Microchimerism as Post-Transplant Marker of a Chronic Rejection Process

Area of Science:

• Nephrology
• Immunology
• Transplantation Science

Background:

• Kidney transplant recipients face a high risk of organ loss.
• Non-invasive markers for early detection of transplant dysfunction are needed.

Purpose of the Study:

• To investigate the impact of post-transplant microchimerism on transplanted kidney function.
• To assess microchimerism as a potential non-invasive marker for chronic kidney rejection.

Main Methods:

• Study included 100 kidney transplant recipients (opposite-sex donors).
• Microchimerism assessed via multiplex PCR in urine and blood samples.
• Correlations analyzed between microchimerism and kidney function markers (blood urea, K+, cystatin C, HLA alleles).

Main Results:

• Donor DNA detected in urine of all female recipients and some blood samples.
• Female DNA found in urine of male recipients, but not blood.
• Urinary microchimerism in females correlated with blood urea and K+.
• Blood microchimerism in females correlated with blood urea, cystatin C, and HLA incompatibility.
• Delayed graft function (DGF) history linked to higher urinary donor DNA in females.

Conclusions:

• Post-transplant microchimerism, particularly donor DNA in urine, shows potential as a non-invasive marker for chronic kidney transplant rejection.
• Further research is warranted to validate microchimerism as a reliable indicator of transplant health and guide clinical management.