Abstract:
:Insulin-like growth factor-I receptor (IGF-IR) is an important mediator of tumor cell survival and shows prognostic significance in sarcoma. To explore potential therapeutic strategies for interrupting signaling through this pathway, we assessed the ability of cyclolignan picropodophyllin (PPP), a member of the cyclolignan family, to selectively inhibit the receptor tyrosine kinase activity of IGF-IR in several sarcoma cell line model systems. Of the diverse sarcoma subtypes studied, osteosarcoma cell lines were found to be particularly sensitive to IGF-IR inhibition, including several multidrug resistant osteosarcoma cell lines with documented resistance to various conventional anticancer drugs. PPP shows relatively little toxicity in human osteoblast cell lines when compared with osteosarcoma cell lines. These studies show that PPP significantly inhibits IGF-IR expression and activation in both chemotherapy-sensitive and chemotherapy-resistant osteosarcoma cell lines. This inhibition of the IGF-IR pathway correlates with suppression of proliferation of osteosarcoma cell lines and with apoptosis induction as measured by monitoring of poly(ADP-ribose) polymerase and its cleavage product and by quantitative measurement of apoptosis-associated CK18Asp396. Importantly, PPP increases the cytotoxic effects of doxorubicin in doxorubicin-resistant osteosarcoma cell lines U-2OS(MR) and KHOS(MR). Furthermore, small interfering RNA down-regulation of IGF-IR expression in drug-resistant cell lines also caused resensitization to doxorubicin. Our data suggest that inhibition of IGF-IR with PPP offers a novel and selective therapeutic strategy for ostosarcoma, and at the same time, PPP is effective at reversing the drug-resistant phenotype in osteosarcoma cell lines.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Duan Z,Choy E,Harmon D,Yang C,Ryu K,Schwab J,Mankin H,Hornicek FJdoi
10.1158/1535-7163.MCT-09-0115subject
Has Abstractpub_date
2009-08-01 00:00:00pages
2122-30issue
8eissn
1535-7163issn
1538-8514pii
1535-7163.MCT-09-0115journal_volume
8pub_type
杂志文章abstract::The majority of patients with HER2-overexpressing metastatic breast cancer who initially respond to the HER2-targeted antibody trastuzumab show disease progression within 1 year. The identification of novel agents that effectively inhibit survival of cancer cells that have progressed on trastuzumab is critical for imp...
journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-08-0012
更新日期:2008-07-01 00:00:00
abstract::Multiple myeloma is characterized by the malignant proliferating antibody-producing plasma cells in the bone marrow. Despite recent advances in therapy that improve the survival of patients, multiple myeloma remains incurable and therapy resistance is the major factor causing lethality. Clearly, more effective treatme...
journal_title:Molecular cancer therapeutics
pub_type: 杂志文章,评审
doi:10.1158/1535-7163.MCT-12-0782
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abstract::Sorafenib is a second-generation, orally active multikinase inhibitor that is approved for the treatment of patients with advanced renal cell carcinoma and patients with unresectable hepatocellular carcinoma. We studied active transport of sorafenib in MDCK-II cells expressing human P-glycoprotein (P-gp/ABCB1) or ABCG...
journal_title:Molecular cancer therapeutics
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pub_type: 杂志文章
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章,评审
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更新日期:2006-12-01 00:00:00
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更新日期:2014-11-01 00:00:00
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pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-11-0006
更新日期:2011-10-01 00:00:00
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pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-08-1029
更新日期:2009-07-01 00:00:00
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-08-1080
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-11-0521
更新日期:2012-04-01 00:00:00
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pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-05-0126
更新日期:2006-01-01 00:00:00
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
doi:10.1158/1535-7163.MCT-07-2026
更新日期:2008-04-01 00:00:00
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doi:10.1158/1535-7163.MCT-17-0442
更新日期:2018-01-01 00:00:00
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
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更新日期:2014-10-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
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更新日期:2020-08-01 00:00:00
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journal_title:Molecular cancer therapeutics
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journal_title:Molecular cancer therapeutics
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章
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