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Updated: Jun 15, 2025

In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure
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Role of Mitofusin 1 in mediating reactive oxygen species in alveolar macrophages during Streptococcuspneumoniae

David Thomas1, Jianjun Yang2, Soo Jung Cho1

  • 1Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, USA; New York-Presbyterian Hospital, New York, NY, USA.

Redox Biology
|August 28, 2024
PubMed

Insights

Mitochondrin protein 1 (Mfn1) deficiency in alveolar macrophages reduces lung inflammation and injury during Streptococcus pneumoniae infection by controlling reactive oxygen species (ROS). This finding highlights Mfn1

Area of Science:

  • Immunology
  • Cell Biology
  • Mitochondrial Dynamics

Background:

  • Alveolar macrophages (AMs) are crucial for host defense against Streptococcus pneumoniae.
  • Mitochondria regulate vital cellular processes including innate immunity and redox signaling.
  • Stress-induced mitochondrial hyperfusion (SIMH) is a response to cellular stress.

Purpose of the Study:

  • To investigate the role of Mitofusin 1 (Mfn1) in regulating reactive oxygen species (ROS) within AMs.
  • To determine the impact of Mfn1 deficiency on the immune response to S. pneumoniae infection.

Main Methods:

  • Histological analysis of lung tissue from Mfn1 deficient (Mfn1Floxed; CreLysM) and control (Mfn1FloxCre-) mice.
  • Assessment of reactive oxygen species (ROS) production, lipid peroxidation, and antioxidant activity in Mfn1 deficient AMs.

Main Results:

  • Mfn1 deficiency in myeloid cells led to reduced lung tissue injury and inflammation compared to controls.
  • Mfn1 deficient AMs exhibited significantly decreased lipid peroxidation and ROS production.
  • Increased superoxide dismutase (SOD) activity and overall antioxidant capacity were observed in Mfn1 deficient AMs.

Conclusions:

  • Mfn1 plays a critical role in regulating mitochondrial function and ROS production in AMs.
  • Mfn1 deficiency in myeloid cells confers protection against S. pneumoniae-induced lung inflammation and injury.
  • Targeting Mfn1 may represent a therapeutic strategy for bacterial pneumonia.

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