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Pixel-based criteria-oriented analysis of time-lapse Ca2+-fluorescence images
Jürgen J Lorenz1, Matthias G O Lorenz, Jeffery L Barker
1Laboratory of Neurophysiology, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bldg 36, Rm 4A26, 9000 Rockville Pike, Bethesda, MD 20892-4123, USA. jlorenz@mail.nih.gov
Journal of Neuroscience Methods
|August 9, 2003
Summary
We developed a novel pixel-based analysis for Ca2+ imaging, preserving spatial resolution. This method reveals extracellular Ca2+ influences on intracellular Ca2+ in developing hippocampal cells.
Area of Science:
- Neuroscience
- Cell Biology
- Biophysics
Background:
- Time-lapse Ca2+ imaging analysis often sacrifices spatial resolution for temporal resolution.
- Regions of Interest (ROI) based analysis limits detailed spatial examination of calcium dynamics.
Purpose of the Study:
- To develop a pixel-based analysis strategy for Ca2+ imaging that maintains spatial resolution.
- To investigate extracellular Ca2+ (Ca(e)(2+)) contributions to intracellular Ca2+ (Ca(i)(2+)) in developing hippocampal cells.
Main Methods:
- Developed a pixel-based Criteria of Interest (COI) strategy for analyzing fluorescence values pixel-by-pixel.
- Grouped pixels based on fluorescence values over time and visualized distributions in pseudo-colored maps.
- Applied the strategy to cultured embryonic hippocampal cells under varying Ca(e)(2+) conditions.
Main Results:
- Discovered distinct, emergent patterns of Ca(e)(2+)-dependent Ca(i)(2+) regulation in early hippocampal cell differentiation.
- Identified Ca(e)(2+)-dependent Ca(i)(2+) patterns that were not confined to inter-cell variations.
- Demonstrated subcellular distribution patterns of Ca(i)(2+) signaling.
Conclusions:
- Pixel-based COI analysis effectively preserves and utilizes the acquired spatial resolution of Ca2+ imaging.
- This strategy reveals novel insights into the emergence and subcellular distribution of Ca(e)(2+)-dependent Ca(i)(2+) signaling.
- The method offers a valuable tool for studying Ca2+ dynamics at subcellular resolution in developmental neuroscience.