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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...
Malaria01:29

Malaria

Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
American Trypanosomiasis01:22

American Trypanosomiasis

Chagas disease, or American trypanosomiasis, is a vector-borne parasitic infection caused by Trypanosoma cruzi, a flagellated protozoan (kinetoplastid) of the family Trypanosomatidae. The disease is endemic in Latin America, although cases are increasingly reported worldwide due to human migration. Transmission most commonly occurs when feces of infected triatomine bugs contaminate bite wounds or mucosal surfaces; additional routes include congenital, transfusional, transplant-related, and oral...

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Related Experiment Video

Updated: Jul 3, 2026

Sand Fly (Phlebotomus papatasi) Embryo Microinjection for CRISPR/Cas9 Mutagenesis
05:44

Sand Fly (Phlebotomus papatasi) Embryo Microinjection for CRISPR/Cas9 Mutagenesis

Published on: November 17, 2020

Leishmania sand fly interaction: progress and challenges.

Paul A Bates1

  • 1Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, UK. pbates@liverpool.ac.uk

Current Opinion in Microbiology
|July 16, 2008
PubMed
Summary
This summary is machine-generated.

Leishmania parasites interact with sand fly vectors, utilizing flagellar motility and chemotaxis for gut colonization. These parasites manipulate vector behavior to enhance transmission, even inducing altruistic cell death for spread.

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Last Updated: Jul 3, 2026

Sand Fly (Phlebotomus papatasi) Embryo Microinjection for CRISPR/Cas9 Mutagenesis
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Sand Fly (Phlebotomus papatasi) Embryo Microinjection for CRISPR/Cas9 Mutagenesis

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In Vivo Infection with Leishmania amazonensis to Evaluate Parasite Virulence in Mice
06:57

In Vivo Infection with Leishmania amazonensis to Evaluate Parasite Virulence in Mice

Published on: February 20, 2020

Area of Science:

  • Parasitology and Vector Biology
  • Molecular and Cellular Parasite Biology

Background:

  • Leishmania parasites engage in complex interactions with their sand fly vectors, crucial for disease transmission.
  • Promastigotes, the gut-dwelling stage, possess flagella and exhibit motility, regulated by molecular machinery like kinesins, kinases, and G proteins.

Purpose of the Study:

  • To elucidate the intricate mechanisms governing Leishmania promastigote behavior and interaction within the sand fly vector.
  • To understand how parasites establish infection, differentiate, and manipulate vector behavior for efficient transmission.

Main Methods:

  • Analysis of flagellar assembly regulation involving kinesins, kinases, and G proteins.
  • Investigation of chemo- and osmotaxis mechanisms for directed movement within the vector gut.
  • Study of flagellar attachment to the midgut via surface glyconjugates and parasite-induced vector manipulation.

Main Results:

  • Flagellar motility and regulated assembly are critical for Leishmania promastigotes in the sand fly gut.
  • Parasites exhibit directed movement through chemotaxis and osmotaxis, and utilize flagella for attachment to the midgut.
  • Leishmania undergoes significant differentiation and actively manipulates sand fly behavior, including inducing altruistic forms for transmission.

Conclusions:

  • Leishmania parasites display sophisticated adaptations for survival, colonization, and transmission within the sand fly vector.
  • Understanding these complex host-parasite interactions is key to developing strategies to control leishmaniasis transmission.