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Journal Article
Research Support, Non-U.S. Gov't
Antineoplastic urinary protein inhibits Kaposi's sarcoma and angiogenesis in vitro and in vivo.
Blood 1999 Februrary 2
Kaposi's sarcoma (KS) is the most common tumor in human immunodeficiency virus infection and acquired immune deficiency syndrome. Recent clinical trials with human chorionic gonadotropin (hCG) prepared from early pregnancy urine have shown encouraging results in the resolution of KS lesions. A urinary protein with antitumor activity, ANUP (antineoplastic urinary protein), a dimer of 32 kD, has previously been shown to inhibit the growth of various tumor cell lines in vivo. It was thus studied for its activity in KS cell lines in vitro and in vivo to determine whether it could be a source of the anti-KS activity observed in hCG preparations. ANUP is a strong growth inhibitor for KS cell lines, but has little or no effect on fibroblast, aortic smooth muscle, T- and B-lymphocyte, and monocyte cell lines. ANUP also inhibited the proliferation of endothelial cell lines, suggesting that the in vitro effects were endothelial cell lineage-specific. However, ANUP antibodies did not block the inhibitory effect of certain commercial preparations of hCG, previously shown to be active in KS. Thus, the active protein in these commercial preparations of hCG may be distinct from ANUP. The antitumor activity of ANUP was further confirmed in a chicken allantoic membrane (CAM) assay in which vascular endothelial growth factor (VEGF) and beta fibroblast growth factor (bFGF)-induced angiogenesis was inhibited by ANUP in a dose-dependent manner. In vivo activity of ANUP was demonstrated in the murine model of KS, where ANUP inhibited tumor growth. ANUP is thus a potential candidate for development in the treatment of KS and other diseases in which angiogenesis plays an important role.
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