Lack of functional retinoblastoma protein mediates increased resistance to antimetabolites in human sarcoma cell lines

Weiwei Li, Jianguo Fan, Daniel Hochhauser, Debabrata Banerjee, Zbigniew Zielinski, Alex Almasan, Yuxin Yin, Ruth Kelly, Geoffrey M. Wahl, Joseph Bertino

Research output: Contribution to journalArticle

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Abstract

Growth inhibition assays indicated that the IC50 values for methotrexate (MTX) and 5-fluorodeoxyuridine (FdUrd) in HS-18, a liposarcoma cell line lacking retinoblastoma protein (pRB), and SaOS-2, an osteosarcoma cell line with a truncated and nonfunctional pRB, were 10- to 12-fold and 4- to II- fold higher, respectively, than for the HT-1080 (fibrosarcoma) cell line, which has wild-type pRB. These Rb(-/-) cell lines exhibited a 2- to 4-fold increase in both dihydrofolate reductase (DHFR) and thymidylate synthase (TS) enzyme activities as well as a 3- to 4-fold increase in mRNA levels for these enzymes compared to the HT-1080 (Rb(+/+)) cells. This increase in expression was not due to amplification of the DHFR and TS genes. Growth inhibition by MTX and FdUrd was increased and DHFR and TS activities and expression were correspondingly decreased in Rb transfectants of SaOS-2 cells. In contrast, there was no significant difference in growth inhibition among these cell lines for the nonantimetabolites VP-16, cisplatin, and doxorubicin. A gel mobility-shift assay showed that parental SaOS-2 cells had increased levels of free E2F compared to the Rb-reconstituted NaOS-2 cells. These results indicate that pRB defective cells may have decreased sensitivity to growth inhibition by target enzymes encoded by genes whose transcription is enhanced by E2F proteins and suggest mechanisms of interaction between cytotoxic agents and genes involved in cell cycle progression.

Original languageEnglish (US)
Pages (from-to)10436-10440
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number22
DOIs
StatePublished - Oct 24 1995

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Antimetabolites
Retinoblastoma Protein
Sarcoma
Cell Line
Floxuridine
Growth
Methotrexate
Enzymes
E2F Transcription Factors
Genes
Liposarcoma
Fibrosarcoma
Cytotoxins
Electrophoretic Mobility Shift Assay
Etoposide
Osteosarcoma
Doxorubicin
Cisplatin
Inhibitory Concentration 50
Cell Cycle

All Science Journal Classification (ASJC) codes

  • General

Cite this

Li, Weiwei ; Fan, Jianguo ; Hochhauser, Daniel ; Banerjee, Debabrata ; Zielinski, Zbigniew ; Almasan, Alex ; Yin, Yuxin ; Kelly, Ruth ; Wahl, Geoffrey M. ; Bertino, Joseph. / Lack of functional retinoblastoma protein mediates increased resistance to antimetabolites in human sarcoma cell lines. In: Proceedings of the National Academy of Sciences of the United States of America. 1995 ; Vol. 92, No. 22. pp. 10436-10440.
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abstract = "Growth inhibition assays indicated that the IC50 values for methotrexate (MTX) and 5-fluorodeoxyuridine (FdUrd) in HS-18, a liposarcoma cell line lacking retinoblastoma protein (pRB), and SaOS-2, an osteosarcoma cell line with a truncated and nonfunctional pRB, were 10- to 12-fold and 4- to II- fold higher, respectively, than for the HT-1080 (fibrosarcoma) cell line, which has wild-type pRB. These Rb(-/-) cell lines exhibited a 2- to 4-fold increase in both dihydrofolate reductase (DHFR) and thymidylate synthase (TS) enzyme activities as well as a 3- to 4-fold increase in mRNA levels for these enzymes compared to the HT-1080 (Rb(+/+)) cells. This increase in expression was not due to amplification of the DHFR and TS genes. Growth inhibition by MTX and FdUrd was increased and DHFR and TS activities and expression were correspondingly decreased in Rb transfectants of SaOS-2 cells. In contrast, there was no significant difference in growth inhibition among these cell lines for the nonantimetabolites VP-16, cisplatin, and doxorubicin. A gel mobility-shift assay showed that parental SaOS-2 cells had increased levels of free E2F compared to the Rb-reconstituted NaOS-2 cells. These results indicate that pRB defective cells may have decreased sensitivity to growth inhibition by target enzymes encoded by genes whose transcription is enhanced by E2F proteins and suggest mechanisms of interaction between cytotoxic agents and genes involved in cell cycle progression.",
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Lack of functional retinoblastoma protein mediates increased resistance to antimetabolites in human sarcoma cell lines. / Li, Weiwei; Fan, Jianguo; Hochhauser, Daniel; Banerjee, Debabrata; Zielinski, Zbigniew; Almasan, Alex; Yin, Yuxin; Kelly, Ruth; Wahl, Geoffrey M.; Bertino, Joseph.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 92, No. 22, 24.10.1995, p. 10436-10440.

Research output: Contribution to journalArticle

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T1 - Lack of functional retinoblastoma protein mediates increased resistance to antimetabolites in human sarcoma cell lines

AU - Li, Weiwei

AU - Fan, Jianguo

AU - Hochhauser, Daniel

AU - Banerjee, Debabrata

AU - Zielinski, Zbigniew

AU - Almasan, Alex

AU - Yin, Yuxin

AU - Kelly, Ruth

AU - Wahl, Geoffrey M.

AU - Bertino, Joseph

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Y1 - 1995/10/24

N2 - Growth inhibition assays indicated that the IC50 values for methotrexate (MTX) and 5-fluorodeoxyuridine (FdUrd) in HS-18, a liposarcoma cell line lacking retinoblastoma protein (pRB), and SaOS-2, an osteosarcoma cell line with a truncated and nonfunctional pRB, were 10- to 12-fold and 4- to II- fold higher, respectively, than for the HT-1080 (fibrosarcoma) cell line, which has wild-type pRB. These Rb(-/-) cell lines exhibited a 2- to 4-fold increase in both dihydrofolate reductase (DHFR) and thymidylate synthase (TS) enzyme activities as well as a 3- to 4-fold increase in mRNA levels for these enzymes compared to the HT-1080 (Rb(+/+)) cells. This increase in expression was not due to amplification of the DHFR and TS genes. Growth inhibition by MTX and FdUrd was increased and DHFR and TS activities and expression were correspondingly decreased in Rb transfectants of SaOS-2 cells. In contrast, there was no significant difference in growth inhibition among these cell lines for the nonantimetabolites VP-16, cisplatin, and doxorubicin. A gel mobility-shift assay showed that parental SaOS-2 cells had increased levels of free E2F compared to the Rb-reconstituted NaOS-2 cells. These results indicate that pRB defective cells may have decreased sensitivity to growth inhibition by target enzymes encoded by genes whose transcription is enhanced by E2F proteins and suggest mechanisms of interaction between cytotoxic agents and genes involved in cell cycle progression.

AB - Growth inhibition assays indicated that the IC50 values for methotrexate (MTX) and 5-fluorodeoxyuridine (FdUrd) in HS-18, a liposarcoma cell line lacking retinoblastoma protein (pRB), and SaOS-2, an osteosarcoma cell line with a truncated and nonfunctional pRB, were 10- to 12-fold and 4- to II- fold higher, respectively, than for the HT-1080 (fibrosarcoma) cell line, which has wild-type pRB. These Rb(-/-) cell lines exhibited a 2- to 4-fold increase in both dihydrofolate reductase (DHFR) and thymidylate synthase (TS) enzyme activities as well as a 3- to 4-fold increase in mRNA levels for these enzymes compared to the HT-1080 (Rb(+/+)) cells. This increase in expression was not due to amplification of the DHFR and TS genes. Growth inhibition by MTX and FdUrd was increased and DHFR and TS activities and expression were correspondingly decreased in Rb transfectants of SaOS-2 cells. In contrast, there was no significant difference in growth inhibition among these cell lines for the nonantimetabolites VP-16, cisplatin, and doxorubicin. A gel mobility-shift assay showed that parental SaOS-2 cells had increased levels of free E2F compared to the Rb-reconstituted NaOS-2 cells. These results indicate that pRB defective cells may have decreased sensitivity to growth inhibition by target enzymes encoded by genes whose transcription is enhanced by E2F proteins and suggest mechanisms of interaction between cytotoxic agents and genes involved in cell cycle progression.

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