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Related Concept Videos

Microorganisms in Medicine and Therapeutics01:29

Microorganisms in Medicine and Therapeutics

Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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
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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...
Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
Inflammatory Response01:28

Inflammatory Response

An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...

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Immunometabolic Circuits in Infection for Advancing Host Directed Therapies
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Published on: September 13, 2024

Modulating immunity as a therapy for bacterial infections.

Robert E W Hancock1, Anastasia Nijnik, Dana J Philpott

  • 1Department of Microbiology and Immunology, Centre for Microbial Diseases and Immunity Research, Room 232, 2259 Lower Mall Research Station, University of British Columbia, Vancouver, V6T 1Z4 British Columbia, Canada. bob@hancocklab.com

Nature Reviews. Microbiology
|March 17, 2012
PubMed
Summary

Antimicrobial resistance is rising as new antibiotic discovery declines. Host-directed immunomodulatory therapies offer a promising alternative by enhancing the immune system to fight infections and reduce tissue damage.

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Area of Science:

  • Microbiology
  • Immunology
  • Pharmacology

Background:

  • Antimicrobial resistance (AMR) is a growing global health threat, driven by increasing bacterial resistance to existing drugs.
  • The discovery rate of new antibiotics has significantly declined, creating an urgent need for novel anti-infective strategies.

Purpose of the Study:

  • To explore alternative therapeutic paradigms beyond traditional antibiotics.
  • To investigate host-directed immunomodulatory therapies as a promising approach to combat infections.
  • To enhance the host's natural immune mechanisms for therapeutic benefit while minimizing inflammation-induced tissue injury.

Main Methods:

  • Exploiting natural host defense mechanisms.
  • Utilizing immunomodulatory agents to stimulate or initiate protective immunity.
  • Investigating potential immune modulators such as innate defense regulator peptides.
  • Exploring agonists of innate immune components like Toll-like receptors (TLRs) and NOD-like receptors (NLRs).

Main Results:

  • Host-directed immunomodulatory therapies can enhance antimicrobial immunity.
  • These therapies aim to limit inflammation-induced tissue damage.
  • Innate defense regulator peptides and TLR/NLR agonists are potential candidates for immune modulation.

Conclusions:

  • Host-directed immunomodulatory therapies represent a vital new paradigm for anti-infective treatment.
  • These approaches leverage the host's immune system to overcome antimicrobial resistance.
  • Further research into immune modulators is essential for developing next-generation anti-infective treatments.