Abstract
Human ether-a-go-go-related gene (hERG) trafficking inhibition is known to be one of the mechanisms of indirect hERG inhibition, resulting in QT prolongation and lethal arrhythmia. Pentamidine, an antiprotozoal drug, causes QT prolongation/Torsades de Pointes (TdP) via hERG trafficking inhibition, but 17-AAG, a geldanamycin derivative heat shock protein 90 (Hsp90) inhibitor, has not shown torsadogenic potential clinically, despite Hsp90 inhibitors generally being hypothesized to cause TdP by hERG trafficking inhibition. In the present study, we investigated the underlying mechanisms of both drugs’ actions on hERG channels using hERG-overexpressing CHO cells (hERG-CHOs) and human embryonic stem cell-derived cardiomyocytes (hES-CMs). The effects on hERG tail current and protein levels were evaluated using population patch clamp and Western blotting in hERG-CHOs. The effects on field potential duration (FPD) were recorded by a multi-electrode array (MEA) in hES-CMs. Neither drug affected hERG tail current acutely. Chronic treatment with each drug inhibited hERG tail current and decreased the mature form of hERG protein in hERG-CHOs, whereas the immature form of hERG protein was increased by pentamidine but decreased by 17-AAG. In MEA assays using hES-CMs, pentamidine time-dependently prolonged FPD, but 17-AAG shortened it. The FPD prolongation in hES-CMs upon chronic pentamidine exposure is relevant to its clinically reported arrhythmic risk. Cav1.2 or Nav1.5 current were not reduced by chronic application of either drug at a relevant concentration to hERG trafficking inhibition in human embryonic kidney (HEK293) cells. Therefore, the reason why chronic 17-AAG shortened the FPD despite the hERG trafficking inhibition occur is still unknown.
| Original language | English |
|---|---|
| Pages (from-to) | 221-230 |
| Number of pages | 10 |
| Journal | European Journal of Pharmacology |
| Volume | 842 |
| DOIs | |
| Publication status | Published - 2019 Jan 5 |
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Keywords
- 17-AAG
- Arrhythmia
- hERG trafficking
- Hsp90 inhibitor
- Human embryonic stem cell derived-cardiomyocytes (hES-CMs)
- Multi-electrode array (MEA)
ASJC Scopus subject areas
- Pharmacology
Cite this
Electrophysiological evaluation of pentamidine and 17-AAG in human stem cell-derived cardiomyocytes for safety assessment. / Asahi, Yumiko; Nomura, Fumimasa; Abe, Yasuyuki; Doi, Masafumi; Sakakura, Tomoko; Takasuna, Kiyoshi; Yasuda, Kenji.
In: European Journal of Pharmacology, Vol. 842, 05.01.2019, p. 221-230.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electrophysiological evaluation of pentamidine and 17-AAG in human stem cell-derived cardiomyocytes for safety assessment
AU - Asahi, Yumiko
AU - Nomura, Fumimasa
AU - Abe, Yasuyuki
AU - Doi, Masafumi
AU - Sakakura, Tomoko
AU - Takasuna, Kiyoshi
AU - Yasuda, Kenji
PY - 2019/1/5
Y1 - 2019/1/5
N2 - Human ether-a-go-go-related gene (hERG) trafficking inhibition is known to be one of the mechanisms of indirect hERG inhibition, resulting in QT prolongation and lethal arrhythmia. Pentamidine, an antiprotozoal drug, causes QT prolongation/Torsades de Pointes (TdP) via hERG trafficking inhibition, but 17-AAG, a geldanamycin derivative heat shock protein 90 (Hsp90) inhibitor, has not shown torsadogenic potential clinically, despite Hsp90 inhibitors generally being hypothesized to cause TdP by hERG trafficking inhibition. In the present study, we investigated the underlying mechanisms of both drugs’ actions on hERG channels using hERG-overexpressing CHO cells (hERG-CHOs) and human embryonic stem cell-derived cardiomyocytes (hES-CMs). The effects on hERG tail current and protein levels were evaluated using population patch clamp and Western blotting in hERG-CHOs. The effects on field potential duration (FPD) were recorded by a multi-electrode array (MEA) in hES-CMs. Neither drug affected hERG tail current acutely. Chronic treatment with each drug inhibited hERG tail current and decreased the mature form of hERG protein in hERG-CHOs, whereas the immature form of hERG protein was increased by pentamidine but decreased by 17-AAG. In MEA assays using hES-CMs, pentamidine time-dependently prolonged FPD, but 17-AAG shortened it. The FPD prolongation in hES-CMs upon chronic pentamidine exposure is relevant to its clinically reported arrhythmic risk. Cav1.2 or Nav1.5 current were not reduced by chronic application of either drug at a relevant concentration to hERG trafficking inhibition in human embryonic kidney (HEK293) cells. Therefore, the reason why chronic 17-AAG shortened the FPD despite the hERG trafficking inhibition occur is still unknown.
AB - Human ether-a-go-go-related gene (hERG) trafficking inhibition is known to be one of the mechanisms of indirect hERG inhibition, resulting in QT prolongation and lethal arrhythmia. Pentamidine, an antiprotozoal drug, causes QT prolongation/Torsades de Pointes (TdP) via hERG trafficking inhibition, but 17-AAG, a geldanamycin derivative heat shock protein 90 (Hsp90) inhibitor, has not shown torsadogenic potential clinically, despite Hsp90 inhibitors generally being hypothesized to cause TdP by hERG trafficking inhibition. In the present study, we investigated the underlying mechanisms of both drugs’ actions on hERG channels using hERG-overexpressing CHO cells (hERG-CHOs) and human embryonic stem cell-derived cardiomyocytes (hES-CMs). The effects on hERG tail current and protein levels were evaluated using population patch clamp and Western blotting in hERG-CHOs. The effects on field potential duration (FPD) were recorded by a multi-electrode array (MEA) in hES-CMs. Neither drug affected hERG tail current acutely. Chronic treatment with each drug inhibited hERG tail current and decreased the mature form of hERG protein in hERG-CHOs, whereas the immature form of hERG protein was increased by pentamidine but decreased by 17-AAG. In MEA assays using hES-CMs, pentamidine time-dependently prolonged FPD, but 17-AAG shortened it. The FPD prolongation in hES-CMs upon chronic pentamidine exposure is relevant to its clinically reported arrhythmic risk. Cav1.2 or Nav1.5 current were not reduced by chronic application of either drug at a relevant concentration to hERG trafficking inhibition in human embryonic kidney (HEK293) cells. Therefore, the reason why chronic 17-AAG shortened the FPD despite the hERG trafficking inhibition occur is still unknown.
KW - 17-AAG
KW - Arrhythmia
KW - hERG trafficking
KW - Hsp90 inhibitor
KW - Human embryonic stem cell derived-cardiomyocytes (hES-CMs)
KW - Multi-electrode array (MEA)
UR - http://www.scopus.com/inward/record.url?scp=85056534158&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85056534158&partnerID=8YFLogxK
U2 - 10.1016/j.ejphar.2018.10.046
DO - 10.1016/j.ejphar.2018.10.046
M3 - Article
VL - 842
SP - 221
EP - 230
JO - European Journal of Pharmacology
JF - European Journal of Pharmacology
SN - 0014-2999
ER -