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Updated: Jul 5, 2026
Harmonic Nanoparticles for Regenerative Research
Published on: May 1, 2014
Application of Digital Holographic Imaging to Monitor Real-Time Cardiomyocyte Hypertrophy Dynamics in Response to
Wahida Akter1, Herman Huang1, Jacquelyn Simmons1
1Department of Biological Sciences, San Jose State University, San Jose, CA 95192, USA.
Insights
Digital holographic imaging tracked dynamic changes in cardiomyocyte size during hypertrophy. This non-invasive method offers enhanced temporal resolution for studying cardiac cell growth mechanisms.
Area of Science:
- Cardiovascular biology
- Cellular imaging
- Biophysics
Background:
- Cardiomyocyte hypertrophy, an increase in cell size, is linked to cardiovascular diseases like hypertension and myocardial infarction.
- Current in vitro models offer limited insight into the dynamic nature of hypertrophic responses.
- Understanding cardiomyocyte growth dynamics is crucial for developing effective cardiovascular disease treatments.
Purpose of the Study:
- To evaluate the Holomonitor M4 digital holographic imaging microscope for tracking dynamic changes in cardiomyocyte surface area and volume.
- To assess the potential of this technology for long-term, label-free imaging of hypertrophic responses.
- To explore cardiomyocyte hypertrophic responses with enhanced temporal resolution.
Main Methods:
- Primary neonatal rat cardiomyocytes were cultured and treated with norepinephrine, a known hypertrophic stimulus.
- Live imaging was performed using the Holomonitor M4, enabling non-invasive, label-free 3D morphological analysis.
- Image segmentation and single-cell tracking were conducted using HOLOMONITOR App Suite software.
Main Results:
- Norepinephrine treatment increased cardiomyocyte spreading and optical volume, confirming the model's validity.
- Single-cell tracking revealed dynamic, time-dependent increases in cardiomyocyte surface area and 3D optical volume over 24 hours.
- The Holomonitor M4 demonstrated potential for high-temporal-resolution studies of cardiomyocyte hypertrophy, despite some observed limitations.
Conclusions:
- The Holomonitor M4 system provides a powerful tool for non-invasive, label-free, long-term monitoring of cardiomyocyte hypertrophy dynamics.
- This technology enables a deeper understanding of the temporal aspects of cardiac cell growth.
- Future research can leverage this system to elucidate molecular and cellular mechanisms underlying cardiovascular diseases with enhanced clarity.
Abstract:
Cardiomyocyte hypertrophy, characterized by an increase in cell size, is associated with various cardiovascular diseases driven by factors including hypertension, myocardial infarction, and valve dysfunction. In vitro primary cardiomyocyte culture models have yielded numerous insights into the intrinsic and extrinsic mechanisms driving hypertrophic growth. However, due to limitations in current approaches, the dynamics of cardiomyocyte hypertrophic responses remain poorly characterized. In this study, we evaluate the application of the Holomonitor M4 digital holographic imaging microscope to track dynamic changes in cardiomyocyte surface area and volume in response to norepinephrine treatment, a model hypertrophic stimulus. The Holomonitor M4 permits non-invasive, label-free imaging of three-dimensional changes in cell morphology with minimal phototoxicity, thus enabling long-term imaging studies. Untreated and norepinephrine-stimulated primary neonatal rat cardiomyocytes were live-imaged on the Holomonitor M4, which was followed by image segmentation and single-cell tracking using the HOLOMONITOR App Suite software version 4.0.1.546. The 24 h treatment of cultured cardiomyocytes with norepinephrine increased cardiomyocyte spreading and optical volume as expected, validating the reliability of the approach. Single-cell tracking of both cardiomyocyte surface area and three-dimensional optical volume revealed dynamic increases in these parameters throughout the 24 h imaging period, demonstrating the potential of this technology to explore cardiomyocyte hypertrophic responses with greater temporal resolution; however, technological limitations were also observed and should be considered in the experimental design and interpretation of results. Overall, leveraging the unique advantages of the Holomonitor M4 digital holographic imaging system has the potential to empower future work towards understanding the molecular and cellular mechanisms underlying cardiomyocyte hypertrophy with enhanced temporal clarity.
