The arginine-creatine pathway is disturbed in children and adolescents with renal transplants

Area of Science:

• Nephrology
• Biochemistry
• Transplantation

Background:

• Cardiovascular disease is a significant complication in renal transplant recipients.
• The arginine-creatine pathway is linked to renal function and the methionine-homocysteine cycle.
• Understanding metabolic alterations in transplant patients is crucial for managing long-term health.

Purpose of the Study:

• To investigate the arginine-creatine pathway status in pediatric and adolescent renal transplant recipients.
• To explore the relationship between this pathway, renal function, and homocysteine levels.

Main Methods:

• Study included 29 children and adolescents post-renal transplant on immunosuppressive therapy.
• Measured plasma homocysteine and glycine concentrations.
• Assessed urinary guanidinoacetate and creatine excretion.
• Correlated metabolic markers with creatinine clearance and homocysteine levels.

Main Results:

• Patients exhibited significantly higher plasma homocysteine and glycine levels compared to controls.
• Urinary excretion of guanidinoacetate and creatine was significantly lower in transplant recipients.
• Lower creatine excretion correlated negatively with plasma homocysteine levels.
• Urinary guanidinoacetate and creatine excretion positively correlated with creatinine clearance.

Conclusions:

• Disturbances in the arginine-creatine pathway are present in renal transplant patients even with adequate renal function.
• Low urinary guanidinoacetate and creatine may be linked to immunosuppressive therapy's nephrotoxic effects.
• Hyperhomocysteinemia and defective methylation might contribute to these observed metabolic changes.