What does this research mean for the field?

IGF-1 accelerates cardiac pacemaking and increases cell surface expression of HCN4 pacemaker channels by promoting Rab11-dependent endosomal recycling. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine the molecular mechanism through which insulin-like growth factor 1 (IGF-1) influences cardiac pacemaking and promotes tachycardia.

November 1, 2025Journal of Molecular and Cellular CardiologyOpen Access

IGF-1 promotes cell surface expression of HCN4 pacemaker channels contributing to tachycardia

Q: What is the clinical evidence from this study?

Population: Tachycardia. Intervention: IGF-1. Primary outcome: Cardiac pacemaking rate and cell surface expression of HCN4 channels.

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Key result

IGF-1 accelerates cardiac pacemaking by increasing cell surface HCN4 expression via Rab11-dependent recycling.

Why the study?

Clinical studies evaluate systemic IGF-1 in conditions such as heart failure, but tachycardia is commonly reported as a side effect.

Key Points

To determine the molecular mechanism through which insulin-like growth factor 1 (IGF-1) influences cardiac pacemaking and promotes tachycardia.
Ex vivo optical voltage mapping in mouse sinoatrial node preparations to evaluate cardiac pacemaking rates.
Heterologous reconstitution experiments using Xenopus laevis oocytes with extracellular epitope tagging and electrophysiology to track HCN4 trafficking.
IGF-1 directly accelerated cardiac pacemaking in isolated mouse sinoatrial node preparations.
IGF-1 enhanced the cell surface expression of HCN4 pacemaker channels by driving Rab11-dependent endosomal recycling.

PICO

Population

Tachycardia

Intervention / Comparator

IGF-1

Primary Outcome

Cardiac pacemaking rate and cell surface expression of HCN4 channels

Discussion

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Implication

Tachycardia risk with IGF-1 therapy warrants monitoring in trials; leaves open translation from ex vivo pacemaking effects.

Cite This Study

Erlenhardt et al. (2025) studied Tachycardia. IGF-1 was evaluated on Cardiac pacemaking rate and cell surface expression of HCN4 channels. IGF-1 accelerates cardiac pacemaking and increases cell surface expression of the HCN4 pacemaker channel by stimulating Rab11-dependent endosomal recycling.

synapsesocial.com/papers/6a8671e7e3ff5bf5642ed37a https://doi.org/10.1016/j.yjmcc.2025.10.015

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IGF-1 promotes cell surface expression of HCN4 pacemaker channels contributing to tachycardia

Key Points

PICO

Discussion

Implication

Cite This Study

IGF-1 promotes cell surface expression of HCN4 pacemaker channels contributing to tachycardia

Key Points

PICO

Discussion

Implication

Cite This Study

Also Consider

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