Mechanisms and consequences of persistence of intracellular pathogens: leishmaniasis as an example

Christian Bogdan1

  • 1Microbiology Institute - Clinical Microbiology, Immunology and Hygiene, University Clinic of Erlangen, Erlangen, Germany. christian.bogdan@uk-erlangen.de

Cellular Microbiology
|March 28, 2008
PubMed

Insights

Many intracellular pathogens persist lifelong after infection cure. This study explores mechanisms like host immune modulation and intracellular niche formation, using Leishmania parasites as a model.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Cell Biology

Background:

  • Intracellular pathogens can persist lifelong post-infection.
  • Mechanisms involve host immune evasion and specialized intracellular niches.
  • Leishmania parasites are key models for studying these processes.

Purpose of the Study:

  • To elucidate the complex mechanisms of lifelong pathogen persistence.
  • To understand how intracellular pathogens evade host defenses.
  • To highlight the role of Leishmania in unraveling these survival strategies.

Main Methods:

  • Review of existing literature on intracellular pathogen persistence.
  • Analysis of host-pathogen interactions.
  • Focus on Leishmania as a model organism.

Main Results:

  • Persistence involves passive protection and active immune modulation.
  • Intracellular compartments are remodeled into pathogen "safe niches".
  • Leishmania utilizes diverse strategies for long-term survival.

Conclusions:

  • Lifelong pathogen persistence is a multifaceted phenomenon.
  • Understanding these mechanisms is crucial for developing effective treatments.
  • Leishmania research provides fundamental insights into host-pathogen dynamics.

Related Concept Videos

Leishmaniasis01:30

Leishmaniasis

Leishmaniasis is a protozoal disease caused by species of the genus Leishmania and transmitted through the bite of infected female sandflies. The parasite exists in two principal morphological forms during its life cycle. A sandfly acquires intracellular amastigotes from an infected reservoir host, such as a dog. Within the sandfly, these forms differentiate into motile, flagellated promastigotes. During a subsequent blood meal, promastigotes are injected into the human host, where they...
Antiprotozoal Agents01:21

Antiprotozoal Agents

Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
Colonisation of Pathogens01:25

Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Infection01:20

Infection

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.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...