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mTOR inhibitors and renal allograft: Yin and Yang

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Abstract

Mammalian target of rapamycin inhibitors (mTOR-I), everolimus and sirolimus, are immunosuppressive drugs extensively used in renal transplantation. Their main mechanism of action is the inhibition of cell signaling through the PI3 K/Akt/mTOR pathway. This interesting mechanism of action confers to these medications both great immunosuppressive potential and important anti-neoplastic properties. Although the clinical utility of this drug category, as with other antineoplastic/immunosuppressants, is clear, the use of mTOR-I commonly results in the development of several complications. In particular, these agents may determine severe renal toxicity that, as recent studies report, seems clearly correlated to dose and duration of drug use. The mTOR-I-induced renal allograft spectrum of toxicity includes the enhanced incidence of delayed graft function, nephrotoxicity in particular when co-administered with calcineurin inhibitors (CNI) and onset of proteinuria. The latter effect appears highly frequent in patients undergoing mTOR-I treatment and significantly associated with a rapid graft lost. The damage leading to this complication interests both the glomerular and tubular area. mTOR-I cause an inhibition of proliferation in podocytes and the epithelial-to-mesenchymal transition in tubular cells. Interestingly, all these side effects are mostly reversible and dose related. Therefore, it is unquestionable that these particular drugs should be administered at the lowest dose able to maintain relatively low trough levels, in order to maximize their important and specific therapeutic effects while minimizing or avoiding drug toxicities. Utilization of low dosages of mTOR-I should be encouraged not only in CNI-combined schemas, but also when administered alone in a CNI-free immunosuppressive protocol.

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Authors and Affiliations

  1. Renal Unit, Department of Medicine, University-Hospital of Verona, Piazzale A. Stefani 1, 37126, Verona, VR, Italy

    Gianluigi Zaza, Simona Granata, Paola Tomei, Valentina Masola & Antonio Lupo

  2. Division of Nephrology and Dialysis, Columbus-Gemelli Hospital Catholic University, School of Medicine Rome, Via G. Moscati, 31, 00168, Roma, Italy

    Giovanni Gambaro

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  1. Gianluigi Zaza
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Zaza, G., Granata, S., Tomei, P. et al. mTOR inhibitors and renal allograft: Yin and Yang. J Nephrol 27, 495–506 (2014). https://doi.org/10.1007/s40620-014-0103-y

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