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P-glycoprotein expression is not a useful predictor of acute or chronic kidney graft rejection
1Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Germany.
Abstract:
Because of the role of P-glycoprotein (P-gp) in multidrug resistance (MDR), it has been suggested that P-gp might play a role in acute and chronic rejection after organ transplantation. The purpose of the present work was to investigate a possible relationship between graft outcome and P-gp expression on peripheral mononuclear cells of renal transplant recipients. We determined P-gp expression in 27 patients with long-term, stable graft function (ST) and in 15 patients with chronic deterioration of graft function (CR). In addition, 40 patients were studied prior to, and at intervals after, transplantation with 21 healthy individuals serving as controls. P-gp values were highest in healthy controls and in ST patients. We found no correlation between P-gp values and acute rejection. CR patients tended to have lower levels of P-gp expression. Our results contradict the opinion that an overexpression of P-gp induces acute or chronic rejection by inhibiting the efficacy of immunosuppressive treatment.
Insights
P-glycoprotein (P-gp) expression in renal transplant recipients did not correlate with acute rejection. Lower P-gp levels were observed in patients with chronic graft dysfunction, contradicting theories of P-gp involvement in transplant rejection.
Area of Science:
- Immunology
- Pharmacology
- Transplantation Science
Background:
- P-glycoprotein (P-gp) is implicated in multidrug resistance (MDR).
- P-gp's role in organ transplant rejection, particularly acute and chronic rejection, has been hypothesized.
- Understanding P-gp expression may offer insights into graft outcomes.
Purpose of the Study:
- To investigate the relationship between graft outcome and P-glycoprotein expression on peripheral mononuclear cells in renal transplant recipients.
- To determine if P-gp levels correlate with acute or chronic rejection after kidney transplantation.
Main Methods:
- P-gp expression was measured in peripheral mononuclear cells.
- Study included renal transplant recipients with stable graft function (ST) and chronic rejection (CR).
- Controls included healthy individuals and patients pre- and post-transplantation.
Main Results:
- P-gp levels were highest in healthy controls and ST patients.
- No correlation was found between P-gp values and acute rejection.
- Patients with chronic rejection (CR) exhibited lower P-gp expression levels.
Conclusions:
- The findings contradict the hypothesis that P-gp overexpression contributes to acute or chronic transplant rejection by affecting immunosuppressive drug efficacy.
- P-gp expression levels in peripheral mononuclear cells do not appear to be a predictive marker for acute rejection in renal transplant recipients.
- Lower P-gp expression in chronic rejection suggests a complex, rather than direct, role in the rejection process.