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- W2016206412 abstract "Abstract Over the past decade, parathyroid hormone‐related protein (PTHrP) has been identified as a key survival factor for cells subjected to apoptotic stimuli. Its anti‐apoptotic activity has been attributed to nuclear accumulation of the intact protein, or a synthetic peptide corresponding to its nuclear targeting sequence (NTS), which promotes rapid exit of nutrient deprived cells from the cell cycle. Intracellular PTHrP also inhibited apoptosis by blocking tumor necrosis factor alpha (TNFα)‐induced apoptosis by blocking signaling from the “death receptor” and preventing damage to the mitochondrial membrane. In both cases, the anti‐apoptotic activity was significantly reduced in the presence of a nuclear deficient form of PTHrP with a 88 K/E K/E·K/I 91 mutation in the NTS. The current work was undertaken to determine the mechanism by which nuclear PTHrP blocked mitochondrial‐mediated apoptosis. Using sub‐cellular fractionation and functional assays we showed that pre‐treatment of HEK293 cells with exogenous NTS peptide before inducing apoptosis with TNFα was as effective as expression of the full‐length protein in inhibiting apoptosis. Inhibition of apoptosis was associated with increased expression of protein kinase casein kinase 2 (CK2) and in sustained CK2 accumulation and activity in the nuclear fraction. In primary chondrogenic cells harvested from the limb buds of PTHrP +/− and PTHrP −/− embryonic mice, there was a dose‐dependent decrease in CK2 expression and activity that correlated with increased susceptibility to apoptosis. Taken together the results indicate that nuclear accumulation of PTHrP effectively inhibits mitochondrial‐mediated apoptosis through regulation of the expression, activity, and sub‐cellular trafficking of CK2. J. Cell. Physiol. 212:591–599, 2007. © 2007 Wiley‐Liss, Inc." @default.
- W2016206412 created "2016-06-24" @default.
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- W2016206412 date "2007-04-18" @default.
- W2016206412 modified "2023-10-13" @default.
- W2016206412 title "Parathyroid hormone-related protein (PTHrP) inhibits mitochondrial-dependent apoptosis through CK2" @default.
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- W2016206412 doi "https://doi.org/10.1002/jcp.21055" @default.
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