Mind-controlling peptides in the venom of wasp
- The venom of the wasp Ampulex compressa is a potential therapy for Parkinson's disease.
- The venom when injected into the brain and subesophageal ganglion of a cockroach resulted in Hypokinesia.
- Hypokinesia is a total or partial loss of movement due to disruption in the brain.
A new family of peptides in the venom of the wasp Ampulex compressa, when injected into the brain of a cockroach, could control the mind of the cockroach, and might even help researchers develop better Parkinson's disease treatments.
After being stung by a parasitic wasp, the American cockroach loses control of its behavior, becoming host to the wasp's egg. Days later, the hatchling consumes the cockroach alive.
‘The venom of the wasp Ampulex compressa could cause Hypokinesia in cockroaches. Scientists are now finding a way to use this venom for treatment of Parkinsonís disease.’
Scientists have long studied venoms, such as that of the wasp, seeking out novel and potent molecules to treat disease, among other applications. In the case of the enigmatic wasp Ampulex compressa, it uses its venom in a two-pronged approach against the cockroach, with an initial sting to the thorax to paralyze the front legs and a subsequent sting directly to the brain.
This second sting causes the roach first to vigorously groom itself, then to fall into a state of lethargy, allowing the wasp to do whatever it wants. This immobile state resembles symptoms of Parkinson's disease, and both may be related to dysfunction in the dopamine pathway. In this study, Michael E. Adams and colleagues wanted to identify the ingredients in wasp venom that dictate this behavior.
Peptides called ampulexins have the power to immobilize
The researchers milked wasps for their venom and then analyzed the components using liquid chromatography and mass spectrometry. They identified a new family of alpha-helical peptides and named them ampulexins. To test their function, the team injected the most abundant venom peptide into cockroaches.
Afterward, the bugs needed, on average, a 13-volt electric shock to the foot to get them moving, while an average of 9 volts sufficed prior to the injection, suggesting the peptides help the wasp immobilize its prey. Future work will focus on identifying cellular targets of ampulexins, and potentially generating a useful animal model for the study of Parkinson's disease treatments.
- Eugene Moore, Ryan Arvidson et al. Ampulexins: A New Family of Peptides in Venom of the Emerald Jewel Wasp, Ampulex compressa, Biochemistry DOI: 10.1021/acs.biochem.7b00916