Targeting DCLK1 overcomes 5‐fluorouracil resistance in colorectal cancer through inhibiting CCAR1/β‐catenin pathway‐mediated cancer stemness

• Published in: Clinical and translational medicine Vol. 12; no. 5; pp. e743 - n/a
• Main Authors: Wang, Lanqing, Zhao, Lei, Lin, Zhenyu, Yu, Dandan, Jin, Min, Zhou, Pengfei, Ren, Jinghua, Cheng, Jing, Yang, Kunyu, Wu, Gang, Zhang, Tao, Zhang, Dejun
• Format: Journal Article
• Language: English
• Published: United States John Wiley & Sons, Inc 01.05.2022; John Wiley and Sons Inc; Wiley
• Subjects: Apoptosis; Apoptosis Regulatory Proteins - therapeutic use; beta Catenin - genetics; beta Catenin - metabolism; cancer stemness; Cancer therapies; CCAR1; Cell Cycle; Cell Cycle Proteins - metabolism; Cell Cycle Proteins - therapeutic use; Cell Line, Tumor; chemoresistence; Chemotherapy; Clinical medicine; Colorectal cancer; Colorectal Neoplasms - drug therapy; Colorectal Neoplasms - genetics; Colorectal Neoplasms - metabolism; DCLK1; Doublecortin-Like Kinases - genetics; Fluorouracil - pharmacology; Humans; Intracellular Signaling Peptides and Proteins - genetics; Intracellular Signaling Peptides and Proteins - metabolism; Kinases; Metastasis; Neoplasm Recurrence, Local; Pancreatic cancer; Protein Serine-Threonine Kinases - genetics; Stem cells; Survival analysis; Tumors; Wnt Signaling Pathway; β‐catenin; β-catenin; colorectal cancer; chemoresistence; DCLK1; cancer stemness; CCAR1
• DOI: 10.1002/ctm2.743
• ISSN: 2001-1326

Background To date, 5‐fluorouracil‐based chemotherapy is very important for locally advanced or metastatic colorectal cancer (CRC). However, chemotherapy resistance results in tumor recurrence and metastasis, which is a major obstacle for treatment of CRC. Methods In the current research, we establish 5‐fluorouracil resistant cell lines and explore the potential targets associated with 5‐fluorouracil resistance in CRC. Moreover, we perform clinical specimen research, in vitro and in vivo experiments and molecular mechanism research, to reveal the biological effects and the mechanism of DCLK1 promoting 5‐fluorouracil resistance, and to clarify the potential clinical value of DCLK1 as a target of 5‐fluorouracil resistance in CRC. Results We discover that doublecortin‐like kinase 1 (DCLK1), a cancer stem cell maker, is correlated with 5‐fluorouracil resistance, and functionally promotes cancer stemness and 5‐fluorouracil resistance in CRC. Mechanistically, we elucidate that DCLK1 interacts with cell cycle and apoptosis regulator 1 (CCAR1) through the C‐terminal domain, and phosphorylates CCAR1 at the Ser343 site, which is essential for CCAR1 stabilisation. Moreover, we find that DCLK1 positively regulates β‐catenin signalling via CCAR1, which is responsible for maintaining cancer stemness. Subsequently, we prove that blocking β‐catenin inhibits DCLK1‐mediated 5‐fluorouracil resistance in CRC cells. Importantly, we demonstrate that DCLK1 inhibitor could block CCAR1/β‐catenin pathway‐mediated cancer stemness and consequently suppresses 5‐fluorouracil resistant CRC cells in vitro and in vivo. Conclusions Collectively, our findings reveal that DCLK1 promotes 5‐fluorouracil resistance in CRC by CCAR1/β‐catenin pathway‐mediated cancer stemness, and suggest that targeting DCLK1 might be a promising method to eliminate cancer stem cells for overcoming 5‐fluorouracil resistance in CRC. DCLK1, a cancer stem cell maker, is correlated with 5‐fluorouracil resistance. DCLK1 interacts with CCAR1 and phosphorylates CCAR1 at the Ser343 site, which is essential for CCAR1 stabilisation. DCLK1 promotes 5‐fluorouracil resistance by CCAR1/β‐catenin pathway‐mediated cancer stemness. Targeting DCLK1 might be a promising method to eliminate cancer stem cells for overcoming 5‐fluorouracil resistance in CRC.