Measurement of cystic fibrosis transmembrane conductance regulator activity using fluorescence spectrophotometry
Abstract: Cystic fibrosis (CF) is a frequent autosomal recessive disease caused by mutations that impair the CF transmembrane conductance regulator (CFTR) protein function. CFTR is a chloride channel activated by cyclic AMP (cAMP) via protein kinase A (PKA) and ATP hydrolysis. We describe here a method to measure CFTR activity in a monolayer of cultured cells using a fluorescence spectrophotometer and the chloridesensitive probe 6-methoxy-N-(3-sulfopropyl)quinolinium (SPQ). Modifying a slice holder, the spectrophotometer quartz cuvette was converted in a perfusion chamber, allowing measurement of CFTR activity in real time, in a monolayer of T84 colon carcinoma cells. The SPQ Stern–Volmer constant (KCl ) for chloride in water solution was 115.0 ± 2.8 M1 , whereas the intracellular KCl was 17.8 ± 0.8 M1 , for T84 cells. A functional analysis was performed by measuring CFTR activity in T84 cells. The CFTR transport inhibitors CFTR(inh)-172 (5 lM) and glibenclamide (100 lM) showed a significant reduction (P < 0.05) in CFTR activity. This simple method allows measuring CFTR activity in a very simple, reproducible, and sensitive way.
| Main Authors: | , , , |
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| Format: | Artículo biblioteca |
| Language: | eng |
| Published: |
Elsevier
2011
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| Subjects: | FIBROSIS QUÍSTICA, CANAL DE CLORURO, ESPECTROFOTOMETRÍA, REGULADOR DE CONDUCTANCIA TRANSMEMBRANA DE LA FIBROSIS QUÍSTICA, FLUORESCENCIA, |
| Online Access: | https://repositorio.uca.edu.ar/handle/123456789/14595 |
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