Expansion microscopy of axonemal dyneins in islet primary cilia
Dong, X.; Cho, J. H.; Hughes, J. W.
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Primary cilia are vital sensory organelles whose structures are challenging to study due to their solitary nature and intricate cytoskeleton. Current imaging modalities are limited in their ability to visualize structural details that are important for understanding primary cilia function. Ultrastructure expansion microscopy (U-ExM) is a recent superresolution imaging technique that physically expands biological specimens using a swellable hydrogel, allowing structural interrogation of small cellular components such as cilia. In this study, we apply U-ExM to mouse and human pancreatic islets to visualize the axonemal cytoskeleton and associated proteins in primary cilia. Our study reveals the expression of axonemal dynein in islet primary cilia and centrioles, with DNAI1 being a principal subunit which we validate using targeted shRNA knockdown. We conclude that U-ExM is suitable for localizing protein expression in pancreatic islet cilia which contain axonemal dynein.
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