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Increased vulnerability of ApoE4 neurons to HIV proteins and opiates: protection by diosgenin and L-deprenyl.

Abstract：

:Human immunodeficiency virus (HIV) infection continues to rise in drug-abusing populations and causes a dementing illness in a subset of individuals. Factors contributing to the development of dementia in this population remain unknown. We found that HIV-infected individuals with the E4 allele of Apolipoprotein E (ApoE) or history of intravenous drug abuse had increased oxidative stress in the CNS. In vitro studies showed that HIV proteins, gp120 and Tat, Tat + morphine but not tumor necrosis factor-alpha (TNF-alpha), caused increased neurotoxicity in human neuronal cultures with ApoE4 allele. Microarray analysis showed a differential alteration of transcripts involved in energy metabolism in cultures of ApoE3 and 4 neurons upon treatment with Tat + morphine. This was confirmed using assays of mitochondrial function and exposure of the neurons to Tat + morphine. Using this in vitro model, we screened a number of novel antioxidants and found that only L-deprenyl and diosgenin protected against the neurotoxicity of Tat + morphine. Furthermore, Tat-induced oxidative stress impaired morphine metabolism which could also be prevented by diosgenin. In conclusion, opiate abusers with HIV infection and the ApoE4 allele may be at increased risk of developing dementia. L-deprenyl and a plant estrogen, diosgenin, may have therapeutic potential in this population.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Turchan-Cholewo J,Liu Y,Gartner S,Reid R,Jie C,Peng X,Chen KC,Chauhan A,Haughey N,Cutler R,Mattson MP,Pardo C,Conant K,Sacktor N,McArthur JC,Hauser KF,Gairola C,Nath A

doi

10.1016/j.nbd.2006.02.005

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

109-19

issue

1

eissn

0969-9961

issn

1095-953X

pii

S0969-9961(06)00037-4

journal_volume

23

pub_type

杂志文章

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