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Release of merozoite dense granules during erythrocyte invasion by Plasmodium knowlesi
M Torii1, J H Adams, L H Miller
1Institute of Pathology, Case Western Reserve University, Cleveland, Ohio 44106.
Abstract:
We used immunoelectron microscopy to study the fate of dense granules during the invasion of erythrocytes by Plasmodium knowlesi merozoites. When merozoites entered host cells, dense granules moved to the pellicle, released their contents into the parasitophorous vacuole space, and then moved into fingerlike channels of the vacuole membrane. This is the first report showing that the content of dense granules of P. knowlesi is different from the contents of rhoptries and micronemes and is associated with the formation of channels from the parasitophorous vacuole.
Insights
Dense granules from Plasmodium knowlesi merozoites release contents into host cells, forming channels. This process differs from rhoptries and micronemes during erythrocyte invasion.
Area of Science:
- Cell biology
- Parasitology
- Microscopy
Background:
- Plasmodium knowlesi causes malaria in humans and other primates.
- Merozoites are the invasive stage of Plasmodium parasites.
- Dense granules are key organelles within merozoites.
Purpose of the Study:
- To investigate the role and fate of dense granules during Plasmodium knowlesi merozoite invasion of erythrocytes.
- To characterize the contents of dense granules and their function.
Main Methods:
- Immunoelectron microscopy was employed to visualize dense granule behavior.
- High-resolution imaging was used to track granule movement and content release.
Main Results:
- Dense granules migrated to the pellicle upon merozoite entry into erythrocytes.
- Granule contents were released into the parasitophorous vacuole.
- Dense granules moved into fingerlike channels of the vacuole membrane.
- P. knowlesi dense granule contents are distinct from rhoptries and micronemes.
Conclusions:
- Dense granules play a unique role in Plasmodium knowlesi invasion, distinct from other secretory organelles.
- The contents of dense granules are associated with the formation of parasitophorous vacuole membrane channels.
- This study provides novel insights into the complex invasion mechanism of Plasmodium parasites.