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Bcl-X(L) inhibits apoptosis and necrosis produced by Alzheimer's beta-amyloid1-40 peptide in PC12 cells.

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By Tan J, Town T, Placzek A, Kundtz A, Yu H, Mullan M • www.ProHealth.com • September 3, 1999


Recent studies have shown that neuronal apoptosis induced by the Alzheimer's disease (AD) beta-amyloid peptide (Abeta) is related to alteration of the Bax/Bcl-2 ratio. It has been demonstrated that Bcl-X(L) (Bcl-X(L) = protein, bcl-X(L) = gene), a Bcl-2-related protein, prevents apoptosis in mammalian cells. Additionally, TGF-beta1 is able to protect cultured neuronal cells from Abeta-induced apoptosis via upregulation of bcl-X(L) and bcl-2 gene expression.

We show that Abeta treatment (500 nM, freshly solubilized) results in apoptosis and necrosis in differentiated PC12 cells maintained with a low dose of NGF-beta (1 ng/ml). To investigate whether transfection of PC12 cells with bcl-X(L) could block Abeta-induced apoptosis, we transfected these cells with a bcl-X(L) construct (pcDNA-bcl-X(L)). Data show that bcl-X(L) significantly inhibits both early-stage apoptosis and late-stage apoptosis/necrosis produced by Abeta treatment (1000 nM) in pcDNA3-bcl-X(L)-transfected PC12 cells as compared with pcDNA3 vector-transfected PC12 cells.

These results suggest that Bcl-X(L) exhibits both anti-necrotic as well as anti-apoptotic roles in Abeta-challenged PC12 cells.

Source: Neurosci Lett 1999 Sep 3;272(1):5-8
PMID: 10507529, UI: 99435363

(The Roskamp Institute, Tampa, FL 33613-4799, USA. jtan@com1.med.usf.edu)






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