Introduction
Methods
Somatic cell reprogramming and cardiac differentiation
Cellular preparation
Electrophysiological recordings
Simultaneous intracellular Ca2+ measurements
Molecular biology studies
Computational modelling
Statistical analysis
Results
Increased systolic Ca2+ release from the SR of late hiPSC-CM cultures
Altered diastolic Ca2+-handling in late hiPSC-CM cultures
Maturation dependent increase of peak INa during long-term culture
Emergence of robust IK1 during long-term culture
Computational modelling of hiPSC-CM Ca2+-handling maturation
Identification and experimental corroboration of AP shortening during long-term culture
Discussion
Maturation of cytosolic Ca2+ homeostasis
Maturation of cellular electrophysiology
This study, “Early” | This study, “Late” | Zhao et al. [81] | Zhao et al. [81] | Ma et al. [50] | Lee et al. [43] | |
---|---|---|---|---|---|---|
Capacitance (pF) | 43 | 31 | 22–25 | 22–25 | 16 | |
INa | ||||||
Peak INa density | − 27 | − 71 | − 30 | − 53 | − 217 | − 163 |
Potential | − 25 | − 25 | − 40 | − 40 | − 20 | − 60 |
[Na]e for Peak INa (mM) | 5 | 5 | 10 | 10 | 10 | 5 |
[Na]e for Peak INa (mM) | 5 | 5 | 20 | 20 | 50 | 50 |
Temperature (°C) | 37 | 37 | 20 | 20 | 36 | 37 |
Erev (mV) | 0 | 0 | 18 | 18 | 43 | 62 |
Conductance (S/F) | 1065 | 2845 | 522 | 918 | 3447 | 1343 |
ICa,L | ||||||
ICa,L density | − 11 | − 29 | − 10 | − 13 | − 17 | − 7 |
Temperature (°C) | 37 | 37 | 22–25 | 22–25 | 22–25 | 37 |
IK1 | ||||||
IK1 density (pA/pF) | − 13 | − 48 | − 1 | − 2 | − 2 | − 5 |
Step potential | − 100 | − 100 | − 120 | − 120 | − 123 | − 150 |
[K]i for IK1 (mM) | 150 | 150 | 126 | 126 | 150 | 140 |
[K]e for IK1 (mM) | 20 | 20 | 6 | 6 | 5 | 5 |
Temperature (°C) | 37 | 37 | 20 | 20 | 37 | 37 |
Erev (mV) | − 54 | − 54 | − 77 | − 77 | − 89 | − 87 |
Conductance (S/F) | 274 | 1040 | 16 | 45 | 67 | 81 |
IKr | ||||||
IKr tail (pA/pF) | − 4 | − 3 | ||||
IKr step (pA/pF) | 1 | 1 | 0.4 | 2 | ||
Temperature (°C) | 20 | 20 | 20 | 20 | 37 | 37 |
Action Potential | ||||||
RMP (mV) | − 75 | − 73 | − 80 | − 80 | − 76 | − 66 |
dV/dtmax (V/s) | 30 | 67 | 125 | 130 | 28 | 45 |
APA (mV) | 110 | 123 | 140 | 140 | 104 | 108 |
APD90 (ms) | 394 | 259 | 290 | 300 | 415 | 492 |
Frequency | 0.5 | 0.5 | 1 | 1 | Spontaneous | Spontaneous |
Temperature (°C) | 37 | 37 | 20 | 20 | 37 | 37 |
Days after differentiation onset | 30–46 | 47–80 | 30–40 | 50–60 | 10–21* | 7–28* |
Veerman et al. [71]** | Herron et al. [23] | Sala et al. [63] | Doss et al. [12] | Lemoine et al. [46] | Horváth et al. [25] | |
---|---|---|---|---|---|---|
Capacitance (pF) | 28 | 31 | ||||
INa | ||||||
Peak INa density | − 94 | − 105 | − 10 | |||
Potential | − 20 | − 30 | − 30 | |||
[Na]i for Peak INa (mM) | 3 | 5 | 5 | |||
[Na]e for Peak INa (mM) | 20 | 20 | 5 | |||
Temperature (°C) | 20 | 20 | 20 | |||
Erev (mV) | 48 | 35 | 0 | |||
Conductance (S/F) | 1378 | 1615 | 343 | |||
ICa,L | ||||||
ICa,L density | − 50 | − 9 | ||||
Temperature (°C) | 36 | 37 | ||||
IK1 | ||||||
IK1 density (pA/pF) | − 6 | − 3 | − 33 | |||
Step potential | − 120 | − 100 | − 100 | |||
[K]i for IK1 (mM) | 148 | 120 | 150 | |||
[K]e for IK1 (mM) | 5 | 5 | 20 | |||
Temperature (°C) | 20 | 36 | 37 | |||
Erev (mV) | − 84 | − 83 | − 54 | |||
Conductance (S/F) | 173 | 201 | 717 | |||
IKr | ||||||
IKr tail (pA/pF) | 2 | 1 | ||||
IKr step (pA/pF) | ||||||
Temperature (°C) | 37 | 37 | ||||
Action Potential | ||||||
RMP (mV) | − 80** | − 71 | − 48 | − 66 | ||
dV/dtmax (V/s) | 230 | 147 | 24 | |||
APA (mV) | 120 | 116 | 90 | 103 | ||
APD90 (ms) | 160 | NA | 135 | 325 | ||
Frequency | 1 | 1 | Spontaneous | |||
Temperature (°C) | 37 | 37 | 37 | 37 | ||
Days after differentiation onset | 39–44 | 4–7* | 20–30 | 35–74 | 42 | 42 |
Lemoine et al. [46] | Lemoine et al. [45] | Horváth et al. [25] | Tiburcy et al. [68] | |
---|---|---|---|---|
Capacitance (pF) | 28 | 47 | ||
INa | ||||
Peak INa density | − 19 | |||
Potential | − 30 | |||
[Na]i for Peak INa (mM) | 5 | |||
[Na]e for Peak INa (mM) | 5 | |||
Temperature (°C) | 20 | |||
Erev (mV) | 0 | |||
Conductance
(S/F) | 633 | |||
ICa,L | ||||
ICa,L density | ||||
Temperature (°C) | ||||
IK1 | ||||
IK1 density (pA/pF) | − 14 | |||
Step potential | − 100 | |||
[K]i for IK1 (mM) | 150 | |||
[K]e for IK1 (mM) | 20 | |||
Temperature (°C) | 20 | |||
Erev (mV) | − 51 | |||
Conductance (S/F) | 285 | |||
IKr | ||||
IKr tail (pA/pF) | ||||
IKr step (pA/pF) | ||||
Temperature (°C) | ||||
Action Potential | ||||
RMP (mV) | − 78 | − 78 | − 75 | − 72 |
dV/dtmax (V/s) | 219 | 348 | 107 | |
APA (mV) | 103 | 109 | 97 | |
APD90 (ms) | NA | 255 | 271 | 436 |
Frequency (Hz) | 1 | 1 | 1 | Spontaneous |
Temperature (°C) | 37 | 37 | 37 | 37 |
Days after differentiation onset | 42 | 39–114 | 42 | NA |
Sakakibara et al. [61] | Valdivia et al. [69] | Magyar et al. [51]** | Mewes et al. [53] | Konarzewska et al. [41] | Koumi et al. [42]* | |
---|---|---|---|---|---|---|
Capacitance (pF) | 194 | 168 | 189 | 96 | ||
INa | ||||||
Peak INa density | − 20 | − 49 | ||||
Potential | − 40 | − 40 | ||||
[Na]i for Peak INa (mM) | 5 | 1 | ||||
[Na]e for Peak INa (mM) | 5 | 5 | ||||
Temperature (°C) | 17 | 20 | ||||
Erev (mV) | 0 | 41 | ||||
Conductance (S/F) | 505 | 608 | ||||
ICa,L | ||||||
ICa,L density | 10 | 4 | ||||
Temperature (°C) | 37 | 21–23 | ||||
IK1 | ||||||
IK1 density (pA/pF) | − 4 | − 18 | − 30 | |||
Step potential | − 100 | − 140 | − 120 | |||
[K]i for IK1 (mM) | 120 | 525 | 141 | |||
[K]e for IK1 (mM) | 5 | 4 | 5 | |||
Temperature (°C) | 37 | 20 | 37 | |||
Erev (mV) | − 83 | − 123 | − 87 | |||
Conductance (S/F) | 210 | 1083 | 914 | |||
IKr | ||||||
IKr tail (pA/pF) | 0 | |||||
IKr step (pA/pF) | ||||||
Temperature (°C) | 37 | |||||
Action Potential | ||||||
RMP (mV) | − 82 | |||||
dV/dtmax (V/s) | 215 | |||||
APA (mV) | 107 | |||||
APD90 (ms) | 213 | 395 | ||||
Frequency | 1 | 1 | ||||
Temperature (°C) | 37 | 37 | ||||
Heart failure patients (+/−) | + | − | − | − | − | − |
Bailly et al. [2] | Iost et al. [28] | Hartmann et al. [20]* | Lemoine et al. [46]** | Lemoine et al. [45]** | |
---|---|---|---|---|---|
Capacitance (pF) | |||||
INa | |||||
Peak INa density | |||||
Potential | |||||
[Na]i for Peak INa (mM) | |||||
[Na]e for Peak INa (mM) | |||||
Temperature (°C) | |||||
Erev (mV) | |||||
Conductance (S/F) | |||||
ICa,L | |||||
ICa,L density | |||||
Temperature (°C) | |||||
IK1 | |||||
IK1 density (pA/pF) | − 60 | ||||
Step potential | − 170 | ||||
[K]i for IK1 (mM) | 120 | ||||
[K]e for IK1 (mM) | 4 | ||||
Temperature (°C) | 20 | ||||
Erev (mV) | − 86 | ||||
Conductance (S/F) | 714 | ||||
IKr | |||||
IKr tail (pA/pF) | 0.3 | ||||
IKr step (pA/pF) | |||||
Temperature (°C) | 37 | ||||
Action Potential | |||||
RMP (mV) | − 80 | − 75 | − 78 | ||
dV/dtmax (V/s) | 182 | 253 | 176 | ||
APA (mV) | 130 | 105 | 111 | ||
APD90 (ms) | 553 | NA | 397 | ||
Frequency | 1 | 1 | 1 | ||
Temperature (°C) | 37 | 37 | 37 | ||
Heart failure patients (+/−) | − | − | + | + | + |