Schistosome immunomodulators.

Area of Science:

• Parasitology
• Immunology
• Molecular Biology

Background:

• Schistosomes are intravascular parasitic platyhelminths infecting over 200 million people globally.
• Understanding how these parasites manipulate host immune responses is crucial for disease control and therapeutic development.

Purpose of the Study:

• To review the molecular mechanisms employed by schistosomes to dampen host immune responses.
• To highlight the diverse biomolecules produced by schistosomes across different life stages that modulate host immunity.
• To explore the therapeutic potential of schistosome-derived immunomodulators.

Main Methods:

• Literature review of studies on schistosome-host immune interactions.
• Analysis of molecular mechanisms involving parasite-secreted proteins, lipids, glycans, and extracellular vesicles.
• Examination of the immunomodulatory effects of specific schistosome molecules on host immune cells.

Main Results:

• Schistosomes utilize tegumental ectoenzymes to cleave host signaling molecules (ATP, ADP, AMP).
• Parasites release various proteins (e.g., SmCB1, SjHSP70), glycans, and lipids that modulate immune cell function.
• Extracellular vesicles containing microRNAs and parasite-produced eicosanoids further influence host cell metabolism and immune responses.
• Many schistosome molecules induce aspects of the Th2 immune response, including regulatory T cells, B cells, and M2 macrophages.

Conclusions:

• Schistosomes employ a sophisticated arsenal of biomolecules to evade and manipulate host immunity.
• These molecules collectively induce a polarized Th2 immune response, facilitating parasite survival.
• Schistosome immunomodulators represent promising candidates for novel therapeutics against non-parasitic inflammatory and autoimmune diseases.