Related Experiment Video
Updated: Sep 5, 2025
08:22
Studying Copper Nanoparticle-Induced Programmed Cell Death in Bacteria
Published on: May 16, 2025
234
NAD+ depletion and defense in bacteria
Meng Wang1, Qing Ji2, Peng Liu3
1College of Forestry, Southwest Forestry University, Kunming 650224, Yunnan, China.
Trends in Microbiology
|July 8, 2022
Summary
Nicotinamide adenine dinucleotide (NAD+) depletion is key to immune-mediated cell death in all life. Bacteria utilize NAD+ depletion to defend against phages, offering clues to the evolution of this process in eukaryotes.
Area of Science:
- Cellular Biology
- Immunology
- Microbiology
Background:
- Nicotinamide adenine dinucleotide (NAD+) regulates cellular energy metabolism.
- NAD+ depletion is a conserved mechanism in immune-mediated cell death (ICD).
Purpose of the Study:
- To investigate the role of NAD+ depletion in bacterial defense against phages.
- To explore evolutionary links between prokaryotic and eukaryotic ICD.
Main Methods:
- Analysis of bacterial defense mechanisms against phage infection.
- Comparative study of NAD+ metabolism in prokaryotes and eukaryotes.
Main Results:
- Bacteria employ NAD+ depletion as a protective strategy against phage predation.
- This bacterial mechanism provides a model for understanding eukaryotic ICD evolution.
Conclusions:
- Bacterial NAD+ depletion offers insights into the evolutionary origins of eukaryotic immune-mediated cell death.
- Understanding these pathways can inform future research in immunology and cellular metabolism.
Related Concept Videos
01:31Defense Against Bacterial Pathogens
1.5K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.5K
01:26Defense Mechanism Against Infection
7.2K
Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
7.2K
01:23Antimicrobial Proteins
4.7K
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
4.7K
01:23Stringent Response in E. coli
49
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
49
01:30Development of Antibiotic Resistance
191
Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
191
01:30Other Stress Responses in Bacteria
60
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
60