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2013 ; 2
(5
): e91
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Evaluation of RNA Amplification Methods to Improve DC Immunotherapy Antigen
Presentation and Immune Response
#MMPMID23653155
Slagter-Jäger JG
; Raney A
; Lewis WE
; Debenedette MA
; Nicolette CA
; Tcherepanova IY
Mol Ther Nucleic Acids
2013[May]; 2
(5
): e91
PMID23653155
show ga
Dendritic cells (DCs) transfected with total amplified tumor cell RNA have the
potential to induce broad antitumor immune responses. However, analytical methods
required for quantitatively assessing the integrity, fidelity, and functionality
of the amplified RNA are lacking. We have developed a series of assays including
gel electrophoresis, northern blot, capping efficiency, and microarray analysis
to determine integrity and fidelity and a model system to assess functionality
after transfection into human DCs. We employed these tools to demonstrate that
modifications to our previously reported total cellular RNA amplification process
including the use of the Fast Start High Fidelity (FSHF) PCR enzyme, T7
Powerswitch primer, post-transcriptional capping and incorporation of a type 1
cap result in amplification of longer transcripts, greater translational
competence, and a higher fidelity representation of the starting total RNA
population. To study the properties of amplified RNA after transfection into
human DCs, we measured protein expression levels of defined antigens coamplified
with the starting total RNA populations and measured antigen-specific T cell
expansion in autologous DC-T cell co-cultured in vitro. We conclude from these
analyses that the improved RNA amplification process results in superior protein
expression levels and a greater capacity of the transfected DCs to induce
multifunctional antigen-specific memory T cells.Molecular Therapy-Nucleic Acids
(2013) 2, e91; doi:10.1038/mtna.2013.18; published online 7 May 2013.