Abstract:
:Opening of the mitochondrial permeability transition pore has increasingly been implicated in excitotoxic, ischemic, and apoptotic cell death, as well as in several neurodegenerative disease processes. However, much of the work directly characterizing properties of the transition pore has been performed in isolated liver mitochondria. Because of suggestions of tissue-specific differences in pore properties, we directly compared isolated brain mitochondria with liver mitochondria and used three quantitative biochemical and ultrastructural measurements of permeability transition. We provide evidence that brain mitochondria do not readily undergo permeability transition upon exposure to conditions that rapidly induce the opening of the transition pore in liver mitochondria. Exposure of liver mitochondria to transition-inducing agents led to a large, cyclosporin A-inhibitable decrease in spectrophotometric absorbance, a loss of mitochondrial glutathione, and morphologic evidence of matrix swelling and disruption, as expected. However, we found that similarly treated brain mitochondria showed very little absorbance change and no loss of glutathione. The absence of response in brain was not simply due to structural limitations, since large-amplitude swelling and release of glutathione occurred when membrane pores unrelated to the transition pore were formed. Additionally, electron microscopy revealed that the majority of brain mitochondria appeared morphologically unchanged following treatment to induce permeability transition. These findings show that isolated brain mitochondria are more resistant to induction of permeability transition than mitochondria from liver, which may have important implications for the study of the mechanisms involved in neuronal cell death.
journal_name
Exp Neuroljournal_title
Experimental neurologyauthors
Berman SB,Watkins SC,Hastings TGdoi
10.1006/exnr.2000.7438keywords:
subject
Has Abstractpub_date
2000-08-01 00:00:00pages
415-25issue
2eissn
0014-4886issn
1090-2430pii
S0014-4886(00)97438-7journal_volume
164pub_type
杂志文章abstract::The dependence of movement on visual information was compared for healthy individuals and Stage II-III patients with Parkinson's disease (PD). A time delay (0-1400 ms) was introduced into a visually guided motor tracking task which required the subject to maintain constant index finger position relative to a stationar...
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