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Inhibition of tumor invasion and metastasis by calciumspirulan (Ca-SP), a novel sulfated polysaccharide derived from a blue-green alga, Spirulina platensis

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Abstract

We have investigated the effect of calcium spirulan (Ca-SP) isolated from a blue-green alga, Spirulinaplatensis, which is a sulfated polysaccharide chelating calcium and mainly composed of rhamnose, on inva-sionof B16-BL6 melanoma, Colon 26 M3.1 carcinoma and HT-1080 fibrosarcoma cells through reconsti-tutedbasement membrane (Matrigel). Ca-SP significantly inhibited the invasion of these tumor cells throughMatrigel/fibronectin-coated filters. Ca-SP also inhibited the haptotactic migration of tumor cells to laminin,but it had no effect on that to fibronectin. Ca-SP prevented the adhesion of B16-BL6 cells to Matrigel andlaminin substrates but did not affect the adhesion to fibronectin. The pretreatment of tumor cells withCa-SP inhibited the adhesion to laminin, while the pretreatment of laminin substrates did not. Ca-SP hadno effect on the production and activation of type IV collagenase in gelatin zymography. In contrast, Ca-SPsignificantly inhibited degradation of heparan sulfate by purified heparanase. The experimental lungmetastasis was significantly reduced by co-injection of B16-BL6 cells with Ca-SP. Seven intermittent i.v.injections of 100 mg of Ca-SP caused a marked decrease of lung tumor colonization of B16-BL6 cells in aspontaneous lung metastasis model. These results suggest that Ca-SP, a novel sulfated polysaccharide, couldreduce the lung metastasis of B16-BL6 melanoma cells, by inhibiting the tumor invasion of basementmembrane probably through the prevention of the adhesion and migration of tumor cells to laminin substrateand of the heparanase activity.©Kluwer Academic Publishers

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Mishima, T., Murata, J., Toyoshima, M. et al. Inhibition of tumor invasion and metastasis by calciumspirulan (Ca-SP), a novel sulfated polysaccharide derived from a blue-green alga, Spirulina platensis. Clin Exp Metastasis 16, 541–550 (1998). https://doi.org/10.1023/A:1006594318633

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