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2016 ; 6
(ä): 24506
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Re-polarizing Myeloid-derived Suppressor Cells (MDSCs) with Cationic Polymers for
Cancer Immunotherapy
#MMPMID27074905
He W
; Liang P
; Guo G
; Huang Z
; Niu Y
; Dong L
; Wang C
; Zhang J
Sci Rep
2016[Apr]; 6
(ä): 24506
PMID27074905
show ga
Our evolving understandings of cell-material interactions provide insights for
using polymers to modulate cell behaviour that may lead to therapeutic
applications. It is known that in certain cancers, myeloid-derived suppressor
cells (MDSCs) play vital roles in promoting tumour progression, chiefly because
of their 'alternatively activated' (or M2) phenotype that orchestrates
immunosuppression. In this study, we demonstrated that two cationic polymers -
cationic dextran (C-dextran) and polyethyleneimine (PEI) - could directly remodel
these cells into an anti-tumour, 'classically activated' (or M1) phenotype,
thereby stimulating these cells to express tumouricidal cytokines, reactivating
the T cell functions, and prolonging the lifespan of the mice model. Our
investigations with knock-out mice further indicate that the functions of these
cationic polymers require the involvement of toll-like receptor 4-mediated
signalling. Taken together, our study suggests that these cationic polymers can
effectively and directly re-polarize MDSCs from an immunosuppressive
characteristic to an anti-tumour phenotype, leading to successful restoration of
immune surveillance in the tumour microenvironment and elimination of tumour
cells. Our findings may have immediate impact on further development of
polymer-based therapeutics for cancer immunotherapy.