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Published on: September 30, 2016
Kindlin-2 inhibited the growth and migration of colorectal cancer cells
Yuanyuan Ren1, Hongsong Jin, Zhidong Xue
1Department of Oncology, The People's Hospital of Taizhou, Taizhou, Jiangsu Province, China.
Abstract:
Activation of Wingless (Wnt)/beta-catenin signaling is a hallmark of colorectal carcinoma (CRC). It is very important to find out the molecular mechanism for the hyperactivation of Wnt/beta-catenin signaling and identify novel therapeutic targets. Kindlin-2, a regulator of integrins, recently has been found to be involved in the tumorigenesis. However, its expression profile and functions in the progression of CRC remain poorly understood. Here, we found that the expression of Kindlin-2 was downregulated in the CRC tissues. Moreover, overexpression of Kindlin-2 in CRC cells and normal colon epithelial cells inhibited cell proliferation and migration, while downregulation of Kindlin-2 promoted the tumorigenecity of CRC cells in vitro and in vivo. Mechanistically, Kindlin-2 decreased the phosphorylation of Ser9 in glycogen synthase kinase (GSK) 3beta and promoted the ubiquitination of beta-catenin. Taken together, our study suggests the suppressive roles of Kindlin-2 in the pathogenesis of CRC.
Insights
Kindlin-2 suppresses colorectal carcinoma (CRC) by inhibiting cell proliferation and migration. Lower Kindlin-2 levels promote CRC tumor growth, highlighting its therapeutic potential.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Wingless (Wnt)/beta-catenin signaling hyperactivation is a key feature of colorectal carcinoma (CRC).
- Understanding the molecular mechanisms driving Wnt/beta-catenin activation and identifying new therapeutic targets are crucial for CRC treatment.
- Kindlin-2, an integrin regulator, has emerging roles in tumorigenesis, but its specific function in CRC progression is unclear.
Purpose of the Study:
- To investigate the expression profile and functional role of Kindlin-2 in colorectal carcinoma.
- To elucidate the molecular mechanisms by which Kindlin-2 influences CRC cell behavior and tumorigenesis.
Main Methods:
- Analysis of Kindlin-2 expression in CRC tissues and cells.
- In vitro studies involving overexpression and downregulation of Kindlin-2 in CRC and normal colon epithelial cells to assess cell proliferation and migration.
- In vivo tumorigenicity assays in a preclinical model.
- Western blot analysis to examine the phosphorylation of glycogen synthase kinase 3beta (GSK3beta) and ubiquitination of beta-catenin.
Main Results:
- Kindlin-2 expression was found to be downregulated in CRC tissues.
- Overexpression of Kindlin-2 inhibited proliferation and migration of CRC and normal colon epithelial cells.
- Downregulation of Kindlin-2 enhanced the tumorigenicity of CRC cells both in vitro and in vivo.
- Mechanistically, Kindlin-2 was shown to decrease GSK3beta phosphorylation at Ser9 and promote beta-catenin ubiquitination.
Conclusions:
- Kindlin-2 acts as a tumor suppressor in the context of colorectal carcinoma.
- Kindlin-2 negatively regulates Wnt/beta-catenin signaling by modulating GSK3beta and beta-catenin.
- Kindlin-2 represents a potential therapeutic target for colorectal cancer treatment.
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