Related Experiment Video

Updated: Mar 24, 2026

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
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mTORC1-mediated inhibition of polycystin-1 expression drives renal cyst formation in tuberous sclerosis complex

Monika Pema1,2, Luca Drusian1,2, Marco Chiaravalli1

  • 1Division of Genetics and Cell Biology, Dibit San Raffaele Scientific Institute, Via Olgettina, 58, Milano 20132, Italy.

Nature Communications
|March 3, 2016
PubMed

Insights

This study reveals mTORC1 negatively regulates polycystin-1, impacting polycystic kidney disease (PKD) and tuberous sclerosis complex (TSC). This finding explains severe kidney issues in TSC/PKD syndromes and suggests mTOR inhibitors for certain PKD types.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Genetics

Background:

  • Cross-talk between polycystic kidney disease (PKD) and tuberous sclerosis complex (TSC) genes is documented.
  • mTOR signaling is elevated in PKD, and rapamycin can slow cyst growth.
  • Renal TSC gene inactivation leads to cyst formation.

Purpose of the Study:

  • To investigate the interplay between PKD and TSC genes.
  • To elucidate the role of mTORC1 in polycystin-1 biogenesis and trafficking.
  • To understand the mechanisms underlying renal manifestations in TSC/PKD contiguous gene syndrome.

Main Methods:

  • Kidney-specific gene inactivation of Pkd1 or Tsc1 using KspCre.
  • Genetic interaction studies.
  • Analysis of polycystin-1 (PC-1) biogenesis and PC-1/2 complex trafficking to cilia.

Main Results:

  • Kidney-specific Pkd1 inactivation caused aggressive PKD, while Tsc1 inactivation resulted in mild PKD.
  • mTORC1 was found to negatively regulate PC-1 biogenesis and PC-1/2 complex trafficking to cilia.
  • PC-1 downregulation by mTORC1 plays a crucial role in the cystogenesis of Tsc1 mutants.

Conclusions:

  • A novel interplay between PKD and TSC genes was identified, impacting disease pathophysiology.
  • mTORC1's negative regulation of PC-1 explains cystogenesis in Tsc1 mutants.
  • mTOR inhibitors may offer therapeutic potential for specific forms of autosomal dominant PKD.

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