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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Exp+Clin+Cancer+Res
2018 ; 37
(1
): 126
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Reprogramming the murine colon cancer microenvironment using lentivectors
encoding shRNA against IL-10 as a component of a potent DC-based
chemoimmunotherapy
#MMPMID29954431
Rossowska J
; Anger N
; Szczygie? A
; Mierzejewska J
; Pajtasz-Piasecka E
J Exp Clin Cancer Res
2018[Jun]; 37
(1
): 126
PMID29954431
show ga
BACKGROUND: The excessive amounts of immunosuppressive factors present in a tumor
microenvironment (TME) reduce the effectiveness of cancer vaccines. The main
objective of our research was to improve the effectiveness of dendritic cell
(DC)-based immunotherapy or chemoimmunotherapy composed of cyclophosphamide (CY)
and DCs by application of lentivectors encoding shRNA specific to IL-10 (shIL10
LVs) in murine colon carcinoma MC38 model. METHODS: The efficacy of shIL10 LVs in
silencing of IL-10 expression was measured both in vitro and in vivo using
Real-Time PCR and ELISA assays. In addition, the influence of intratumorally
inoculated lentivectors on MC38 tumor microenvironment was examined using flow
cytometry method. The effect of applied therapeutic schemes was determined by
measurement of tumor growth inhibition and activation state of local and systemic
immune response. RESULTS: We observed that intratumorally inoculated shIL10 LVs
transduced tumor and TME-infiltrating cells and reduced the secretion of IL-10.
Application of shIL10 LVs for three consecutive weeks initiated tumor growth
inhibition, whereas treatment with shIL10 LVs and BMDC/TAg did not enhance the
antitumor effect. However, when pretreatment with CY was introduced to the
proposed scheme, we noticed high MC38 tumor growth inhibition accompanied by
reduction of MDSCs and Tregs in TME, as well as activation of potent local and
systemic Th1-type antitumor response. CONCLUSIONS: The obtained data shows that
remodeling of TME by shIL10 LVs and CY enhances DC activity and supports them
during regeneration and actuation of a potent antitumor response. Therefore,
therapeutic strategies aimed at local IL-10 elimination using lentiviral vectors
should be further investigated in context of combined chemoimmunotherapies.