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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 Cancer+Immunol+Immunother
2014 ; 63
(10
): 1009-21
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Radiation-induced autophagy potentiates immunotherapy of cancer via up-regulation
of mannose 6-phosphate receptor on tumor cells in mice
#MMPMID24943275
Kim S
; Ramakrishnan R
; Lavilla-Alonso S
; Chinnaiyan P
; Rao N
; Fowler E
; Heine J
; Gabrilovich DI
Cancer Immunol Immunother
2014[Oct]; 63
(10
): 1009-21
PMID24943275
show ga
There is a significant body of evidence demonstrating that radiation therapy
(XRT) enhances the effect of immune therapy. However, the precise mechanisms by
which XRT potentiates the immunotherapy of cancer remain elusive. Here, we report
that XRT potentiates the effect of immune therapy via induction of autophagy and
resultant trafficking of mannose-6-phopsphate receptor (MPR) to the cell surface.
Irradiation of different tumor cells caused substantial up-regulation of MPR on
the cell surface in vitro and in vivo. Down-regulation of MPR in tumor cells with
shRNA completely abrogated the combined effect of XRT and immunotherapy (CTLA4
antibody) in B16F10-bearing mice without changes in the tumor-specific responses
of T cells. Radiation-induced MPR up-regulation was the result of redistribution
of the receptor to the cell surface. This effect was caused by autophagy with
redirection of MPR to autophagosomes in a clathrin-dependent manner. In
autophagosomes, MPR lost its natural ligands, which resulted in subsequent
trafficking of empty receptor(s) back to the surface. Together, our data
demonstrated a novel mechanism by which XRT can enhance the effect of
immunotherapy and the molecular mechanism of this process.