TY  - JOUR
A1  - Goßmann, Matthias
A1  - Frotscher, Ralf
A1  - Linder, Peter
A1  - Bayer, Robin
A1  - Epple, U.
A1  - Staat, Manfred
A1  - Temiz Artmann, Aysegül
A1  - Artmann, Gerhard
T1  - Mechano-pharmacological characterization of cardiomyocytes derived from human induced pluripotent stem cells
JF  - Cellular physiology and biochemistry
N2  - Background/Aims: Common systems for the quantification of cellular contraction rely on animal-based models, complex experimental setups or indirect approaches. The herein presented CellDrum technology for testing mechanical tension of cellular monolayers and thin tissue constructs has the potential to scale-up mechanical testing towards medium-throughput analyses. Using hiPS-Cardiac Myocytes (hiPS-CMs) it represents a new perspective of drug testing and brings us closer to personalized drug medication. Methods: In the present study, monolayers of self-beating hiPS-CMs were grown on ultra-thin circular silicone membranes and deflect under the weight of the culture medium. Rhythmic contractions of the hiPS-CMs induced variations of the membrane deflection. The recorded contraction-relaxation-cycles were analyzed with respect to their amplitudes, durations, time integrals and frequencies. Besides unstimulated force and tensile stress, we investigated the effects of agonists and antagonists acting on Ca²⁺ channels (S-Bay K8644/verapamil) and Na⁺ channels (veratridine/lidocaine). Results: The measured data and simulations for pharmacologically unstimulated contraction resembled findings in native human heart tissue, while the pharmacological dose-response curves were highly accurate and consistent with reference data. Conclusion: We conclude that the combination of the CellDrum with hiPS-CMs offers a fast, facile and precise system for pharmacological, toxicological studies and offers new preclinical basic research potential.
KW  - Inotropic compounds
KW  - Pharmacology
KW  - Ion channels
KW  - CellDrum
KW  - Heart tissue culture
KW  - Induced pluripotent stem cells
KW  - Cardiac myocytes
Y1  - 2016
U6  - http://dx.doi.org/10.1159/000443124
SN  - 1421-9778 (Online)
SN  - 1015-8987 (Print)
VL  - 38
IS  - 3
SP  - 1182
EP  - 1198
PB  - Karger
CY  - Basel
ER  - 
TY  - JOUR
A1  - Frotscher, Ralf
A1  - Muanghong, Danita
A1  - Dursun, Gözde
A1  - Goßmann, Matthias
A1  - Temiz Artmann, Aysegül
A1  - Staat, Manfred
T1  - Sample-specific adaption of an improved electro-mechanical model of in vitro cardiac tissue
JF  - Journal of Biomechanics
N2  - We present an electromechanically coupled computational model for the investigation of a thin cardiac tissue construct consisting of human-induced pluripotent stem cell-derived atrial, ventricular and sinoatrial cardiomyocytes. The mechanical and electrophysiological parts of the finite element model, as well as their coupling are explained in detail. The model is implemented in the open source finite element code Code_Aster and is employed for the simulation of a thin circular membrane deflected by a monolayer of autonomously beating, circular, thin cardiac tissue. Two cardio-active drugs, S-Bay K8644 and veratridine, are applied in experiments and simulations and are investigated with respect to their chronotropic effects on the tissue. These results demonstrate the potential of coupled micro- and macroscopic electromechanical models of cardiac tissue to be adapted to experimental results at the cellular level. Further model improvements are discussed taking into account experimentally measurable quantities that can easily be extracted from the obtained experimental results. The goal is to estimate the potential to adapt the presented model to sample specific cell cultures.
KW  - hiPS cardiomyocytes
KW  - Homogenization
KW  - Hodgkin–Huxley models
KW  - Frequency adaption
KW  - Electromechanical modeling
KW  - Drug simulation
KW  - Computational biomechanics
KW  - Cardiac tissue
Y1  - 2016
U6  - http://dx.doi.org/10.1016/j.jbiomech.2016.01.039
SN  - 0021-9290 (Print)
SN  - 1873-2380 (Online)
VL  - 49
IS  - 12
SP  - 2428
EP  - 2435
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Niedermeyer, Angela
A1  - Zhou, Bei
A1  - Dursun, Gözde
A1  - Temiz Artmann, Aysegül
A1  - Markert, Bernd
T1  - An examination of tissue engineered scaffolds in a bioreactor
JF  - Proceedings in Applied Mathematics and Mechanics PAMM
N2  - Replacement tissues, designed to fill in articular cartilage defects, should exhibit the same properties as the native material. The aim of this study is to foster the understanding of, firstly, the mechanical behavior of the material itself and, secondly, the influence of cultivation parameters on cell seeded implants as well as on cell migration into acellular implants. In this study, acellular cartilage replacement material is theoretically, numerically and experimentally investigated regarding its viscoelastic properties, where a phenomenological model for practical applications is developed. Furthermore, remodeling and cell migration are investigated.
Y1  - 2016
U6  - http://dx.doi.org/10.1002/pamm.201610038
SN  - 1617-7061
N1  - Joint Annual Meeting of DMV and GAMM 2016, 87th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) and Deutsche Mathematiker-Vereinigung (DMV), Braunschweig, DE, Mar 7-11, 2016
VL  - 16
IS  - 1
SP  - 99
EP  - 100
PB  - Wiley-VCH
CY  - Weinheim
ER  -