Targeting pathogen metabolism without collateral damage to the host.

Area of Science:

• Biochemistry
• Parasitology
• Drug Discovery

Background:

• Developing selective drugs against disease-causing cells (e.g., parasites) is challenging due to protein similarities between organisms.
• Subtle quantitative differences in biochemical reaction networks offer a basis for selective drug action.

Purpose of the Study:

• To identify precise criteria for network-based drug selectivity.
• To investigate energy metabolism in Trypanosoma brucei and human erythrocytes for selective antiparasitic targets.

Main Methods:

• Combined computational and experimental approaches.
• Comparative analysis of energy metabolism between Trypanosoma brucei and human erythrocytes.
• Validation in a novel parasite-erythrocyte co-culture system.

Main Results:

• Identified precise criteria for network-based drug selectivity.
• Glucose transport and glyceraldehyde-3-phosphate dehydrogenase in Trypanosoma brucei were identified as selective antiparasitic targets.
• Glucose-transport inhibitors demonstrated selective killing of trypanosomes without affecting erythrocytes, neurons, or liver cells.

Conclusions:

• Network-based selectivity provides an alternative or additive strategy to structural differences for drug development.
• Targeting specific metabolic pathways, like glucose transport, offers a promising approach for selective antiparasitic drug design.
• Validated glucose-transport inhibitors as effective and selective agents against Trypanosoma brucei.