Naslov
NKG2D ligands mediate immunosurveillance of senescent cells. Aging-US

Autori
Sagiv, A. ; Burton, DGA. ; Moshayev, Z. ; Wensveen, Felix Martinus ; Ben-Dor, S. ; Golani, O. ; Polić, B. ; Krizhanovsky, V.

Izvornik
Aging-US (1945-4589) 8 (2016), 2; 328-344

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
DNA damage response; ERK; NKG2D; Natural Killer Cell; fibrosis; senescence

Sažetak
Cellular senescence is a stress response mechanism that limits tumorigenesis and tissue damage. Induction of cellular senescence commonly coincides with an immunogenic phenotype that promotes self-elimination by components of the immune system, thereby facilitating tumor suppression and limiting excess fibrosis during wound repair. The mechanisms by which senescent cells regulate their immune surveillance are not completely understood. Here we show that ligands of an activating Natural Killer (NK) cell receptor (NKG2D), MICA and ULBP2 are consistently up-regulated following induction of replicative senescence, oncogene-induced senescence and DNA damage - induced senescence. MICA and ULBP2 proteins are necessary for efficient NK-mediated cytotoxicity towards senescent fibroblasts. The mechanisms regulating the initial expression of NKG2D ligands in senescent cells are dependent on a DNA damage response, whilst continuous expression of these ligands is regulated by the ERK signaling pathway. In liver fibrosis, the accumulation of senescent activated stellate cells is increased in mice lacking NKG2D receptor leading to increased fibrosis. Overall, our results provide new insights into the mechanisms regulating the expression of immune ligands in senescent cells and reveal the importance of NKG2D receptor-ligand interaction in protecting against liver fibrosis.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Temeljne medicinske znanosti

POVEZANOST RADA