Nematode Galectin Inhibits Basophilic Leukaemia RBL-2H3 Cells Apoptosis in IgE-Mediated Activation

Area of Science:

• Immunology
• Parasitology
• Molecular Biology

Background:

• Mast cells are crucial for host defense against parasitic nematodes.
• Parasitic nematodes secrete molecules, such as galectin 1 (Tci-gal-1), to evade host immune responses.
• Tci-gal-1 from Teladorsagia circumcincta modulates mast cell degranulation and mediator release in an IgE-dependent manner.

Purpose of the Study:

• To investigate the effects of Tci-gal-1 on gene expression, protein production, and apoptosis in activated mast cells.
• To understand how Tci-gal-1 influences the immune response during parasitic nematode infections.

Main Methods:

• Activated rat basophilic leukemia RBL-2H3 cells were treated with Tci-gal-1.
• Gene expression was analyzed using microarray analysis.
• Protein levels of cytokines and apoptosis-related molecules were measured by antibody arrays and ELISA.
• Apoptosis and degranulation were assessed via cytometry and a β-hexosaminidase release assay.

Main Results:

• Tci-gal-1 treatment inhibited apoptosis and reduced degranulation in activated RBL-2H3 cells.
• Significant changes in gene expression were not detected.
• Production of pro-apoptotic molecules (RAGE, FasL) and cytokines (IL-9, IL-10, IL-13, TNF-α, IL-2) was significantly inhibited.
• Tci-gal-1 modulated protein production and apoptosis without affecting gene transcription.

Conclusions:

• Tci-gal-1 plays a critical role in modulating the host immune response to parasitic nematodes.
• This parasite protein inhibits mast cell degranulation and apoptosis, contributing to immune evasion.
• Tci-gal-1 is crucial for suppressing chronic inflammation driven by mast cell activity.