Aluminum maltolate-induced toxicity in NT2 cells occurs through apoptosis and includes cytochrome c release.
Aluminum (Al) compounds are neurotoxic and have been shown to induce experimental neurodegeneration although the mechanism of this effect is unclear. In order to study this neurotoxic effect of Al, we have developed an in vitro model system using Al maltolate and human NT2 cells. Al maltolate at 500 microM caused significant cell death with a 24-h incubation and this toxicity was even more evident after 48 h. Lower doses of Al maltolate were also effective, but required a longer incubation for cell death. Nuclear fragmentation suggestive of apoptosis was observed as early as three hours and increased substantially through 24 h. Chromatin condensation and nuclear fragmentation were confirmed by electron microscopy. In addition, TUNEL positive nuclei were also observed. The release of cytochrome c was demonstrated with Western blot analysis. This in vitro model using human cells adds to our understanding of Al neurotoxicity and could provide insight into the neurodegenerative processes in human disease.
Griffioen
Kathleen J S
KJ
Department of Biology & Chemistry, Liberty University, 1971 University Blvd., Lynchburg, VA 24502, USA.
Ghribi
Othman
O
Fox
Nena
N
Savory
John
J
DeWitt
David A
DA
D000535:Aluminum / Q000633:toxicity; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000187:drug effects / Q000648:ultrastructure; D002470:Cell Survival / Q000187:drug effects; D045304:Cytochromes c / Q000378:metabolism*; D006801:Humans; D020287:In Situ Nick-End Labeling; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008854:Microscopy, Electron; D008928:Mitochondria / Q000187:drug effects / Q000648:ultrastructure; D009474:Neurons / Q000187:drug effects* / Q000201:enzymology; D009942:Organometallic Compounds / Q000633:toxicity*; D011753:Pyrones / Q000633:toxicity*
D009942:Organometallic Compounds; D011753:Pyrones; C067527:aluminum maltolate; D045304:Cytochromes c; D000535:Aluminum; D007770:L-Lactate Dehydrogenase