Detection of tenascin-C isoforms in colorectal mucosa, ulcerative colitis, carcinomas and liver metastases.
The glycoprotein tenascin-C is up-regulated in inflammatory and neoplastic diseases. Most available data on tissue tenascin-C content do not distinguish its various isoforms. We have quantified tissue tenascin-C signals in colorectal mucosa, ulcerative colitis, colorectal carcinomas and liver metastases using 5 monoclonal antibodies (MAbs) with different binding sites. Tenascin-C of tissue extracts was analyzed by a standardized Western blot technique and densitometry. As a reference MAb, K8 displayed tenascin-C tissue concentrations of 4.1 +/- 2.3 microgram/mg total protein in normal mucosa, 13.8 +/- 4.7 microgram/mg in ulcerative colitis, 28.8 +/- 14.5 microgram/mg in colorectal carcinomas and 25.6 +/- 8.9 microgram/mg in liver metastases. The optical density values per microgram protein tissue extract of the 5 MAbs reflect the levels of the corresponding tenascin-C epitopes. Various signal intensities indicate a distinct diagnostic usefulness of the MAbs in detecting colorectal carcinomas. The binding characteristics of MAb J1/tn2 point to an under-representation of the TNfnD domain in metastasizing colorectal carcinomas, while MAb 19H12 showed an increased binding rate on the TNfnA1,2,4 region. Our comparative study of tenascin-C in inflammatory and neoplastic diseases of the colon mucosa substantiates the occurrence of large differences in the diagnostic value of tenascin-C MAbs. The detected alterations of tenascin-C in metastasizing colorectal carcinomas might indicate a prognostic value of specific tenascin-C isoforms.
Department of Surgery, University Clinic of Heidelberg, Heidelberg, Germany.
M
M
Dueck
S
S
Riedl
U
U
Hinz
A
A
Tandara
P
P
Möller
C
C
Herfarth
A
A
Faissner
D000911:Antibodies, Monoclonal / Q000378:metabolism; D015415:Biomarkers; D003093:Colitis, Ulcerative / Q000378:metabolism*; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D008113:Liver Neoplasms / Q000378:metabolism* / Q000556:secondary; D009363:Neoplasm Proteins / Q000378:metabolism*; D020033:Protein Isoforms / Q000378:metabolism; D019063:Tenascin / Q000378:metabolism*; D015854:Up-Regulation
D000911:Antibodies, Monoclonal; D015415:Biomarkers; D009363:Neoplasm Proteins; D020033:Protein Isoforms; D019063:Tenascin