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The polycystins are modulated by cellular oxygen-sensing pathways and regulate mitochondrial function.

Valeria Padovano1, Ivana Y Kuo2, Lindsey K Stavola1

  • 1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06520.

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Polycystins, linked to Autosomal Dominant Polycystic Kidney Disease, interact with oxygen levels via PHD3. This interaction impacts cellular oxygen use and mitochondrial calcium uptake, revealing a new role in oxygen sensing.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Cellular Physiology

Background:

  • Autosomal dominant polycystic kidney disease (ADPKD) arises from mutations in polycystin-1 (PC1) and polycystin-2 (PC2).
  • The polycystin complex's roles in ciliary sensation, ER calcium release, and cellular metabolism are not fully understood.
  • Mechanisms governing PC1 and PC2 trafficking and function require further elucidation.

Purpose of the Study:

  • To investigate the regulation of the polycystin complex by cellular oxygen levels.
  • To explore the interaction between polycystins and oxygen-sensing proteins.
  • To determine the impact of PC1 on cellular energy metabolism and mitochondrial function.

Main Methods:

  • Investigated the interaction between PC1 and the oxygen-sensing enzyme EGLN3 (PHD3).
  • Assessed the effect of oxygen levels on polycystin complex localization and activity.
  • Analyzed cellular oxygen consumption and mitochondrial calcium uptake in PC1-deficient cells.

Main Results:

  • Oxygen levels regulate polycystin complex localization and channel activity via interaction with EGLN3 (PHD3), which hydroxylates PC1.
  • PC1 expression influences cellular oxygen consumption and mitochondrial calcium uptake.
  • Cells lacking PC1 exhibit reduced oxygen utilization and impaired mitochondrial calcium handling.

Conclusions:

  • The polycystin complex interacts with the oxygen-sensing machinery through EGLN3 (PHD3).
  • PC1 plays a significant role in modulating cellular mitochondrial function and calcium homeostasis.
  • Polycystins are implicated in a novel pathway for sensing and responding to cellular oxygen levels.