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Sample preparation and warping accuracy for correlative multimodal imaging in the mouse olfactory bulb using 2-photon, synchrotron X-ray and volume electron microscopy

DOI: 10.3389/fcell.2022.880696 DOI Help

Authors: Yuxin Zhang (The Francis Crick Institute; University College London) , Tobias Ackels (The Francis Crick Institute; University College London) , Alexandra Pacureanu (The Francis Crick Institute; University College London; ESRF, The European Synchrotron) , Marie-Christine Zdora (University College London; Diamond Light Source; University of Southampton; Paul Scherrer Institut) , Anne Bonnin (Paul Scherrer Institute) , Andreas T. Schaefer (The Francis Crick Institute; University College London) , Carles Bosch (The Francis Crick Institute)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Frontiers In Cell And Developmental Biology , VOL 10

State: Published (Approved)
Published: June 2022
Diamond Proposal Number(s): 20274

Open Access Open Access

Abstract: Integrating physiology with structural insights of the same neuronal circuit provides a unique approach to understanding how the mammalian brain computes information. However, combining the techniques that provide both streams of data represents an experimental challenge. When studying glomerular column circuits in the mouse olfactory bulb, this approach involves e.g., recording the neuronal activity with in vivo 2-photon (2P) calcium imaging, retrieving the circuit structure with synchrotron X-ray computed tomography with propagation-based phase contrast (SXRT) and/or serial block-face scanning electron microscopy (SBEM) and correlating these datasets. Sample preparation and dataset correlation are two key bottlenecks in this correlative workflow. Here, we first quantify the occurrence of different artefacts when staining tissue slices with heavy metals to generate X-ray or electron contrast. We report improvements in the staining procedure, ultimately achieving perfect staining in ∼67% of the 0.6 mm thick olfactory bulb slices that were previously imaged in vivo with 2P. Secondly, we characterise the accuracy of the spatial correlation between functional and structural datasets. We demonstrate that direct, single-cell precise correlation between in vivo 2P and SXRT tissue volumes is possible and as reliable as correlating between 2P and SBEM. Altogether, these results pave the way for experiments that require retrieving physiology, circuit structure and synaptic signatures in targeted regions. These correlative function-structure studies will bring a more complete understanding of mammalian olfactory processing across spatial scales and time.

Journal Keywords: staining; warping; olfactory bulb; 2-photon calcium imaging; synchrotron X-ray; volume EM; correlative multimodal imaging

Subject Areas: Biology and Bio-materials, Technique Development

Instruments: I13-2-Diamond Manchester Imaging

Other Facilities: TOMCAT at SLS

Added On: 27/06/2022 13:33


Discipline Tags:

Health & Wellbeing Technique Development - Life Sciences & Biotech Neurology Biophysics Life Sciences & Biotech

Technical Tags:

Imaging Tomography