Abstract:
:Gram-negative bacterial outer membrane proteins (Omps) have an important role in pathogenesis and signal reception. We previously reported that Acinetobacter OmpA (AbOmpA) induced maturation of bone marrow-derived dendritic cells (BMDCs) and that AbOmpA-primed DCs produced IL-12 which generated Th1 CD4(+) T-cells. We analyzed the effects of Salmonella typhimurium OmpA (OmpA-Sal) on dendritic cell (DC) maturation in the present study, and determined that tumor antigen-pulsed DCs stimulated with OmpA-Sal induced anti-tumor responses in a mouse model. OmpA-Sal activated BMDCs by augmenting expression of MHC class II and of the co-stimulatory molecules CD80 and CD86. RT-PCR revealed that IL-12(p40) gene expression is highly augmented in OmpA-Sal-stimulated BMDCs. DNA (CRT/E7) vaccination combined with OmpA-Sal stimulation generated more antigen-specific CD8(+) T-cells in the present study. Certain antigen-pulsed BMDCs stimulated with OmpA-Sal induced strong PADRE-specific CD4(+) and E7-specific CD8(+) T-cell responses. In addition, BMDCs stimulated with OmpA-Sal (OmpA-Sal-BMDCs) and pulsed with both E7 and PADRE peptide generated greater numbers of E7-specific CD8(+) effector and memory T-cells than those pulsed with E7 peptide alone. E7- and PADRE-expressing OmpA-Sal-BMDC vaccines resulted in significant long-term protective anti-tumor effects in vaccinated mice. Our data suggested that E7- and PADRE-expressing BMDCs that were matured in the presence of OmpA-Sal might enhance anti-tumor immunity and support the therapeutic use of OmpA-Sal in DC-based immunotherapy.
journal_name
Vaccinejournal_title
Vaccineauthors
Jang MJ,Kim JE,Chung YH,Lee WB,Shin YK,Lee JS,Kim D,Park YMdoi
10.1016/j.vaccine.2011.01.036subject
Has Abstractpub_date
2011-03-16 00:00:00pages
2400-10issue
13eissn
0264-410Xissn
1873-2518pii
S0264-410X(11)00075-2journal_volume
29pub_type
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