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Updated: May 13, 2026
Isolation of Cardiomyocyte Nuclei from Post-mortem Tissue
Published on: July 10, 2012
Intronic RNAscope probes enable precise identification of cardiomyocyte nuclei and cell cycle activity
Zhe Yu1, Sen Zhang2, Julius Bogomolovas3
1Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, 92093, USA.
Abstract:
Cardiac regeneration studies have been plagued by technical challenges in unequivocally identifying cardiomyocyte (CM) nuclei in cardiac sections, crucial for accurate identification of cycling CMs. The use of antibodies to sarcomeric proteins is error-prone, the CM specificity of common nuclear markers is controversial, and utilizing genetically modified mouse models poses risk of inducing unintended cardiac phenotypes. The application of RNAscope intronic probes overcomes the above shortcomings. Intronic probes label intronic RNAs within nuclei and can therefore be utilized as a method for nuclear localization. A Tnnt2 intronic RNAscope probe highly colocalized with Obscurin-H2B-GFP in adult mouse hearts, demonstrating CM specificity. Studies in embryos demonstrated that the Tnnt2 intronic RNAscope probe labeled CM nuclei that had undergone DNA replication, and remained closely associated with CM chromatin at all stages of mitosis, even with nuclear envelope breakdown. The efficiency, accuracy, and perdurance of the Tnnt2 intronic RNAscope probe even with nuclear envelope breakdown facilitated reliable investigation of dynamics of DNA synthesis and potential mitoses in CMs in both border and infarct zones after myocardial infarction (MI). Furthermore, we designed Myl2 and Myl4 intronic RNAscope probes, which labeled ventricular and atrial CM nuclei, respectively, and may help identify CM subtypes generated in vitro.
Insights
New RNAscope intronic probes accurately identify cardiomyocyte nuclei, overcoming previous technical challenges. This breakthrough enables precise tracking of cardiomyocyte cell division and subtypes, advancing cardiac regeneration research.
Area of Science:
- Cardiovascular Biology
- Molecular Biology
- Regenerative Medicine
Background:
- Accurate identification of cardiomyocyte nuclei is critical for studying cardiac regeneration.
- Existing methods like antibodies and genetic models have limitations in specificity and safety.
- Novel nuclear markers are needed to overcome these challenges.
Purpose of the Study:
- To develop and validate a novel method for unequivocally identifying cardiomyocyte nuclei.
- To assess the utility of this method in studying cardiomyocyte cell cycle dynamics after myocardial infarction.
- To explore the potential of subtype-specific probes for cardiomyocyte identification.
Main Methods:
- Application of RNAscope intronic probes targeting cardiomyocyte-specific genes (Tnnt2, Myl2, Myl4).
- Validation of probe specificity using Obscurin-H2B-GFP reporter mice.
- Assessment of probe performance in embryonic and adult mouse hearts, including post-myocardial infarction models.
Main Results:
- A Tnnt2 intronic RNAscope probe demonstrated high specificity for cardiomyocyte nuclei.
- The probe accurately labeled replicating cardiomyocyte nuclei and tracked them through mitosis, even with nuclear envelope breakdown.
- Myl2 and Myl4 intronic probes distinguished ventricular and atrial cardiomyocyte nuclei, respectively.
Conclusions:
- RNAscope intronic probes offer an efficient and accurate method for cardiomyocyte nuclear identification.
- This technique facilitates reliable investigation of cardiomyocyte proliferation and dynamics after cardiac injury.
- Intronic probes hold promise for identifying cardiomyocyte subtypes in vitro and in vivo.
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