Kim JK, Marco MR, Choi S, Qu X, Chen C, Elkabets M, Fairchild L, Chow O, Barriga FM, Dow LE, O’Rourke K, Szeglin B, Yarilin D, Fujisawa S, Manova‐Todorova K, Paty PB, Shia J, Leslie C, Joshua Smith J, Lowe S, Pelossof R, Sanchez‐Vega F, Garcia‐Aguilar J. KRAS mutant rectal cancer cells interact with surrounding fibroblasts to deplete the extracellular matrix.
Mol Oncol 2021;
15:2766-2781. [PMID:
33817986 PMCID:
PMC8486594 DOI:
10.1002/1878-0261.12960]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 03/29/2021] [Accepted: 04/01/2021] [Indexed: 02/05/2023] Open
Abstract
Somatic mutations in the KRAS oncogene are associated with poor outcomes in locally advanced rectal cancer but the underlying biologic mechanisms are not fully understood. We profiled mRNA in 76 locally advanced rectal adenocarcinomas from patients that were enrolled in a prospective clinical trial and investigated differences in gene expression between KRAS mutant (KRAS-mt) and KRAS-wild-type (KRAS-wt) patients. We found that KRAS-mt tumors display lower expression of genes related to the tumor stroma and remodeling of the extracellular matrix. We validated our findings using samples from The Cancer Genome Atlas (TCGA) and also by performing immunohistochemistry (IHC) and immunofluorescence (IF) in orthogonal cohorts. Using in vitro and in vivo models, we show that oncogenic KRAS signaling within the epithelial cancer cells modulates the activity of the surrounding fibroblasts in the tumor microenvironment.
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