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• W2072358081 abstract "Toxoplasma gondii-infected cells are resistant to various apoptotic stimuli, however, the role of the pro-apoptotic BH3-only Bad protein in T. gondii-imposed inhibition of host cell apoptosis in connection with the phosphoinositide 3-kinase (PI3K)-PKB/Akt pathway was not well delineated. Here, we investigated the signaling patterns of Bad, Bax and PKB/Akt in T. gondii-infected and uninfected THP-1 cells treated with staurosporine (STS) or PI3K inhibitors. STS treatment, without T. gondii infection, reduced the viability of THP-1 cells in proportion to STS concentration and triggered many cellular death events such as caspase-3 and -9 activation, Bax translocation, cytochrome c release from host cell mitochondria into cytosol, and PARP cleavage in the host cell. However, T. gondii infection eliminated the STS-triggered mitochondrial apoptotic events described above. Additionally, T. gondii infection in vitro and in vivo induced the phosphorylation of PKB/Akt and Bad in a parasite-load-dependent manner which subsequently inhibited Bax translocation. The PI3K inhibitors, LY294002 and Wortmannin, both blocked parasite-induced phosphorylation of PKB/Akt and Bad. Furthermore, THP-1 cells pretreated with these PI3K inhibitors showed reduced phosphorylation of Bad in a dose-dependent manner and subsequently failed to inhibit the Bax translocation, also these cells also failed to overcome the T. gondii-imposed inhibition of host cell apoptosis. These data demonstrate that the PI3K-PKB/Akt pathway may be one of the major route for T. gondii in the prevention of host cell apoptosis and T. gondii phosphorylates the pro-apoptotic Bad protein to prevent apoptosis." @default.
• W2072358081 created "2016-06-24" @default.
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• W2072358081 date "2013-04-01" @default.
• W2072358081 modified "2023-10-11" @default.
• W2072358081 title "Involvement of PI 3 kinase/Akt-dependent Bad phosphorylation in Toxoplasma gondii-mediated inhibition of host cell apoptosis" @default.
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• W2072358081 doi "https://doi.org/10.1016/j.exppara.2013.01.005" @default.
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