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From the Extracellular Matrix Section *
and the Flow
Cytometry Unit,
Laboratory of Pathology,
Division of Clinical Sciences National Cancer Institute, National
Institutes of Health, Bethesda, Maryland
Epstein-Barr virus (EBV)-positive Burkitts lymphoma cells and EBV-infected B cells elicit humoral factors that inhibit tumor-induced angiogenesis, resulting in tumor necrosis and regression. Of the chemokine factors identified in association with this growth behavior, none have induced complete tumor regression. We have previously identified tissue inhibitors of metalloproteinase (TIMP)-1 in various B cell lymphoma cell lines. Here we show that induction of TIMP-1 expression in an EBV-negative Burkitts lymphoma cell line results in a biphasic, in vivo tumor growth pattern in the nude mouse that is essentially identical to EBV-positive Burkitts lymphoma cell lines. The initial effect of TIMP-1 is to enhance tumor growth, consistent with the reported anti-apoptotic effect of TIMP-1 on B cell growth. Tumor necrosis and regression then follow the initial period of rapid, increased tumor growth. Only microscopic foci of residual, proliferating tumor cells are observed on biopsy of the tumor site. This latter effect is mediated by TIMP-1 inhibition of an angiogenic response within the developing tumor mass, as demonstrated by immunostaining and microvessel counts. These findings suggest that TIMP-1 is an important mediator of the in vivo growth properties of EBV-positive Burkitts lymphoma.
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