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• W2126376871 endingPage "33" @default.
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• W2126376871 abstract "The initial insight into the genetic basis of apoptosis, or programmed cell death, was gained from ingenious studies of the roundworm Caenorhabditis elegans (for review, see Horvitz 1999). These studies revealed a linear pathway whereby the products of two genes, designated Ced-3 andCed-4, were necessary and sufficient to trigger the perfectly timed and orchestrated death of 131 preordained cells during development. The relevance of this pathway to higher animals was established by the discovery of apparent mammalian orthologs of these genes and the demonstration that the mammalian Ced-3-related genes encode proteases (designated caspases) whose activities are responsible for the morphological changes characteristic of apoptosis (for review, see Hengartner 2000). The complexity of the apoptotic program began to increase with the discovery of Bcl-2, a gene whose product causes resistance to apoptosis in lymphocytes (Vaux et al. 1988; McDonnell et al. 1989). Bcl-2 was shown to correct partially the phenotype of a C. elegans mutation in Ced-9, a cell survival gene that functions upstream of Ced-4 and Ced-3 (Vaux et al. 1992). This finding suggested an apparent one-for-one correlation between the C. elegans and mammalian proand antiapoptotic pathways. However, this correlation did not explain two observations made in mammalian cells. First, the Bcl-2 protein was found on the membrane of mitochondria, which were not implicated in C. elegans apoptosis; and second, apoptotic changes could be produced in Xenopus laevis oocyte extracts only when a membrane fraction enriched in mitochondria was present (Hockenberry et al. 1990; Newmeyer et al. 1994). The complex role of mitochondria in mammalian cell apoptosis came into focus when biochemical studies identified several mitochondrial proteins that are able to activate cellular apoptotic programs directly (Liu et al. 1996; Susin et al. 1999; Du et al. 2000; Verhagen et al. 2000; Li et al. 2001). Normally, these proteins reside in the intermembrane space of mitochondria. In response to a variety of apoptotic stimuli, they are released to the cytosol and/or the nucleus. They promote apoptosis either by activating caspases and nucleases or by neutralizing cytosolic inhibitors of this process. A complex picture has emerged in which mitochondrial and cytosolic proapoptotic proteins interact with antiapoptotic proteins with each cell’s life or death hanging in the balance. This review summarizes the recent data on the expanding and complex role of mitochondria in apoptosis." @default.
• W2126376871 created "2016-06-24" @default.
• W2126376871 creator A5040205022 @default.
• W2126376871 date "2001-11-15" @default.
• W2126376871 modified "2023-10-06" @default.
• W2126376871 title "The expanding role of mitochondria in apoptosis." @default.
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