Connective tissue growth factor gene expression alters tumor progression in esophageal cancer

World Journal of Surgery
Alexander KoliopanosMarkus W Büchler

Abstract

The ability of cancer cells to initiate specific fibroblast reactions may subsequently determine tumor evolution. In the present study we examined the coordinated expression of transforming growth factor-beta-1 (TGF-beta1), its signaling receptors, and its downstream mediator-connective tissue growth factor (CTGF)--and their impact on tumor progression and fibrogenesis in esophageal carcinomas. Messenger ribonucleic acid (mRNA) expression of TGF-beta1, CTGF, TGF-beta receptor subtype I ALK5 (TbetaR-IALK5), and TGF-beta receptor type II (TbetaR-II) was studied by Northern blot analysis in esophageal cancer and the normal esophagus. By means of immunohistochemistry and Western blot analysis, the respective proteins were localized in the tissue samples and the protein content was quantitated. Northern blot analysis revealed 3-fold and 4-fold increases (p < 0.05) in TGF-beta1 and CTGF mRNA levels, respectively, in esophageal cancer in comparison with normal controls, whereas TbetaR-I mRNA levels were significantly decreased and TbetaR-II mRNA levels were unchanged in the cancer samples. Immunostaining revealed results similar to those seen on the RNA level. TGF-beta1 and CTGF immunoreactivity were increased, TbetaR-II was unchanged...Continue Reading

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