Comparative glucose utilization rates in separated and mated schistosomes.

Area of Science:

• Biochemistry
• Parasitology
• Molecular Biology

Background:

• Schistosomes are parasitic flatworms responsible for schistosomiasis.
• Understanding their metabolic pathways, particularly glucose utilization, is crucial for developing treatments.

Purpose of the Study:

• To determine the phosphorylation rate of 2-deoxyglucose (2DG) in different schistosome species.
• To investigate the influence of mating status on glucose and 2DG phosphorylation and utilization.

Main Methods:

• Sequential pulsing of schistosomes (Schistosoma mansoni, S. japonicum, S. haematobium) with 3H- and 14C-labeled 2-deoxy-D-glucose.
• Column chromatography to separate phosphorylated and unphosphorylated 2DG.
• Measurement of phosphorylation rates and phosphorylation coefficients for 2DG and glucose.

Main Results:

• 2-deoxyglucose (2DG) uptake is faster than glucose, but its phosphorylation rate is significantly slower in S. mansoni and S. japonicum.
• Mated male and female schistosomes exhibit higher rates of 2DG and glucose phosphorylation compared to unmated or separated individuals.
• The phosphorylation coefficient for 2DG is higher in separated than in mated schistosomes.
• Glucose utilization rates vary among species, being highest in S. japonicum, intermediate in S. mansoni, and lowest in S. haematobium at low substrate concentrations.

Conclusions:

• Schistosome phosphorylation of 2DG is slower than that of glucose, suggesting distinct metabolic regulation.
• Reproductive status significantly impacts glucose and 2DG metabolism in schistosomes.
• Species-specific differences in glucose utilization highlight the complexity of schistosome energy metabolism.