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Stimulation of Tumor Growth by Human Soluble Intercellular Adhesion Molecule-1

Craniofacial Developmental Biology and Regeneration Branch, National Institute of Dental and Craniofacial Research, NIH, Bethesda, Maryland 20892 [Y. S. G., P. N. K., H-C. L., M. E., H. K. K.], and Graduate School of East-West Medical Science, Kyunghee University, Yong In, Korea [Y. S. G.]

Because serum levels of soluble intercellular adhesion molecule-1 (sICAM-1) are elevated in cancer and sICAM-1 is angiogenic, we tested the ability of sICAM-1 to promote tumor growth. Our preliminary experiments showed that exogenous sICAM-1 significantly stimulated the growth of human tumors in vivo. Human fibrosarcoma transfectants, which express ICAM-1, produce ICAM-1 on the cell surface and release sICAM-1 into the medium without any apparent effect on cell growth in vitro. We found that conditioned medium from sense ICAM-1 transfectants compared with mock or antisense ICAM-1 transfectants stimulates endothelial cell migration in vitro and neovascularization in the chick chorioallantoic membrane assay. Tumor cells transfected with sense constructs form faster growing tumors than mock- and antisense-transfected cells in both chick embryos and nude mice models. Serum levels of human sICAM-1 from nude mice bearing sense ICAM-1 transfectants correlate positively with tumor weight. Sense ICAM-1 transfectants are more proliferative and induce more blood vessel formation than mock and antisense transfectants in nude mice. Because expression of ICAM-1 does not affect tumor cell growth in vitro, the angiogenic activity of sICAM-1 produced by sense ICAM-1 transfectants may be involved in the stimulation of tumor growth. Therefore, sICAM-1 may perform dual functions that are essential for tumor growth: angiogenesis and escape from immune surveillance.

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