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Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondria: a target for bacteria.

Elodie Lobet1, Jean-Jacques Letesson2, Thierry Arnould1

  • 1Laboratory of Biochemistry and Cellular Biology (URBC), NAmur Research Institute for LIfe Science (NARILIS), University of Namur, 61 Rue de Bruxelles, 5000 Namur, Belgium.

Biochemical Pharmacology
|February 25, 2015
PubMed
Summary
This summary is machine-generated.

Bacteria target mitochondria, crucial for innate immunity and cell signaling, to establish infections. This review details how pathogens manipulate mitochondrial functions like calcium balance and redox status for survival.

Keywords:
BacteriaCalciumImmunityMetabolismMitochondriamtROS

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Area of Science:

  • Cell Biology
  • Immunology
  • Microbiology

Background:

  • Eukaryotic cells possess innate immune systems to detect and eliminate pathogens through pattern recognition receptors.
  • Pathogens have evolved mechanisms to evade or subvert these immune responses, enabling host cell invasion and persistence.
  • Mitochondria play critical roles in cellular metabolism, signaling (ROS, calcium), and cell death, making them key targets for bacterial manipulation.

Purpose of the Study:

  • To review the diverse functions of mitochondria that are impacted during bacterial infections.
  • To explore the strategies employed by bacterial pathogens to subvert mitochondrial functions.
  • To highlight the intricate relationship between bacteria and mitochondria in the context of host-pathogen interactions.

Main Methods:

  • Literature review focusing on bacterial manipulation of mitochondrial functions.
  • Analysis of pathogen strategies targeting calcium homeostasis, redox status, and mitochondrial morphology.
  • Synthesis of current knowledge on host-pathogen interactions at the mitochondrial level.

Main Results:

  • Bacterial pathogens actively target mitochondria to disrupt host defenses and promote their survival.
  • Specific bacterial effectors interfere with mitochondrial calcium uptake and release, altering signaling pathways.
  • Pathogens manipulate mitochondrial redox balance and morphology to evade immune detection and facilitate replication.

Conclusions:

  • Mitochondria are central players in the innate immune response and are frequently targeted by bacterial pathogens.
  • Understanding how bacteria subvert mitochondrial functions provides insights into infection pathogenesis.
  • Targeting mitochondrial pathways could offer novel therapeutic strategies against bacterial infections.