What is the clinical evidence from this study?

Study design: Other. Population: Early-stage myocardial infarction. Intervention: NEAT1 silencing vs. Control/wild-type. Primary outcome: CACNA1C and PDLIM5 expression and intracellular calcium levels.

What does this research mean for the field?

Elevated NEAT1 drives ion channel remodeling in a distinct subpopulation of cardiomyocytes within the early myocardial infarction border zone by modulating CACNA1C and PDLIM5 through a microRNA-mediated network, contributing to a potentially arrhythmogenic state. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To identify cell-type-specific cardiomyocyte subpopulations and elucidate the NEAT1-centered molecular regulatory network driving ion channel remodeling and ventricular arrhythmogenesis in early myocardial infarction.

September 8, 2026International Journal of Molecular SciencesOpen Access

NEAT1 Coordinates a PDLIM5–CACNA1C Regulatory Program Associated with a Potentially Arrhythmogenic Cardiomyocyte State in the Border Zone During Early Myocardial Infarction

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Key result

NEAT1 silencing attenuates hypoxia-induced intracellular calcium overload by downregulating CACNA1C and PDLIM5 in cardiomyocytes.

Why the study?

Patients with early-stage MI face high risks of malignant ventricular arrhythmias, but the cell-type-specific molecular landscape associated with post-infarction arrhythmogenesis has not been systematically characterized.

Population

Post-MI human hearts and hypoxic rat cardiomyocytes

Comparison

siRNA-mediated NEAT1 knockdown vs control

Design

Single-nucleus and spatial transcriptomic re-analysis with in vitro experimental validation

Authors

JZJiuxiao ZhaoCentral South University QZQian ZhuChinese Academy of Sciences YLYang LouSir Run Run Shaw Hospital

Discussion

Member takes

Implication

May support NEAT1 as a target to limit calcium overload in ischemic cardiomyocytes; leaves open clinical translation for arrhythmia prevention.

Key Points

To identify cell-type-specific cardiomyocyte subpopulations and elucidate the NEAT1-centered molecular regulatory network driving ion channel remodeling and ventricular arrhythmogenesis in early myocardial infarction.
Re-analyzed human post-MI single-nucleus and spatial transcriptomic data stratified into early-stage (≤5 days post-infarction) and late-stage (>5 days) cohorts.
Conducted pseudotime trajectory mapping, high-dimensional weighted gene co-expression network analysis (hdWGCNA), and in silico perturbation predictions (scTenifoldNet and GeneKI).
Assessed gene expression under hypoxia and verified regulatory interactions using siRNA-mediated NEAT1 silencing in neonatal rat ventricular myocytes.
Identified arrhythmia-potential cardiomyocytes (aCMs) enriched in the early-infarct border zone, characterized by distinct developmental trajectory divergence and upregulated ion channel genes including CACNA1C, KCNQ1, and SCN5A.
Demonstrated that NEAT1 co-expressed with CACNA1C and PDLIM5 in module 5, with in silico NEAT1 depletion predicting strong perturbation of CACNA1C (KL divergence = 0.027) and PDLIM5 (KL divergence = 0.017).
Confirmed that hypoxia upregulates Neat1, Pdlim5, and Cacna1c, whereas siRNA knockdown of NEAT1 significantly downregulates CACNA1C and PDLIM5 mRNA and protein expression.

Structured PICO

Population

Preclinical study integrating single-nucleus transcriptomics of human post-myocardial infarction hearts with in vitro rat and human cardiomyocyte models to investigate NEAT1-mediated ion channel remodeling.

Intervention

siRNA-mediated knockdown of NEAT1

Comparator

Control/wild-type cells under normoxic or hypoxic conditions

Outcome

Expression levels of CACNA1C and PDLIM5, and intracellular calcium levels (Fluo-4 fluorescence)surrogate

Targeting the NEAT1 regulatory network may offer a novel therapeutic approach to prevent malignant ventricular arrhythmias in the early phase of myocardial infarction.

Limitations

Not all co-expression modules identified by hdWGCNA were subjected to in-depth investigation
The aCM phenotype was defined primarily on the basis of transcriptomic data and has not been validated electrophysiologically
Functional studies focused primarily on the calcium channel gene CACNA1C, whereas the potassium channel gene KCNQ1 was not experimentally pursued
Validation in NRVMs and AC16 cells may not fully recapitulate the adult ischemic context
Direct evidence from an in vivo arrhythmia model demonstrating the therapeutic efficacy of NEAT1 inhibition is still lacking

Cite This Study

Zhao et al. (2026) studied Early-stage myocardial infarction. NEAT1 silencing vs. Control/wild-type was evaluated on CACNA1C and PDLIM5 expression and intracellular calcium levels. NEAT1 silencing significantly downregulated CACNA1C and PDLIM5 expression and attenuated hypoxia-induced elevation in intracellular calcium levels in cardiomyocytes.

synapsesocial.com/papers/6a9fd83b58e84d0ff5b47907 https://doi.org/10.3390/ijms27177945

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Implication

May support NEAT1 as a target to limit calcium overload in ischemic cardiomyocytes; leaves open clinical translation for arrhythmia prevention.

NEAT1 Coordinates a PDLIM5–CACNA1C Regulatory Program Associated with a Potentially Arrhythmogenic Cardiomyocyte State in the Border Zone During Early Myocardial Infarction

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

NEAT1 Coordinates a PDLIM5–CACNA1C Regulatory Program Associated with a Potentially Arrhythmogenic Cardiomyocyte State in the Border Zone During Early Myocardial Infarction

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

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