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Related Concept Videos

Streptococcal Pharyngitis01:27

Streptococcal Pharyngitis

Streptococcal pharyngitis, commonly known as “strep throat,” is an acute infection of the oropharyngeal tissues caused by the Gram‑positive Group A Streptococcus (Streptococcus pyogenes). Transmission occurs primarily through respiratory droplets expelled during coughing, sneezing, or talking.Mechanisms of Host Entry and Immune EvasionUpon entering the host, S. pyogenes adheres to the mucosal epithelial cells of the pharynx via surface proteins, notably lipoteichoic acid and the antiphagocytic...
Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

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...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
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Bacterial Toxins

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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Updated: Jul 2, 2026

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
09:25

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

Published on: August 19, 2016

Molecular mechanisms underlying group A streptococcal pathogenesis.

Randall J Olsen1, Samuel A Shelburne, James M Musser

  • 1Center for Molecular and Translational Human Infectious Disease Research, The Methodist Hospital Research Institute, Houston, TX 77030, USA.

Cellular Microbiology
|August 20, 2008
PubMed
Summary

Group A Streptococcus (GAS) causes various infections. New models and technologies reveal how GAS interacts with hosts, aiding the development of new treatments for this common pathogen.

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A Murine Model of Group B Streptococcus Vaginal Colonization
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A Murine Model of Group B Streptococcus Vaginal Colonization

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Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
09:25

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

Published on: August 19, 2016

A Murine Model of Group B Streptococcus Vaginal Colonization
10:19

A Murine Model of Group B Streptococcus Vaginal Colonization

Published on: November 16, 2016

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pathogenesis

Background:

  • Group A Streptococcus (GAS) is a significant human pathogen responsible for a spectrum of diseases, from mild mucosal infections to severe invasive conditions.
  • Understanding GAS host-pathogen interactions is crucial for developing effective countermeasures.

Purpose of the Study:

  • To summarize recent advancements in understanding GAS pathogenesis.
  • To highlight the role of new technologies and animal models in accelerating discoveries.
  • To identify potential targets for novel preventive or therapeutic agents.

Main Methods:

  • Review of recent research on GAS host-pathogen interactions.
  • Focus on newly identified GAS surface structures (pili) and their function in adherence.
  • Utilizing a transgenic mouse model expressing human plasminogen to study invasive disease.

Main Results:

  • GAS pili are identified as key factors for adherence to eukaryotic cells.
  • A transgenic mouse model has provided new insights into the molecular mechanisms of invasive GAS infection.
  • Advances in technology have significantly improved the study of GAS-host interactions.

Conclusions:

  • Improved understanding of GAS pathogenesis, particularly molecular mechanisms, is essential.
  • These discoveries pave the way for developing novel strategies against GAS infections.
  • Further research into GAS host-pathogen interactions promises new therapeutic and preventive options.