Title | Accurate measurement of fast endocytic recycling kinetics in real time. |
Publication Type | Journal Article |
Year of Publication | 2020 |
Authors | Jonker CTH, Deo C, Zager PJ, Tkachuk AN, Weinstein AM, Rodriguez-Boulan E, Lavis LD, Schreiner R |
Journal | J Cell Sci |
Volume | 133 |
Issue | 2 |
Date Published | 2020 Jan 22 |
ISSN | 1477-9137 |
Keywords | Endocytosis, Humans, Kinetics, Protein Transport |
Abstract | <p>The fast turnover of membrane components through endocytosis and recycling allows precise control of the composition of the plasma membrane. Endocytic recycling can be rapid, with some molecules returning to the plasma membrane with a half time <5 min. Existing methods to study these trafficking pathways utilize chemical, radioactive or fluorescent labeling of cell surface receptors in pulse-chase experiments, which require tedious washing steps and manual collection of samples. Here, we introduce a live-cell endocytic recycling assay based on a newly designed cell-impermeable fluorogenic ligand for HaloTag, Janelia Fluor 635i (JFi, where i indicates impermeant), which allows real-time detection of membrane receptor recycling at steady state. We used this method to study the effect of iron depletion on transferrin receptor (TfR) recycling using the chelator desferrioxamine. We found that this perturbation significantly increases the TfR recycling rate. The high temporal resolution and simplicity of this assay provides a clear advantage over extant methods and makes it ideal for large scale cellular imaging studies. This assay can be adapted to examine other cellular kinetic parameters such as protein turnover and biosynthetic trafficking.</p> |
DOI | 10.1242/jcs.231225 |
Alternate Journal | J Cell Sci |
PubMed ID | 31843759 |
PubMed Central ID | PMC6983720 |
Grant List | R01 DK029857 / DK / NIDDK NIH HHS / United States R01 EY008538 / EY / NEI NIH HHS / United States R01 GM025662 / GM / NIGMS NIH HHS / United States R01 GM034107 / GM / NIGMS NIH HHS / United States |