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Migration through host cells activates Plasmodium sporozoites for infection.
Maria M Mota1, Julius C R Hafalla, Ana Rodriguez
1Department of Pathology, New York University School of Medicine, New York, New York, USA.
Nature Medicine
|October 16, 2002
Summary
Malaria parasites (Plasmodium sporozoites) must migrate through liver cells before infecting them. This migration activates essential parasite organelles, proving migration is a required step for malaria infection.
Area of Science:
- * Malariology and Parasitology
- * Cell Biology and Host-Pathogen Interactions
Background:
- * Plasmodium sporozoites are the malaria parasite stage transmitted by mosquitoes.
- * Sporozoites infect liver cells (hepatocytes) as part of the malaria life cycle.
- * Sporozoite migration through hepatocytes prior to final infection appears redundant.
Purpose of the Study:
- * To investigate the necessity of Plasmodium sporozoite migration through hepatocytes.
- * To determine the mechanism by which migration facilitates hepatocyte infection.
Main Methods:
- * Observation of Plasmodium sporozoite behavior within host cells.
- * Analysis of sporozoite organelle exocytosis during migration.
- * Comparison of infection rates following active migration versus passive contact.
Main Results:
- * Sporozoite migration through hepatocytes is essential for subsequent infection.
- * Migration, not passive contact, triggers the exocytosis of apical organelles.
- * Apical organelle exocytosis is a prerequisite for vacuole formation and infection.
Conclusions:
- * Hepatocyte migration is a critical, non-redundant step in Plasmodium infection.
- * Migration-induced activation of sporozoite apical organelles is indispensable for the malaria parasite's life cycle.
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