What question did this study set out to answer?

To determine whether the hyperdynamic contractile phenotype observed after phospholamban ablation is caused solely by phospholamban deficiency or involves secondary compensatory mechanisms.

December 1, 1996Circulation Research

Compensatory Mechanisms Associated With the Hyperdynamic Function of Phospholamban-Deficient Mouse Hearts

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Population

Phospholamban-deficient and age-matched wild-type mice

Comparison

Phospholamban ablation vs Age-matched wild-type mice

Design

Preclinical

Authors

GCGuoxiang ChuShandong University of Science and Technology WLWusheng LuoBrigham and Women's Hospital JSJay P. SlackGivaudan (Switzerland)

Discussion

Member takes

Implication

These mouse data are hypothesis-generating for phospholamban-targeted therapies; clinical relevance remains to be determined.

Key Points

To determine whether the hyperdynamic contractile phenotype observed after phospholamban ablation is caused solely by phospholamban deficiency or involves secondary compensatory mechanisms.
Characterized cardiac morphology, contractile protein expression, and junctional sarcoplasmic reticulum calcium content in phospholamban-deficient and age-matched wild-type mice.
Evaluated myocardial energetics and substrate metabolism via oxygen consumption measurements, mitochondrial pyruvate dehydrogenase activation assays, and phosphorus-31 nuclear magnetic resonance.
Phospholamban ablation reduced ryanodine receptor protein levels by 25% alongside an increase in junctional sarcoplasmic reticulum diastolic calcium content (16.0 ± 2.2 vs. 8.6 ± 1.0 mmol Ca²⁺/kg dry weight).
Myocardial oxygen consumption increased 1.6-fold and active pyruvate dehydrogenase increased 2.2-fold to preserve ATP levels despite lower phosphocreatine and elevated ADP and AMP levels.

Structured PICO

Population

Phospholamban-deficient and age-matched wild-type mice

Intervention

Phospholamban ablation

Comparator

Age-matched wild-type mice

Outcome

Morphological alterations, protein levels, Ca2+ content, ATP levels, oxygen consumption, and metabolic adaptationssurrogate

Phospholamban ablation in mice induces compensatory downregulation of ryanodine receptors and metabolic adaptations to manage increased sarcoplasmic reticulum calcium load and ATP demand.

Cite This Study

Chu et al. (1996) studied this question.

synapsesocial.com/papers/6a0e9ece25c30b2cc7f99df2 https://doi.org/10.1161/01.res.79.6.1064

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Compensatory Mechanisms Associated With the Hyperdynamic Function of Phospholamban-Deficient Mouse Hearts

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Compensatory Mechanisms Associated With the Hyperdynamic Function of Phospholamban-Deficient Mouse Hearts

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Also Consider