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Fluorescent labelling of membrane fatty acid transporter CD36 (SR-B2) in the extracellular loop.
oleh: Yilin Liu, Ricardo Rodriguez-Calvo, Shujin Wang, Xiaoqing Zhu, Jos L V Broers, Jan F C Glatz, Joost J F P Luiken, Dietbert Neumann
| Format: | Article |
|---|---|
| Diterbitkan: | Public Library of Science (PLoS) 2019-01-01 |
Deskripsi
<h4>Context</h4>Upon palmitate oversupply, membrane fatty acid-transporter CD36 (SR-B2) permanently translocates from endosomal storage to the sarcolemma, inducing lipotoxicity. CD36 translocation results from endosomal alkalinisation elicited by palmitate-induced disattachment of the cytoplasmic V1-subcomplex from the membrane-integrated V0-subcomplex of vacuolar-type H+-ATPase.<h4>Objective</h4>Develop a CD36 fluorescent labeling technique as initial step towards live cell imaging.<h4>Methods</h4>Three human CD36 (hCD36) mutants were constructed via insertion of a tetracysteine motif at different positions within the extracellular domain. Constructs were lentivirally transduced for subsequent CD36 labeling with fluorescein-arsenical hairpin-binder (FlAsH). Cell imaging was combined with V0/V1 immunostaining and Western blotting.<h4>Results</h4>Transduction of hCD36-wildtype and mutants yielded corresponding proteins in HL-1 cardiomyocytes. Tetracysteine mutant-2 (hCD36-TC2) showed similar fatty acid uptake to wildtype. FlAsH staining revealed a speckled pattern reminiscent of endosomes. We found decreased V1 co-localization with CD36 upon high-palmitate culturing. Conversely, V0 consistently co-localized with CD36.<h4>Conclusion</h4>hCD36-TC2 is a possible candidate for application of biarsenical dyes in live imaging studies pending further investigation. Our data is compatible with V0/V1 disassembly in high-palmitate-treated cells.