A Little CFTR Goes a Long Way: CFTR-Dependent Sweat Secretion from G551D and R117H-5T Cystic Fibrosis Subjects Taking Ivacaftor

To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32-143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G55...

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Published inPloS one Vol. 9; no. 2; p. e88564
Main Authors Char, Jessica E., Wolfe, Marlene H., Cho, Hyung-ju, Park, Il-Ho, Jeong, Jin Hyeok, Frisbee, Eric, Dunn, Colleen, Davies, Zoe, Milla, Carlos, Moss, Richard B., Thomas, Ewart A. C., Wine, Jeffrey J.
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 10.02.2014
Public Library of Science (PLoS)
Subjects
Acetylcholine receptors (muscarinic)
Amino Acid Substitution - genetics
Aminophenols - pharmacology
Aminophenols - therapeutic use
Analysis
Bioassays
Biology
Case-Control Studies
Chloride
Cystic fibrosis
Cystic Fibrosis - drug therapy
Cystic Fibrosis - genetics
Cystic Fibrosis Transmembrane Conductance Regulator - genetics
Data processing
FDA approval
Female
Glands
Humans
Laboratories
Male
Medicine
Mutation
Pediatrics
Quinolones - pharmacology
Quinolones - therapeutic use
Receptors
Secretion
Studies
Suidae
Sweat
Sweat - drug effects
Sweat - metabolism
Sweat Glands - drug effects
Sweat Glands - metabolism
Sweat Glands - pathology
Sweating
Transcription
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ISSN1932-6203
1932-6203
DOI10.1371/journal.pone.0088564

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Abstract To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32-143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (-) ivacaftor, 3 only (+) ivacaftor and 3 (+/-) ivacaftor (1-5 tests per condition). The total number of gland measurements was 852 (-) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a β-adrenergic cocktail that elevated [cAMP]i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3-74% of glands responded with C/M sweat ratios 0.04%-2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor  = 1.6%-7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.
AbstractList To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32-143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (-) ivacaftor, 3 only (+) ivacaftor and 3 (+/-) ivacaftor (1-5 tests per condition). The total number of gland measurements was 852 (-) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a [beta]-adrenergic cocktail that elevated [cAMP].sub.i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3-74% of glands responded with C/M sweat ratios 0.04%-2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor = 1.6%-7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.
To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32-143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (-) ivacaftor, 3 only (+) ivacaftor and 3 (+/-) ivacaftor (1-5 tests per condition). The total number of gland measurements was 852 (-) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a β-adrenergic cocktail that elevated [cAMP]i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3-74% of glands responded with C/M sweat ratios 0.04%-2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor  = 1.6%-7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32-143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (-) ivacaftor, 3 only (+) ivacaftor and 3 (+/-) ivacaftor (1-5 tests per condition). The total number of gland measurements was 852 (-) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a β-adrenergic cocktail that elevated [cAMP]i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3-74% of glands responded with C/M sweat ratios 0.04%-2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor  = 1.6%-7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.
To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32-143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (-) ivacaftor, 3 only (+) ivacaftor and 3 (+/-) ivacaftor (1-5 tests per condition). The total number of gland measurements was 852 (-) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a β-adrenergic cocktail that elevated [cAMP]i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3-74% of glands responded with C/M sweat ratios 0.04%-2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor  = 1.6%-7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.
To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32–143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (−) ivacaftor, 3 only (+) ivacaftor and 3 (+/−) ivacaftor (1–5 tests per condition). The total number of gland measurements was 852 (−) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a β-adrenergic cocktail that elevated [cAMP] i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3–74% of glands responded with C/M sweat ratios 0.04%–2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor  = 1.6%–7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.
To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T mutations, we optically measured sweat secretion from 32–143 individually identified glands in each of 8 CF subjects; 6 F508del/G551D, one G551D/R117H-5T, and one I507del/R117H-5T. Two subjects were tested only (−) ivacaftor, 3 only (+) ivacaftor and 3 (+/−) ivacaftor (1–5 tests per condition). The total number of gland measurements was 852 (−) ivacaftor and 906 (+) ivacaftor. A healthy control was tested 4 times (51 glands). For each gland we measured both CFTR-independent (M-sweat) and CFTR-dependent (C-sweat); C-sweat was stimulated with a β-adrenergic cocktail that elevated [cAMP]i while blocking muscarinic receptors. Absent ivacaftor, almost all CF glands produced M-sweat on all tests, but only 1/593 glands produced C-sweat (10 tests, 5 subjects). By contrast, 6/6 subjects (113/342 glands) produced C-sweat in the (+) ivacaftor condition, but with large inter-subject differences; 3–74% of glands responded with C/M sweat ratios 0.04%–2.57% of the average WT ratio of 0.265. Sweat volume losses cause proportionally larger underestimates of CFTR function at lower sweat rates. The losses were reduced by measuring C/M ratios in 12 glands from each subject that had the highest M-sweat rates. Remaining losses were estimated from single channel data and used to correct the C/M ratios, giving estimates of CFTR function (+) ivacaftor  = 1.6%–7.7% of the WT average. These estimates are in accord with single channel data and transcript analysis, and suggest that significant clinical benefit can be produced by low levels of CFTR function.
Audience Academic
Author Milla, Carlos
Wolfe, Marlene H.
Park, Il-Ho
Frisbee, Eric
Davies, Zoe
Moss, Richard B.
Dunn, Colleen
Thomas, Ewart A. C.
Char, Jessica E.
Jeong, Jin Hyeok
Wine, Jeffrey J.
Cho, Hyung-ju
AuthorAffiliation 1 Cystic Fibrosis Research Laboratory, Stanford University, Stanford, California, United States of America
Tor Vergata University of Rome, Italy
3 Department of Psychology, Stanford University, Stanford, California, United States of America
2 Department of Pediatrics, Stanford University School of Medicine, Stanford, California, United States of America
AuthorAffiliation_xml – name: 3 Department of Psychology, Stanford University, Stanford, California, United States of America
– name: 1 Cystic Fibrosis Research Laboratory, Stanford University, Stanford, California, United States of America
– name: Tor Vergata University of Rome, Italy
– name: 2 Department of Pediatrics, Stanford University School of Medicine, Stanford, California, United States of America
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  surname: Char
  fullname: Char, Jessica E.
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  surname: Wolfe
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– sequence: 3
  givenname: Hyung-ju
  surname: Cho
  fullname: Cho, Hyung-ju
– sequence: 4
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  fullname: Park, Il-Ho
– sequence: 5
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  fullname: Jeong, Jin Hyeok
– sequence: 6
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  surname: Frisbee
  fullname: Frisbee, Eric
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  surname: Dunn
  fullname: Dunn, Colleen
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  givenname: Zoe
  surname: Davies
  fullname: Davies, Zoe
– sequence: 9
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  surname: Milla
  fullname: Milla, Carlos
– sequence: 10
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  surname: Moss
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  givenname: Ewart A. C.
  surname: Thomas
  fullname: Thomas, Ewart A. C.
– sequence: 12
  givenname: Jeffrey J.
  surname: Wine
  fullname: Wine, Jeffrey J.
BackLink https://www.ncbi.nlm.nih.gov/pubmed/24520399$$D View this record in MEDLINE/PubMed
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ContentType Journal Article
Copyright COPYRIGHT 2014 Public Library of Science
2014 Char et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
2014 Char et al 2014 Char et al
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– notice: 2014 Char et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
– notice: 2014 Char et al 2014 Char et al
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Conceived and designed the experiments: JJW. Performed the experiments: JEC MHW HJC IHP JHJ JJW. Analyzed the data: JEC JJW MHW EACT. Contributed reagents/materials/analysis tools: EF EACT. Wrote the paper: JJW EACT RBM JEC. Recruited subjects: CD ZD CM. Supplied relevant clinical data: CD ZD CM. Discussed interpretations: CD ZD CM.
Competing Interests: The authors have declared that no competing interests exist.
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Snippet To determine if oral dosing with the CFTR-potentiator ivacaftor (VX-770, Kalydeco) improves CFTR-dependent sweating in CF subjects carrying G551D or R117H-5T...
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StartPage e88564
SubjectTerms Acetylcholine receptors (muscarinic)
Amino Acid Substitution - genetics
Aminophenols - pharmacology
Aminophenols - therapeutic use
Analysis
Bioassays
Biology
Case-Control Studies
Chloride
Cystic fibrosis
Cystic Fibrosis - drug therapy
Cystic Fibrosis - genetics
Cystic Fibrosis Transmembrane Conductance Regulator - genetics
Data processing
FDA approval
Female
Glands
Humans
Laboratories
Male
Medicine
Mutation
Pediatrics
Quinolones - pharmacology
Quinolones - therapeutic use
Receptors
Secretion
Studies
Suidae
Sweat
Sweat - drug effects
Sweat - metabolism
Sweat Glands - drug effects
Sweat Glands - metabolism
Sweat Glands - pathology
Sweating
Transcription
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Title A Little CFTR Goes a Long Way: CFTR-Dependent Sweat Secretion from G551D and R117H-5T Cystic Fibrosis Subjects Taking Ivacaftor
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https://doaj.org/article/0401acd3a79e4cd98a0cdfc673e9e1c9
http://dx.doi.org/10.1371/journal.pone.0088564
Volume 9
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