Galectin Hco-gal-m from Haemonchus contortus modulates goat monocytes and T cell function in different patterns

Area of Science:

• Parasitology
• Immunology
• Molecular Biology

Background:

• Monocytes and T cells are key immune cells in peripheral blood mononuclear cells (PBMC).
• Galectins have diverse regulatory roles in immune cells.
• The specific targets and mechanisms of Haemonchus contortus galectin (Hco-gal-m) on goat PBMC remain unclear.

Purpose of the Study:

• To investigate the expression and distribution of Hco-gal-m.
• To determine the binding activity of Hco-gal-m on goat monocytes and T cells.
• To elucidate the immunomodulatory effects of Hco-gal-m on these immune cells.

Main Methods:

• RT-PCR and Western blot for Hco-gal-m expression analysis.
• Immunohistochemistry to detect Hco-gal-m localization in adult worms.
• Flow cytometry to assess rHco-gal-m binding to monocytes and T cells.
• Co-incubation assays to analyze cytokine secretion, cell activation, and apoptosis.

Main Results:

• Hco-gal-m is expressed in L4 and adult worms, localized in the worm gut.
• Recombinant Hco-gal-m (rHco-gal-m) binds to both monocytes and T cells.
• rHco-gal-m differentially affects cytokine profiles: decreases IL-6, IL-10, TNF-α in T cells, increases IL-10 in monocytes.
• rHco-gal-m restricts MHC-II on monocytes and CD25 on T cells, inhibits T cell proliferation, and induces T cell apoptosis.

Conclusions:

• Hco-gal-m exhibits distinct immunomodulatory patterns on goat monocytes and T cells.
• The study clarifies Hco-gal-m's interaction with specific PBMC subpopulations.
• Findings provide insights into host-parasite immune interactions.