Legionella and mitochondria, an intriguing relationship

Area of Science:

• Microbiology
• Cell Biology
• Pathogenesis

Background:

• Legionella pneumophila is the primary cause of Legionnaires' disease, a severe form of pneumonia.
• This intracellular bacterium infects human macrophages, utilizing a type-IV-secretion-system (T4SS) to deliver over 300 effector proteins.
• These effectors manipulate host cell processes and organelles to facilitate the pathogen's intracellular lifecycle.

Approach:

• This review synthesizes current research on the interactions between L. pneumophila and host cell mitochondria.
• It focuses on the mechanisms by which T4SS effectors target mitochondrial functions.
• The discussion covers mitochondria's roles in cellular bioenergetics, immunity, and cell death during infection.

Key Points:

• L. pneumophila extensively interacts with mitochondria, a central organelle in cellular energy production and immune responses.
• T4SS effectors are key virulence factors that actively subvert mitochondrial functions.
• These targeted manipulations aid the bacterium in establishing and maintaining intracellular infection.

Conclusions:

• Mitochondria are critical targets for L. pneumophila virulence strategies.
• Understanding these interactions provides insights into host-pathogen dynamics and potential therapeutic targets.
• The hijacking of mitochondrial functions is essential for L. pneumophila's intracellular survival and pathogenesis.