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Tumor cells with B7.1 and transmembrane anchored staphylococcal enterotoxin A generate effective antitumor immunity.

Abstract
Staphylococcus enterotoxin A (SEA) stimulates T cells bearing certain TCR beta-chain variable regions, when bound to MHC-II molecules, and is a potent inducer of CTL activity and cytokines production. To decrease toxicity of SEA to the normal MHC-II(+) cells and to localize the immune response induced by SEA to the tumor site, my colleague previously genetically fused SEA with B7.1 transmembrane region (named as SEAtm) to make SEA express on the surface of tumor cells and tumor cells modified with SEAtm could induce efficient antitumor immunity in vitro. The tumor cell vaccines modified with multiple immune activators frequently elicited stronger antitumor immune responses than single-modified vaccines. In this study, we modified the tumor cell vaccine with B7.1 and SEAtm to improve efficiency in the application of SEA. First, SEAtm gene was subcloned from recombinant plasmid pLXSNSEP by PCR and murine B7.1 gene was cloned from splenocytes derived from C57BL/6 mice by RT-PCR. Then, the eukaryotic co-expression vector of SEA and murine B7.1 gene was constructed and named as pcDNA-BIS. B16 cell lines stably expressing SEA and/or B7.1 were established by screening with G418 after transfection and inactivated for the preparation of tumor cell vaccines to treat mice bearing established B16 tumors. The results indicated that the dual-modified tumor cell vaccine B16/B7.1+SEAtm (B16-BIS) elicited significantly stronger antitumor immune responses in vivo when compared with the single-modified tumor cell vaccines B16/B7.1 (B16-B7.1) and B16/SEAtm (B16-SEAtm), and supported the feasibility and effectiveness of the dual-modified tumor cell vaccine with superantigen and co-stimulatory molecule.
AuthorsShao-Yan Si, Pei-Zhen Hu, Ya-Yu Huang, Jing Ye, Yang Huang, Zeng-Shan Li, Wei Ge, Xia Li, Ping Qu, Xiu-Min Zhang, Yan-Fang Sui
JournalBiochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 347 Issue 1 Pg. 208-14 (Aug 18 2006) ISSN: 0006-291X [Print] United States
PMID16814254 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • B7-1 Antigen
  • Cancer Vaccines
  • Enterotoxins
  • enterotoxin A, Staphylococcal
Topics
  • Animals
  • B7-1 Antigen (genetics, immunology)
  • Cancer Vaccines (administration & dosage, immunology)
  • Cell Line, Tumor
  • Disease Models, Animal
  • Enterotoxins (genetics, immunology)
  • Female
  • Immunity, Innate (immunology)
  • Melanoma (immunology, pathology, prevention & control)
  • Mice
  • Mice, Inbred C57BL
  • Treatment Outcome

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