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The effect of irradiation on the third stage larvae of Brugia pahangi
E Devaney1, A Bancroft, A Egan
1Department of Parasitology, Liverpool School of Tropical Medicine, UK.
Abstract:
The effect of irradiation on the third stage larvae of the filarial nematode Brugia pahangi was investigated. Labelling with 35S methionine of control or irradiated L3, post-infective L3 or L4 revealed no consistent alterations in the pattern of proteins synthesized. The only significant difference observed was in 125I labelling, where the specific activity of labelling of soluble cuticular proteins was lower in irradiated than in control parasites. This difference may be related to the reduced size of irradiated parasites rather than to a specific effect of irradiation on the expression of cuticular proteins. Irradiated parasites recovered on day 14 post-infection were significantly shorter than control parasites. Irradiation also appeared to have a lethal effect on male parasites, as no recognizable males were recovered from animals given irradiated L3, nor were microfilariae ever observed in these animals. The mechanisms by which irradiation may enhance the immunogenicity of L3 of filarial nematodes are discussed.
Insights
Irradiation of Brugia pahangi larvae reduced parasite size and proved lethal to males, suggesting potential for enhanced immunogenicity in filarial nematode control. Microfilariae were not observed after treatment.
Area of Science:
- Parasitology
- Molecular Biology
- Immunology
Background:
- Filarial nematodes, such as Brugia pahangi, cause significant human and animal diseases.
- Irradiation is explored as a method to attenuate parasites for vaccine development.
- Understanding the molecular and morphological effects of irradiation is crucial for its application.
Purpose of the Study:
- To investigate the effects of irradiation on third-stage larvae (L3) of Brugia pahangi.
- To assess alterations in protein synthesis and cuticular protein labeling post-irradiation.
- To evaluate the impact of irradiation on parasite survival, morphology, and infectivity.
Main Methods:
- Third-stage larvae (L3) of Brugia pahangi were subjected to irradiation.
- Protein synthesis patterns were analyzed using 35S methionine labeling.
- Cuticular protein labeling was assessed using 125I labeling; parasite size and sex were determined post-infection.
Main Results:
- No consistent alterations in protein synthesis patterns were observed between control and irradiated larvae.
- A lower specific activity of 125I labeling in soluble cuticular proteins of irradiated parasites was noted, likely due to reduced parasite size.
- Irradiated parasites were significantly shorter, and irradiation exhibited a lethal effect on male parasites, preventing microfilaremia.
Conclusions:
- Irradiation of Brugia pahangi L3 leads to reduced parasite size and male-specific lethality.
- These effects suggest that irradiation may enhance the immunogenicity of filarial nematode larvae.
- Further research into the mechanisms of irradiation-induced immunogenicity is warranted for developing novel control strategies.
