Plasminogen activators and tumor development in the human colon: activity levels in normal mucosa, adenomatous polyps, and adenocarcinomas - PubMed (original) (raw)
. 1987 Sep 1;47(17):4654-7.
- PMID: 3621160
Plasminogen activators and tumor development in the human colon: activity levels in normal mucosa, adenomatous polyps, and adenocarcinomas
P A de Bruin et al. Cancer Res. 1987.
Abstract
Malignant changes are often accompanied by alterations in activity and composition of the plasminogen activators (PA). To study the relationship between PA expression and the development of colorectal cancer, we determined urokinase-type plasminogen activator (u-PA) and tissue-type plasminogen activator (t-PA) activity in normal mucosa (n = 80), adenomatous polyps (n = 76), and adenocarcinomas (n = 71) of the colon. Tissues obtained from surgical resection or polypectomy were analyzed for t-PA and u-PA activity in a specific enzymatic assay using plasminogen, a chromogenic substrate, and selective quenching with monospecific antibodies to both activators. The plasminogen activator activities were found to be changed in adenocarcinomas as compared to normal mucosa. The relative contribution of u-PA (expressed as percentage of u-PA) was raised from 6 to 50% for, respectively, normal mucosa and adenocarcinoma. This change could be attributed to a 3-fold decrease in t-PA activity and a 5-fold increase in u-PA activity in the carcinomas. Adenomatous polyps as a group showed percentages of u-PA [20.2 +/- 1.3 (SE)] which were intermediate as well as significantly different (P less than 0.001) from those of normal mucosa and adenocarcinomas. This observation was strengthened by a gradual rise in the relative contribution of u-PA in four resection specimens containing both adenomatous polyps and adenocarcinomas. Zymography showed the presence of minor quantities of PA-PA inhibitor complexes in the tissue extracts studied. The present study shows that the sequence of normal mucosa-adenomatous polyp-adenocarcinoma in the colon is associated with a parallel change in plasminogen activator activity. Thus, change in the regulation of plasminogen activator activity is an early event in the development of colorectal cancer.
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