Abstract
Methamphetamine (Meth) is a widely abused stimulant. High-dose Meth induces degeneration of dopaminergic neurons through p53-mediated apoptosis. A recent study indicated that treatment with the p53 inhibitor, pifithrin-alpha (PFT-α), antagonized Meth-mediated behavioral deficits in mice. The mechanisms underpinning the protective action of PFT-α against Meth have not been identified, and hence, their investigation is the focus of this study. Primary dopaminergic neuronal cultures were prepared from rat embryonic ventral mesencephalic tissue. High-dose Meth challenge reduced tyrosine hydroxylase immunoreactivity and increased terminal deoxynucleotidyl transferase-mediated dNTP nick-end labeling (TUNEL) labeling. PFT-α significantly antagonized these responses. PFT-α also reduced Meth-activated translocation of p53 to the nucleus, an initial step before transcription. Previous studies have indicated that p53 can also activate cell death through transcription-independent pathways. We found that PFT-α attenuated endoplasmic reticulum (ER) stressor thapsigargin (Tg)-mediated loss of dopaminergic neurons. ER stress was further monitored through the release of Gaussia luciferase (GLuc) from SH-SY5Y cells overexpressing GLuc-based Secreted ER Calcium-Modulated Protein (GLuc-SERCaMP). Meth or Tg significantly increased GLuc release in to the media, with PFT-α significantly reducing GLuc release. Additionally, PFT-α significantly attenuated Meth-induced CHOP expression. In conclusion, our data indicate that PFT-α is neuroprotective against Meth-mediated neurodegeneration via transcription-dependent nuclear and -independent cytosolic ER stress pathways.
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Abbreviations
- BSA:
-
Bovine serum albumin
- CHOP:
-
CCAAT/enhancer-binding protein (C/EBP) homologous protein
- DIV:
-
Day in vitro
- DMEM:
-
Dulbecco’s modified Eagle medium
- DMSO:
-
Dimethyl sulfoxide
- ER:
-
Endoplasmic reticulum
- GLuc:
-
Gaussia luciferase
- Meth:
-
Methamphetamine
- MPTP:
-
1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
- PBS:
-
Phosphate-buffered saline
- PFA:
-
Paraformaldehyde
- PFT-α:
-
Pifithrin-alpha
- SERCaMP:
-
Secreted ER calcium-modulated protein
- Tg:
-
Thapsigargin
- TH:
-
Tyrosine hydroxylase
- TUNEL:
-
Terminal deoxynucleotidyl transferase-mediated dNTP nick-end labeling
- VM:
-
Ventral mesencephalon
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This research was supported in part by (i) the Ministry of Science and Technology, Taiwan (MOST 105-2320-B-400-012-MY3, 107-2314-B-030-009); (ii) the National Health Research Institutes, Taiwan; and (iii) the Intramural Research Programs of the National Institute on Aging and National Institute on Drug Abuse, NIH, USA.
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Chen, YH., Bae, E., Chen, H. et al. Pifithrin-Alpha Reduces Methamphetamine Neurotoxicity in Cultured Dopaminergic Neurons. Neurotox Res 36, 347–356 (2019). https://doi.org/10.1007/s12640-019-00050-w
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DOI: https://doi.org/10.1007/s12640-019-00050-w