What is the clinical evidence from this study?

Study design: Other. Population: Hyperlipidemia-induced cardiac arrhythmias (n=36). Intervention: KN93 vs. Vehicle (High-fat diet alone or standard chow). Primary outcome: Arrhythmia inducibility and cardiac electrical remodeling (APD90, conduction velocity) (p=<0.05).

What question did this study set out to answer?

This study aims to assess the role of CaMKII in cardiac arrhythmias related to obesity and hyperlipidemia.

June 28, 2017Journal of Cardiovascular PharmacologyOpen Access

CaMKII Activation Promotes Cardiac Electrical Remodeling and Increases the Susceptibility to Arrhythmia Induction in High-fat Diet–Fed Mice With Hyperlipidemia Conditions

Q: What are the key findings of this study?

In high-fat diet-fed mice, CaMKII inhibition with KN93 significantly attenuated hyperlipidemia-induced cardiac electrical remodeling and reduced susceptibility to atrial and ventricular arrhythmias.

Q: What question did this study set out to answer?

This study aims to assess the role of CaMKII in cardiac arrhythmias related to obesity and hyperlipidemia.

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Key result

In high-fat diet-fed mice, CaMKII inhibition with KN93 significantly attenuated hyperlipidemia-induced cardiac electrical remodeling and reduced susceptibility to atrial and ventricular arrhythmias.

Why the study?

Does CaMKII inhibition with KN93 improve cardiac electrical remodeling and reduce arrhythmia susceptibility in high-fat diet-fed APOE-/- mice?

Population

36 adult male APOE-/- mice on a C57BL/6 background, weighting 18-22 g, fed a high-fat diet to induce…

Comparison

KN93 10 mg/kg/2d by peritoneal injection for 8… vs Vehicle only in HFD-fed mice and standard…

Design

Preclinical, All the electrophysiological studies were performed and analyzed…

Follow-up

16 weeks (8 weeks HFD followed by 8 weeks HFD + treatment)

Authors

PZPeng ZhongArmy Medical University DQDajun QuanBrigham and Women's Hospital YHYan HuangQilu Hospital of Shandong University

Discussion

Member takes

Implication

CaMKII inhibition merits exploration in hyperlipidemia arrhythmias; hypothesis-generating in mice, requiring clinical confirmation.

Key Points

This study aims to assess the role of CaMKII in cardiac arrhythmias related to obesity and hyperlipidemia.
Adult male APOE mice were fed a high-fat diet (HFD) and treated with KN93, a CaMKII inhibitor.
Cardiac function, serum lipid profiles, and electrophysiological properties were analyzed, including surface ECG and activation mapping.
Histological analysis evaluated ion channels, gap junction proteins, and CaMKII expression.
HFD-induced hearts exhibited increased arrhythmia inducibility and prolonged action potential duration.
KN93 treatment significantly inhibited the adverse effects seen with HFD, including downregulation of ion channels and fibrosis.

Structured PICO

Does CaMKII inhibition with KN93 improve cardiac electrical remodeling and reduce arrhythmia susceptibility in high-fat diet-fed APOE-/- mice?

Population

36 adult male APOE -/- mice fed a high-fat diet for 8 weeks to evaluate the role of CaMKII in hyperlipidemia-induced cardiac arrhythmias.

Intervention

KN93 (CaMKII inhibitor) 10 mg/kg/2d by peritoneal injection for 8 weeks after an initial 8 weeks of HFD.

Comparator

Vehicle only (gavaged) in HFD-fed mice and standard chow-fed control mice.

Outcome

Cardiac electrophysiology (arrhythmia inducibility, action potential duration, conduction velocity) and expression of cardiac ion channels, gap junction proteins, and Ca2+ handling proteins.surrogate

Main Result

p-value: p=<0.05

CaMKII inhibition with KN93 attenuates cardiac electrical remodeling and reduces arrhythmia susceptibility in a hyperlipidemic mouse model, suggesting CaMKII as a potential therapeutic target for obesity-related arrhythmias.

Limitations

KN93 has potential off-target effects, including inhibition of voltage-dependent K+ currents and L-type calcium channels.
Ex vivo arrhythmia induction may have limited relevance to spontaneous in vivo cardiac arrhythmias.
Metabolic improvements from KN93 may be secondary to liver CaMKII inhibition rather than a direct cardiac effect.
KN93 improved metabolic parameters, so in vivo cardiac effects might be secondary to drug action on the liver.
KN93 has known off-target effects on voltage-dependent K+ currents and L-type calcium channel activity.
Arrhythmogenic effect evaluated through ex vivo induction is tenuous and probably of little relevance to real clinical cardiac arrhythmias.

Cite This Study

Zhong et al. (2017) studied Hyperlipidemia-induced cardiac arrhythmias (n=36). KN93 vs. Vehicle (High-fat diet alone or standard chow) was evaluated on Arrhythmia inducibility and cardiac electrical remodeling (APD90, conduction velocity) (p=<0.05). In high-fat diet-fed mice, CaMKII inhibition with KN93 significantly attenuated hyperlipidemia-induced cardiac electrical remodeling and reduced susceptibility to atrial and ventricular arrhythmias.

synapsesocial.com/papers/6a39ce0bc5135fa86afa1f1a https://doi.org/10.1097/fjc.0000000000000512

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