The polycystins are modulated by cellular oxygen-sensing pathways and regulate mitochondrial function.
Autosomal dominant polycystic kidney disease is caused by mutations in the genes encoding polycystin-1 (PC1) and polycystin-2 (PC2), which form an ion channel complex that may mediate ciliary sensory processes and regulate endoplasmic reticulum (ER) Ca release. Loss of PC1 expression profoundly alters cellular energy metabolism. The mechanisms that control the trafficking of PC1 and PC2, as well as their broader physiological roles, are poorly understood. We found that O levels regulate the subcellular localization and channel activity of the polycystin complex through its interaction with the O-sensing prolyl hydroxylase domain containing protein EGLN3 (or PHD3), which hydroxylates PC1. Moreover, cells lacking PC1 expression use less O and show less mitochondrial Ca uptake in response to bradykinin-induced ER Ca release, indicating that PC1 can modulate mitochondrial function. These data suggest a novel role for the polycystins in sensing and responding to cellular O levels.
|Year of Publication||
Mol Biol Cell
2017 01 15
|PubMed Central ID||
T32 GM007223 / GM / NIGMS NIH HHS / United States
UL1 TR001863 / TR / NCATS NIH HHS / United States
R00 DK101585 / DK / NIDDK NIH HHS / United States
P30 DK090744 / DK / NIDDK NIH HHS / United States
P01 DK017433 / DK / NIDDK NIH HHS / United States
R01 DK072614 / DK / NIDDK NIH HHS / United States