CD83 modulates B cell function in vitro: increased IL-10 and reduced Ig secretion by CD83Tg B cells

Area of Science:

• Immunology
• Cell Biology

Background:

• The transmembrane glycoprotein CD83 is a key regulator of T cell maturation and responses.
• Previous studies indicated CD83 influences immunoglobulin (Ig) responses in B cells.
• This study investigates the specific role of CD83 expression levels in B cell function.

Purpose of the Study:

• To compare the function of B cells with overexpressed CD83 (CD83Tg) versus reduced CD83 expression (CD83mu).
• To elucidate the impact of CD83 on B cell activation markers, signaling, and cytokine production.

Main Methods:

• Comparison of CD83Tg and CD83mu B cells with wild-type B cells.
• Analysis of B cell activation markers (CD86, MHC-II) post-stimulation.
• Assessment of calcium signaling, Ig secretion, and IL-10 production in vitro.

Main Results:

• CD83Tg B cells showed increased CD86 and MHC-II, while CD83mu B cells showed decreased levels.
• Overexpressed CD83 led to reduced calcium signaling and Ig secretion but increased IL-10 production.
• Reduced CD83 expression in CD83mu B cells resulted in decreased IL-10 and slightly increased Ig secretion.

Conclusions:

• CD83 is expressed by B cells upon activation.
• CD83 expression levels significantly modulate B cell activation, Ig secretion, and IL-10 production.
• CD83 plays a regulatory role in B cell function, impacting immune responses.