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Published on: July 22, 2020
KLHL5 Contributes to Colorectal Cancer Cell Survival by Promoting Cell Cycle Progression and Suppressing Apoptotic
Kyosuke Habu1,2, Yosuke Matsuoka3, Hiromi Hiyoshi4
1Department of Biochemistry and Molecular Genetics, Ehime University Graduate School of Medicine, Toon, Japan.
Kelch-like protein 5 (KLHL5) promotes colorectal cancer (CRC) cell survival by enhancing cell cycle progression and preventing apoptosis. KLHL5 depletion halts CRC cell growth and triggers programmed cell death, indicating its role as a survival factor.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Kelch-like protein 5 (KLHL5) is overexpressed in colorectal cancer (CRC) and correlates with advanced stages and poor prognosis.
- The precise function of KLHL5 in CRC malignant progression remains undetermined.
Purpose of the Study:
- To investigate the functional role of KLHL5 in colorectal cancer progression.
- To elucidate the molecular mechanisms by which KLHL5 influences CRC cell behavior.
Main Methods:
- Characterization of human CRC cell lines (HCT116, SW480) with KLHL5 depletion.
- Assessment of cell growth, migration, and cell death (apoptosis).
- Proteomic analysis and biochemical assays to identify affected cellular pathways and proteins.
Main Results:
- KLHL5 depletion significantly suppressed CRC cell growth and migration.
- Apoptotic cell death was induced, marked by altered expression of Bcl-2 family proteins (Bcl-2, Bax, Bok, Puma, Bid, Noxa, Bik).
- KLHL5 depletion disrupted cell cycle progression by inhibiting G1/S transition and activating G2/M DNA damage pathways, downregulating key replication (CDT1, CDC6) and cell cycle (cyclins A, B) proteins.
Conclusions:
- KLHL5 acts as a crucial survival factor in colorectal cancer.
- KLHL5 supports cell cycle progression and confers resistance to apoptosis, aiding tumor survival in challenging microenvironments.
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