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• W2024742441 endingPage "e29934" @default.
• W2024742441 startingPage "e29934" @default.
• W2024742441 abstract "We have previously shown that TPA activates HTLV-1 LTR in Jurkat T-cells by inducing the binding of Sp1-p53 complex to the Sp1 site residing within the Ets responsive region 1 (ERR-1) of the LTR and that this activation is inhibited by PKCalpha and PKCepsilon. However, in H9 T-cells TPA has been noted to activate the LTR in two consecutive stages. The first stage is activation is mediated by PKCetta and requires the three 21 bp TRE repeats. The second activation mode resembles that of Jurkat cells, except that it is inhibited by PKCdelta. The present study revealed that the first LTR activation in H9 cells resulted from PKCetta-induced elevation of non-phosphorylated c-Jun which bound to the AP-1 site residing within each TRE. In contrast, this TRE-dependent activation did not occur in Jurkat cells, since there was no elevation of non-phosphorylated c-Jun in these cells. However, we found that PKCalpha and PKCepsilon, in Jurkat cells, and PKCetta and PKCdelta, in H9 cells, increased the level of phosphorylated c-Jun that interacted with the Sp1-p53 complex. This interaction prevented the Sp1-p53 binding to ERR-1 and blocked, thereby, the ERR-1-mediated LTR activation. Therefore, this PKC-inhibited LTR activation started in both cell types after depletion of the relevant PKCs by their downregulation. In view of these variable activating mechanisms we assume that there might be additional undiscovered yet modes of HTLV-1 LTR activation which vary in different cell types. Moreover, in line with this presumption we speculate that in HTLV-1 carriers the LTR of the latent provirus may also be reactivated by different mechanisms that vary between its different host T-lymphocyte subclones. Since this reactivation may initiate the ATL process, understanding of these mechanisms is essential for establishing strategies to block the possibility of reactivating the latent virus as preventive means for ATL development in carriers." @default.
• W2024742441 created "2016-06-24" @default.
• W2024742441 creator A5004952042 @default.
• W2024742441 creator A5044423177 @default.
• W2024742441 creator A5049557390 @default.
• W2024742441 creator A5087590026 @default.
• W2024742441 creator A5088705114 @default.
• W2024742441 date "2012-01-27" @default.
• W2024742441 modified "2023-10-17" @default.
• W2024742441 title "Differential Role of PKC-Induced c-Jun in HTLV-1 LTR Activation by 12-O-Tetradecanoylphorbol-13-acetate in Different Human T-cell Lines" @default.
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• W2024742441 doi "https://doi.org/10.1371/journal.pone.0029934" @default.
• W2024742441 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3267723" @default.
• W2024742441 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22299029" @default.
• W2024742441 hasPublicationYear "2012" @default.

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