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Fluorescent imaging of Zinc in rat hippocampusChintha Bastian
Dr. Yang Li
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Zinc in the brain
Brief review most of which was discussed by Josh Ketterman
Indicators used for imaging
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Overview
Histochemically reactive Zn2+ is found in a subset of glutamatergic nerve terminals throughout mammalian cortex and limbic region (Frederickson et al. 2000)
Studies have shown most of the histochemically staining Zn2+ localized within synaptic vesicles of glutamatergic neurons. (Frederickson et al. 1983; Huang 1967; Perez- Clausell and Danscher 1985)
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Courtesy Frederickson et al, Journal of Nutrition 2000
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Rapid Translocation of Zn2+ From Presynaptic Terminals Into Postsynaptic Hippocampal Neurons After Physiological Stimulation
Yang Li, Christopher J. Hough, Sang Won Suh, John M. Sarvey and Christopher J. Frederickson
Journal of Neurophysiology • VOL 86 • NOVEMBER 2001
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Why do we study the role of Zinc in our lab?
Zinc has been indicated in many pathological processes in the brain like
Epilepsy Alzheimer's disease Ischemia to the brain
Also, LTP and Memory!
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Experimental animals
Adult male Sprague Dawley rats Weight >150 g Brain slices prepared using a Vibratome
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Newport green
Newport green dipotassium salt cell impermeable for extracellular imaging
Dissociation constant Kd = ~1μM Sensitive to Zn2+
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Artificial cerebrospinal fluid
ACSF124 mM NaCl, 1.75 mM KCl, 1.3 mM MgSO4,
2.4 mM CaCl2, 1.25 mM KH2PO4, 26 mM NaHCO3, and 10 mM dextrose continuously bubbled with 95% O2 and 5% CO2 (pH 7.4)
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Stimulation parameters used
0.5-mA pulses at 100 Hz for 5 sec.
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Dentate Gyrus
CA1
CA3Hilar region
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20µM Newport Green
Electrical stimulation 25 mM KCl
Courtesy Li et al 2000.
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Stimulation induced release of Zinc when perfused with 20µM Newport Green
Courtesy: Li et al 2000
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Courtesy: Li et al 2000
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Courtesy: Li et al 2000
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Courtesy: Li et al 2000
2µM TTX
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Determination of Zinc concentration
•F is the measured fluorescence intensity.
•Fmax obtained by measuring the dye fluorescence in the presence of 1 mM ZnCl2 added to the ACSF bathing the slice
•Fmin obtained by removing the Zn2+ by perfusing with Zn2+ free ACSF, and then measuring the dye fluorescence again during
perfusion with Zn2+ free ACSF plus 10 mM Ca-EDTA.
[Zn2+ = Kd (F - F min)/(F max- F)
Grynkiewicz et al. (1985)
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Intracellular Zinc imaging
Newport Green diacetate 50µM, 0.1% pluronic acid and 0.5% DMSO for one hour
NG washed out with ACSF
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NG diacetate and stimulation (100Hz for 10sec)
Courtesy: Li et al 2000
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10mM 10µM
Courtesy: Li et al 2000
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Courtesy: Li et al 2000
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Drawbacks of the paper
Calcium EDTA 10 mM Why? Graph obtained after adding KCl to
extracellular Newport Green solution Incubated the slices in Newport Green for
half an hour
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Current research
Zeiss LSM 510 laser scanning inverted Confocal Microscope
10 µM Newport Green (impermeant) shorter incubation time
100 Hz for 10 sec Comparing action of other dyes
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10 µM Newport Green
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Regions of interest!!
LSM Toolbox v2.10c (http://rct-cjs3.physiol.cam.ac.uk/C4/cjs/AnalysisProgram/program.html)
ROI 1
ROI 2
ROI 3
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Data as reported on April 8 ,2005 by Chintha Bastian
Electrical Stimulation of Hippocampus
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1 5 9 13 17 21 25 29 33 37 41 45 49
Time in Seconds
Flu
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In
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ROI1 ROI2 ROI3
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Courtesy : Handbook, Molecular probes, Invitrogen detection technologies
Kd ~ 1µM
(Molecular probes)
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Zinpyr-4
Courtesy: Shawn Burdette et al 2003; ZP4, an
Improved Neuronal Zn2+ Sensor of the Zinpyr Family
Kd ~ 1nM (Frederickson et al)
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Courtesy : Handbook, Molecular probes, Invitrogen detection technologies
Kd ~15nM
(Molecular probes)
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Future studies
Role of Zinc in epilepsy
causative , contributive or curative? Recurrent mossy fibers releasing Zinc in
the molecular layer Translocation of Zinc
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Thanks!
Dr. Yang Li Josh Ketterman Christian Stork Jennifer Martin Yanli Ding
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Questions???