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Old macrophages lose their (circadian) rhythm
Helen M McRae1, Diana C Hargreaves1
1Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
Trends in Immunology
|March 14, 2022
Summary
Aging disrupts daily rhythms in macrophage gene expression and immune function in mice. A key factor, KLF4 (Kruppel-like factor 4), regulating these immune rhythms is lost in older macrophages.
Area of Science:
- Immunology
- Chronobiology
- Molecular Biology
Background:
- Circadian rhythms influence daily immune cell activity and function.
- Immune system function declines with age, a phenomenon known as immunosenescence.
Purpose of the Study:
- To investigate the impact of aging on the circadian patterns of macrophage gene expression and immune function.
- To identify key molecular regulators of these rhythmic immune processes in aging.
Main Methods:
- Comparative analysis of macrophage gene expression in young and aging mice.
- Functional assays to assess immune responses in macrophages from different age groups.
- Identification and validation of transcription factors involved in regulating rhythmic immune gene expression.
Main Results:
- Aging significantly disrupts the circadian patterns of macrophage gene expression and immune function.
- The transcription factor KLF4 (Kruppel-Kruppel-like factor 4) was identified as a critical regulator of rhythmic immune gene expression.
- Loss of KLF4 function in aged macrophages correlates with the observed disruption of circadian immune rhythms.
Conclusions:
- Aging impairs the daily rhythms of macrophage immune function.
- KLF4 is essential for maintaining circadian regulation of immune genes in macrophages.
- Restoring KLF4 function may offer a therapeutic strategy to improve age-related immune dysfunction.
