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PARP-1 modulates amyloid beta peptide-induced neuronal damage
Sara Martire1, Andrea Fuso, Dante Rotili
1Department of Biochemical Sciences, Sapienza University, Rome, Italy.
Plos One
|October 3, 2013
Summary
Amyloid beta peptide (Aβ) triggers neurodegeneration by activating poly (ADP-ribose) polymerase 1 (PARP-1). Inhibiting PARP-1 with MC2050 reduces Aβ-induced cellular damage, suggesting a therapeutic target for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Amyloid beta peptide (Aβ) is implicated in neurodegeneration, partly through oxidative stress and DNA damage.
- Poly (ADP-ribose) polymerase 1 (PARP-1) is activated by DNA damage and plays a role in cellular responses.
Purpose of the Study:
- To investigate the role of PARP-1 in Aβ-induced neurotoxicity.
- To evaluate the efficacy of a novel PARP-1 inhibitor, MC2050, in mitigating Aβ-induced cellular damage.
Main Methods:
- SH-SY5Y neuroblastoma cells and CHO cells transfected with amyloid precursor protein were treated with Aβ25-35 fragment.
- PARP-1 activity, reactive oxygen species (ROS) levels, DNA damage, and protein expression (p53, Bcl-2) were measured.
- Experiments were also conducted in brain specimens from TgCRND8 transgenic mice.
Main Results:
- Aβ25-35 treatment enhanced PARP activity, increased intracellular ROS, and induced DNA damage.
- Pre-treatment with MC2050 inhibited Aβ-induced PARP activity and NF-kB activation.
- Aβ25-35 exposure led to increased p53 and decreased Bcl-2 protein levels, effects modulated by MC2050.
Conclusions:
- PARP-1 is a key mediator of cellular responses to Aβ exposure.
- Inhibition of PARP-1 by MC2050 attenuates Aβ-induced neurotoxic pathways.
- Targeting PARP-1 presents a potential therapeutic strategy for neurodegenerative conditions associated with amyloid pathology.
