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Engineering an improved dendritic cell vaccine expressing whole antigen following non-viral transfection

Rao, Ankit Rohit (2012)
Ph.D. thesis, University of Birmingham.

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Abstract

Dendritic cells are efficient antigen-presenting-cells that can be used in tumour-antigen specific vaccination for malignant disease. Melanoma patients were recently treated with a dendritic cell vaccine expressing gp100 and Melan-A antigens after non-viral (CL22 peptide) transfection. Although clinical and immunological responses were noted, there was no correlation between responses and whole antigen expression levels in the vaccine cells that varied widely. Here, it is established that patient cells expressed detectable levels of Class I restricted epitopes from both antigens, although there was no correlation with whole antigen detection. CL22 transfected dendritic cells could simultaneously present a viral antigen (EBNA1) to CD8 and CD4 T-cells, which had not previously been demonstrated. Using RNA transfection, it was demonstrated that early after transfection cells are whole Melan-A positive yet negative for Class I epitopes and with time Melan-A antigen levels fall whilst Class I epitopes are generated. Loss of whole antigen expression seemed related to lysosomal function and, unlike the viral antigen EBNA1, Class I presentation from Melan-A was lysosome-dependent. For Class II presentation of EBNA1, cellular localisation seems to determine access to the Class II pathway although this depends on the time-scale over which epitope presentation is assessed.

Type of Work:Ph.D. thesis.
Supervisor(s):Steele, Jane
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:School of Cancer Sciences
Subjects:QR180 Immunology
QR355 Virology
RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Institution:University of Birmingham
ID Code:3622
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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