DOI: 10.1101/508176Dec 30, 2018Paper

Fluorescence Microscopy of Piezo1 in Droplet Hydrogel Bilayers

BioRxiv : the Preprint Server for Biology
Oskar B JaggersMatthew A B Baker


Mechanosensitive ion channels are membrane gated pores which are activated by mechanical stimuli. The focus of this study is on Piezo1, a newly discovered, large, mammalian, mechanosensitive ion channel, which has been linked to diseases such as dehydrated hereditary stomatocytosis (Xerocytosis) and lymphatic dysplasia. Here we utilize an established in-vitro artificial bilayer system to interrogate single Piezo1 channel activity. The droplet-hydrogel bilayer (DHB) system uniquely allows the simultaneous recording of electrical activity and fluorescence imaging of labelled protein. We successfully reconstituted fluorescently labelled Piezo1 ion channels in DHBs and verified activity using electrophysiology in the same system. We demonstrate successful insertion and activation of hPiezo1-GFP in bilayers of varying composition. Furthermore, we compare the Piezo1 bilayer reconstitution with measurements of insertion and activation of KcsA channels to reproduce conductances reported in the literature. Together, our results showcase the use of DHBs for future experiments allowing simultaneous measurements of ion channel gating while visualising the channel proteins using fluorescence.

Related Concepts

Ion Channel
Lipid Bilayers
Microscopy, Fluorescence
Green Fluorescent Proteins
Hennekam Lymphangiectasia Lymphedema Syndrome
Fluorescence Imaging

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