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- W2914902570 abstract "576 Background: KRAS mutation ( KRAS mut ) is associated with aggressive biological behavior and resistance to chemoradiotherapy in colorectal cancer (CRC). The tumor microenvironment is a critical component framing the biological behavior of cancers. We have recently shown that a KRAS mut modulates the tumor microenvironment by reducing the expression of extracellular matrix (ECM) genes in CRC. The effect of a KRAS mut on integrins, the epithelial cell receptors for ECM proteins, remains largely unknown. Here, we investigated the impact of KRAS mut on integrin expression in CRC and the effect of integrin beta 4 (ITGB4) expression on CRC phenotype. Methods: The genomic profile of 79 locally advanced rectal cancers (LARC) was characterized by the MSK-IMPACT DNA assay and RNA sequencing by Hi-Seq platform. The transcriptomic changes associated with KRAS in the LARC cohort was validated in the TCGA colon cancer dataset. Expression of ITGB4 was investigated by immunofluorescence (IF) in 39 colon cancer specimens by counting ITGB4-positive cells in an E-cadherin positive epithelial population. The relationship between KRAS and ITGB4 was also explored by manipulating KRAS expression in human cell lines and genetically engineered mouse models (GEMMs). ITGB4 knockout in HCT116 CRC cell lines and organoids from GEMMs were generated with CRISPR/Cas9. ITGB4 expression was confirmed using qRT-PCR and western blotting. Cell proliferation was assessed with the MTT assay. Cell invasion and migration were assessed in a trans-well system. Results: ITGB4 gene expression was increased in KRAS mut compared to KRAS wildtype in LARC and TCGA. Increased ITGB4 expression in KRAS mut colon cancers was also validated by IF (p = 0.0029). Introduction of KRAS mut in HCT116 CRCs and GEMMs increased ITGB4 expression by 1.5 to 2 fold. Knockout of ITGB4 reduced the migration and invasion of HCT116 CRC cells but did not alter proliferation. Conclusions: KRAS mut increases the expression of ITGB4 in CRC. Increased ITGB4 expression is associated with CRC cell invasion and migration. These results inform the biology of tumor progression in KRAS mut CRC tumors." @default.
- W2914902570 created "2019-02-21" @default.
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- W2914902570 date "2019-02-01" @default.
- W2914902570 modified "2023-10-18" @default.
- W2914902570 title "KRAS mutation is associated with upregulation of integrin beta-4 expression leading to tumor invasion in colorectal cancer." @default.
- W2914902570 doi "https://doi.org/10.1200/jco.2019.37.4_suppl.576" @default.
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