Inability of thoracic duct drainage to prevent hyperacute rejection.

Area of Science:

• Nephrology
• Immunology
• Transplantation

Background:

• Renal allotransplantation outcomes are influenced by humoral immune responses.
• Lymphocyte depletion is a strategy explored to mitigate rejection.
• Understanding protein and immunoglobulin dynamics during lymphocyte depletion is crucial.

Purpose of the Study:

• To investigate the effects of lymphocyte depletion via thoracic duct drainage (TDD) on serum albumin and immunoglobulin (Ig) levels.
• To quantify protein loss during TDD and assess its impact on immune markers.
• To evaluate the efficacy of TDD in preventing humoral rejection in renal transplant recipients.

Main Methods:

• Lymphocyte depletion using thoracic duct drainage (TDD) for 6 weeks in 21 patients awaiting renal allotransplantation.
• Measurement of serum and lymph albumin and Ig levels.
• Quantification of protein loss from blood sampling, dialysis, and lymph centrifugation in a subset of patients.

Main Results:

• Serum IgG declined faster and to a greater extent than albumin during TDD.
• Total albumin loss was significantly greater than IgG loss.
• Hyperacute or acute humoral rejection occurred in 14 grafts in 10 TDD-prepared patients despite negative crossmatch tests.

Conclusions:

• Lymphocyte removal by TDD, rather than protein loss, significantly affects IgG levels.
• TDD and IgG depletion do not prevent hyperacute or acute humoral rejection.
• Current crossmatch tests may be insufficient to predict antibody-mediated graft rejection accurately.