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Abstract
The effects of specific antibodies against growth factors and receptors on deoxyribonucleic acid (DNA) synthesis in two established human glioma cell lines, A172 and TM-1, were examined. Anti-platelet-derived growth factor (PDGF), anti-basic fibroblast growth factor (bFGF), and anti-epidermal growth factor receptor (EGF-R) antibodies inhibited thymidine incorporation by both cell lines in serum-free medium. Antibody specific to transforming growth factor-alpha only slightly suppressed DNA synthesis by both cell lines. Although the antiproliferative effects of anti-PDGF and anti-bFGF antibodies decreased in serum-supplemented medium, the effect of anti-EGF-R antibody was little changed. The combination of anti-PDGF, anti-bFGF, and anti-EGF-R antibodies significantly inhibited thymidine incorporation by the two cell lines even in serum-supplemented medium. This preliminary study suggests that simultaneous blockade of multiple autocrine loops may provide a new approach to the treatment of human malignant gliomas.
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