Microvascular injury in pathogenesis of interferon-induced necrosis of subcutaneous tumors in mice
- PMID: 2921774
- DOI: 10.1093/jnci/81.7.497
Microvascular injury in pathogenesis of interferon-induced necrosis of subcutaneous tumors in mice
Abstract
DBA/2 mice were injected sc with cells from the highly malignant Friend erythroleukemia cell (FLC) 3Cl8 subline, which is resistant to mouse interferon alpha/beta, or with the ESb lymphoma. When interferon alpha/beta was injected intratumorally or peritumorally, tumor growth was markedly suppressed, and established vascularized tumor nodules became progressively necrotic. Tumor necrosis was of the coagulation type that usually results from deprivation of blood flow. Morphologic examination of approximately 1,000 blood vessel profiles and approximately 2,000 endothelial cells in 1-micron Epon sections of sc 3C18 FLC tumors showed that interferon treatment resulted in rapid and pronounced vascular endothelial cell damage that preceded tumor necrosis. No inflammatory cell infiltrate was observed. Our results suggest that interferon alpha/beta exerted an antitumor effect in these tumor models by damaging tumor blood vessels, causing disruption of tumor blood flow, which led to ischemic tumor necrosis.
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