Activated macrophage survival is coordinated by TAK1 binding proteins
September R Mihaly1, Sho Morioka1, Jun Ninomiya-Tsuji1
1Department of Biological Sciences, Environmental and Molecular Toxicology, North Carolina State University, Raleigh, North Carolina, United States of America.
Plos One
|April 17, 2014
Summary
TGFβ-activated kinase (TAK1) activators, TAB1 and TAB2, are crucial for activated macrophage survival. Their absence leads to macrophage death, suggesting they are key targets for controlling inflammation by modulating macrophage viability.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Macrophages are key immune cells involved in tissue homeostasis and inflammation.
- Activated macrophages can undergo cell death, influencing the inflammatory state.
- The survival mechanisms of activated macrophages are not fully understood.
Purpose of the Study:
- To investigate the role of TGFβ-activated kinase (TAK1) activators, TAB1 and TAB2, in regulating activated macrophage survival.
- To determine if TAK1 activity is essential for activated macrophage viability.
- To explore the therapeutic potential of targeting TAB1 and TAB2 for inflammation control.
Main Methods:
- Deletion of Tak1, Tab1, or Tab2 in bone marrow-derived macrophages.
- Macrophage activation using lipopolysaccharide (LPS).
- Assessment of macrophage viability, cell death (necrosis and apoptosis), and TAK1 activation.
- In vivo studies using LPS challenge in mice with Tab1 deficiency.
Main Results:
- Deletion of Tak1 caused naive macrophage death.
- Single deletion of Tab1 or Tab2 led to death in LPS-activated macrophages.
- TAB1 and TAB2 redundantly regulate LPS-induced TAK1 activation.
- TAK1 activity is critical for activated macrophage survival.
- Tab1 deficiency impaired peritoneal macrophage response to LPS in vivo.
Conclusions:
- TAB1 and TAB2 are essential for activated macrophage survival through redundant regulation of TAK1 activation.
- TAK1 activity is the key determinant of activated macrophage viability.
- Targeting TAB1 and TAB2 offers a potential strategy to control inflammation by modulating macrophage survival.
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