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2017 ; 8
(2
): e2598
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TAK1 regulates resident macrophages by protecting lysosomal integrity
#MMPMID28182011
Sakamachi Y
; Morioka S
; Mihaly SR
; Takaesu G
; Foley JF
; Fessler MB
; Ninomiya-Tsuji J
Cell Death Dis
2017[Feb]; 8
(2
): e2598
PMID28182011
show ga
Hematopoietic cell survival and death is critical for development of a functional
immune system. Here, we report that a protein kinase, TAK1, is selectively
required for resident macrophage integrity during embryogenesis. Hematopoietic
lineage-specific deletion of Tak1 gene (Tak1(HKO)) caused accumulation of
cellular debris in the thymus in perinatal mice. Although no overt alteration in
thymocytes and blood myeloid populations was observed in Tak1(HKO) mice, we found
that thymic and lung macrophages were diminished. In the in vitro setting, Tak1
deficiency caused profound disruption of lysosomes and killed bone marrow-derived
macrophages (BMDMs) without any exogenous stressors. Inhibition of the lysosomal
protease, cathepsin B, partially blocked Tak1-deficient BMDM death, suggesting
that leakage of the lysosomal contents is in part the cause of cell death. To
identify the trigger of this cell death, we examined involvement of TNF and
Toll-like receptor pathways. Among them, we found that deletion of Tnfr1
partially rescued cell death. Finally, we show that Tnfr1 deletion partially
restored thymic and lung macrophages in vivo. These results suggest that
autocrine and potentially paracrine TNF kills Tak1-deficient macrophages during
development. Our results reveal that TAK1 signaling maintains proper macrophage
populations through protecting lysosomal integrity.
|Animals
[MESH]
|Cell Death/physiology
[MESH]
|Cell Survival/physiology
[MESH]
|Embryonic Development/physiology
[MESH]
|Lung/metabolism
[MESH]
|Lysosomes/*metabolism
[MESH]
|MAP Kinase Kinase Kinases/*metabolism
[MESH]
|Macrophages/*metabolism
[MESH]
|Mice
[MESH]
|Mice, Inbred C57BL
[MESH]
|Protective Agents/*metabolism
[MESH]
|Receptors, Tumor Necrosis Factor, Type I/metabolism
[MESH]