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Proteinuria after kidney transplantation

Claudio Ponticelli1, Giorgio Graziani

  • 1Division of Nephrology, Humanitas Scientific Institute, Rozzano, Milano, Italy. ponticelli.claudio@gmail.com

Transplant International : Official Journal of the European Society for Organ Transplantation
|May 24, 2012
PubMed

Insights

Proteinuria after kidney transplant, common in mTOR inhibitor users, predicts worse graft survival. Identifying the cause, whether tubular or glomerular, is key for managing transplant outcomes.

Area of Science:

  • Nephrology
  • Transplantation Immunology
  • Renal Medicine

Background:

  • Proteinuria is a significant complication following renal transplantation, affecting 11-45% of patients at one year.
  • Prevalence is higher in patients treated with mammalian target of rapamycin (mTOR) inhibitors.
  • Proteinuria is linked to poorer patient and graft survival rates post-transplant.

Purpose of the Study:

  • To elucidate the mechanisms and implications of proteinuria in renal transplant recipients.
  • To highlight the prognostic value of proteinuria for allograft outcomes.
  • To review current treatment strategies for proteinuria in this population.

Main Methods:

  • Review of existing literature on proteinuria post-renal transplantation.
  • Categorization of proteinuria into tubular and glomerular mechanisms.
  • Analysis of the relationship between proteinuria levels and patient/graft survival.

Main Results:

  • Proteinuria arises from either impaired proximal tubular reabsorption or glomerular barrier dysfunction.
  • Specific causes include ischemia-reperfusion, rejection, toxic agents, glomerulonephritis, and calcineurin inhibitor toxicity.
  • The degree of proteinuria reliably predicts allograft outcome, with even microalbuminuria indicating a poor prognosis.

Conclusions:

  • Management of proteinuria hinges on addressing the underlying etiology.
  • Renin-angiotensin system (RAS) inhibitors can mitigate microalbuminuria and reduce proteinuria.
  • The impact of RAS inhibitors on overall patient and graft survival remains unproven.

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