Comparative Proteomics Analysis for Elucidating the Interaction Between Host Cells and Toxoplasma gondii

Area of Science:

• Parasitology
• Proteomics
• Cell Biology

Background:

• Toxoplasma gondii infects warm-blooded organisms, with host cell invasion being crucial for its lifecycle.
• Understanding host-parasite interactions at a molecular level is essential for controlling infections.

Purpose of the Study:

• To investigate global proteomic changes in human foreskin fibroblasts (HFFs) and T. gondii during intracellular infection.
• To identify differentially expressed proteins and altered pathways in both host and parasite.

Main Methods:

• Tandem mass tag (TMT) analysis was employed to quantify proteins in infected HFFs (HT) versus HFFs (H) and in T. gondii within infected cells (HT) versus isolated T. gondii (T).
• Gene ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed on differentially expressed proteins.

Main Results:

• 375 host cell proteins and 1099 T. gondii proteins were differentially expressed.
• Host cells showed enrichment in metabolic and immune signaling pathways (NF-κB, cAMP, Rap1).
• T. gondii exhibited alterations in ribosome biogenesis, citrate cycle, and galactose metabolism.

Conclusions:

• T. gondii infection induces significant proteomic modifications in both host cells and the parasite.
• These changes impact host cell metabolism and immune responses, while altering parasite biosynthesis and metabolism.
• The findings provide insights into the molecular mechanisms of host-parasite interaction during T. gondii infection.