983) Exp. Cell Res. 147, 255-267]. Using a highly metastatic tumour-cell clone, MTLn3, we isolated and characterized gp580 from cells growing in vitro and in vivo in the mammary fat-pads of Fischer 344 rats. The glycoprotein was extracted with 4 M-guanidinium chloride/4% Zwittergent 3-12 solution in the presence of proteinase inhibitors. The extracts were then subjected to dissociative CsCl-density-gradient centrifugation, gel filtration on Sepharose CL-2B columns and ion-exchange chromatography on DEAE-Sephacel. The isolated glycoprotein possessed low electrophoretic mobility in SDS/polyacrylamide gels, and after desialylation bound 125I-labelled peanut agglutinin. Electrophoresis of gp580 in polyacrylamide-gradient gels resulted in a diffuse but homogeneous migrating band of Mr approx. 55,000. After removal of carbohydrate, gp580 was demonstrated to have a protein core of Mr approx. 150,000. The gp580 had a high density (1.430 g/ml) on isopycnic centrifugation in 4 M-guanidinium chloride and was resistant to most proteinases and other degradative enzymes, suggesting a mucin-like structure. Amino acid and carbohydrate analyses revealed that gp580 has high contents of serine, threonine, glutamic acid, aspartic acid, glucosamine and galactosamine; several acidic and neutral oligosaccharides were obtained from alkaline-borohydride digests. Cellular localization studies suggested that gp580 is associated mainly with the cell-surface and extracellular-matrix fractions of MTLn3 cells.

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Selected References

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