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Accurately measuring cystic fibrosis transmembrane conductance regulator (CFTR) function is crucial for evaluating new therapies. This study establishes a benchmark for CFTR activity in healthy individuals, revealing a significant range in sweat response.

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Area of Science:

  • Physiology
  • Genetics
  • Pharmacology

Background:

  • Cystic fibrosis (CF) is a genetic disease caused by reduced activity of the cystic fibrosis transmembrane conductance regulator (CFTR) anion channel.
  • Small molecule therapies partially restore CFTR function, necessitating accurate methods to assess CFTR activity in vivo.
  • Current in vivo CFTR activity measurements vary widely, highlighting the need for reliable benchmarks.

Purpose of the Study:

  • To establish a precise benchmark for CFTR activity in healthy control subjects using the sweat rate ratio (β/M).
  • To quantify the range of CFTR activity in a healthy population to facilitate comparison with CF patients and treatment responses.

Main Methods:

  • Analysis of the β/M sweat rate ratio in 50 healthy adults.
  • Repeated measurements (3x) of sweat rates stimulated by cholinergic and β-adrenergic agonists in approximately 50 identified sweat glands per individual.
  • Compilation of approximately 20,000 individual sweat gland measurements.

Main Results:

  • The study identified an approximately 7-fold range in CFTR activity among healthy adults, from 26% to 187% of the wild-type (WT) average.
  • The WT average CFTR activity was normalized to 100% for comparison.
  • Significant variation in CFTR activity was observed within the healthy control group.

Conclusions:

  • The established β/M ratio benchmark provides a critical reference for evaluating CFTR function in CF patients undergoing treatment.
  • Understanding the natural variation in CFTR activity in healthy individuals is essential for interpreting therapeutic efficacy.
  • Further investigation into factors contributing to β/M variation in healthy controls is warranted.