Increased circulating progranulin is not sufficient to induce cardiac dysfunction or supraventricular arrhythmia

Area of Science:

• Cardiology
• Biochemistry
• Molecular Biology

Background:

• Atrial fibrillation (AF) is a common heart arrhythmia with increasing incidence.
• Obesity is a growing public health concern and a risk factor for AF.
• The role of circulating proteins, like progranulin, in obesity-related AF is under investigation.

Purpose of the Study:

• To investigate the impact of elevated circulating progranulin levels on supraventricular arrhythmias.
• To assess the effects of increased progranulin on cardiac structure and function.

Main Methods:

• Adeno-associated virus serotype 8 (AAV8)-mediated overexpression of mouse progranulin in C57Bl/6N mice.
• Sustained high plasma progranulin levels for 20 weeks.
• Cardiac electrophysiology assessed via surface ECG with isoproterenol challenge.
• Cardiac structure and function evaluated using echocardiography.

Main Results:

• Sustained elevation of circulating progranulin levels was confirmed.
• No significant changes in cardiac structure or function were observed.
• Electrocardiogram (ECG) parameters remained unaffected.
• No supraventricular arrhythmias or proarrhythmic events were induced by isoproterenol challenge.

Conclusions:

• In this mouse model, elevated circulating progranulin alone is insufficient to induce cardiac structural or functional changes.
• Increased progranulin levels did not lead to ECG abnormalities or increased susceptibility to supraventricular arrhythmias.
• Further research is needed to elucidate the complex relationship between obesity, progranulin, and atrial fibrillation.