Molecular cross-talk in a unique parasitoid manipulation strategy

Area of Science:

• Neuroethology
• Insect Behavior
• Parasitology

Background:

• The parasitoid Jewel wasp (Ampulex compressa) induces complex, lasting behavioral changes in cockroaches.
• These changes are hypothesized to stem from neurochemical alterations within the cockroach's brain following envenomation.

Purpose of the Study:

• To identify the molecular targets of Jewel wasp venom in cockroach cerebral ganglia.
• To investigate long-term changes in protein expression within the cockroach brain after envenomation.
• To elucidate the mechanisms underlying venom-induced behavioral manipulation.

Main Methods:

• Proteomic analysis using quantitative mass spectrometry to identify venom-protein interactions.
• Characterization of protein abundance changes in cerebral ganglia at various time points post-envenomation.

Main Results:

• Jewel wasp venom components bind to synaptic proteins, interfering with pre- and postsynaptic processes.
• Significant differential expression of numerous proteins was observed in the cerebral ganglia of stung cockroaches.
• Affected proteins are frequently involved in signal transduction pathways, including the Rho GTPase pathway crucial for synaptic plasticity.

Conclusions:

• Jewel wasp venom mediates behavioral control through molecular cross-talk with the cockroach central nervous system.
• The venom induces broad alterations in synaptic efficacy, promoting wasp progeny development.
• These findings reveal a sophisticated mechanism of host manipulation at the molecular level.