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Departments of Neurosurgery [J. S. R., S. M., R. S.] and Neuro-Oncology [P. A. S.], University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, and Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892 [W. G. S. S., L. A. L.]
Local invasive growth is one of the key features of primary malignant brain tumors accompanied by remodeling of the vasculature and destruction of normal brain tissue. Tissue invasiveness is an essential biological function used by a tumor to overcome the various barriers to its progression. The expression of metalloproteases has been shown to play a critical role in the invasive process in a number of tumors; however, their expression in human brain tumors has not been previously reported. In this study we showed metalloprotease activities at Mr 240,000, 123,000, 92,000, 72,000, and 67,000 in brain tumor extracts. These enzyme activities were inhibited by EDTA, an inhibitor of metalloproteases. Significant increases in levels of protease bands at Mr 92,000, 123,000, and 240,000 were observed in glioblastoma and metastatic lung tumors. Enzymatic inhibition and Western blotting with Mr 92,000 type IV collagenase antibody confirmed the presence of Mr 92,000 type IV collagenase in all samples. Quantitative analysis by densitometry showed 810-fold and 68-fold increases in Mr 92,000 type IV collagenase activity in glioblastoma and metastatic lung carcinoma samples, respectively, when compared with normal brain, meningioma, astrocytoma, metastatic colon, and breast carcinoma samples. These findings provide evidence for elevated levels of metalloproteases in glioblastomas and suggest a therapeutic target for minimizing the invasive propensity of gliomas using protease inhibitors.
1 Support for these studies was provided in part by the Tunica Foundation, the Windey Will Case Foundation (Chicago), and IRG and PRS funds were provided by the University of Texas M. D. Anderson Cancer Center, Houston, Texas.
2 To whom requests for reprints should be addressed, at Department of Neurosurgery, Box 064, M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030.
Received 2/15/93. Accepted 4/ 1/93.
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