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Identification of a fibronectin-like molecule on the surface of Leishmania amastigotes
E Del Cacho1, J Quilez, F Lopez-Bernad
1Department of Animal Pathology, Faculty of Veterinary Sciences, University of Zaragoza, Spain.
Abstract:
The major surface glycoprotein of Leishmania gp63, a fibronectin-like molecule, plays a key role in parasite-macrophage interaction. In this article, we describe a cross-reactivity between an anti-fibronectin monoclonal antibody and the amastigote gp63 by means of immunoelectron microscopy and immunoblot. Immunoreactivity was found on the amastigote membrane and in the flagellar pocket. We suggest that gp63 may play a role in the protection and/or nutrition process of the parasite in the phagolysosomes of the macrophage.
Insights
Leishmania gp63, a surface glycoprotein, interacts with macrophages. Researchers found cross-reactivity between anti-fibronectin antibodies and amastigote gp63, suggesting a role in parasite survival within macrophages.
Area of Science:
- Parasitology
- Immunology
- Cell Biology
Background:
- Leishmania gp63 is a major surface glycoprotein crucial for parasite-macrophage interactions.
- gp63 exhibits fibronectin-like properties, influencing host cell engagement.
Purpose of the Study:
- To investigate the cross-reactivity between an anti-fibronectin monoclonal antibody and Leishmania amastigote gp63.
- To elucidate the localization and potential function of gp63 in the parasite's interaction with macrophages.
Main Methods:
- Immunoelectron microscopy was employed to visualize the location of gp63.
- Immunoblotting techniques were used to confirm the cross-reactivity.
Main Results:
- A significant cross-reactivity was observed between the anti-fibronectin antibody and amastigote gp63.
- Immunoreactivity was detected on the amastigote cell membrane and within the flagellar pocket.
Conclusions:
- The findings suggest that Leishmania gp63 shares epitopes with fibronectin.
- gp63 may be involved in protecting the parasite or facilitating nutrient uptake within the macrophage phagolysosome.