Glucose transport in Acanthocheilonema viteae

Area of Science:

• Parasitology and Biochemistry
• Molecular and Cellular Biology

Background:

• Glucose uptake is essential for parasitic helminths.
• Understanding filarial glucose transport mechanisms is crucial for developing novel anti-parasitic strategies.
• Acanthocheilonema viteae is a filarial nematode parasite.

Purpose of the Study:

• To characterize the glucose transport system in Acanthocheilonema viteae.
• To investigate the potential of targeting filarial glucose transport as a chemotherapeutic approach.

Main Methods:

• In vitro study of glucose uptake kinetics in Acanthocheilonema viteae.
• Assay of glucose transporter inhibition using various chemical agents.
• Evaluation of worm viability and motility under glucose-deprived conditions.
• Assessment of worm survival post-incubation in glucose-free media and subsequent implantation.

Main Results:

• Glucose uptake in Acanthocheilonema viteae is stereoselective for the D-isomer and saturable (Km = 2 mM).
• Transport was inhibited by 2-deoxyglucose, mannose, 5-thioglucose, and dipyridamole.
• Unlike mammalian systems, filarial glucose transport was not inhibited by cytochalasin B, phloretin, phloridzin, 3-O-methylglucose, and 4,6-ethylideneglucose, indicating a distinct glucose transporter.
• Glucose deprivation led to glycogen depletion, loss of motility, and worm death.
• Worms incubated without glucose for over 18 hours did not survive implantation.

Conclusions:

• The glucose transporter in Acanthocheilonema viteae differs significantly from those in mammalian systems.
• Selective inhibition of filarial glucose transport presents a promising chemotherapeutic strategy.
• Disruption of glucose metabolism is lethal to Acanthocheilonema viteae, highlighting its essential role in parasite survival.