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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 Oncoimmunology
2015 ; 4
(12
): e1052353
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English Wikipedia
Natural Killer (NK)/melanoma cell interaction induces NK-mediated release of
chemotactic High Mobility Group Box-1 (HMGB1) capable of amplifying NK cell
recruitment
#MMPMID26587323
Parodi M
; Pedrazzi M
; Cantoni C
; Averna M
; Patrone M
; Cavaletto M
; Spertino S
; Pende D
; Balsamo M
; Pietra G
; Sivori S
; Carlomagno S
; Mingari MC
; Moretta L
; Sparatore B
; Vitale M
Oncoimmunology
2015[Dec]; 4
(12
): e1052353
PMID26587323
show ga
In this study we characterize a new mechanism by which Natural Killer (NK) cells
may amplify their recruitment to tumors. We show that NK cells, upon interaction
with melanoma cells, can release a chemotactic form of High Mobility Group Box-1
(HMGB1) protein capable of attracting additional activated NK cells. We first
demonstrate that the engagement of different activating NK cell receptors,
including those mainly involved in tumor cell recognition can induce the active
release of HMGB1. Then we show that during NK-mediated tumor cell killing two
HMGB1 forms are released, each displaying a specific electrophoretic mobility
possibly corresponding to a different redox status. By the comparison of normal
and perforin-defective NK cells (which are unable to kill target cells) we
demonstrate that, in NK/melanoma cell co-cultures, NK cells specifically release
an HMGB1 form that acts as chemoattractant, while dying tumor cells passively
release a non-chemotactic HMGB1. Finally, we show that Receptor for Advanced
Glycation End products is expressed by NK cells and mediates HMGB1-induced NK
cell chemotaxis. Proteomic analysis of NK cells exposed to recombinant HMGB1
revealed that this molecule, besides inducing immediate chemotaxis, also promotes
changes in the expression of proteins involved in the regulation of the
cytoskeletal network. Importantly, these modifications could be associated with
an increased motility of NK cells. Thus, our findings allow the definition of a
previously unidentified mechanism used by NK cells to amplify their response to
tumors, and provide additional clues for the emerging role of HMGB1 in
immunomodulation and tumor immunity.