Abstract
Oxidative stress and nitrosative stress are both suggested to be involved in cardiac ischemia-reperfusion (I/R) injury. Using time-lapse confocal microscopy of cardiomyocytes and high-affinity O2−• and Zn2+ probes, this study is the first to show that I/R, reactive oxygen species (ROS), and reactive nitrogen species (RNS) all cause a marked increase in the [O2−•]i, resulting in cytosolic and mitochondrial Zn2+ release. Exposure to a cell-penetrating, high-affinity Zn2+i chelator, TPEN, largely abolished the Zn2+i release and markedly protected myocytes from I/R-, ROS-, RNS-, or Zn2+/K+ (Zn2+i supplementation)-induced myocyte apoptosis for at least 24 h after TPEN removal. Flavonoids and U0126 (a MEK1/2 inhibitor) largely inhibited the myocyte apoptosis and the TPEN-sensitive I/R- or Zn2+i supplement-induced persistent extracellular signal-regulated kinase 1 and 2 (ERK1/2) phosphorylation, dephosphorylation of p-Ser9 on glycogen synthase kinase 3β (GSK-3β), and the translocation into and accumulation of p-Tyr216 GSK-3β and p53 in, the nucleus. Silencing of GSK-3β or p53 expression was cardioprotective, indicating that activation of the ERK–GSK-3β–p53 signaling pathway is involved in Zn2+-sensitive myocyte death. Moreover, the ERK-dependent Noxa–myeloid cell leukemia-1 (Mcl-1) pathway is also involved, as silencing of Noxa expression was cardioprotective and U0126 abolished both the increase in Noxa expression and in Mcl-1 degradation. Thus, acute upstream Zn2+i chelation at the start of reperfusion and the use of natural products, that is, flavonoids, may be beneficial in the treatment of cardiac I/R injury.
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Abbreviations
- I/R injury:
-
ischemia/reperfusion injury
- ROS:
-
reactive oxygen species
- RNS:
-
reactive nitrogen species
- Zn2+i:
-
intracellular free Zn2+ ions
- TPEN, N,N,N′,N′:
-
tetrakis (2-pyridylmethyl) ethylenediaminepentaethylene
- NAC:
-
N-acetylcysteine
- DTT:
-
dithiothreitol
- MT:
-
metallothionein
- mPTP:
-
mitochondrial permeability transition pore
- PFT-α:
-
pifithrin-α
- MEK1/2:
-
kinase mitogen protein kinase kinase 1 and 2
- ERK1/2:
-
extracellular signal-regulated kinase 1 and 2
- GSK-3β:
-
glycogen synthase kinase-3β
- Mcl-1:
-
myeloid cell leukemia-1
- LOX:
-
lipoxygenase
- NFκB:
-
nuclear factor κB
- HIF1α:
-
hypoxia-inducible factor-1
- PKC:
-
protein kinase C
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Acknowledgements
We gratefully thank the National Science Council of Taiwan for financial support (grants: NSC-98-2320-B-002-042-MY3 and NSC 99-2314-B-166-001-MY3). We also gratefully acknowledge the Second Core Laboratory of Department of Medical Research, National Taiwan University Hospital for expert technical assistance.
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Lin, CL., Tseng, HC., Chen, WP. et al. Intracellular zinc release-activated ERK-dependent GSK-3β–p53 and Noxa–Mcl-1 signaling are both involved in cardiac ischemic-reperfusion injury. Cell Death Differ 18, 1651–1663 (2011). https://doi.org/10.1038/cdd.2011.80
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DOI: https://doi.org/10.1038/cdd.2011.80
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