Membrane-associated RING-CH protein (MARCH8) is a novel glycolysis repressor targeted by miR-32 in colorectal cancer

• Published in: Journal of translational medicine Vol. 20; no. 1; pp. 1 - 13
• Main Authors: Wang, Zhan, Wang, Miao-Miao, Geng, Yan, Ye, Chen-Yang, Zang, Yuan-Sheng
• Format: Journal Article
• Language: English
• Published: London BioMed Central Ltd 05.09.2022; BioMed Central; BMC
• Subjects: Antibodies; Antigens; Biomarkers; Breast cancer; Cancer; Cancer therapies; Care and treatment; Cell culture; Chromatin; Cloning; Colorectal cancer; Colorectal carcinoma; Gene silencing; Glycolysis; Health aspects; Hexokinase; HK2; Medical prognosis; Membrane proteins; Membrane-associated RING-CH protein 8 (MARCH8); Membranes; Metabolism; Metastasis; MicroRNA; miR-32; Packaging; Patients; Plasmids; Proteasomes; Proteins; Risk factors; Survival analysis; Tumor proteins; Tumors; Ubiquitin; Ubiquitin-protein ligase; Ubiquitination; Xenografts; China; United States > US
• ISSN: 1479-5876; 1479-5876
• DOI: 10.1186/s12967-022-03608-z

Background Colorectal cancer (CRC) is the third most common cancer and leading cause of cancer-related deaths worldwide. Aberrant cellular metabolism is a hallmark of cancer cells, and disturbed metabolism showed clinical significance in CRC. The membrane-associated RING-CH 8 (MARCH8) protein, the first MARCH E3 ligase, plays an oncogenic role and serves as a prognostic marker in multiple cancers, however, the role of MARCH8 in CRC is unclear. In the present study, we aimed to investigate the biomarkers and their underlying mechanism for CRC. Method In this study, we first examined the function of MARCH8 in CRC by analysing public database. Besides, we performing gene silencing studies and generating cellular overexpression and xenograft models. Then its protein substrate was identified and validated. In addition, the expression of MARCH8 was investigated in tissue samples from CRC patients, and the molecular basis for decreased expression was analysed. Results Systematic analysis reveals that MARCH8 is a beneficial prognostic marker in CRC. In CRC, MARCH8 exhibited tumor-suppressive activity both in vivo and in vitro. Furthermore, we found that MARCH8 is negatively correlated with hexokinase 2 (HK2) protein in CRC patients. MARCH8 regulates glycolysis and promotes ubiquitination-mediated proteasome degradation to reduces HK2 protein levels. Then HK2 inhibitor partially rescues the effect of MARCH8 knockdown in CRC. Poised chromatin and elevated miR-32 repressed MARCH8 expression. Conclusion In summary, we propose that in CRC, poised chromatin and miR-32 decrease the expression of MARCH8, further bind and add ubiquitin, induce HK2 degradation, and finally repress glycolysis to promote tumor suppressors in CRC. Keywords: Colorectal cancer, Membrane-associated RING-CH protein 8 (MARCH8), Glycolysis, HK2, miR-32