Tucker MA, Gillespie GY. Production of a bioactive high molecular weight transforming growth factor beta-like molecule by human malignant glioma cell lines.
Growth Factors 1994;
11:153-62. [PMID:
7857659 DOI:
10.3109/08977199409001057]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The present study describes identification and partial characterization of a glioma-derived high molecular weight transforming growth factor beta-like molecule (HMW-TGF beta) that requires no activation for biological activity. HMW-TGF beta, constitutively produced by the human glioma cell line, D54MG, is not acid- or heat-labile; is relatively resistant to denaturation, reduction, and high salt treatment. Monoclonal antibody 12A12.D7, produced against partially-purified HMW-TGF beta, was used both to deplete and to neutralize directly a > 158 kDa HMW-TGF beta activity from gel filtration fractions; the antibody also directly neutralized purified mature TGF beta 1. 12A12.D7 recognized a single protein species of 186 kDa from unlabeled glioma cell conditioned media and 35S-labeled lysates. HMW-TGF beta is not due to complex formation between TGF beta and any of the known carrier molecules. Production of HMW-TGF beta by glioma cells could facilitate tumor cell proliferation, and thus contribute to the inexorable and rapid progression that characterizes malignant gliomas.
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