Tissue localization of TGFα and apoptosis are inversely related in colorectal tumors

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Abstract
Expression of TGFα and the EGF receptor was studied in relation to apoptosis in human colorectal mucosa and premalignant and malignant tumors. In normal mucosa the proteins colocalized both in the proliferation compartment and at the luminal pole of the crypts in cells committed to undergo apoptosis. While staining for the EGF receptor was increased in premalignant and malignant lesions, TGFα was undetectable in aberrant crypt foci as well as large areas of adenomas. Incidence of apoptosis (AI) was high in these areas ranging from 8.83–24.59. Adenomas did, however, contain islands of high TGFα expression where AI was decreased to a range of 0.76–4.00 (decreased at P=0.0027). In carcinomas TGFα expression was increased above both normal and adenoma levels corresponding to the decrease in apoptosis in the malignant tumors. Tissue localization of TGFα and AI were still inversely related (P=0.022), but interpatient variability was much larger than for adenomas. The data indicate that TGFα is the main survival factor in premalignant tumor cells of the colon, while additional factors moderate its effect in carcinomas. This suggests the possibility of targeting the EGF receptor pathway not only for treatment but also for the reversal of adenoma growth and the prevention of malignant colorectal tumors.

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