1-methyl-4-phenyl-pyridinium ion (MPP+) causes DNA fragmentation and increases the Bcl-2 expression in human neuroblastoma, SH-SY5Y cells, through different mechanisms.

Abstract:

:Apoptosis has been shown to be induced by some pathological stimuli. MPP+ is a neurotoxin and an inducer of parkinsonism. When SH-SY5Y cells, human neuroblastoma cell line, were treated with MPP+, cell death estimated by lactate dehydrogenase (LDH) leakage assay occurred. The cell death was associated with the DNA fragmentation into nucleosomal fragments at 180 bp, suggesting that MPP(+)-induced cell death of SH-SY5Y cells occurs through apoptosis. Although SH-SY5Y cells natively express Bcl-2 protein, which inhibits apoptosis, the level of Bcl-2 protein in SH-SY5Y cells increased with increases in the treatment periods of MPP+. MPP+ inhibits the mitochondrial respiratory chain. The other inhibitors of the mitochondrial respiratory chain, antimycin A and oligomycin, also caused cell death associated with DNA fragmentation, but did not increase the Bcl-2 protein level, suggesting that an MPP(+)-induced apoptosis may be due to the inhibition of the mitochondrial respiratory chain but the MPP(+)-induced increase in the Bcl-2 protein level is not due to it. A protein kinase inhibitor, staurosporine, inhibited the MPP(+)-induced increase in the Bcl-2 protein level, but not the MPP(+)-induced cell death. These results also suggest that the mechanism by which MPP+ increases the Bcl-2 protein level is different from that of MPP(+)-induced cell death.

journal_name

Brain Res

journal_title

Brain research

authors

Itano Y,Nomura Y

doi

10.1016/0006-8993(95)01120-x

subject

Has Abstract

pub_date

1995-12-18 00:00:00

pages

240-45

issue

2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(95)01120-X

journal_volume

704

pub_type

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