Protein sialylation by sialyltransferase involves radiation resistance

Molecular Cancer Research : MCR
Minyoung LeeYun-Sil Lee

Abstract

Previously, we identified beta-galactoside alpha(2,6)-sialyltransferase (ST6Gal I) as a candidate biomarker for ionizing radiation. The expression of ST6Gal I and the level of protein sialylation increased following radiation exposure in a dose-dependent manner. Radiation induced ST6Gal I cleavage and the cleaved form of ST6Gal I was soluble and secreted. Sialylation of integrin beta1, a glycosylated cell surface protein, was stimulated by radiation exposure and this increased its stability. Overexpression of ST6Gal I in SW480 colon cancer cells that initially showed a low level of ST6Gal I expression increased the sialylation of integrin beta1 and also increased the stability of the protein. Inhibition of sialylation by transfection with neuraminidase 2 or neuraminidase 3 or by treatment with short interfering RNA targeting ST6Gal I reversed the effects of ST6Gal I overexpression. In addition, ST6Gal I overexpression increased clonogenic survival following radiation exposure and reduced radiation-induced cell death and caspase 3 activation. However, removal of sialic acids by neuraminidase 2 or knockdown of expression by short interfering RNA targeting ST6Gal I restored radiation-induced cell death phenotypes. In conclusion, r...Continue Reading

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