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Related Experiment Videos

mTOR inhibitors: do they help preserve renal function?

J Moro1, L Almenar, L Martínez-Dolz

  • 1Cardiac Failure and Transplant Unit, Cardiology Service, Valencia, Spain. moro@uv.es

Transplantation Proceedings
|September 25, 2007
PubMed
Summary
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Switching to mammalian target of rapamycin (mTOR) inhibitors in heart transplant recipients did not significantly alter renal function. This immunosuppressive regimen change may help delay calcineurin inhibitor-induced kidney damage.

Area of Science:

  • Nephrology
  • Cardiology
  • Immunology

Background:

  • Renal function decline is a major complication in heart transplant recipients.
  • Mammalian target of rapamycin (mTOR) inhibitors are explored as alternatives to calcineurin inhibitors to preserve kidney function.
  • This study evaluates renal function changes after switching immunosuppressive strategies.

Purpose of the Study:

  • To assess the impact of switching from calcineurin inhibitors to mTOR inhibitors on renal function in heart transplant patients.
  • To determine if mTOR inhibitors can mitigate or reverse renal function deterioration post-transplant.

Main Methods:

  • A cohort of 23 heart transplant recipients with a mean follow-up of 11 months was studied.
  • Cyclosporine was replaced with an mTOR inhibitor (everolimus or sirolimus).

Related Experiment Videos

  • Renal function (creatinine levels and creatinine clearance) was monitored before and after the switch, with statistical analysis using the Student t test.

    • Main Results:

    • No significant difference was observed in mean creatinine levels (1.89 vs. 2.0 mg/dL) or creatinine clearance (61.7 vs. 68.3 mL/min) post-switch.
    • In patients switched due to renal dysfunction, renal function parameters also showed no significant change (creatinine 2.38 vs. 2.28 mg/dL, clearance 42.3 vs. 43.6 mL/min).
    • The primary reasons for switching were increased creatinine (65%) and tumor development (26%).

    Conclusions:

    • Introducing mTOR inhibitors into the immunosuppressive regimen did not lead to significant changes in renal function in this cohort.
    • The findings suggest that mTOR inhibitors may not improve, but do not worsen, renal function compared to calcineurin inhibitors in the short term.
    • Further research is needed to confirm the long-term effects and potential benefits of mTOR inhibitors in delaying renal functional deterioration in heart transplant recipients.