Related Experiment Video
Updated: Oct 9, 2025
A Cardiac Microphysiological System for Studying Ca2+ Propagation via Non-genetic Optical Stimulation
Published on: March 21, 2025
Deciphering Molecular Mechanisms and Intervening in Physiological and Pathophysiological Processes of Ca2+ Signaling
Lena Maltan1, Hadil Najjar1, Adéla Tiffner1
1Institute of Biophysics, JKU Life Science Center, Johannes Kepler University Linz, A-4020 Linz, Austria.
Abstract:
Calcium ion channels are involved in numerous biological functions such as lymphocyte activation, muscle contraction, neurotransmission, excitation, hormone secretion, gene expression, cell migration, memory, and aging. Therefore, their dysfunction can lead to a wide range of cellular abnormalities and, subsequently, to diseases. To date various conventional techniques have provided valuable insights into the roles of Ca2+ signaling. However, their limited spatiotemporal resolution and lack of reversibility pose significant obstacles in the detailed understanding of the structure-function relationship of ion channels. These drawbacks could be partially overcome by the use of optogenetics, which allows for the remote and well-defined manipulation of Ca2+-signaling. Here, we review the various optogenetic tools that have been used to achieve precise control over different Ca2+-permeable ion channels and receptors and associated downstream signaling cascades. We highlight the achievements of optogenetics as well as the still-open questions regarding the resolution of ion channel working mechanisms. In addition, we summarize the successes of optogenetics in manipulating many Ca2+-dependent biological processes both in vitro and in vivo. In summary, optogenetics has significantly advanced our understanding of Ca2+ signaling proteins and the used tools provide an essential basis for potential future therapeutic application.
Insights
Optogenetics offers precise control over calcium (Ca2+) signaling pathways, overcoming limitations of traditional methods. This advanced technique enhances understanding of ion channel function and disease mechanisms.
Area of Science:
- Molecular Biology
- Neuroscience
- Biophysics
Background:
- Calcium ion channels are crucial for numerous physiological processes, including cell signaling, muscle contraction, and neurotransmission.
- Dysfunction of calcium channels is linked to various diseases, necessitating better research tools.
- Conventional methods for studying calcium signaling have limitations in spatiotemporal resolution and reversibility.
Purpose of the Study:
- To review optogenetic tools for precise manipulation of calcium-permeable ion channels and receptors.
- To highlight optogenetics' achievements and remaining challenges in understanding ion channel mechanisms.
- To summarize the application of optogenetics in studying calcium-dependent biological processes.
Main Methods:
- Review of optogenetic tools and their application to calcium ion channels.
- Analysis of studies demonstrating remote and defined manipulation of Ca2+ signaling.
- Synthesis of in vitro and in vivo experimental findings.
Main Results:
- Optogenetics provides unprecedented spatiotemporal control over calcium signaling.
- Various optogenetic tools have been successfully developed and applied to diverse calcium channels.
- Optogenetics has significantly advanced the understanding of calcium channel function and related biological processes.
Conclusions:
- Optogenetics offers a powerful approach to overcome limitations of conventional techniques in studying calcium ion channels.
- The reviewed optogenetic tools provide a foundation for future research into ion channel mechanisms.
- Optogenetics holds promise for potential therapeutic applications in diseases related to calcium signaling dysfunction.
