Construction and characterization of DNA vaccines encoding the single-chain variable fragment of the anti-idiotype antibody 1A7 mimicking the tumor-associated antigen ... View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2000-11

AUTHORS

Hasan E Zeytin, Pulak K Tripathi, Malaya Bhattacharya-Chatterjee, Kenneth A Foon, Sunil K Chatterjee

ABSTRACT

Anti-idiotype antibody, 1A7, functionally mimics the tumor-associated antigen disialoganglioside GD2, which is overexpressed on the surface of a number of neuroectodermal tumors such as melanoma, neuroblastoma, soft tissue sarcoma, and small cell carcinoma of the lung. Immunization of mice with 1A7 generated the production of anti-GD2 antibodies. In a phase I clinical trial, immunization of patients with 1A7, mixed with the adjuvant QS21, demonstrated that 1A7 could act as a surrogate antigen for GD2 and induce strong humoral immune responses in advanced stage melanoma patients. DNA vaccines have recently been shown to invoke humoral as well as cellular responses in injected hosts against the transgene product. To evaluate the efficiency of DNA vaccines encoding anti-idiotype antibodies, we constructed expression plasmids encoding the variable heavy (VH) and variable light (VL) chains of 1A7. The plasmids were made in two configurations, expressing either the VH (pc1A7VHLnVL) or the VL (pc1A7VLLnVH) chain of 1A7 at the amino terminus, linked together by a 15-amino acid linker (Ln). In vitro transcription/translation assays and transfection of CHO-K1 cells with the plasmids demonstrated that a approximately 30-kDa protein was expressed by both configurations of the single-chain variable fragment. This protein can be specifically precipitated by monoclonal anti-GD2 antibody, 14G2a. Following intramuscular injection in mice, the plasmids were detectable in the injected tissues for at least 3 months and the injected plasmids actively transcribed the single-chain variable fragment 1A7 gene at the injected site. A single, intramuscular immunization of a group of C57BL/6 mice with pc1A7VLLnVH in phosphate-buffered saline induced humoral immune responses against 1A7 as well as GD2, the nominal antigen. Multiple immunizations, however, were required to elicit stronger immune responses. More... »

PAGES

7700240

References to SciGraph publications

Journal

TITLE

Cancer Gene Therapy

ISSUE

11

VOLUME

7

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/sj.cgt.7700240

    DOI

    http://dx.doi.org/10.1038/sj.cgt.7700240

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1027551827

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/11129285


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