부산대학교 도서관

Background: Previous studies have indicated that microchimerism is present in body tissues, peripheral blood, and plasma of recipients after organ transplantation. We hypothesize that donor-derived DNA may also be present in cell-free urine of renal transplant recipients and that the concentrations of urine DNA may be correlated with graft rejection. Methods: Thirty-one female patients who had renal transplantation were enrolled in the study. In women with male organ donors, the SRY gene on the Y chromosome was used as a marker for donor-derived DNA. Real-time quantitative PCR for the SRY and [Beta]-globin genes was carried out on cell-free urinary DNA from these patients. Serial urine samples from a female renal transplant recipient undergoing an acute rejection episode were also collected and analyzed with the [Beta]-globin quantitative PCR system. Results: SRY sequences were detected in the urine of 14 of 17 female patients with male organ donors. None of the 14 patients with female organ donors had detectable SRY sequences in urinary DNA. The median fractional concentration of donor-derived DNA was 8.7% (interquartile range, 1.9-26.4%). During the acute rejection episode, urinary concentrations of the [Beta]-globin gene were markedly increased, with the concentrations returning rapidly to normal following antirejection treatment. Conclusions: Our results demonstrate that urinary DNA chimerism is present following renal transplantation. The measurement of urinary DNA using quantitative PCR may be useful for the diagnosis and monitoring of graft rejection. [C] 1999 American Association for Clinical Chemistry
Multiple types of donor-derived cells are transferred to the recipient following transplantation of a solid-organ allograft and can exist in the recipient's tissues or peripheral blood for long periods after [...]