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Uptake of Lipids by the Entomophilic Nematode Romanomermis culicivorax
Abstract:
Romanomermis culicivorax juveniles were dissected out of Aedes aegypti larvae 7 days after infection and incubated under controlled conditions in isotonic saline containing a (1)C-labeled fatty acid (palmitic acid), monoacylglycerol (glycerol monoolein), or triacylglycerol (glycerol tripalmate) nutrient source. The mermithid absorbed each of these lipids from the incubation medium, the rate of uptake being greatest for glycerol monoolein. No lipase activity was detected in whole nematode homogenates or in the media in which the nematodes were incubated. It is suggested that the nematode transports complex lipid molecules across its outer cuticle intact.
Insights
Romanomermis culicivorax nematodes absorb lipids intact. Glycerol monoolein showed the highest uptake rate, suggesting direct transport across the cuticle without enzymatic breakdown.
Area of Science:
- Parasitology
- Biochemistry
- Nematology
Background:
- Romanomermis culicivorax is a nematode parasite of mosquito larvae.
- Understanding lipid absorption mechanisms in nematodes is crucial for parasite control strategies.
Purpose of the Study:
- To investigate the uptake and transport of different lipid molecules by Romanomermis culicivorax juveniles.
- To determine if Romanomermis culicivorax possesses lipolytic activity.
Main Methods:
- Juveniles of Romanomermis culicivorax were isolated from infected Aedes aegypti larvae.
- Nematodes were incubated in saline with 14C-labeled fatty acids, monoacylglycerols, or triacylglycerols.
- Lipase activity was assessed in nematode homogenates and incubation media.
Main Results:
- Romanomermis culicivorax juveniles absorbed all tested lipids (fatty acid, monoacylglycerol, triacylglycerol).
- Uptake rate was highest for glycerol monoolein.
- No significant lipase activity was detected in nematodes or their surrounding medium.
Conclusions:
- Romanomermis culicivorax can absorb various lipids from its environment.
- The nematode likely transports intact complex lipid molecules across its cuticle.
- This suggests a direct absorption mechanism rather than extracellular digestion.
