Abstract
Enolase-α (ENO-1) is a key glycolytic enzyme that has been used as a diagnostic marker to identify human lung cancers. To investigate the role of ENO-1 in breast cancer diagnosis and therapy, the mRNA levels of ENO-1 in 244 tumor and normal paired tissue samples and 20 laser capture-microdissected cell clusters were examined by quantitative real-time PCR analysis. Increased ENO-1 mRNA expression was preferentially detected in estrogen receptor-positive (ER+) tumors (tumor/normal ratio >90-fold) when compared to ER-negative (tumor/normal ratio >20-fold) tumor tissues. The data presented here demonstrate that those patients whose tumors highly expressed ENO-1 had a poor prognosis with greater tumor size (>2 cm, *P = .017), poor nodal status (N > 3, *P = .018), and a shorter disease-free interval (≦1 year, *P < .009). We also found that higher-expressing ENO-1 tumors confer longer distance relapse (tumor/normal ratio = 82.8–92.4-fold) when compared to locoregional relapse (tumor/normal ratio = 43.4-fold) in postsurgical 4-hydroxy-tamoxifen (4-OHT)-treated ER+ patients (*P = .014). These data imply that changes in tumor ENO-1 levels are related to clinical 4-OHT therapeutic outcome. In vitro studies demonstrated that decreasing ENO-1 expression using small interfering RNA (siRNA) significantly augmented 4-OHT (100 nM)-induced cytotoxicity in tamoxifen-resistant (Tam-R) breast cancer cells. These results suggest that downregulation of ENO-1 could be utilized as a novel pharmacological approach for overcoming 4-OHT resistance in breast cancer therapy.
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Abbreviations
- ChIP:
-
Chromatin immunoprecipitation
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DMSO:
-
Dimethylsulfoxide
- E:
-
Estrogens
- DOX:
-
Doxorubicin
- ENO-1:
-
Enolase α
- ENO-2:
-
Enolase β
- ENO-3:
-
Enolase γ
- ER:
-
Estrogen receptor
- FACS:
-
Fluorescence-activated cell sorter
- FAS:
-
Fetal calf serum
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GF:
-
Griseofulvin
- GUS:
-
β-Glucuronidase
- IHC:
-
Immunohistochemistry
- LCM:
-
Laser capture microdissection
- MBP-1:
-
c-Myc promoter-binding protein
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium
- NFκB:
-
Nuclear factor kappa B
- 4-OHT:
-
4-Hydroxytamoxifen
- PBS:
-
Phosphate-buffered saline
- PDTC:
-
Pyrrolidine dithiocarbamate
- PR:
-
Progesterone receptor
- PTX:
-
Paclitaxel
- RT-PCR:
-
Reverse transcriptase polymerase chain reaction
- siRNA:
-
Small interfering RNA
- TBP:
-
TATA-box-binding protein
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Acknowledgments
This study was supported by the National Science Council, grant NSC 95-2320-B-038-016-MY3 for Dr. Ho, and NSC 96-2314-B-038-002 for Dr. Wu, and by the Cathay Medical Center (95CGH-TMU-09 and 96CGH-TMU-05).
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10549_2009_492_MOESM1_ESM.tif
Fig. S1 RT-PCR analyses for ENO-1 in human breast carcinoma tissues. mRNA expression levels for ENO-1 and GUS were detected as specific single bands (403 and 165 bp, respectively) in both tumor and adjacent normal tissues. PCR was performed for 35 cycles. One hundred cases are represented in this agarose gel image (TIFF 3,564 kb)
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Tu, SH., Chang, CC., Chen, CS. et al. Increased expression of enolase α in human breast cancer confers tamoxifen resistance in human breast cancer cells. Breast Cancer Res Treat 121, 539–553 (2010). https://doi.org/10.1007/s10549-009-0492-0
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DOI: https://doi.org/10.1007/s10549-009-0492-0