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Do Plasmodium ookinetes invade a specific cell type in the mosquito midgut?
1Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. mshahabudd@niaid.nih.gov
Trends in Parasitology
|May 10, 2002
Summary
Plasmodium ookinete invasion of mosquito midguts is debated. While some studies suggest parasites prefer specific cells (Ross cells), recent evidence indicates all midgut cells appear similar, challenging this invasion hypothesis.
Area of Science:
- Vector biology
- Parasitology
- Cell biology
Background:
- The Plasmodium ookinete's invasion mechanism across the mosquito midgut epithelium is under investigation.
- Previous research suggested Plasmodium gallinaceum ookinetes target a specific cell type, the 'Ross cell,' in Aedes aegypti mosquitoes.
- This hypothesis is based on the described complexity and diversity of mosquito midgut cell types.
Purpose of the Study:
- To critically evaluate the 'Ross cell' hypothesis regarding Plasmodium ookinete invasion.
- To reconcile conflicting observations on mosquito midgut cell structure and parasite invasion patterns.
Main Methods:
- Review and discussion of recent publications presenting microscopy-based observations of mosquito midgut epithelial cells.
- Analysis of differential interference contrast microscopy findings in uninfected mosquitoes.
Main Results:
- Recent studies using differential interference contrast microscopy found that all midgut epithelial cells in uninfected mosquitoes appear structurally uniform.
- This contradicts earlier proposals of distinct cell types being preferred for parasite invasion.
Conclusions:
- The structural similarity of midgut epithelial cells challenges the 'Ross cell' hypothesis.
- Further research is needed to fully understand the specificity, if any, of Plasmodium ookinete invasion in mosquitoes.