This is IMAGE #7 (time point: 8 hour, rapid time lapse)of an image group. It shows a neuron from the optic tectum of an albino Xenopus laevis tadpole CNS, stage 47. This time lapse series captures the dendritic arbor of this neuron every 60 seconds for 10 minutes. Over time, the tadpole (and the neuron) drifts across the field. In the series, z-stacks of this neuron were acquired at a 2 hour interval for 8 hours. Afterward, a second time lapse series was acquired at a 60 second interval for 10 minutes. This time series shows dendritic arbor development and morphological plasticity of the dendritic arbor with branch additions and retractions. The cell was transfected with in vivo electroporation of plasmid DNA encoding eGFP ~24 hours before the image was acquired. The intact, living tadpole was anesthetized, positioned under a glass coverslip and this image was taken directly through its transparent skin using a custom built two-photon microscope.
Specifications of the custom built two-photon microscope, including the laser sources, signal amplification, PMT specifications, and YFP filter sets are described in: Ruthazer ES, Li J, Cline HT. 2006. Stabilization of axon branch dynamics by synaptic maturation. J Neurosci 26(13):3594-3603. The methods of cell transfection with electroporation can be found here: Bestman JE, Ewald RC, Chiu S-L, Cline HT. 2006. In vivo single-cell electroporation for transfer of DNA and macromolecules. Nat Protocols 1(3):1267-1272. Further explanation can be found here: Bestman JE, Cline HT. 2008. The RNA binding protein CPEB regulates dendrite morphogenesis and neuronal circuit assembly in vivo. Proc Natl Acad Sci U S A 105(51):20494-20499. Bestman JE, Cline HT. 2009. The Relationship between Dendritic Branch Dynamics and CPEB-Labeled RNP Granules Captured in Vivo. Front Neural Circuits 3:10.
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