Co[Cl.sub.2] induces apoptosis through the mitochondria- and death receptor-mediated pathway in the mouse embryonic stem cells

Embryonic hypoxia/ischemia is a major cause of a poor fetal outcome and future neonatal and adult handicaps. However, biochemical cellular events in mouse embryonic stem (mES) cells during hypoxia remains unclear. This study investigated the underlying mechanism of apoptosis in mES cells under Co[Cl...

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Veröffentlicht in:Molecular and cellular biochemistry 2013-07, Vol.379 (1-2), p.133
Hauptverfasser: Lee, Jin-Ha, Choi, Seong-Ho, Baek, Min-Woo, Kim, Mi-Hwa, Kim, Heong-Jun, Kim, Sun-Hun, Oh, Sang-Jin, Park, Hong-Ju, Kim, Won-Jae, Jung, Ji-Yeon
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container_issue 1-2
container_start_page 133
container_title Molecular and cellular biochemistry
container_volume 379
creator Lee, Jin-Ha
Choi, Seong-Ho
Baek, Min-Woo
Kim, Mi-Hwa
Kim, Heong-Jun
Kim, Sun-Hun
Oh, Sang-Jin
Park, Hong-Ju
Kim, Won-Jae
Jung, Ji-Yeon
description Embryonic hypoxia/ischemia is a major cause of a poor fetal outcome and future neonatal and adult handicaps. However, biochemical cellular events in mouse embryonic stem (mES) cells during hypoxia remains unclear. This study investigated the underlying mechanism of apoptosis in mES cells under Co[Cl.sub.2]-induced hypoxic/ischemic conditions. Co[Cl.sub.2] enhanced the expression of hypoxia-inducible factor1a (HIF-1α) and the accumulation of reactive oxygen species in mES cells. The Co[Cl.sub.2]-treated mES cells showed a decrease in cell viability as well as typical apoptotic changes, cell shrinkage, chromatin condensation, and nuclear fragmentation and an extended [G.sub.2]/M phase of the cell cycle. Co[Cl.sub.2] augmented the release of cytochrome c into the cytosol from the mitochondria with a concomitant loss of the mitochondrial transmembrane potential (Δ[Ψ.sub.m]) and upregulated the voltage-dependent anion channel. In addition, Co[Cl.sub.2]-induced caspase-3, -8, and -9 activation and upregulation of p53 level, whereas downregulated Bcl-2 and BclxL, a member of the anti-apoptotic Bcl-2 family in mES cells. Furthermore, Co[Cl.sub.2] led to the upregulation of Fas and Fas-ligand, which are the death receptor assemblies, as well as the cleavage of Bid in mES cells. These results suggest that Co[Cl.sub.2] induces apoptosis through both mitochondriaand death receptor-mediated pathways that are regulated by the Bcl-2 family in mES cells. Keywords Co[Cl.sub.2] * mES cells * Apoptosis * Bcl-2 family * Caspase * Fas * Fas-L
doi_str_mv 10.1007/s11010-013-1635-5
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However, biochemical cellular events in mouse embryonic stem (mES) cells during hypoxia remains unclear. This study investigated the underlying mechanism of apoptosis in mES cells under Co[Cl.sub.2]-induced hypoxic/ischemic conditions. Co[Cl.sub.2] enhanced the expression of hypoxia-inducible factor1a (HIF-1α) and the accumulation of reactive oxygen species in mES cells. The Co[Cl.sub.2]-treated mES cells showed a decrease in cell viability as well as typical apoptotic changes, cell shrinkage, chromatin condensation, and nuclear fragmentation and an extended [G.sub.2]/M phase of the cell cycle. Co[Cl.sub.2] augmented the release of cytochrome c into the cytosol from the mitochondria with a concomitant loss of the mitochondrial transmembrane potential (Δ[Ψ.sub.m]) and upregulated the voltage-dependent anion channel. In addition, Co[Cl.sub.2]-induced caspase-3, -8, and -9 activation and upregulation of p53 level, whereas downregulated Bcl-2 and BclxL, a member of the anti-apoptotic Bcl-2 family in mES cells. Furthermore, Co[Cl.sub.2] led to the upregulation of Fas and Fas-ligand, which are the death receptor assemblies, as well as the cleavage of Bid in mES cells. These results suggest that Co[Cl.sub.2] induces apoptosis through both mitochondriaand death receptor-mediated pathways that are regulated by the Bcl-2 family in mES cells. 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However, biochemical cellular events in mouse embryonic stem (mES) cells during hypoxia remains unclear. This study investigated the underlying mechanism of apoptosis in mES cells under Co[Cl.sub.2]-induced hypoxic/ischemic conditions. Co[Cl.sub.2] enhanced the expression of hypoxia-inducible factor1a (HIF-1α) and the accumulation of reactive oxygen species in mES cells. The Co[Cl.sub.2]-treated mES cells showed a decrease in cell viability as well as typical apoptotic changes, cell shrinkage, chromatin condensation, and nuclear fragmentation and an extended [G.sub.2]/M phase of the cell cycle. Co[Cl.sub.2] augmented the release of cytochrome c into the cytosol from the mitochondria with a concomitant loss of the mitochondrial transmembrane potential (Δ[Ψ.sub.m]) and upregulated the voltage-dependent anion channel. In addition, Co[Cl.sub.2]-induced caspase-3, -8, and -9 activation and upregulation of p53 level, whereas downregulated Bcl-2 and BclxL, a member of the anti-apoptotic Bcl-2 family in mES cells. Furthermore, Co[Cl.sub.2] led to the upregulation of Fas and Fas-ligand, which are the death receptor assemblies, as well as the cleavage of Bid in mES cells. These results suggest that Co[Cl.sub.2] induces apoptosis through both mitochondriaand death receptor-mediated pathways that are regulated by the Bcl-2 family in mES cells. 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However, biochemical cellular events in mouse embryonic stem (mES) cells during hypoxia remains unclear. This study investigated the underlying mechanism of apoptosis in mES cells under Co[Cl.sub.2]-induced hypoxic/ischemic conditions. Co[Cl.sub.2] enhanced the expression of hypoxia-inducible factor1a (HIF-1α) and the accumulation of reactive oxygen species in mES cells. The Co[Cl.sub.2]-treated mES cells showed a decrease in cell viability as well as typical apoptotic changes, cell shrinkage, chromatin condensation, and nuclear fragmentation and an extended [G.sub.2]/M phase of the cell cycle. Co[Cl.sub.2] augmented the release of cytochrome c into the cytosol from the mitochondria with a concomitant loss of the mitochondrial transmembrane potential (Δ[Ψ.sub.m]) and upregulated the voltage-dependent anion channel. 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subjects Apoptosis
Embryonic stem cells
Investigations
Mitochondrial DNA
title Co[Cl.sub.2] induces apoptosis through the mitochondria- and death receptor-mediated pathway in the mouse embryonic stem cells
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