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Published on: May 17, 2013
TrpC5 regulates differentiation through the Ca2+/Wnt5a signalling pathway in colorectal cancer
Zhen Chen1, Chunlei Tang1, Yaodan Zhu1
1School of Pharmaceutical Sciences, Jiangnan University, Wuxi, China.
Abstract:
Transient receptor potential channel 5 (TrpC5) is a member of the TrpC subgroup, and it forms a receptor-activated, non-selective Ca2+ channel. The architecture of the TrpC5 channel is poorly understood. In the present study, we report that TrpC5 is a key factor in regulating differentiation in colorectal cancer (CRC). Through a study of specimens from a large cohort of patients with CRC, we found that TrpC5 was highly expressed and its cellular level correlated with tumour grade. We showed further that up-regulated TrpC5 caused a robust rise in intracellular calcium concentration [Ca2+]i, increased Wnt5a expression and the nuclear translocation of β-catenin, leading to a reduction in cancer differentiation and an increase in cancer cell stemness. Notably, patients with tumours that expressed high levels of TrpC5 showed significantly poorer disease-free and overall survival. Therefore, our findings suggest that TrpC5 is an independent adverse prognostic factor for death in CRC, reducing differentiation through the Ca2+/Wnt5a signalling pathway.
Insights
Transient receptor potential channel 5 (TrpC5) is a key factor in colorectal cancer (CRC) progression. High TrpC5 expression correlates with poor survival, indicating its role as an adverse prognostic factor in CRC.
Area of Science:
- Molecular Biology
- Oncology
- Cell Biology
Background:
- Transient receptor potential channel 5 (TrpC5) forms a non-selective Ca2+ channel.
- The structural and functional aspects of TrpC5 in cancer remain largely uncharacterized.
Purpose of the Study:
- To investigate the role of TrpC5 in colorectal cancer (CRC) differentiation and prognosis.
- To elucidate the molecular mechanisms by which TrpC5 influences CRC progression.
Main Methods:
- Analysis of TrpC5 expression in a large cohort of CRC patient specimens.
- Assessment of intracellular calcium levels ([Ca2+]i), Wnt5a expression, and beta-catenin translocation.
- Correlation of TrpC5 levels with tumor grade and patient survival data.
Main Results:
- TrpC5 was highly expressed in CRC tissues, with expression levels correlating with tumor grade.
- Upregulated TrpC5 increased [Ca2+]i, Wnt5a expression, and beta-catenin nuclear translocation.
- Elevated TrpC5 expression was associated with reduced cancer differentiation, increased stemness, and poorer patient survival.
Conclusions:
- TrpC5 is a critical regulator of differentiation in colorectal cancer.
- The Ca2+/Wnt5a signaling pathway mediated by TrpC5 contributes to CRC progression and reduced differentiation.
- TrpC5 serves as an independent adverse prognostic factor for survival in CRC patients.
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