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Myosin Vb as a tumor suppressor gene in intestinal cancer

Abstract

Colorectal cancer causes >900,000 deaths every year and a deeper understanding of the molecular mechanisms underlying this disease will contribute to improve its clinical management and survival. Myosin Vb (MYO5B) regulates intracellular vesicle trafficking, and inactivation of this myosin disrupts the polarization and differentiation of intestinal epithelial cells causing microvillous inclusion disease (MVID), a rare congenital disorder characterized by intractable life-threatening diarrhea. Here, we show that the loss Myosin Vb interfered with the differentiation/polarization of colorectal cancer cells. Although modulation of Myosin Vb expression did not affect the proliferation of colon cancer cells, MYO5B inactivation increased their migration, invasion, and metastatic potential. Moreover, Myo5b inactivation in an intestine-specific knockout mouse model caused a >15-fold increase in the number of azoxymethane-initiated small intestinal tumors. Consistently, reduced expression of Myosin Vb in a cohort of 155 primary colorectal tumors was associated with shorter patient survival. In conclusion, we show here that loss of Myosin Vb reduces polarization/differentiation of colon cancer cells while enhancing their metastatic potential, demonstrating a tumor suppressor function for this myosin. Moreover, reduced expression of Myosin Vb in primary tumors identifies a subset of poor prognosis colorectal cancer patients that could benefit from more aggressive therapeutic regimens.

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Fig. 1: Role of Myosin Vb on the differentiation and polarization of colon cancer cells.
Fig. 2: Myosin Vb regulates the metastatic potential of colon cancer cells.
Fig. 3: Loss of Myosin Vb enhances the proliferation of normal intestinal epithelial cells.
Fig. 4: Myosin Vb does not regulate the growth of colon cancer cells.
Fig. 5: Myo5b inactivation enhances intestinal tumorigenesis in a mouse model.
Fig. 6: Low levels of Myosin Vb are associated with poor patient prognosis.

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Funding

This study was partially funded by grants of World Cancer Research (AICR13-0245), Instituto de Salud Carlos III (PI16/00540, PI19/00993, PI22/00773), the European Regional Development Fund (AC15/00066, AC19/00095, AC20/00022) and the Spanish Association Against Cancer (AECC GCA15152966ARAN) to DA. BB is supported by “Ajuts per a la Iniciació de la Recerca” fellowship from Diputació de Lleida- Biomedical Research Institute of Lleida.

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Study concept and design: DA, FC-G, AM-B. Acquisition of data: FC-G, BB, EA, HD, JT, RN, EG-V, IM, ZZ, MD, MS-M, SCDvI, SL, JH-L, SS, XM-G, SRC, AM-B. Analysis and interpretation of data: DA, FC-G, AM-B. Drafting of the manuscript: DA, FC-G, BB, AM-B.

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Correspondence to Diego Arango.

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Cartón-García, F., Brotons, B., Anguita, E. et al. Myosin Vb as a tumor suppressor gene in intestinal cancer. Oncogene 41, 5279–5288 (2022). https://doi.org/10.1038/s41388-022-02508-2

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