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Molecular and Cellular Biology logoLink to Molecular and Cellular Biology
. 1993 Dec;13(12):7203–7212. doi: 10.1128/mcb.13.12.7203

Dominant-negative mutants of platelet-derived growth factor revert the transformed phenotype of human astrocytoma cells.

S M Shamah 1, C D Stiles 1, A Guha 1
PMCID: PMC364790  PMID: 8246942

Abstract

Malignant astrocytoma is the most common primary human brain tumor. Most astrocytomas express a combination of platelet-derived growth factor (PDGF) and PDGF receptor which could close an autocrine loop. It is not known whether these autocrine loops contribute to the transformed phenotype of astrocytoma cells or are incidental to that phenotype. Here we show that dominant-negative mutants of the PDGF ligand break the autocrine loop and revert the phenotype of BALB/c 3T3 cells transformed by the PDGF-A or PDGF-B (c-sis) gene. Then, we show that these mutants are selective in that they do not alter the phenotype of 3T3 cells transformed by an activated Ha-ras or v-src gene or by simian virus 40. Finally, we show that these mutants revert the transformed phenotype of two independent human astrocytoma cell lines. They have no effect on the growth of human medulloblastoma, bladder carcinoma, or colon carcinoma cell lines. These observations are consistent with the view that PDGF autocrine loops contribute to the transformed phenotype of at least some human astrocytomas.

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Selected References

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