GATA2 controls alveolar macrophage inflammatory gene expression and metabolic function

Area of Science:

• Immunology
• Cell Biology
• Pulmonary Medicine

Background:

• Alveolar macrophages (AMs) maintain lung homeostasis by processing surfactant and possess anti-inflammatory properties.
• GATA transcription factors (TFs) are critical for immune cell development, with GATA2 specifically expressed in lung macrophages.
• GATA2 dysfunction is linked to human chronic lung diseases, but its precise role in AMs is unclear.

Purpose of the Study:

• To investigate the role of GATA2 in regulating the function of alveolar macrophages (AMs).
• To determine how GATA2 deficiency affects AMs' inflammatory and metabolic responses to stimuli.

Main Methods:

• Utilized mice with myeloid-specific deletion of the GATA2 zinc finger domain.
• Analyzed gene expression and performed seahorse metabolic flux analysis on AMs.
• Investigated GATA2-dependent gene networks and TF interactions.

Main Results:

• GATA2 deficiency in AMs led to increased inflammatory gene expression and metabolic dysfunction, especially under type 2 stimuli.
• Homeostatic AM functions were largely preserved, but GATA2 loss exacerbated type 2 response genes during IL-33 inflammation.
• AM metabolism was compromised in GATA2-deficient mice, with affected gene networks involving PU.1 and PPARγ.

Conclusions:

• GATA2 is essential for modulating AM metabolic and transcriptomic programming.
• GATA2 restrains AM inflammatory responses and maintains AM identity during inflammation.
• Dysregulation of GATA2 in AMs may contribute to chronic pulmonary pathologies.