ISSN:
1435-1463
Keywords:
Keywords: Cytotoxicity
;
catechol isoquinolines
;
endogenous neurotoxin
;
hydroxyl radical
;
oxidative phosphorylation
;
SH-SY5Y cells.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary. The mechanism of the cytotoxicity of endogenous dopaminederived (R)-1,2-dimethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline [(R)-N-methylsalsolinol] to differentiated human dopaminergic neuroblastoma SH-SY5Y cells was studied using a reduction-oxidation indicator, Alamar Blue. N-Methylsalsolinol and its oxidation product, 1,2-dimethyl-6,7-dihydroxyisoquinolinium ion, were found to inhibit oxidative phosphorylation, as shown by the Redox capacity. Antioxidants, such as reduced glutathione, catalase, Tris and n-propyl gallate, reduced the cytotoxicity of N-methylsalsolinol, suggesting that hydroxyl radical was the major reactive oxygen species for the cytotoxicity. Deprenyl also protected the cells from the decrease of the Redox capavity by N-methylsalsolinol. However, antioxidants did not protect the cells from the cytotoxicity of the catechol isoquinolinium ion. The results suggest that oxidative stress induced by hydroxyl radical may be involved in the cell death of dopaminergic neurons by N-methylsalsolinol.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s007020050065
Permalink