What question did this study set out to answer?

To characterize calcium currents, monitor intracellular Ca2+ transients upon stimulation, and identify the types of functional calcium channels in cultured rat Purkinje cells.

July 1, 1989Journal of NeuroscienceOpen Access

Fura-2 measurements of cultured rat Purkinje neurons show dendritic localization of Ca2+ influx

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Authors

PHPhilip E. HockbergerNorthwestern University HTHY TsengAT&T (United States)JCJ. A. ConnorUniversity of Iowa

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Implication

In vitro study demonstrates localized dendritic calcium influx in cultured rat Purkinje neurons, indicating specialized regional expression of voltage- and receptor-operated channels.

Key Points

To characterize calcium currents, monitor intracellular Ca2+ transients upon stimulation, and identify the types of functional calcium channels in cultured rat Purkinje cells.
Conducted whole-cell voltage-clamp recordings on cultured rat Purkinje neurons bathed in TTX-TEA-BaCl2 saline.
Injected cells with fura-2 to image intracellular Ca2+ levels during local application of high-potassium saline, glutamate, or glutamate analogs.
Evaluated channel subtypes pharmacologically using selective blockers, including nifedipine, 2-amino-5-phosphonovaleric acid (APV), and LaCl3.
Intracellular Ca2+ elevations occurred preferentially in specific dendrites rather than universally across all dendrites or the soma following high-potassium or glutamate stimulation.
High-potassium-induced Ca2+ conductance was blocked dose-dependently by nifedipine (ED50 = 5 x 10^-7 M), indicating the presence of high-threshold voltage-dependent calcium channels.
Glutamate- and NMDA-mediated Ca2+ responses were reduced by APV (ED50 = 10^-4 M), nifedipine, and 10^-4 M LaCl3, demonstrating the activation of both voltage-gated and glutamate-coupled channels.

Cite This Study

Hockberger et al. (1989) studied this question.

synapsesocial.com/papers/6a915f9d1fac8a9c65dd47c3 https://doi.org/10.1523/jneurosci.09-07-02272.1989

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Implication

In vitro study demonstrates localized dendritic calcium influx in cultured rat Purkinje neurons, indicating specialized regional expression of voltage- and receptor-operated channels.

Fura-2 measurements of cultured rat Purkinje neurons show dendritic localization of Ca2+ influx

Discussion

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Implication

Key Points

Cite This Study

Fura-2 measurements of cultured rat Purkinje neurons show dendritic localization of Ca2+ influx

Discussion

Member takes

Implication

Key Points

Cite This Study

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