Cftr Recycling
Cftr Recycling - Related Videos
10:05
In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Cited by 7 •
2012
Cystic fibrosis transmembrane conductance regulator (CFTR), an epithelial chloride channel, has been reported to interact with various proteins and regulate important cellular processes; among them the CFTR PDZ motif-mediated interactions have been well documented. This protocol describes methods we developed to assemble a PDZ-dependent CFTR macromolecular signaling complex in vitro.
05:59
Self-report vs. Behavioral Measures of Recycling
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2023
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University One of the challenges in measuring an experimental variable is identifying the technique that will produce the more accurate measurement. The most common way to measure a dependent variable is self-report—asking the participant to describe his/her feelings, thoughts, or behaviors. Yet, people may not be honest. To truly know something about a participant, it may be necessary to see what they...
09:59
Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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Cited by 7 •
2015
Described here is a rapid and effective procedure for functional reconstitution of purified wild-type and mutant CFTR protein that preserves activity for this chloride channel, which is defective in Cystic Fibrosis. Iodide efflux from reconstituted proteoliposomes mediated by CFTR allows studies of channel activity and the effects of small molecules.
08:36
FM Dyes in Vesicle Recycling
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2023
FM dyes are a class of fluorescent molecules that has found important use in studying the vesicle recycling process. By virtue of a chemical structure, these molecules can insert themselves into the outer leaflet of phospholipid bilayer membranes. After membrane insertion, they are internalized into the cell via endocytosed vesicles, and released when these vesicles recycle back to the membrane. Since, these dyes fluoresce strongly in the hydrophobic environment within membranes and weakly in...
02:42
Analyzing Synaptic Vesicle Recycling and Fluorescent Dye Uptake in Drosophila Larvae
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2025
This video demonstrates a protocol to study synaptic vesicle recycling at neuromuscular junctions in channelrhodopsin-expressing Drosophila larvae using a fluorescent dye. Blue light activates the channelrhodopsins, causing calcium influx and synaptic vesicle exocytosis. The dye integrates into the neuronal membranes and is internalized during endocytosis, resulting in enhanced fluorescence. Further blue light stimulation induces exocytosis and dye release, which is shown by reduced...
FAQs
After CFTR undergoes endocytosis, the internalized channel enters intracellular trafficking compartments where it can be sorted into different routes. One route returns it to the cell surface through recycling pathways, while another directs it toward degradation. This sorting decision helps determine whether previously surface-localized CFTR remains available for epithelial ion transport or is permanently removed.
Sorting compartments act as decision points for internalized CFTR. They help direct the channel either toward delivery back to the plasma membrane or toward degradation. Because these routes produce opposite effects on surface CFTR abundance, trafficking through these compartments influences how much functional channel reaches the apical membrane and, consequently, how effectively epithelial cells regulate ion and fluid movement.
The balance determines whether internalized CFTR is restored to the cell surface or lost through degradation. Greater delivery through recycling pathways can preserve the pool of functional apical channels, whereas increased degradation can reduce that pool. This distinction is important because CFTR abundance at the membrane directly influences chloride and bicarbonate movement across epithelial tissues.
By regulating the amount of CFTR present at the apical membrane, recycling affects chloride and bicarbonate transport across epithelial cells. These ion movements contribute to water balance and epithelial fluid secretion. Consequently, altered trafficking can change the physiological output of an epithelium even when the central issue concerns the channel’s cellular localization rather than its presence in the cell.
A pathway-level analysis should follow CFTR from its retrieval at the plasma membrane through endocytosis and intracellular sorting, then assess whether it reaches recycling pathways, returns to the cell surface, or enters degradation. Examining these sequential outcomes helps distinguish a defect in internalization, trafficking, surface delivery, or persistence from a general reduction in CFTR abundance.
CFTR recycling provides a framework for understanding how trafficking defects can reduce functional channel abundance at the epithelial surface. Studying this pathway therefore connects cellular transport events with impaired ion movement, water balance, and fluid secretion. It also supports treatment research aimed at restoring CFTR abundance and activity at the membrane rather than focusing only on channel production.