[Insulin-like growth factor receptor, hepatocyte-derived growth factor receptor and telomerase expression in ulcerative colitis].
BACKGROUND
The risk of colorectal carcinoma development is elevated in chronic, longstanding ulcerative colitis. The changes of such regenerative and immortalizing pathways caused by the inflammatory process that are proved to be carcinogenic in other human tissues have not been fully and uniformly described. Aim of the study was to describe the expression alterations of regenerative signal receptors and cell aging inhibitory systems within colonic crypts considering the histological activity of the disease.


METHODS
I-type insulin-like growth factor receptor (IGF1R), hepatocyte derived growth factor receptor (HGFR), telomerase reverse transcriptase (TERT) and telomerase associated protein (TP-1) expression were evaluated immunohistochemically on formalin fixed paraffin embedded biopsy specimen from 10 mild, 10 moderate, and 10 severe active inflammation of ulcerative colitis and from 10 normal colonic tissue.


RESULTS
In mild inflammation all observed parameter showed significantly elevated protein expression in protein level compared to normal (p <0.005). In moderately active inflammation only IGF1R expression was significantly higher compared to normal and to mild inflammation (p <0.005). There were no regenerative signal expression alteration in severe inflammation compared to normal, and epithelial telomerase expression was not detectable in these cases.


CONCLUSIONS
The expression of regenerative signal receptors and immortalizing factors is elevated in mildly (and moderately) inflamed ulcerative colitis. This phenomenon let the genetically defected epithelial cells to pathologically survive and proliferate, so thus favours the development of tumors.
Sipos
Ferenc
F
Semmelweis Egyetem, Altalános Orvostudományi Kar, II Belgyógyászati Klinika, Magyar Tudományos Akadémia, Budapest.
Molnár
Béla
B
Zágoni
Tamás
T
Miheller
Pál
P
Tulassay
Zsolt
Z
D000328:Adult; D015415:Biomarkers / Q000378:metabolism; D002352:Carrier Proteins / Q000378:metabolism; D002471:Cell Transformation, Neoplastic / Q000378:metabolism; D003093:Colitis, Ulcerative / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D019859:Proto-Oncogene Proteins c-met / Q000378:metabolism*; D016601:RNA-Binding Proteins; D017526:Receptor, IGF Type 1 / Q000378:metabolism*; D019098:Telomerase / Q000378:metabolism*
D015415:Biomarkers; D002352:Carrier Proteins; D016601:RNA-Binding Proteins; C104342:TEP1 protein, human; D019859:Proto-Oncogene Proteins c-met; D017526:Receptor, IGF Type 1; C509186:TERT protein, human; D019098:Telomerase