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Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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Characterization of a 7,8-benzoflavone double effect on CFTR Cl(-) channel activity

Loretta Ferrera1, Chiara Pincin, Oscar Moran

  • 1Istituto di Biofisica, CNR, Via De Marini 6, 16149, Genoa, Italy.

The Journal of Membrane Biology
|September 19, 2007
PubMed

Insights

The flavone UCCF-029 acts as a dual-action modulator for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. Low concentrations activate CFTR, while high concentrations inhibit it, suggesting a complex regulatory mechanism.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Pharmacology

Background:

  • The human cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP-binding cassette transporter forming a chloride channel.
  • Mutations in CFTR cause cystic fibrosis, a significant genetic disease.
  • Understanding CFTR regulation is crucial for developing effective therapies.

Purpose of the Study:

  • To investigate the molecular mechanism of the flavone UCCF-029 as a CFTR potentiator.
  • To elucidate the interaction between UCCF-029 and CFTR at the molecular level.
  • To determine how UCCF-029 modulates CFTR channel activity.

Main Methods:

  • Utilized the patch-clamp technique in the excised inside-out configuration.
  • Studied the CFTR channel activity on a phosphorylated channel with low ATP concentration.
  • Applied varying concentrations of the flavone UCCF-029.

Main Results:

  • Low concentrations (<50 nM) of UCCF-029 increase CFTR open probability, favoring activation.
  • High concentrations (>50 nM) of UCCF-029 inhibit CFTR by reducing total open time.
  • UCCF-029 does not alter CFTR's response to varying ATP concentrations.

Conclusions:

  • UCCF-029 potentiates CFTR by binding to a specific site, potentially promoting dimer formation.
  • The potentiator likely acts at an independent site, not interfering with ATP binding.
  • UCCF-029 directly modulates CFTR channel activity, offering therapeutic potential.

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