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  • Title: 17β-estradiol protects cerebellar granule cells against β-amyloid-induced toxicity via the apoptotic mitochondrial pathway.
    Author: Napolitano M, Costa L, Piacentini R, Grassi C, Lanzone A, Gulino A.
    Journal: Neurosci Lett; 2014 Feb 21; 561():134-9. PubMed ID: 24287378.
    Abstract:
    Alzheimer's disease (AD) is a well-studied neurodegenerative disorder; nevertheless, significant therapeutic agents for the pharmacological treatment of this neuropathology are unavailable to date. The toxicity of amyloid β-peptide (Aβ) has been implicated as a critical cause in the development of AD, and Aβ-amyloid-induced toxicity is typically associated with apoptosis. Here, we investigated the effect of 17β-estradiol (E2) on Aβ-induced toxicity in cerebellar granule cells (CGCs). Our data showed a significant induction of apoptosis in neurons treated with Aβ, and the addition of E2 reduced this effect. In addition, E2 reduced the Aβ-induced up-regulation of Bax and down-regulation of Bcl-xL, and inhibited the subsequent mitochondrial release of cytochrome c and activation of caspase-3. Moreover, E2 inhibited Aβ-induced c-Jun N-terminal protein kinase (JNK) activation. Taken together, these findings indicate that E2 protects against Aβ-induced apoptosis in neuronal cells by preventing mitochondrial dysfunction and interfering with the JNK signalling cascade.
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