Mannose binding lectin level and polymorphism in patients on long-term peritoneal dialysis

Area of Science:

• Nephrology
• Immunology
• Infectious Disease

Background:

• Infection is a major cause of mortality in end-stage renal disease patients.
• Peritoneal dialysis (PD) patients are susceptible to infections like peritonitis.
• Mannose Binding Lectin (MBL) is crucial for innate immunity against infections.

Purpose of the Study:

• To investigate if serum MBL levels and MBL gene mutations are risk factors for PD-related peritonitis.
• To compare MBL levels and mutation rates across different dialysis patient groups.

Main Methods:

• Studied four groups: PD patients with peritonitis, peritonitis-free PD patients, hemodialysis (HD) patients, and HD patients converted from PD.
• Measured serum MBL concentrations and analyzed MBL codon 54 point mutations.

Main Results:

• Dialysis patients exhibited significantly lower serum MBL levels than healthy controls, irrespective of MBL gene mutation or dialysis modality.
• No significant difference in MBL levels or codon 54 mutation frequency was found among the four dialysis patient groups.
• PD patients with codon 54 mutation had lower serum MBL than HD patients with similar mutations.

Conclusions:

• Lower MBL levels in dialysis patients may contribute to increased infection susceptibility.
• Peritonitis risk in PD patients is multifactorial, with other factors like hygiene and technique being significant.
• MBL level is not the sole primary determinant of peritonitis in maintenance PD patients.