Expression of human glutathione S-transferase P1 mediates the chemosensitivity of osteosarcoma cells.

Abstract:

:Chemoresistance is a major reason that patients with osteosarcoma fail to achieve a lasting chemotherapy response, and it contributes to disease relapse, progression, and death. Human glutathione S-transferase P1 (GSTP1), a phase II detoxification enzyme, contributes to chemoresistance in many cancers. However, the role of GSTP1 in osteosarcoma chemoresistance is ill defined. We hypothesized that GSTP1 has cytoprotective effects in human osteosarcoma. To assess this possibility, we used GSTP1 cDNA transfection or RNA interference to overexpress or suppress GSTP1 in osteosarcoma cells, and assessed the cytotoxic effect of chemotherapeutic agents on these cells. Our results showed that GSTP1 expression was up-regulated in osteosarcoma cells when they were treated with doxorubicin or cisplatin. GSTP1 overexpression in SAOS-2 osteosarcoma cells caused the cells to be more resistant to doxorubicin and cisplatin. In contrast, GSTP1 suppression in HOS cells caused more apoptosis and extensive DNA damage in response to doxorubicin and cisplatin. The cytotoxicity assay also showed that GSTP1 suppression caused a 2.5-fold increase in cell growth inhibition resulting from doxorubicin and cisplatin treatments [the IC(50)s are approximately 0.16 micromol/L (doxorubicin) and 1.8 micromol/L (cisplatin) for parental HOS versus 0.06 micromol/L (doxorubicin) and 0.75 micromol/L (cisplatin) for GSTP1-silenced HOS]. Moreover, GSTP1 suppression decreased the activation of extracellular signal-regulated kinase 1/2, which is induced by cisplatin and doxorubicin. Taken together, these findings show that GSTP1 contributes to doxorubicin and cisplatin resistance in osteosarcoma, which may be mediated in part by the activation of extracellular signal-regulated kinase 1/2. Targeting of GSTP1 combined with chemotherapy may have synergistic therapeutic effects on osteosarcoma.

journal_name

Mol Cancer Ther

authors

Huang G,Mills L,Worth LL

doi

10.1158/1535-7163.MCT-06-0580

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

1610-9

issue

5

eissn

1535-7163

issn

1538-8514

pii

6/5/1610

journal_volume

6

pub_type

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