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Related Concept Videos

Caspases01:24

Caspases

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Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
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Bacterial Toxins01:12

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Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
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The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
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The Intrinsic Apoptotic Pathway01:31

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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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CRISPR and crRNAs02:53

CRISPR and crRNAs

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

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Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
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Related Experiment Video

Updated: Apr 23, 2026

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Bacterial secreted effectors and caspase-3 interactions.

Daniel M Wall1, Beth A McCormick

  • 1Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G12 8QQ, UK.

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Summary

Pathogenic bacteria can subvert apoptosis by targeting caspase-3, an enzyme crucial for cell death and other functions. Understanding these interactions is key to developing new infection treatments.

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Area of Science:

  • Cellular biology
  • Microbiology
  • Immunology

Background:

  • Apoptosis, or programmed cell death, is vital for organism survival and defense.
  • Apoptotic caspases, particularly caspase-3, execute cell disassembly and have roles beyond cell death.
  • Pathogenic bacteria can interact with host caspases, influencing infection dynamics.

Purpose of the Study:

  • To review how bacterial pathogens interact with and subvert caspase-3.
  • To highlight the significance of these interactions in host-pathogen dynamics.
  • To explore bacterial strategies for manipulating caspase-3 activity.

Main Methods:

  • Literature review of studies on bacterial pathogenesis and apoptosis.
  • Analysis of effector proteins and modulated pathways involved in caspase-3 interaction.
  • Synthesis of current knowledge on bacterial subversion of caspase-3.

Main Results:

  • Bacterial pathogens have evolved mechanisms to interfere with caspase-3.
  • These mechanisms include direct interaction via effector proteins and indirect modulation of caspase-3 pathways.
  • Bacterial subversion of caspase-3 impacts host cell survival and bacterial persistence.

Conclusions:

  • Bacterial interactions with caspase-3 are significant in infectious diseases.
  • Targeting caspase-3 is a key strategy for bacterial pathogens.
  • Further research into these interactions may reveal novel therapeutic targets.