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Vol. 14, Issue 5, 1790-1800, May 2003
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Stimulates the Epithelial-to-Mesenchymal Transition of Human Colonic Organoids
Division of Cancer Biology and Angiogenesis, Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215
Submitted September 10, 2002;
Revised November 20, 2002;
Accepted January 7, 2003
Monitoring Editor: Mary Beckerle
An epithelial-mesenchymal transition (EMT) characterizes the progression of many carcinomas and it is linked to the acquisition of an invasive phenotype. Given that the tumor microenvironment is an active participant in tumor progression, an important issue is whether a reactive stroma can modulate this process. Using a novel EMT model of colon carcinoma spheroids, we demonstrate that their transforming-growth factor-
1 (TGF-)-induced EMT is accelerated dramatically by the presence of activated macrophages, and we identify tumor necrosis factor-
(TNF-) as the critical factor produced by macrophages that accelerates the EMT. A synergy of TNF- and TGF- signaling promotes a rapid morphological conversion of the highly organized colonic epithelium to dispersed cells with a mesenchymal phenotype, and this process is dependent on enhanced p38 MAPK activity. Moreover, exposure to TNF- stimulates a rapid burst of ERK activation that results in the autocrine production of this cytokine by the tumor cells themselves. These results establish a novel role for the stroma in influencing EMT in colon carcinoma, and they identify a selective advantage to the stromal presence of infiltrating leukocytes in regulating malignant tumor progression.
Corresponding author. E-mail address: rbates{at}caregroup.harvard.edu.
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