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Observing and Manipulating Cell-Specific Cardiac Function with Light

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Optogenetics

Abstract

The heart is a complex multicellular organ comprising both cardiomyocytes (CM), which make up the majority of the cardiac volume, and non-myocytes (NM), which represent the majority of cardiac cells. CM drive the pumping action of the heart, triggered via rhythmic electrical activity. NM, on the other hand, have many essential functions including generating extracellular matrix, regulating CM activity, and aiding in repair following injury. NM include neurons and interstitial, immune, and endothelial cells. Understanding the role of specific cell types and their interactions with one another may be key to developing new therapies with minimal side effects to treat cardiac disease. However, assessing cell-type-specific behavior in situ using standard techniques is challenging. Optogenetics enables population-specific observation and control, facilitating studies into the role of specific cell types and subtypes. Optogenetic models targeting the most important cardiac cell types have been generated and used to investigate non-canonical roles of those cell populations, e.g., to better understand how cardiac pacing occurs and to assess potential translational possibilities of optogenetics. So far, cardiac optogenetic studies have primarily focused on validating models and tools in the healthy heart. The field is now in a position where animal models and tools should be utilized to improve our understanding of the complex heterocellular nature of the heart, how this changes in disease, and from there to enable the development of cell-specific therapies and improved treatments.

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Abbreviations

AAV:

Adeno-associated viral [particles]

ACR:

Anion channelrhodopsins

AV:

Atrioventricular

ChR2:

Chlamyodomonas reinhardtii channelrhodopsin-2

CM:

Cardiomyocytes

ECG:

Electrocardiogram

ICNS:

Intrinsic cardiac nervous system

NM:

Non-myocytes

NpHR:

Natromonas pharaonis halorhodopsin

PN:

Parasympathetic neurons

RA:

Right atrial

SN:

Sympathetic neurons

VSFP:

Voltage-sensitive fluorescent protein

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Acknowledgments

We thank all members of the Institute of Experimental Cardiovascular Medicine for critical discussion of the manuscript. This research was funded by the German Research Foundation DFG (SPP1926: FS1486/1-2, ZG58/1-1, and an Emmy-Noether-Fellowship: FS1486/2-1). Both authors are members of the DFG-funded Collaborative Research Centre 1425.

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Correspondence to Franziska Schneider-Warme .

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Zgierski-Johnston, C.M., Schneider-Warme, F. (2021). Observing and Manipulating Cell-Specific Cardiac Function with Light. In: Yawo, H., Kandori, H., Koizumi, A., Kageyama, R. (eds) Optogenetics. Advances in Experimental Medicine and Biology, vol 1293. Springer, Singapore. https://doi.org/10.1007/978-981-15-8763-4_24

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