Transitional B Cells Predominantly Reconstituted After a Desensitization Therapy Using Rituximab Before Kidney...

Area of Science:

• Immunology
• Transplantation immunology
• Cellular immunology

Background:

• B cells play a critical role in graft rejection and tolerance after kidney transplantation (KTx).
• Previous research indicated that rituximab (RIT) induction before KTx can decrease chronic rejection rates.
• Understanding B cell dynamics post-RIT is crucial for optimizing KTx outcomes.

Purpose of the Study:

• To investigate the characteristics of B cell populations following rituximab induction in kidney transplant recipients.
• To identify the predominant B cell subsets and their associated molecular markers after RIT treatment.

Main Methods:

• A cross-sectional study involving 29 kidney transplant patients.
• Blood samples collected 3 to 18 months post-KTx.
• Comparison of B cell populations between patients with and without RIT induction.

Main Results:

• In patients receiving RIT induction, repopulating B cells were predominantly of the transitional type, with a scarcity of memory B cells.
• Transcriptional levels of IL-10 were similar between RIT-induced and non-induced groups.
• Increased transcription levels of BAFF-receptor were observed in patients who received RIT induction.

Conclusions:

• Following rituximab induction for kidney transplantation, the major B cell subset consists of highly proliferating transitional B cells expressing BAFF-receptor.
• These findings highlight the altered B cell landscape post-RIT and suggest BAFF-receptor as a key marker in this context.