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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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Mycobacteria and Macrophage Apoptosis: Complex Struggle for Survival.

Luiz E Bermudez1, Lia Danelishvili2, Julie Early3

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Mycobacterium avium infection causes macrophages to undergo apoptosis, while Mycobacterium tuberculosis infection leads to necrosis instead of apoptosis. This difference in cell death pathways impacts disease progression.

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Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Macrophages are key immune cells involved in host defense against microbial pathogens.
  • Different Mycobacterium species can induce distinct cellular responses, influencing disease outcomes.

Purpose of the Study:

  • To investigate and compare the effects of Mycobacterium avium and Mycobacterium tuberculosis infection on macrophage cell death pathways.
  • To elucidate the mechanisms by which these distinct mycobacterial species manipulate host cell fate.

Main Methods:

  • Macrophage cell cultures were infected with Mycobacterium avium or Mycobacterium tuberculosis.
  • Apoptosis and necrosis were assessed using specific cell death assays.
  • Gene expression analysis was performed to identify involved signaling pathways.

Main Results:

  • Mycobacterium avium infection induced significant apoptosis in macrophages.
  • Mycobacterium tuberculosis infection suppressed apoptosis and promoted necrosis in infected macrophages.
  • Distinct molecular mechanisms underlie the differential induction of cell death by these two species.

Conclusions:

  • Mycobacterium avium and Mycobacterium tuberculosis trigger divergent cell death programs in macrophages.
  • The ability of Mycobacterium tuberculosis to evade apoptosis and induce necrosis is a critical factor in its pathogenesis.
  • Understanding these differences can inform therapeutic strategies against mycobacterial infections.