B cell activation in chickens induced by Staphylococcus aureus.

Area of Science:

• Immunology
• Avian immunology
• B cell activation

Background:

• Conventional mammalian polyclonal B cell activators are widely used in immunology research.
• Understanding avian immune responses is crucial for poultry health and disease management.

Purpose of the Study:

• To investigate the efficacy of mammalian polyclonal B cell activators in chicken immune cells.
• To characterize B cell activation and immunoglobulin synthesis in chickens using S. aureus.

Main Methods:

• Culturing chicken spleen and peripheral blood lymphocytes (PBLs).
• Stimulating cultures with lipopolysaccharide and Staphylococcus aureus (S. aureus) strains.
• Assessing cell proliferation and identifying responding cell populations.
• Evaluating immunoglobulin synthesis in vitro and in vivo.

Main Results:

• S. aureus (Cowan I and Wood 46 strains) induced moderate B cell proliferation in chicken spleen and PBL cultures.
• Proliferation was dependent on the presence of adherent cells.
• Lipopolysaccharide showed only marginal influence on proliferation.
• In vitro polyclonal immunoglobulin synthesis was not detected, but intravenous S. aureus administration induced it.

Conclusions:

• S. aureus acts as a potent polyclonal B cell activator in chickens, distinct from its effects in mammals.
• Adherent cells are essential for S. aureus-induced B cell activation in avian systems.
• Avian polyclonal B cell activation and immunoglobulin production can be induced in vivo, highlighting potential therapeutic or research applications.