NBS1 is required for macrophage homeostasis and functional activity in mice.

Abstract:

:Nijmegen breakage syndrome 1 (NBS1) is a component of the MRE11 complex, which is a sensor of DNA double-strand breaks and plays a crucial role in the DNA damage response. Because activated macrophages produce large amounts of reactive oxygen species (ROS) that can cause DNA lesions, we examined the role of NBS1 in macrophage functional activity. Proliferative and proinflammatory (interferon gamma [IFN-γ] and lipopolysaccharide [LPS]) stimuli led to increased NBS1 levels in macrophages. In mice expressing a hypomorphic allele of Nbs1, Nbs1(∆B/∆B), macrophage activation-induced ROS caused increased levels of DNA damage that were associated with defects in proliferation, delayed differentiation, and increased senescence. Furthermore, upon stimulation, Nbs1(∆B/∆B) macrophages exhibited increased expression of proinflammatory cytokines. In the in vivo 2,4-dinitrofluorobenzene model of inflammation, Nbs1(∆B/∆B) animals showed increased weight and ear thickness. By using the sterile inflammation by zymosan injection, we found that macrophage proliferation was drastically decreased in the peritoneal cavity of Nbs1(∆B/∆B) mice. Our findings show that NBS1 is crucial for macrophage function during normal aging. These results have implications for understanding the immune defects observed in patients with NBS and related disorders.

journal_name

Blood

journal_title

Blood

authors

Pereira-Lopes S,Tur J,Calatayud-Subias JA,Lloberas J,Stracker TH,Celada A

doi

10.1182/blood-2015-04-637371

subject

Has Abstract

pub_date

2015-11-26 00:00:00

pages

2502-10

issue

22

eissn

0006-4971

issn

1528-0020

pii

blood-2015-04-637371

journal_volume

126

pub_type

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