Development and Detection of Kidd Antibodies

Area of Science:

• Immunology
• Nephrology
• Transplantation

Background:

• Kidd antibodies are known to cause hemolytic transfusion reactions and hemolytic disease of the fetus and newborn.
• The Kidd blood group system antigens (Jka and Jkb) are expressed on erythrocytes and other tissues, including the kidney.

Observation:

• A 59-year-old male patient, post-allogeneic renal transplant, developed anti-Kidd(a) antibodies.
• Antibody formation was linked to exposure to Kidd antigen on the transplanted kidney's tubular epithelium.
• The patient presented with nephrotic syndrome 5 years after transplantation.

Findings:

• This case demonstrates de novo anti-Kidd(a) antibody development in an untransfused recipient following renal transplantation.
• The findings suggest that Kidd antigens expressed on the graft can elicit an immune response.
• Review of literature indicates Kidd antibodies are associated with kidney graft rejection.

Implications:

• Kidd antigens may function as minor histocompatibility antigens in renal transplantation.
• This highlights the importance of considering blood group antigen compatibility beyond ABO and RhD in transplantation.
• Further research is warranted to elucidate the role of Kidd antigens in graft rejection and patient outcomes.