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Updated: Aug 10, 2026
In vivo Laser Axotomy in C. elegans
Published on: May 19, 2011
Laser-based killing of a macroparasite inside its live invertebrate host
Olivier Musset1, Aude Balourdet2, Marie-Jeanne Perrot-Minnot2
1Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078, Dijon, France.
Abstract:
Clearing infection is an essential step to address many issues in host-parasite interactions but is challenging when dealing with endoparasites of large size relative to that of their host. Here, we took advantage of the lethality, contactless and versatility of high-energy laser beam to achieve it, using thorny-headed worms (Acanthocephala) and their amphipod intermediate host as a model system. We show that laser-based de-parasitization can be achieved using 450 nm Blue Diode Laser targeting carotenoid pigments in the bird acanthocephalan Polymorphus minutus. Using proboscis evagination failure and DNA degradation to establish parasite death, we found that 80% P. minutus died from within-host exposure to 5 pulses of 50 ms duration, 1.4 W power. Survival of infected gammarids 11 days after laser treatment was 60%. Preliminary tests were also performed with Nanosecond-Green Laser targeting lipids in Pomphorhynchus tereticollis, another acanthocephalan parasite. We discuss the efficiency and side-effect of laser treatment in this host-parasite system and highlight the perspectives that this technology more generally offers in parasitology.
Insights
Laser treatment effectively clears thorny-headed worms (Acanthocephala) from intermediate hosts. This contactless method targets parasite pigments, offering a novel approach to de-parasitization in host-parasite interactions.
Area of Science:
- Parasitology
- Biotechnology
- Laser Physics
Background:
- Clearing endoparasites, especially those large relative to the host, is crucial but challenging in host-parasite interactions.
- Traditional methods for parasite removal can be invasive or ineffective for certain host-parasite systems.
Purpose of the Study:
- To investigate the efficacy of high-energy laser beams for contactless de-parasitization.
- To establish a model system using thorny-headed worms (Acanthocephala) and their amphipod intermediate host to test laser treatment.
Main Methods:
- Utilized a 450 nm Blue Diode Laser targeting carotenoid pigments in *Polymorphus minutus* (acanthocephalan).
- Assessed parasite death via proboscis evagination failure and DNA degradation.
- Exposed parasites to 5 pulses of 50 ms duration at 1.4 W power.
- Conducted preliminary tests with a Nanosecond-Green Laser targeting lipids in *Pomphorhynchus tereticollis*.
Main Results:
- Achieved 80% mortality in *P. minutus* following laser treatment.
- Observed 60% survival rate in infected gammarids 11 days post-treatment.
- Demonstrated the potential of laser technology for de-parasitization in this host-parasite model.
Conclusions:
- Laser-based de-parasitization is a viable and contactless method for clearing acanthocephalan parasites.
- The study highlights the potential of laser technology as a versatile tool in parasitology.
- Further research is warranted to explore efficiency and side-effects across different host-parasite systems.
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