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Related Concept Videos

Bacterial Toxins01:12

Bacterial Toxins

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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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Receptor-mediated Endocytosis01:20

Receptor-mediated Endocytosis

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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
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Diphtheria01:28

Diphtheria

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Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...
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Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

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Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid...
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Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

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Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous...
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Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy
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Anthrax lethal and edema toxins in anthrax pathogenesis.

Shihui Liu1, Mahtab Moayeri1, Stephen H Leppla1

  • 1Microbial Pathogenesis Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.

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Bacillus anthracis exotoxins cause anthrax by targeting the CMG2 receptor. This review details anthrax toxin activities and their roles in disease progression.

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Area of Science:

  • Microbiology
  • Pathogenesis
  • Toxicology

Background:

  • Bacterial infections often cause disease through released exotoxins.
  • Bacillus anthracis, a spore-forming bacterium, causes anthrax via infection and toxemia.
  • Anthrax is a significant public health concern and bioterrorism threat.

Purpose of the Study:

  • To review the activities of anthrax toxins.
  • To elucidate the roles of anthrax toxins in early and late stages of infection.

Main Methods:

  • Literature review of anthrax toxin research.
  • Analysis of toxin-receptor interactions.

Main Results:

  • Anthrax toxins are crucial for pathogenesis.
  • Capillary morphogenesis protein 2 (CMG2) is the primary receptor for these toxins.
  • Toxins play roles throughout the disease course.

Conclusions:

  • Understanding anthrax toxin mechanisms is vital for combating the disease.
  • Targeting toxin-receptor interactions may offer therapeutic strategies.