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Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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PIKfyve upregulates CFTR activity.

Eva-Maria Gehring1, Rebecca S Lam, Gulab Siraskar

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

Biochemical and Biophysical Research Communications
|October 27, 2009
PubMed
Summary
This summary is machine-generated.

The study reveals that PKB/Akt and PIKfyve regulate the cystic fibrosis transmembrane conductance regulator (CFTR) channel. These proteins enhance CFTR function and abundance, but not the defective (DeltaF508)CFTR variant, highlighting a novel therapeutic target.

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Area of Science:

  • Molecular biology
  • Cell physiology
  • Ion channel function

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) is a cAMP-activated chloride channel crucial for epithelial function.
  • Mutations, like (DeltaF508)CFTR, cause cystic fibrosis, characterized by impaired chloride secretion.
  • CFTR activity is modulated by kinases, including SGK1, which interacts with PIKfyve and PKB/Akt.

Purpose of the Study:

  • To investigate whether PKB/Akt and PIKfyve act as regulators of CFTR function.
  • To determine if these regulators affect both wild-type CFTR and the common disease-causing mutant (DeltaF508)CFTR.

Main Methods:

  • Expression of CFTR or (DeltaF508)CFTR in Xenopus oocytes.
  • Co-expression with PKB/Akt, PIKfyve, or a kinase-resistant PIKfyve mutant ((S318A)PIKfyve).
  • Measurement of cAMP-induced chloride current (I(cAMP)) using dual electrode voltage clamp and assessment of protein abundance via immunohistochemistry.

Main Results:

  • Forskolin/IBMX stimulation activated I(cAMP) in CFTR-expressing oocytes, but not in those with (DeltaF508)CFTR.
  • Co-expression of PKB/Akt and PIKfyve significantly increased I(cAMP) in CFTR-expressing oocytes (2-3 fold), but not in (DeltaF508)CFTR oocytes.
  • PIKfyve, but not (S318A)PIKfyve, enhanced CFTR protein levels, indicating a role in protein stability or trafficking.

Conclusions:

  • PKB/Akt and PIKfyve are identified as novel regulators of functional CFTR.
  • These regulators specifically enhance wild-type CFTR activity and protein abundance.
  • The findings suggest a potential therapeutic strategy targeting PKB/Akt and PIKfyve for cystic fibrosis.