Tobacco Mosaic Virus as a New Carrier for Tumor Associated Carbohydrate Antigens

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• 作者：Zhaojun Yin ; Huong Giang Nguyen ; Sudipa Chowdhury ; Philip Bentley ; Michael A. Bruckman ; Adeline Miermont ; Jeffrey C. Gildersleeve ; Qian Wang ; Xuefei Huang
• 刊名：Bioconjugate Chemistry
• 出版年：2012
• 出版时间：August 15, 2012
• 年：2012
• 卷：23
• 期：8
• 页码：1694-1703
• 全文大小：560K
• 年卷期：v.23,no.8(August 15, 2012)
• ISSN：1520-4812

文摘

Tumor-associated carbohydrate antigens (TACAs) are being actively studied as targets for antitumor vaccine development. One serious challenge was the low immunogenecity of these antigens. Herein, we report the results of using the tobacco mosaic virus (TMV) capsid as a promising carrier of a weakly immunogenic TACA, the monomeric Tn antigen. The copper(I) catalyzed azide鈥揳lkyne cycloaddition reaction was highly efficient in covalently linking Tn onto the TMV capsid without resorting to a large excess of the Tn antigen. The location of Tn attachment turned out to be important. Tn introduced at the N terminus of TMV was immunosilent, while that attached to tyrosine 139 elicited strong immune responses. Both Tn specific IgG and IgM antibodies were generated as determined by enzyme-linked immunosorbent assay and a glycan microarray screening study. The production of high titers of IgG antibodies suggested that the TMV platform contained the requisite epitopes for helper T cells and was able to induce antibody isotype switching. The antibodies exhibited strong reactivities toward Tn antigen displayed in its native environment, i.e., cancer cell surface, thus highlighting the potential of TMV as a promising TACA carrier.