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Development and Application of Rapamycin-regulated Tyrosine Phosphatases

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Published on: September 6, 2024

Rapamycin-induced phosphaturia.

Daniela S Kempe¹, Miribane Dërmaku-Sopjani, Henning Fröhlich

¹Department of Physiology, University of Tübingen, Gmelinstr. 5, D-72076, Tübingen, Germany.

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association

|April 7, 2010

Summary

This summary is machine-generated.

The mammalian target of rapamycin (mTOR) regulates renal phosphate transport. Inhibition of mTOR with rapamycin influences phosphate balance by increasing phosphate excretion in mice.

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Area of Science:

Molecular Biology
Renal Physiology
Biochemistry

Background:

Mammalian target of rapamycin (mTOR) is known to regulate intestinal phosphate transporter NaPi-IIb.
The role of mTOR in regulating the primary renal phosphate transporter, NaPi-IIa, remains largely unelucidated.

Purpose of the Study:

To investigate the regulatory role of mTOR in the function of the renal phosphate transporter NaPi-IIa.
To determine the effect of mTOR inhibition on renal phosphate handling and overall phosphate balance.

Main Methods:

NaPi-IIa was expressed in Xenopus oocytes, with or without mTOR co-expression.
Phosphate transport was quantified by measuring phosphate-induced currents (I(pi)).
The effect of rapamycin on NaPi-IIa function was assessed in vitro (oocytes) and in vivo (mice).

Main Results:

Co-expression of mTOR significantly enhanced phosphate transport mediated by NaPi-IIa in Xenopus oocytes.
This enhancement was abolished by rapamycin treatment, indicating mTOR-dependent regulation.
In vivo, rapamycin administration induced phosphaturia in mice, suggesting impaired renal phosphate reabsorption.

Conclusions:

mTOR plays a significant role in regulating renal tubular phosphate transport via NaPi-IIa.
Pharmacological inhibition of mTOR with rapamycin impacts systemic phosphate balance, leading to increased phosphate excretion.