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Robert J. Coffey, MD
Division of Gastroenterology, Hepatology and Nutrition
Vanderbilt-Ingram Cancer Center
Nashville, Tennessee, United States
The focus of research within the Coffey lab is the study of the role of the EGF receptor (EGFR) and its ligands in GI neoplasia. The lab has a particular interest in the trafficking of EGFR ligands in polarizing colonic epithelial cells. Naked2 has been identified as a critical regulator of basolateral trafficking of TGF-alpha, a major EGFR ligand. Naked2 is a known antagonist of Wnt-beta-catenin signaling so Naked2 provides a point of convergence between EGFR and Wnt signaling. This work has led to the identification of a new mode of EGFR ligand signaling via exosomes and the development of FAVS (fluorescent-activated vesicle sorting) to isolate and characterize cellular organelles. The lab has recently found that Lrig1, an inducible negative regulator of the EGFR, marks proliferative and quiescent intestinal stem cells, and acts as a tumor suppressor.
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