Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=27141372
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Hypoxic tumor-derived microvesicles negatively regulate NK cell function by a
mechanism involving TGF-? and miR23a transfer
#MMPMID27141372
Berchem G
; Noman MZ
; Bosseler M
; Paggetti J
; Baconnais S
; Le Cam E
; Nanbakhsh A
; Moussay E
; Mami-Chouaib F
; Janji B
; Chouaib S
Oncoimmunology
2016[Apr]; 5
(4
): e1062968
PMID27141372
show ga
Tumor-derived microvesicles (TD-MVs) are key mediators which are shed by cancer
cells and can sensitize neighboring cells in the tumor microenvironment. TD-MVs
are extracellular vesicles composed of exosomes and MVs and promote cancer
invasion and metastasis. Intratumoral hypoxia is an integral component of all
solid tumors. The relationship between hypoxic tumor-shed MVs and NK-mediated
cytotoxicity remains unknown. In this paper, we reported that MVs derived from
hypoxic tumor cells qualitatively differ from those derived from normoxic tumor
cells. Using multiple tumor models, we showed that hypoxic MVs inhibit more NK
cell function as compared to normoxic MVs. Hypoxic TD-MVs package two
immunosuppressive factors involved in the impairment of natural killer (NK) cell
cytotoxicity against different tumor cells in vitro and in vivo. We showed that
following their uptake by NK cells, hypoxic TD-MVs transfer TGF-?1 to NK cells,
decreasing the cell surface expression of the activating receptor NKG2D, thereby
inhibiting NK cell function. MicroRNA profiling revealed the presence of high
levels of miR-210 and miR-23a in hypoxic TD-MVs. We demonstrated that miR-23a in
hypoxic TD-MVs operates as an additional immunomosuppressive factor, since it
directly targets the expression of CD107a in NK cells. To our knowledge, this is
the first study to show that hypoxic tumor cells by secreting MVs can educate NK
cells and decrease their antitumor immune response. This study highlights the
existence of a novel mechanism of immune suppression mediated by hypoxic TD-MVs
and further improves our understanding of the immunosuppressive mechanisms
prevailing in the hypoxic tumor microenvironment.