What question did this study set out to answer?

To characterize the developmental emergence of active K+-selective channels and determine their contribution to the transition from inexcitable states to spontaneous firing in cultured Purkinje neurons.

June 1, 1988Journal of NeuroscienceOpen Access

Developmental changes in K+-selective channel activity during differentiation of the Purkinje neuron in culture

Q: What is the clinical evidence from this study?

Study design: Other. Population: Neuronal development. Intervention: Developmental maturation (days in vitro) vs. Immature neurons (early days in vitro). Primary outcome: Types and properties of active K+-selective channels.

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Key result

Maturation of cultured Purkinje neurons involves the progressive expression of larger-conductance (70 and 100 pS) K+ channels, which increases sensitivity to TEA and alters spontaneous firing patterns.

Population

Cerebellar Purkinje neurons cultured from 20-day rat embryos

Design

Preclinical

Follow-up

up to 29 days in vitro

Authors

AYAJ YoolThe University of Adelaide VDVE DionneUniversity of California, San Diego DGD.L. GruolScripps Research Institute

Discussion

Member takes

Implication

Hypothesis-generating for K+ channel roles in neuronal maturation; leaves open in vivo or human relevance.

Key Points

To characterize the developmental emergence of active K+-selective channels and determine their contribution to the transition from inexcitable states to spontaneous firing in cultured Purkinje neurons.
Cultured embryonic cerebellar Purkinje neurons from 20-day rat embryos across developmental stages from 5 to 29 days in vitro (DIV).
Characterized active K+-selective channels using patch-clamp electrophysiology under steady-state depolarizing voltage commands.
Assessed spontaneous firing properties and pharmacological sensitivity using intracellular current-clamp recordings and tetraethylammonium chloride (TEA).
Identified four distinct K+ channel classes by unit conductances (27, 44, 70, and 100 pS) that diverge in voltage dependence, mean open time, TEA sensitivity, and developmental timing.
Observed developmental increases in Purkinje neuron spontaneous firing rates, spike waveform diversity, and sensitivity to TEA-mediated disruption.
Demonstrated that heightened sensitivity to TEA during physiological maturation directly correlates with the developmental emergence of the larger-conductance 70 and 100 pS K+ channel subtypes.

Structured PICO

Population

In vitro study of cerebellar Purkinje neurons cultured from 20-day rat embryos, followed for up to 29 days in vitro to assess developmental changes in K+ channels.

Exposure

In vitro development (5 to 29 days in vitro) and pharmacological testing with tetraethylammonium chloride (TEA)

Outcome

Characterization of K+-selective channels (conductance, voltage dependence, TEA sensitivity, mean open time) and spontaneous activity patternssurrogate

Developmental regulation of K+-selective channel activity contributes significantly to the ionic mechanisms underlying developmental transitions in spontaneous activity patterns in cerebellar Purkinje neurons.

Limitations

In vitro culture conditions lack input from the inferior olivary nucleus
Analyses from multiple-channel patches may underestimate mean open duration

Cite This Study

Yool et al. (1988) studied Neuronal development. Developmental maturation (days in vitro) vs. Immature neurons (early days in vitro) was evaluated on Types and properties of active K+-selective channels. Maturation of cultured Purkinje neurons involves the progressive expression of larger-conductance (70 and 100 pS) K+ channels, which increases sensitivity to TEA and alters spontaneous firing patterns.

synapsesocial.com/papers/6a9de7260802d747abf6c58d https://doi.org/10.1523/jneurosci.08-06-01971.1988

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Developmental changes in K+-selective channel activity during differentiation of the Purkinje neuron in culture

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Developmental changes in K+-selective channel activity during differentiation of the Purkinje neuron in culture

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Also Consider

Also Consider