It remains generally accepted that colorectal cancer (CRC) results from the accumulation of genetic events within the epithelial compartment. Unresolved issues include (1) whether the order of these genetic events matter (e.g., APC vs KRAS), (2) whether cancers can initiate from multiple distinct cells of origin, (3) the relationship between the normal colonic stem cell and the cells that function to maintain the tumor and (4) the contribution of the local environment to the neoplastic process. We hypothesize that colonic tumor initiation and progression is highly dependent upon the origin of the cell that incurs the relevant mutagenic events, as well as the regulation of growth and clonal selection of particular progeny that emanate from tumor-initiating cells. We have demonstrated that there are distinct normal colonic progenitor populations marked by expression of two specific cell surface markers, Lrig1 and Lgr5. Although the precise relationship between cells expressing these two markers is unknown, these two bona fide stem cell markers exhibit overlapping, yet distinct, expression patterns in both normal colon and in ApcMin/+ tumors. Of note, Lrig1 is induced by EGFR signaling and acts to negatively regulate EGFR signaling, whereas Lgr5 is a canonical Wnt target of unknown function. We have generated inducible Lrig1-CreERT2 mice, and our collaborator Hans Clevers has provided us with inducible Lgr5-EGFP-IRES-CreERT2 animals that allow for the specific activation of Cre recombinase within distinct colonic stem cell populations. We will use these mice to determine the importance of cell-of-origin in colon cancer initiation and progression. In addition, we have identified a gene, Slc26a3, that is selectively expressed in the differentiated compartment of the colon, and we have generated Slc26a3-CreERT2 mice that will allow us to resolve whether colonic tumors arise from the """"""""top down"""""""" or """"""""bottom up.""""""""
The cell in the colon which gives rise to colorectal cancer is unknown. We have generated novel genetically engineered mice that will allow us to answer this question. These results may allow us to determine whether colon cancer stem cells exist and their relationship to normal colonic stem cells, leading to identification of the colon cancer cell-of-origin and the colon cancer stem cell and offering exciting new therapeutic options.
|Choi, Eunyoung; Lantz, Tyler L; Vlacich, Gregory et al. (2018) Lrig1+ gastric isthmal progenitor cells restore normal gastric lineage cells during damage recovery in adult mouse stomach. Gut 67:1595-1605|
|Li, Cunxi; Singh, Bhuminder; Graves-Deal, Ramona et al. (2017) Three-dimensional culture system identifies a new mode of cetuximab resistance and disease-relevant genes in colorectal cancer. Proc Natl Acad Sci U S A 114:E2852-E2861|
|McKinley, Eliot T; Sui, Yunxia; Al-Kofahi, Yousef et al. (2017) Optimized multiplex immunofluorescence single-cell analysis reveals tuft cell heterogeneity. JCI Insight 2:|
|Yang, Yu-Ping; Ma, Haiting; Starchenko, Alina et al. (2017) A Chimeric Egfr Protein Reporter Mouse Reveals Egfr Localization and Trafficking In Vivo. Cell Rep 19:1257-1267|
|Wang, Jing; Mouradov, Dmitri; Wang, Xiaojing et al. (2017) Colorectal Cancer Cell Line Proteomes Are Representative of Primary Tumors and Predict Drug Sensitivity. Gastroenterology 153:1082-1095|
|Huh, Won Jae; Coffey, Robert J; Washington, Mary Kay (2016) Ménétrier's Disease: Its Mimickers and Pathogenesis. J Pathol Transl Med 50:10-6|
|Yu, Huapeng H; Dohn, Michael R; Markham, Nicholas O et al. (2016) p120-catenin controls contractility along the vertical axis of epithelial lateral membranes. J Cell Sci 129:80-94|
|Simmons, Alan J; Scurrah, Cherié R; McKinley, Eliot T et al. (2016) Impaired coordination between signaling pathways is revealed in human colorectal cancer using single-cell mass cytometry of archival tissue blocks. Sci Signal 9:rs11|
|Gonzalez, Raul S; Cates, Justin M M; Washington, Mary Kay et al. (2016) Adenoma-like adenocarcinoma: a subtype of colorectal carcinoma with good prognosis, deceptive appearance on biopsy and frequent KRAS mutation. Histopathology 68:183-90|
|Singh, Bhuminder; Carpenter, Graham; Coffey, Robert J (2016) EGF receptor ligands: recent advances. F1000Res 5:|
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