Publications
Below you can find a list of our published research.
Below you can find a list of our published research.
13 results
Cardiovascular research, Volume 120, Issue 3, 1 1 2024, Pages 249-261 'Trapped re-entry' as source of acute focal atrial arrhythmias. De Coster T, Teplenin AS, Feola I, Bart CI, Ramkisoensing AA, den Ouden BL, Ypey DL, Trines SA, Panfilov AV, Zeppenfeld K, de Vries AAF, Pijnappels DA
Aims: Diseased atria are characterized by functional and structural heterogeneities, adding to abnormal impulse generation and propagation. These heterogeneities are thought to lie at the origin of fractionated electrograms recorded during sinus rhythm (SR) in atrial fibrillation (AF) patients and are assumed to be involved in the onset and perpetuation (e.g. by re-entry) of this disorder. The underlying mechanisms, however, remain incompletely understood. Here, we tested whether regions of dens... Abstract
Cited 3 times since 2023 (3.6 per year) source: EuropePMC
Journal of internal medicine, Volume 294, Issue 3, 21 3 2023, Pages 347-357 Light transmittance in human atrial tissue and transthoracic illumination in rats support translatability of optogenetic cardioversion of atrial fibrillation. Nyns ECA, Portero V, Deng S, Jin T, Harlaar N, Bart CI, van Brakel TJ, Palmen M, Hjortnaes J, Ramkisoensing AA, Zhang GQ, Poelma RH, Ördög B, de Vries AAF, Pijnappels DA
Background: Optogenetics could offer a solution to the current lack of an ambulatory method for the rapid automated cardioversion of atrial fibrillation (AF), but key translational aspects remain to be studied. Objective: To investigate whether optogenetic cardioversion of AF is effective in the aged heart and whether sufficient light penetrates the human atrial wall. Methods: Atria of adult and aged rats were optogenetically modified to express light-gated ion channels (i.e., red-activatable ch... Abstract
Cited 5 times since 2022 (2.8 per year) source: EuropePMC
Cardiovascular research, Volume 118, Issue 10, 1 1 2022, Pages 2293-2303 Optical ventricular cardioversion by local optogenetic targeting and LED implantation in a cardiomyopathic rat model. Nyns ECA, Jin T, Fontes MS, van den Heuvel T, Portero V, Ramsey C, Bart CI, Zeppenfeld K, Schalij MJ, van Brakel TJ, Ramkisoensing AA, Zhang G, Poelma RH, Ördög B, de Vries AAF, Pijnappels DA
Aims: Ventricular tachyarrhythmias (VTs) are common in the pathologically remodelled heart. These arrhythmias can be lethal, necessitating acute treatment like electrical cardioversion to restore normal rhythm. Recently, it has been proposed that cardioversion may also be realized via optically controlled generation of bioelectricity by the arrhythmic heart itself through optogenetics and therefore without the need of traumatizing high-voltage shocks. However, crucial mechanistic and translation... Abstract
Stem cells (Dayton, Ohio), Volume 37, Issue 5, 13 2 2019, Pages E1 Young Versus Adult: Finding Clues to Unravel the Increased Regenerative Ability of Stem Cells from Young Donors. Ramkisoensing AA
Netherlands heart journal : monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation, Volume 22, Issue 11, 1 1 2014, Pages 491-492 Image-guided intramyocardial cell injection: putting a puzzle piece in the right place. Ramkisoensing AA, Atsma DE
Cited 14 times since 2014 (1.4 per year) source: EuropePMC
Cardiovascular research, Volume 102, Issue 2, 27 4 2014, Pages 224-231 Interaction between myofibroblasts and stem cells in the fibrotic heart: balancing between deterioration and regeneration. Ramkisoensing AA, de Vries AA, Atsma DE, Schalij MJ, Pijnappels DA
Signalling between the various cell types in the heart has been investigated for decades. However, relatively little is known about the interplay between the cardiac fibroblasts and myofibroblasts, which help to maintain myocardial tissue structure and function, and resident cardiac or extracardiac stem cells involved in tissue homeostasis and repair. Much of our knowledge about these interactions is derived from experimental animal models, especially those of myocardial infarction and stem cell... Abstract
Cited 25 times since 2013 (2.2 per year) source: EuropePMC
Circulation. Arrhythmia and electrophysiology, Volume 6, Issue 2, 18 3 2013, Pages 380-391 Engraftment patterns of human adult mesenchymal stem cells expose electrotonic and paracrine proarrhythmic mechanisms in myocardial cell cultures. Askar SF, Ramkisoensing AA, Atsma DE, Schalij MJ, de Vries AA, Pijnappels DA
Background: After intramyocardial injection, mesenchymal stem cells (MSCs) may engraft and influence host myocardium. However, engraftment rate and pattern of distribution are difficult to control in vivo, hampering assessment of potential adverse effects. In this study, the role of the engraftment patterns of MSCs on arrhythmicity in controllable in vitro models is investigated. Methods and results: Cocultures of 4×10(5) neonatal rat cardiomyocytes and 7% or 28% adult human MSCs (hMSCs) in diff... Abstract
Cited 3 times since 2012 (0.3 per year) source: EuropePMC
Stem cells (Dayton, Ohio), Volume 30, Issue 12, 1 1 2012, Pages 2830-2834 Brief report: Misinterpretation of coculture differentiation experiments by unintended labeling of cardiomyocytes through secondary transduction: delusions and solutions. Ramkisoensing AA, De Vries AA, Schalij MJ, Atsma DE, Pijnappels DA
Cardiomyogenic differentiation of stem cells can be accomplished by coculture with cardiomyocytes (CMCs). To facilitate their identification, stem cells are often labeled through viral transduction with a fluorescent protein. A second marker to distinguish stem cell-derived CMCs from native CMCs is rarely used. This study aimed to investigate the occurrence of secondary transduction of unlabeled neonatal rat (nr) CMCs after coculture with human cells that had been transduced 0, 7, or 14 days ear... Abstract
Cited 17 times since 2012 (1.4 per year) source: EuropePMC
Stem cells (Dayton, Ohio), Volume 30, Issue 6, 1 1 2012, Pages 1236-1245 Gap junctional coupling with cardiomyocytes is necessary but not sufficient for cardiomyogenic differentiation of cocultured human mesenchymal stem cells. Ramkisoensing AA, Pijnappels DA, Swildens J, Goumans MJ, Fibbe WE, Schalij MJ, de Vries AA, Atsma DE
Gap junctional coupling is important for functional integration of transplanted cells with host myocardium. However, the role of gap junctions in cardiomyogenic differentiation of transplanted cells has not been directly investigated. The objective of this work is to study the role of connexin43 (Cx43) in cardiomyogenic differentiation of human mesenchymal stem cells (hMSCs). Knockdown of Cx43 gene expression (Cx43↓) was established in naturally Cx43-rich fetal amniotic membrane (AM) hMSCs, whil... Abstract
Cited 48 times since 2011 (3.8 per year) source: EuropePMC
PloS one, Volume 6, Issue 9, 9 2 2011, Pages e24164 Human embryonic and fetal mesenchymal stem cells differentiate toward three different cardiac lineages in contrast to their adult counterparts. Ramkisoensing AA, Pijnappels DA, Askar SF, Passier R, Swildens J, Goumans MJ, Schutte CI, de Vries AA, Scherjon S, Mummery CL, Schalij MJ, Atsma DE
Mesenchymal stem cells (MSCs) show unexplained differences in differentiation potential. In this study, differentiation of human (h) MSCs derived from embryonic, fetal and adult sources toward cardiomyocytes, endothelial and smooth muscle cells was investigated. Labeled hMSCs derived from embryonic stem cells (hESC-MSCs), fetal umbilical cord, bone marrow, amniotic membrane and adult bone marrow and adipose tissue were co-cultured with neonatal rat cardiomyocytes (nrCMCs) or cardiac fibroblasts... Abstract
Cited 26 times since 2011 (2 per year) source: EuropePMC
Cardiovascular research, Volume 90, Issue 2, 13 2 2011, Pages 295-304 Antiproliferative treatment of myofibroblasts prevents arrhythmias in vitro by limiting myofibroblast-induced depolarization. Askar SF, Ramkisoensing AA, Schalij MJ, Bingen BO, Swildens J, van der Laarse A, Atsma DE, de Vries AA, Ypey DL, Pijnappels DA
Aims: Cardiac fibrosis is associated with increased incidence of cardiac arrhythmias, but the underlying proarrhythmic mechanisms remain incompletely understood and antiarrhythmic therapies are still suboptimal. This study tests the hypothesis that myofibroblast (MFB) proliferation leads to tachyarrhythmias by altering the excitability of cardiomyocytes (CMCs) and that inhibition of MFB proliferation would thus lower the incidence of such arrhythmias. Methods and results: Endogenous MFBs in neon... Abstract
Cited 3 times since 2010 (0.2 per year) source: EuropePMC
Minerva medica, Volume 101, Issue 4, 1 1 2010, Pages 255-270 Young at heart. An update on cardiac regeneration. Smits AM, Ramkisoensing AA, Atsma DE, Goumans MJ
Cardiovascular disease remains one of the most important causes of mortality. Over the past decades important advances have been made in prevention and treatment of acute complications after myocardial infarction (MI). As a result, the number of patients that acutely die from MI has been reduced. Current treatments can not prevent the loss of cardiac contractility caused by cardiomyocyte death, and therefore patients that do survive MI are prone to develop progressive impaired cardiac function,... Abstract
Cited 88 times since 2008 (5.5 per year) source: EuropePMC
Circulation research, Volume 103, Issue 2, 12 2 2008, Pages 167-176 Forced alignment of mesenchymal stem cells undergoing cardiomyogenic differentiation affects functional integration with cardiomyocyte cultures. Pijnappels DA, Schalij MJ, Ramkisoensing AA, van Tuyn J, de Vries AA, van der Laarse A, Ypey DL, Atsma DE
Alignment of cardiomyocytes (CMCs) contributes to the anisotropic (direction-related) tissue structure of the heart, thereby facilitating efficient electrical and mechanical activation of the ventricles. This study aimed to investigate the effects of forced alignment of stem cells during cardiomyogenic differentiation on their functional integration with CMC cultures. Labeled neonatal rat (nr) mesenchymal stem cells (nrMSCs) were allowed to differentiate into functional heart muscle cells in dif... Abstract