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Leishmania infection: surfaces and immunity.

E P Wright1, E R el Amin

  • 1Department of International Education, Royal Tropical Institute, Amsterdam, The Netherlands.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|September 1, 1989
PubMed
Summary

Leishmania parasites infect macrophages using surface molecules like gp63 and lipophosphoglycan for cell entry and survival. Understanding these interactions is key to fighting leishmaniasis infections.

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Area of Science:

  • Parasitology
  • Immunology
  • Cell Biology

Background:

  • Leishmania infections begin with sandfly bites, introducing parasites that invade macrophages.
  • The mechanisms of parasite entry and intracellular survival remain incompletely understood.
  • Parasite surface molecules are crucial for host cell interaction and infectivity.

Purpose of the Study:

  • To elucidate the roles of Leishmania surface molecules in macrophage invasion and intracellular survival.
  • To discuss the interactions between parasite surface components and macrophage receptors.
  • To briefly describe immune responses relevant to leishmaniasis diagnosis and control.

Main Methods:

  • Analysis of Leishmania surface molecules, including promastigote surface protease (gp63) and lipophosphoglycan.
  • Discussion of molecular interactions with macrophage receptors (mannose, fucose, complement).
  • Review of immune responses in infected humans and experimental animals.

Main Results:

  • gp63 facilitates macrophage binding via mannose, fucose, and complement receptors.
  • Lipophosphoglycan activates complement, aiding parasite attachment to macrophages.
  • Other surface structures (acid phosphatase, glycolipids, membrane proteins) may aid attachment and intracellular survival by inhibiting host enzymes.

Conclusions:

  • Leishmania surface molecules are critical for both initial host cell invasion and subsequent intracellular persistence.
  • Understanding these molecular interactions provides insights into parasite pathogenesis.
  • Immune responses to parasite antigens are important for protection, diagnosis, and epidemiology of leishmaniasis.

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