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Down-regulation of PKHD1 induces cell apoptosis through PI3K and NF-κB pathways

Liping Sun1, Shixuan Wang, Chaofeng Hu

  • 1Division of Nephrology, Shenzhen People's Hospital, Second Clinical Medical College, Jinan University, Shenzhen 518020, China.

Experimental Cell Research
|February 9, 2011
PubMed

Insights

PKHD1 gene mutations cause ARPKD. Silencing PKHD1 in kidney cells increased PI3K/Akt activity, which, when inhibited, promoted apoptosis and increased NF-κB activity, suggesting a role in ARPKD pathogenesis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Autosomal recessive polycystic kidney disease (ARPKD) is caused by mutations in the PKHD1 gene.
  • Fibrocystin/polyductin (FPC), encoded by PKHD1, is a protein implicated in ARPKD pathogenesis.
  • The precise mechanisms regulating apoptosis in ARPKD cystogenesis remain unclear.

Purpose of the Study:

  • To investigate the interplay between apoptosis, phosphatidylinositol 3-kinase (PI3K)/Akt signaling, and nuclear factor κB (NF-κB) in kidney cells with reduced FPC expression.
  • To elucidate the role of FPC in regulating cell survival and death pathways relevant to ARPKD.

Main Methods:

  • Utilized PKHD1-silenced HEK293 cells to model FPC deficiency.
  • Administered PI3K/Akt inhibitors (LY294002, wortmannin) to assess their impact on apoptosis and proliferation.
  • Measured caspase-3 activity and NF-κB activation levels.

Main Results:

  • PKHD1 silencing led to elevated PI3K/Akt pathway activity in HEK293 cells.
  • Inhibition of PI3K/Akt significantly increased serum starvation-induced apoptosis.
  • PI3K/Akt inhibition resulted in decreased cell proliferation and enhanced NF-κB activity.

Conclusions:

  • The PI3K/Akt pathway plays a crucial role in regulating apoptosis in PKHD1-silenced kidney cells.
  • Inhibition of PI3K/Akt signaling correlates with increased NF-κB activity.
  • These findings offer insights into FPC function and potential therapeutic strategies for ARPKD.

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