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Erschienen in: International Journal of Colorectal Disease 11/2013

01.11.2013 | Original Article

Overexpression of Lgr5 correlates with resistance to 5-FU-based chemotherapy in colorectal cancer

verfasst von: Hung-Chih Hsu, Yi-Shiuan Liu, Kai-Chi Tseng, Cheng-Lung Hsu, Ying Liang, Tsai-Sheng Yang, Jinn-Shiun Chen, Rei-Ping Tang, Shu-Jen Chen, Hua-Chien Chen

Erschienen in: International Journal of Colorectal Disease | Ausgabe 11/2013

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Abstract

Background

The leucine-rich repeat-containing G protein-coupled receptor 5 (Lgr5) is an adult intestinal stem cell marker frequently detected in human colorectal cancers (CRCs). However, the value of Lgr5 level in CRC prognosis and treatment prediction has not been well characterized.

Methods

We examined Lgr5 expression in 384 formalin-fixed paraffin-embedded CRC specimens from 296 CRC patients, including 64 patients treated with 5-fluorouracil (5-FU)-based chemotherapy. The effects of Lgr5 on cell proliferation, survival, and drug resistance were examined in cultured CRC cells.

Results

Elevated expression of Lgr5 was observed in CRC tissues, and Lgr5 protein levels were significantly correlated with an advanced American Joint Committee on Cancer stage (P < 0.001), T stage (P < 0.001), N stage (P < 0.001), and distant metastasis (P < 0.001). High expression levels of Lgr5 were significantly associated with shorter disease-free survival (P < 0.001) and shorter cancer-specific survival (P = 0.007) in CRC patients. Among the chemotherapy-treated subgroups, patients with low Lgr5 level showed a better response rate (65 %) than patients with high Lgr5 level (37 %) towards 5-FU-based treatment (P = 0.025). In cultured CRC cell lines, knocking down Lgr5 suppressed cell proliferation and colony formation ability, while it enhanced apoptosis and rendered cells more sensitive to chemotherapeutic agents. In contrast, overexpression of Lgr5 increased cell proliferation and enhanced chemoresistance.

Conclusion

These results suggest that elevated Lgr5 level is associated with CRC progression and treatment response and has the potential to serve as a therapeutic target in CRC patients.
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Metadaten
Titel
Overexpression of Lgr5 correlates with resistance to 5-FU-based chemotherapy in colorectal cancer
verfasst von
Hung-Chih Hsu
Yi-Shiuan Liu
Kai-Chi Tseng
Cheng-Lung Hsu
Ying Liang
Tsai-Sheng Yang
Jinn-Shiun Chen
Rei-Ping Tang
Shu-Jen Chen
Hua-Chien Chen
Publikationsdatum
01.11.2013
Verlag
Springer Berlin Heidelberg
Erschienen in
International Journal of Colorectal Disease / Ausgabe 11/2013
Print ISSN: 0179-1958
Elektronische ISSN: 1432-1262
DOI
https://doi.org/10.1007/s00384-013-1721-x

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