Two-Photon Excitation of Potentiometric Probes Enables Optical Recording of Action Potentials From Mammalian Nerve Terminals In Situ
| Autor: | Cristin G. Welle, Brian M. Salzberg, Jonathan A. N. Fisher, Gi-Ho Kim, Diego Contreras, A. L. Obaid, Arjun G. Yodh, Paul Kosterin, Jonathan R. Barchi |
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| Rok vydání: | 2008 |
| Předmět: |
Neurons
Materials science Absorption spectroscopy Optical sectioning Physiology General Neuroscience Presynaptic Terminals Action Potentials Pyridinium Compounds In Vitro Techniques Fluorescence Mice Spectrometry Fluorescence Microscopy Electron Transmission Two-photon excitation microscopy Optical recording Electrode Fluorescence microscope Biophysics Animals Female Pituitary Gland Intermediate Excitation Fluorescent Dyes |
| Zdroj: | Journal of Neurophysiology. 99:1545-1553 |
| ISSN: | 1522-1598 0022-3077 |
| DOI: | 10.1152/jn.00929.2007 |
| Popis: | We report the first optical recordings of action potentials, in single trials, from one or a few (approximately 1-2 microm) mammalian nerve terminals in an intact in vitro preparation, the mouse neurohypophysis. The measurements used two-photon excitation along the "blue" edge of the two-photon absorption spectrum of di-3-ANEPPDHQ (a fluorescent voltage-sensitive naphthyl styryl-pyridinium dye), and epifluorescence detection, a configuration that is critical for noninvasive recording of electrical activity from intact brains. Single-trial recordings of action potentials exhibited signal-to-noise ratios of approximately 5:1 and fractional fluorescence changes of up to approximately 10%. This method, by virtue of its optical sectioning capability, deep tissue penetration, and efficient epifluorescence detection, offers clear advantages over linear, as well as other nonlinear optical techniques used to monitor voltage changes in localized neuronal regions, and provides an alternative to invasive electrode arrays for studying neuronal systems in vivo. |
| Databáze: | OpenAIRE |
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