Journal
MOLECULES
Volume 26, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/molecules26030543
Keywords
pH-responsive redox nanoparticles; human neuroblastoma SH-SY5Y cells; Parkinson’ s disease; 6-hydroxydopamine
Funding
- National Science Centre (NCN), Poland, within the SONATA-BIS 6 program [2016/22/E/NZ7/00641]
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6-hydroxydopamine-induced damage to SH-SY5Y cells can be mitigated by pH-responsive redox nanoparticles, particularly at pH 6.5, through protection of mitochondrial function, suggesting potential for future therapeutic applications.
The damage to SH-SY5Y cells by 6-hydroxydopamine (6-OHDA) is an established cellular model of Parkinson's disease (PD). Redox nanoparticles are a promising tool for therapy, including neurodegenerative diseases. As pH of the brain tissue at sites affected by PD is lowered down to 6.5, we studied the effect of pH-responsive redox nanoparticles (poly(ethylene glycol)-b-poly[4-(2,2,6,6-tetramethylpiperidine-1-oxyl)aminomethylstyrene]), which change their structure in a pH-dependent manner and become active below pH 7 (NRNPs (pH)), on the viability of SH-SY5Y cells treated with 6-OHDA at pH 6.5 and 7.4. Pretreatment of the cells with NRNPs (pH) (15-75 mu M) prior to the 6-OHDA treatment increased their survival in a concentration-dependent manner at pH 6.5, but not at pH 7.4. Among several parameters studied (ATP and GSH content, the level of reactive oxygen species, mitochondrial potential, mitochondrial mass), only the mitochondrial mass was dose-dependently protected by NRNPs (pH) at pH 6.5, but not at pH 7.4. These results indicate that the action of NRNPs (pH) on mitochondria underlies their protective effect in this cellular model of PD. These results may have potential importance for future applications of NRNPs (pH) in preclinical and perhaps clinical studies.
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