Investigating dysregulated pathways in Staphylococcus aureus (SA) exposed macrophages based on pathway interaction...

Area of Science:

• Immunology
• Computational Biology
• Systems Biology

Background:

• Staphylococcus aureus (SA) infections pose significant health challenges.
• Understanding host-pathogen interactions at the molecular level is crucial for effective treatment.
• Macrophage responses are central to the innate immune defense against bacterial infections.

Purpose of the Study:

• To identify dysregulated biological pathways in macrophages upon exposure to Staphylococcus aureus (SA).
• To leverage pathway interaction networks (PIN) for a systems biology approach to uncover infection-related molecular changes.
• To discover potential molecular targets and biomarkers for SA infection.

Main Methods:

• Construction of a pathway interaction network (PIN) using gene expression, protein-protein interaction (PPI), and pathway data.
• Identification of a 'seed pathway' through principal component analysis (PCA) of pathway activity scores.
• Utilizing a minimum set of pathways (MSP) approach with support vector machines (SVM) and area under the receiver operating characteristics curve (AUC) to pinpoint dysregulated pathways.

Main Results:

• The pathway interaction network (PIN) integrated extensive biological data, including 20,545 genes and 449,833 interactions.
• The 'seed pathway' was identified as Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.
• A set of 15 dysregulated pathways, including Respiratory electron transport and DNA Replication, were identified in SA-infected macrophages with high accuracy (AUC=0.999).

Conclusions:

• 15 dysregulated pathways in SA-infected macrophages were successfully identified using the PIN approach.
• These pathways represent potential biomarkers for early detection and therapeutic strategies against SA infections.
• Further research is needed to elucidate the coordinated function of these identified dysregulated pathways in the context of SA infection.