Prospective Analyses of Circulating B Cell Subsets in ABO-Compatible and ABO-Incompatible Kidney Transplant...

Area of Science:

• Immunology
• Transplantation Science
• Clinical Nephrology

Background:

• Traditional immunosuppression in renal transplantation targets T cells.
• B cells were primarily studied for antibody-mediated rejection, with antibody-independent functions gaining recent attention.
• Distinct B cell subsets can modulate immune responses, impacting transplant outcomes.

Purpose of the Study:

• To prospectively analyze the dynamic changes in peripheral blood B cell subsets in renal transplant recipients.
• To compare B cell subset evolution in AB0-compatible and AB0-incompatible transplant patients.
• To investigate the correlation between B cell subset alterations and renal allograft rejection.

Main Methods:

• Prospective analysis of peripheral blood B cell subsets in AB0-compatible and AB0-incompatible renal transplant recipients.
• Flow cytometry to characterize B cell subsets.
• Monitoring of patients for signs of rejection and treatment effects (e.g., Rituximab).

Main Results:

• Activated B cells and plasmablasts decreased in non-rejecting patients but increased significantly in those with rejection.
• Rituximab treatment led to sustained B cell depletion and a naive phenotype in repopulating cells.
• Acute rejection correlated with increased activated B cells/plasmablasts and decreased regulatory B cells.

Conclusions:

• Standard immunosuppression significantly impacts circulating B cell subsets.
• Altered B cell compartment dynamics are associated with renal allograft rejection.
• Targeting specific detrimental B cell subsets may offer a novel therapeutic strategy in renal transplantation.