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Pregled bibliografske jedinice broj: 328484

Mitochondria morphology and DNA content upon sublethal exposure to beta-amyloid 1-42 peptide

Diana, Andrea; Šimić, Goran; Sinforiani, Elena; Orrù , Nicola; Pichiri, Giuseppina; Bono, Giorgio
Mitochondria morphology and DNA content upon sublethal exposure to beta-amyloid 1-42 peptide // Collegium Antropologicum, 32 (2008), S1; 51-58 (međunarodna recenzija, članak, znanstveni)

Mitochondria morphology and DNA content upon sublethal exposure to beta-amyloid 1-42 peptide

Diana, Andrea ; Šimić, Goran ; Sinforiani, Elena ; Orrù , Nicola ; Pichiri, Giuseppina ; Bono, Giorgio

Collegium Antropologicum (0350-6134) 32 (2008), S1; 51-58

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Amyloid toxicity; mitochondrial DNA; neuroblastoma cell culture; oxidative stress

Brains affected by Alzheimer's disease (AD) show a large spectrum of mitochondrial alterations at both morphological and genetic level. The causal link between amyloid beta peptides (A beta) and mitochondrial dysfunction has been established in cellular models of AD using A beta concentrations capable of triggering massive neuronal death. However, mitochondrial changes related to sublethal exposure to A beta are less known. Here we show that subtoxic, 1 micromolar A beta(1-42) exposure does not change the mitochondrial shape of living cells, as visualized upon the uptake of the non-potentiometric fluorescent probe Mitotracker Green and enhanced yellow fluorescent protein (EYFP)-tagged cytochrome c oxidase expression. Immunolocalization of oxidative adducts 8-hydroxy-2'-deoxyguanosine, 8-hydroxyguanine and 8-hydroxyguanosine demonstrates that one-micromolar concentration of A beta(1-42) is also not sufficient to elicit dramatic qualitative changes in the RNA/DNA oxidative products. However, in comparison with controls, semi-quantitative analysis of the overall mitochondrial mass by integrated fluorescence intensity reveals an ongoing down-regulation in mitochondrial biosynthesis or, conversely, an enhanced autophagic demise of A beta treated cells. Furthermore, a significant increase of the full-length mitochondrial DNA (mtDNA) from A beta-treated versus control cells is found, as measured by long range polymerase chain reaction (PCR). Such up-regulation is accompanied by extensive fragmentation of the unamplified mtDNA, probably due to the detrimental effect of A beta. We interpret these results as a sequence of compensatory responses induced by mtDNA damage, which are devoted to repression of oxidative burst. In conclusion, our findings suggest that early therapeutic interventions aimed at prevention of mitochondrial oxidative damage may delay AD progression and help in treating AD patients.

Izvorni jezik

Znanstvena područja
Temeljne medicinske znanosti, Kliničke medicinske znanosti, Psihologija


Projekt / tema
108-1081870-1942 - Fosforilacija tau proteina u razvitku i Alzheimerovoj bolesti (Goran Šimić, )

Medicinski fakultet, Zagreb

Autor s matičnim brojem:
Goran Šimić, (198614)

Časopis indeksira:

  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Social Science Citation Index (SSCI)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus

Uključenost u ostale bibliografske baze podataka:

  • Abstracts in Anthropology
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  • Arts and Humanities Search
  • Sociological Abstracts