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• W2616421636 endingPage "1288" @default.
• W2616421636 startingPage "1282" @default.
• W2616421636 abstract "Dramatic changes in the glycan structures of cell surface proteins have been observed upon malignant transformation of cells as induced by the altered expression levels of glycosyltransferases. Such changes are closely associated with the malignant properties of cancer cells. Transcription factor Sp1 regulates the gene expression of various molecules including glycosyltransferases. Herein, we investigated whether or not Sp1-downregulation affects to N-glycosylation of glycoproteins and malignant properties of A549 human lung cancer cell line. We established a stable clone whose Sp1-expression level was reduced to 50% of a control clone by RNA interference. Lectin blotting revealed that the β4-galactosylation of highly branched N-glycans decreases mainly in cell adhesion molecule, E-cadherin. The analysis of underlying mechanism for decreased β4-galactosylation of N-glycans showed that the gene expression level of β4-galactosyltransferase (β4GalT) 1 decreases dramatically by downregulation of Sp1 without changes in those of β4GalT2 and N-acetylglucosaminyltransferase V. Mutations in the Sp1-binding sites of the β4GalT1 gene promoter showed that the promoter activity decreases significantly, indicating that the gene expression is regulated by Sp1. These results indicate that the β4-galactosylation of highly branched N-glycans decreases by downregulation of Sp1 through the reduced expression of the β4GalT1 gene. Furthermore, the Sp1-downregulated cells showed the suppression of the anchorage-independent growth in soft agar and migratory activity when compared to the control cells. The present study demonstrates that downregulation of Sp1 suppresses the malignant properties of A549 cells through the decreased β4-galactosylation of highly branched N-glycans." @default.
• W2616421636 created "2017-05-26" @default.
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• W2616421636 date "2017-01-01" @default.
• W2616421636 modified "2023-10-17" @default.
• W2616421636 title "Downregulation of Transcription Factor Sp1 Suppresses Malignant Properties of A549 Human Lung Cancer Cell Line with Decreased β4-Galactosylation of Highly Branched <i>N</i>-Glycans" @default.
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• W2616421636 doi "https://doi.org/10.1248/bpb.b17-00212" @default.
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