Abstract
Astroglia are essential to the development, homeostasis, and metabolic support of the brain but also to the formation and regulation of synaptic circuits. Experimental evidence has been emerging that astrocytes undergo substantial structural plasticity associated with age- and use-dependent changes in neural circuitries. The underlying cellular mechanisms are poorly understood, mainly due to the extraordinary complex, essentially nanoscopic morphology of astroglia. It appears that key morphological changes occur in fine astrocytic processes that are in the vicinity of synapses. However, the characteristic size of these compartment falls below the diffraction limit of conventional optical microscopy, making the deciphering of their molecular nanostructure a challenge.
Here we detail a superresolution microscopy approach that relies on direct stochastic optical reconstruction microscopy (dSTORM) to visualize astroglial organization on the nanoscale (in fixed brain tissue). We also provide a protocol for viral infection of astroglia in vivo (aimed at monitoring the cell activity with the genetically encoded calcium indicator GCaMP), followed by tissue sectioning, immunolabeling, and the subsequent dSTORM analysis. The presented workflow can be extended to a correlational-study protocol to reconstruct the nanoscopic morphology of the imaged cells.
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Acknowledgments
This research was supported by European Union's Horizon 2020 research and innovation program (Marie Skłodowska-Curie grant agreement 798644-AstroMiRimage), Wellcome Trust Principal Fellowship (101896), European Research Council Advanced Grant (323113-NETSIGNAL), FP7 ITN (606950 EXTRABRAIN), and European Commission NEUROTWIN Grant (857562).
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Heller, J.P., Reynolds, J.P., Rusakov, D.A. (2020). Multicolor Superresolution Microscopy: Revealing the Nano World of Astrocytes In Situ. In: Wacker, I., Hummel, E., Burgold, S., Schröder, R. (eds) Volume Microscopy . Neuromethods, vol 155. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0691-9_2
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