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Related Concept Videos

Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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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Defense Mechanism Against Infection01:26

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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.
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Surface Membrane Barriers01:18

Surface Membrane Barriers

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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
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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,...
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Visualization of Microbiota in Tick Guts by Whole-mount In Situ Hybridization
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Tick gut barriers impacting tick-microbe interactions and pathogen persistence.

Chrysoula Kitsou1, Shelby D Foor1, Shraboni Dutta1

  • 1Department of Veterinary Medicine, University of Maryland, College Park and Virginia-Maryland Regional College of Veterinary Medicine, College Park, Maryland, USA.

Molecular Microbiology
|September 27, 2021
PubMed
Summary

This review explores how tick gut barriers, the peritrophic membrane (PM) and dityrosine network (DTN), influence tick-borne pathogen survival. Understanding these tick-microbe interactions in Ixodes ticks can aid in developing new strategies against Lyme disease.

Keywords:
Borrelia burgdorferiIxodes ticksarthropod vectorsgut barrier

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Area of Science:

  • Vector biology and infectious diseases.
  • Microbial ecology and host-pathogen interactions.
  • Tick physiology and immunology.

Background:

  • Ticks are ancient ectoparasites that transmit numerous pathogens to vertebrates.
  • Tick gut barriers, including the peritrophic membrane (PM) and dityrosine network (DTN), are crucial in regulating microbial presence.
  • Understanding tick-microbe interactions within the gut is vital for controlling tick-borne diseases like Lyme disease.

Purpose of the Study:

  • To review current knowledge on tick gut barriers (PM and DTN) and their role in tick-microbe interactions.
  • To focus on Ixodes ticks, their microbiome, and Borrelia burgdorferi, the agent of Lyme disease.
  • To compare these mechanisms with those in other vectors like mosquitoes.

Main Methods:

  • Literature review of existing research on tick gut structures and microbial interactions.
  • Analysis of the structural and physiological roles of the PM and DTN in Ixodes ticks.
  • Comparative analysis with analogous functions in other arthropod vectors.

Main Results:

  • The PM and DTN form discrete barriers within the tick gut, influencing pathogen survival and dissemination.
  • These gut barriers interact closely with resident tick microbiota and invading pathogens.
  • Ixodes tick gut barriers play a significant role in managing Borrelia burgdorferi, the Lyme disease pathogen.

Conclusions:

  • The PM and DTN are key determinants of tick-microbe interactions and pathogen transmission.
  • Insights into tick gut biology can inform the development of novel strategies to control ticks and tick-borne infections.
  • Further research into these barriers may lead to innovative therapeutic interventions against vector-borne diseases.