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In vivo two-photon imaging of sensory-evoked dendritic calcium signals in cortical neurons

Abstract

Neurons in cortical sensory regions receive modality-specific information through synapses that are located on their dendrites. Recently, the use of two-photon microscopy combined with whole-cell recordings has helped to identify visually evoked dendritic calcium signals in mouse visual cortical neurons in vivo. The calcium signals are restricted to small dendritic domains ('hotspots') and they represent visual synaptic inputs that are highly tuned for orientation and direction. This protocol describes the experimental procedures for the recording and the analysis of these visually evoked dendritic calcium signals. The key points of this method include delivery of fluorescent calcium indicators through the recording patch pipette, selection of an appropriate optical plane with many dendrites, hyperpolarization of the membrane potential and two-photon imaging. The whole protocol can be completed in 5–6 h, including 1–2 h of two-photon calcium imaging in combination with stable whole-cell recordings.

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Figure 1: Experimental arrangement for in vivo dendritic imaging in combination with whole-cell recordings.
Figure 2: In vivo two-photon imaging of visually evoked dendritic calcium signals.
Figure 3: Extraction of local dendritic calcium transients from two-photon images.

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Acknowledgements

We are grateful to Y. Kovalchuk for his help in the initial experiments. This study was supported by grants from Deutsche Forschungsgemeinschaft (DFG) to A.K. and from the Friedrich Schiedel Foundation. A.K. is a Carl von Linde Senior Fellow of the Institute for Advanced Study of the Technische Universität München. H.J. and N.L.R. were supported by the DFG (IRTG 1373).

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H.J., N.L.R., X.C. and A.K. performed the experiments and the analysis. H.J. developed the program for data analysis. A.K. wrote the paper together with H.J., N.L.R. and X.C.

Corresponding author

Correspondence to Arthur Konnerth.

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The authors declare no competing financial interests.

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Jia, H., Rochefort, N., Chen, X. et al. In vivo two-photon imaging of sensory-evoked dendritic calcium signals in cortical neurons. Nat Protoc 6, 28–35 (2011). https://doi.org/10.1038/nprot.2010.169

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