Growth of Chlamydia pneumoniae Is Enhanced in Cells with Impaired Mitochondrial Function

Area of Science:

• Cell Biology
• Microbiology
• Mitochondrial Biology

Background:

• Obligate intracellular pathogen replication relies on host cell metabolism.
• The link between host mitochondrial function and pathogen growth is largely unexplored.
• Chlamydia pneumoniae growth is enhanced in low oxygen, suggesting a role for mitochondrial respiration.

Purpose of the Study:

• To investigate the impact of host cell mitochondrial function on Chlamydia pneumoniae replication.
• To analyze metabolic changes in infected epithelial cells under normoxic and hypoxic conditions.

Main Methods:

• Epithelial cells infected with Chlamydia pneumoniae were cultured under normoxic and hypoxic conditions.
• Mitochondrial membrane potential and ROS generation were measured.
• Host cell ATP synthase was inhibited via knockdown and mutation.

Main Results:

• Chlamydia pneumoniae infection impaired mitochondrial function under normoxia, increasing membrane potential and ROS.
• Inhibition of host ATP synthase significantly increased chlamydial replication under normoxia.
• Mitochondrial hyperpolarization under hypoxia benefited Chlamydia pneumoniae growth.

Conclusions:

• Functional and genetic mitochondrial dysfunction promotes intracellular Chlamydia pneumoniae growth.
• Targeting host mitochondrial pathways could be a strategy against Chlamydia pneumoniae infections.