Serum IgG and renal transplantation

Area of Science:

• Nephrology
• Immunology
• Pharmacology

Background:

• Renal allograft recipients often receive long-term immunosuppression.
• Understanding the impact of immunosuppressive drugs on immunoglobulin levels is critical for patient management.

Purpose of the Study:

• To investigate the effect of prednisolone and azathioprine on serum immunoglobulin G (IgG) levels in renal allograft recipients.
• To determine the relationship between immunosuppressive drug dosage, renal function, and IgG levels.
• To evaluate IgG levels as a potential marker for immunosuppression efficacy and toxicity.

Main Methods:

• Prospective study of 57 renal allograft patients.
• Monitoring serum IgG levels in relation to prednisolone and azathioprine dosage.
• Assessing creatinine clearance and its correlation with IgG levels.
• Observing the impact of hemodialysis and graft function on IgG levels.

Main Results:

• Prolonged administration of prednisolone and azathioprine led to a significant and persistent fall in serum IgG across all creatinine clearance levels.
• The reduction in IgG was more pronounced in patients with creatinine clearance below 25 ml/min.
• Lower drug doses caused IgG decline when creatinine clearance was <35 ml/min, with recovery dependent on renal function and dosage.
• Post-transplant hemodialysis mitigated IgG depression, and immediately functioning grafts showed minimal IgG reduction.
• Severe infections and toxicity were linked to the greatest IgG reduction, while leucopenia and thrombocytopenia were unreliable toxicity indicators.
• Falls in IgG were not associated with graft rejection.

Conclusions:

• Serum IgG levels significantly decrease with standard immunosuppressive therapy in renal allograft recipients.
• IgG levels are influenced by drug dosage and renal function, suggesting their utility as a monitoring tool.
• Monitoring serum IgG is recommended to guide immunosuppression and identify potential toxicity in renal allograft patients.