Isolation of the tissue factor inhibitor produced by HepG2 hepatoma cells

G. J. Broze, J. P. Miletich

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Progressive inhibition of tissue factor activity occurs upon its addition to human plasma (serum). This process requires the presence of factor VII(a), factor X(a), Ca2+, and another component in plasma that we have called the tissue factor inhibitor (TFI). A TFI secreted by HepG2 cells (human hepatoma cell line) was isolated from serum-free conditioned medium in a four-step procedure including CdCl2 precipitation, diisopropylphosphoryl-factor X(a) affinity chromatography, Sephadex G-75 superfine gel filtration, and Mono Q ion-exchange chromatography. The purified TFI contained a predominant band at M(r) 38,000 on NaDodSO4/polyacrylamide gel electrophoresis that comigrates with inhibitory activity. Like the activity present in plasma, this TFI requires the presence of factor VII(a), factor X(a), and Ca2+ to express inhibitory activity. Its specific activity (assuming an extinction coefficient of 10 at 280 nM, for a 1-cm path length through a 1% solution) was 9800 units/mg of protein, where 1 unit of TFI activity was defined as that present in 1 ml of normal pooled serum.

Original languageEnglish
Pages (from-to)1886-1890
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume84
Issue number7
DOIs
StatePublished - Jan 1 1987

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