Molecular pathogenesis of pneumococcal pneumonia

J A McCullers1, E I Tuomanen

  • 1Department of Infectious Diseases, St. Jude Children's, Research Hospital, 332 N. Lauderdale Street, Memphis, TN 38105, USA. jon.mccullers@stjude.org

Insights

Recent advances in understanding Streptococcus pneumoniae pathogenesis offer new strategies against this pneumonia-causing bacterium. Insights into its molecular mechanisms and host interactions inform novel therapeutic and vaccine development.

Area of Science:

  • Microbiology
  • Immunology
  • Pathogenesis

Background:

  • Streptococcus pneumoniae is a major cause of pneumonia.
  • Decades of research have expanded knowledge of its molecular pathogenesis.
  • Understanding host-pathogen interactions is crucial for developing effective treatments.

Purpose of the Study:

  • To review recent advances in understanding S. pneumoniae pathogenesis.
  • To highlight common themes in respiratory pathogen research.
  • To inform the development of novel therapeutic and vaccine strategies.

Main Methods:

  • Review of molecular pathogenesis data.
  • Analysis of gene and protein functions.
  • Elucidation of adherence, colonization, inflammation, and invasion mechanisms.

Main Results:

  • Detailed understanding of S. pneumoniae's molecular mechanisms.
  • Insights into host-pathogen interactions.
  • Identification of potential targets for small molecule and vaccine-based strategies.

Conclusions:

  • Advances in S. pneumoniae pathogenesis research provide new avenues for treatment.
  • Knowledge gained can be applied to other respiratory pathogens like Haemophilus influenzae and Neisseria meningitidis.

Related Concept Videos

Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation, but...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:
Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...
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...
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...