Intrinsic Resistance to Methotrexate in Human Soft Tissue Sarcoma Cell Lines

Wei Wei Li, James T. Lin, Barry I. Schweitzer, William P. Tong, Donna Niedzwiecki, Joseph R. Bertino

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


A human fibrosarcoma cell line, HT-1080, and four new cell lines (HS-16, HS-28, HS-30, and HS-42) were established from untreated patients with mesenchymal chondrosarcoma, peripheral nerve sheath sarcoma, malignant hemangiopericytoma, and mixed mesoderma! tu mor, respectively, and were used for analysis of mechanisms of intrinsic resistance to methotrexate. All four new cell lines were resistant to methotrexate as determined by inhibition of thymidylate synthase in whole cells and by growth inhibition, as compared with HT-1080, a methotrexate sensitive cell line. Methotrexate uptake, level of dihydrofolate reducãase, and inhibition of this enzyme by methotrexate in the four cell lines were comparable to HT-1080 cells. However, levels of long chain polyglutamates (glu3-5) of methotrexate achieved after a 24-h incubation with this drug were much lower in the four new cell lines as compared to the HT-1080 cell line (5- to 20-fold lower). The low levels of methotrexate polyglutamates formed is likely the major cause of intrinsic methotrexate resistance in these new sarcoma cell lines.

Original languageEnglish (US)
Pages (from-to)3908-3913
Number of pages6
JournalCancer Research
Issue number14
StatePublished - Jul 1992

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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