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  • Open Access

Fast functional imaging of multiple brain regions in intact zebrafish larvae using Selective Plane Illumination Microscopy

  • 1Email author,
  • 1,
  • 2, 3, 4, 5,
  • 1,
  • 2, 3, 4, 5,
  • 2, 3, 4, 5 and
  • 1
BMC Neuroscience201314 (Suppl 1) :P97

https://doi.org/10.1186/1471-2202-14-S1-P97

  • Published:

Keywords

  • Functional Imaging
  • Laser Sheet
  • Zebrafish Larva
  • Recorded Neuron
  • Acquisition Speed
The optical transparency and the small dimensions of zebrafish at the larval stage make it a vertebrate model of choice for brain-wide in-vivo functional imaging. However, current point-scanning imaging techniques, such as two-photon or confocal microscopy, impose a strong limit on acquisition speed which in turn sets the number of neurons that can be simultaneously recorded [1]. At 5 Hz, this number is of the order of one thousand, i.e. approximately 1-2% of the brain. We demonstrate that this limitation can be greatly overcome by using Selective-Plane Illumination Microscopy (SPIM) [24]. Zebrafish larvae expressing the genetically encoded calcium indicator GCaMP3 were illuminated with a scanned laser sheet and imaged with a camera whose optical axis was oriented orthogonally to the illumination plane. This optical sectioning approach was shown to permit functional imaging of most of the brain volume of 5-9 day old larvae with single-cell resolution. The spontaneous activity of up to 5000 neurons was recorded at 20 Hz for 20-60 min. By rapidly scanning the specimen in the axial direction, the activity of 25000 individual neurons from 5 different z-planes (approximately 30% of the entire brain) could be simultaneously monitored at 4 Hz. Compared to point-scanning techniques, this imaging strategy thus yields a ~20-fold increase in data throughput (number of recorded neurons times acquisition rate) without compromising the signal-to-noise ratio. The extended field of view offered by the SPIM method allowed us to directly identify large scale ensembles of neurons, spanning several brain regions (see Figure 1), that displayed correlated activity and were thus likely to participate in common neural processes.
Figure 1
Figure 1

Image of the brain of a 6 day-old GCaMP3 zebrafish obtained by SPIM. Colored neurons indicate a set of neurons showing correlated activity.

Authors’ Affiliations

(1)
CNRS / UPMC Univ, Laboratoire Jean Perrin LJP, Paris 06, FRE 3231, F-75005 Paris, France
(2)
Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, Paris, F-75005, France
(3)
Inserm, U1024, Paris, F-75005, France
(4)
CNRS, UMR 8197, Paris, F-75005, France
(5)
IBENS, ENS, Paris, France

References

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  2. Michael Weber, Jan Huisken: Light sheet microscopy for real-time developmental biology. Curr Opin Genet Dev. 2011, 21 (5): 566-572. 10.1016/j.gde.2011.09.009.View ArticleGoogle Scholar
  3. Jerome Mertz: Optical sectioning microscopy with planar or structured illumination. Nature Methods. 2011, 8 (10): 811-819. 10.1038/nmeth.1709. OctoberView ArticleGoogle Scholar
  4. Raju Tomer, Khaled Khairy, Philipp Keller: Shedding light on the system: studying embryonic development with light sheet microscopy. Curr Opin Genet Dev. 2011, 21 (5): 558-565. 10.1016/j.gde.2011.07.003.View ArticleGoogle Scholar

Copyright

© Candelier et al; licensee BioMed Central Ltd. 2013

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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