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An Introduction to Parasitic Wasps of Drosophila and the Antiparasite Immune Response
Published on: May 7, 2012
Modulation of immune responses to parasitoids by polydnaviruses
1Department of Entomology, University of California-Riverside 92521, USA.
Parasitology
|August 8, 1998
Summary
Parasitoid wasps inject polydnaviruses into hosts, suppressing the immune system. This allows wasp larvae to develop by preventing host immune cells, like haemocytes, from attacking.
Area of Science:
- Insect immunology
- Virology
- Parasitology
Background:
- Parasitoids are insects that kill their hosts.
- Polydnaviruses are crucial for parasitoid survival, as they are injected into hosts to suppress immune responses.
- Host haemocytes are key targets of polydnaviruses, leading to significant immune alterations.
Purpose of the Study:
- To investigate the impact of polydnaviruses on host haemocytes and immune function.
- To understand how polydnaviruses facilitate parasitoid development by evading host immunity.
Main Methods:
- Analysis of haemocyte morphology and function following polydnavirus infection.
- Assessment of phenoloxidase activity in parasitized hosts.
- Identification of specific polydnavirus gene products affecting haemocyte behavior.
Main Results:
- Polydnaviruses induce diverse effects on haemocytes, including apoptosis, clumping, or altered adhesion.
- Phenoloxidase activity is inhibited by polydnavirus infection, a process that can be induced.
- Synergistic effects between venom and polydnavirus components may enhance immune suppression.
Conclusions:
- Polydnaviruses are potent modulators of insect host immunity, specifically targeting haemocytes.
- These viral mechanisms are essential for parasitoid success, enabling development by subverting host immune defenses.
