What is the clinical evidence from this study?

Intervention: Electrical stimulation and caffeine application vs. Quiescent cells. Primary outcome: Frequency of spontaneous SR Ca2+ release and its correlation with [Na+]i and Na+-Ca2+ exchange.

What question did this study set out to answer?

This research investigates the factors causing variability in spontaneous calcium release frequency in rat ventricular myocytes. It aims to understand the role of sodium and calcium exchange mechanisms.

May 1, 1996Circulation Research

Variability of Spontaneous Ca ²⁺ Release Between Different Rat Ventricular Myocytes Is Correlated With Na ⁺ -Ca ²⁺ Exchange and [Na ⁺ ] i

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Key result

In isolated rat ventricular myocytes, the variability of spontaneous SR Ca2+ release frequency is positively correlated with intracellular Na+ concentration and the rate of Na+-Ca2+ exchange.

Key Points

This research investigates the factors causing variability in spontaneous calcium release frequency in rat ventricular myocytes. It aims to understand the role of sodium and calcium exchange mechanisms.
Isolated rat ventricular myocytes were studied using fluorescent indicators Indo-1 and SBFI to measure intracellular calcium and sodium levels.
Measurements included the effects of caffeine on calcium content in the sarcoplasmic reticulum and the rate of calcium removal from the cytoplasm.
Electrical stimulation through action potentials or voltage-clamp pulses was applied to assess spontaneous calcium release behavior.
High-frequency spontaneous calcium release (>10.min-1) was associated with increased sarcoplasmic reticulum calcium content.
Cells with a rapid decay rate of intracellular calcium had low oscillation frequencies.
Positive correlation was found between spontaneous sarcoplasmic reticulum calcium release frequency and intracellular sodium concentration.

Structured PICO

Population

Isolated rat ventricular myocytes studied for spontaneous Ca2+ release.

Intervention

Electrical stimulation (action potentials or voltage-clamp pulses) and caffeine (10 mmol/L) application

Outcome

Frequency of spontaneous SR Ca2+ release and its correlation with [Na+]i, SR Ca2+ content, and rate of Ca2+ removalsurrogate

Discussion

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Implication

Variability in spontaneous SR Ca2+ release in rat ventricular myocytes is driven by differences in intracellular Na+ concentration and Na+-Ca2+ exchange.

Cite This Study

Díaz et al. (1996) studied this question. Electrical stimulation and caffeine application vs. Quiescent cells was evaluated on Frequency of spontaneous SR Ca2+ release and its correlation with [Na+]i and Na+-Ca2+ exchange. In isolated rat ventricular myocytes, the variability of spontaneous SR Ca2+ release frequency is positively correlated with intracellular Na+ concentration and the rate of Na+-Ca2+ exchange.

synapsesocial.com/papers/6a63facaccedfd04c9928ebe https://doi.org/10.1161/01.res.78.5.857

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Implication

Variability in spontaneous SR Ca2+ release in rat ventricular myocytes is driven by differences in intracellular Na+ concentration and Na+-Ca2+ exchange.

Variability of Spontaneous Ca ²⁺ Release Between Different Rat Ventricular Myocytes Is Correlated With Na ⁺ -Ca ²⁺ Exchange and [Na ⁺ ] i

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Variability of Spontaneous Ca ²⁺ Release Between Different Rat Ventricular Myocytes Is Correlated With Na ⁺ -Ca ²⁺ Exchange and [Na ⁺ ] i

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider