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| 100 | 1 | _ | |a Sridhar, Krishna |0 P:(DE-Juel1)172046 |b 0 |
| 245 | _ | _ | |a Calcium mediated functional interplay between myocardial cells upon laser-induced single-cell injury: an in vitro study of cardiac cell death signaling mechanisms |
| 260 | _ | _ | |a London |c 2020 |b Biomed Central |
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| 520 | _ | _ | |a BackgroundThe electromechanical function of myocardial tissue depends on the intercellular communication between cardiomyocytes (CMs) as well as their crosstalk with other cell types. Cell injury, and subsequent death trigger inflammation as in myocardial infarction (MI) resulting in myocardial remodeling. Although mechanisms underlying myocardial cell death have been studied so far, the signaling events following single cell death and spontaneous response of connected cells in the myocardial tissue is still barely understood.MethodsHere, we investigated the effect of laser-induced single cell death on Calcium (Ca2+) concentrations and transport in myocardial cell clusters in vitro. Spatial and temporal changes in intracellular Ca2+ concentrations [Ca2+]i were studied using a fluorescent calcium indicator, Fluo-4AM. Spontaneous signaling events following cell death were studied in rat embryonic cardiomyocytes and non-myocytes using separate cell culture systems.ResultsCell death triggered spontaneous increase in intracellular Ca2+ levels ([Ca2+]i) of surrounding cells. The spread of the observed propagating Ca2+ signal was slow and sustained in myocytes while it was rapid and transient in fibroblasts (Fbs). Further, sustained high Ca2+ levels temporarily impaired the contractility in CMs. The cell-type specific effect of ablation was confirmed using separate cultures of CMs and Fbs. Comparing Ca2+ propagation speed in myocytes and fibroblasts, we argue for a diffusion-driven Ca2+ propagation in myocytes, but not in fibroblasts. Radial and sequential Ca2+ diffusion across the CMs through cell–cell contacts and presence of Cx43-based intercellular junctions indicated a gap junction flow of Ca2+.ConclusionsThese findings illustrate the spontaneous Ca2+-mediated functional interplay in myocardial cell clusters upon mechanical injury and, further, the difference in Ca2+ signaling in cardiomyocytes and fibroblasts. |
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| 700 | 1 | _ | |a Hoffmann, Bernd |0 P:(DE-Juel1)128817 |b 4 |e Corresponding author |
| 773 | _ | _ | |a 10.1186/s12964-020-00689-5 |g Vol. 18, no. 1, p. 191 |0 PERI:(DE-600)2126315-2 |n 1 |p 191 |t Cell communication and signaling |v 18 |y 2020 |x 1478-811X |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/889889/files/SN-2020-00398-b.pdf |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/889889/files/s12964-020-00689-5.pdf |y OpenAccess |
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