Telomere Dysfunction Disturbs Macrophage Mitochondrial Metabolism and the NLRP3 Inflammasome through the...

Area of Science:

• Immunology
• Cell Biology
• Aging Research

Background:

• Immune and inflammation dysregulation are hallmarks of aging, contributing to age-related diseases.
• The precise mechanisms linking aging, immune function, and inflammation remain incompletely understood.

Purpose of the Study:

• To investigate the impact of telomere dysfunction on innate immune cell defense and function.
• To elucidate the molecular mechanisms connecting telomere attrition to immune dysregulation in aging.

Main Methods:

• Utilized late-generation Terc knockout (Terc-/-) mice to model telomere dysfunction.
• Assessed lung inflammation, mortality, and pathogen-clearing capacity following Staphylococcus infection.
• Analyzed macrophage mitochondrial function, oxidative stress, and NLRP3 inflammasome activation.

Main Results:

• Terc-/- mice exhibited heightened lung inflammation and increased mortality but maintained pathogen-clearing ability.
• Telomere dysfunction led to macrophage mitochondrial abnormalities, oxidative stress, and NLRP3 inflammasome hyperactivation.
• The ubiquitin-editing enzyme TNFAIP3 and PGC-1α were identified as critical regulators of mitochondrial and inflammatory gene expression.

Conclusions:

• Telomere dysfunction disrupts innate immune cell function by affecting mitochondrial metabolism and promoting inflammation.
• TNFAIP3 and PGC-1α play a crucial role in maintaining telomere homeostasis and regulating immune responses.
• This study establishes a novel connection between telomeres, mitochondrial function, innate immunity, and inflammation in the context of aging.