CD83 regulates splenic B cell maturation and peripheral B cell homeostasis

Area of Science:

• Immunology
• Cell Biology

Background:

• Murine CD83 expressed on thymic epithelial cells is crucial for T cell development.
• Emerging evidence suggests CD83 also plays a role in peripheral T and B cell responses.

Purpose of the Study:

• To investigate the role of CD83 in the maturation and survival of peripheral B cells.
• To elucidate the regulatory function of CD83 in B cell homeostasis.

Main Methods:

• Utilized mixed bone marrow chimeras to compare wild-type, CD83-overexpressing, and CD83-deficient B cells in vivo.
• Analyzed B cell populations, including transitional, follicular, and marginal zone B cells, and assessed T cell survival.

Main Results:

• CD83 overexpression in immature B cells led to transitional B cell accumulation and reduced follicular B cell maturation, dose-dependently.
• Absence of CD83 resulted in decreased marginal zone B cell maturation and a mild survival advantage for B cells.
• CD83 overexpression specifically and dose-dependently disrupted B cell homeostasis without affecting T cell survival over 30 weeks.

Conclusions:

• CD83 acts as a negative regulator of B cell maturation and survival in the periphery.
• CD83 plays a critical role in maintaining B cell homeostasis, impacting different B cell subsets distinctly.