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The viral transactivator of the pX region (Tax) is important for initiating malignant transformation, and deregulation of the major signaling pathway nuclear factor of kappa B (NF-\u03baB) by Tax represents a hallmark of HTLV-1 driven cancer.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Here we found that Tax mutants which are defective in NF-\u03baB signaling showed diminished protein expression levels compared to Tax wildtype in T-cells, whereas<jats:italic>Tax<\/jats:italic>transcript levels were comparable. Strikingly, constant activation of NF-\u03baB signaling by the constitutive active mutant of<jats:italic>inhibitor of kappa B kinase<\/jats:italic>(IKK2, IKK-\u03b2), IKK2-EE, rescued protein expression of the NF-\u03baB defective Tax mutants M22 and K1-10R and even increased protein levels of Tax wildtype in various T-cell lines while<jats:italic>Tax<\/jats:italic>transcript levels were only slightly affected. Using several Tax expression constructs, an increase of Tax protein occurred independent of<jats:italic>Tax<\/jats:italic>transcripts and independent of the promoter used. Further, Tax and M22 protein expression were strongly enhanced by 12-O-Tetradecanoylphorbol-13-Acetate [TPA; Phorbol 12-myristate 13-acetate (PMA)]\/ ionomycin, inducers of NF-\u03baB and cytokine signaling, but not by tumor necrosis factor alpha (TNF-\u03b1). On the other hand, co-expression of Tax with a dominant negative inhibitor of \u03baB, I\u03baB\u03b1-DN, or specific inhibition of IKK2 by the compound ACHP, led to a vast decrease in Tax protein levels to some extent independent of<jats:italic>Tax<\/jats:italic>transcripts in transiently transfected and Tax-transformed T-cells. Cycloheximide chase experiments revealed that co-expression of IKK2-EE prolongs the half-life of M22, and constant repression of NF-\u03baB signaling by I\u03baB\u03b1-DN strongly reduces protein stability of Tax wildtype suggesting that NF-\u03baB activity is required for Tax protein stability. Finally, protein expression of Tax and M22 could be recovered by NH<jats:sub>4<\/jats:sub>Cl and PYR-41, inhibitors of the lysosome and the ubiquitin-activating enzyme E1, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Together, these findings suggest that Tax\u2019s capability to induce NF-\u03baB is critical for protein expression and stabilization of Tax itself. Overall, identification of this novel positive feedback loop between Tax and NF-\u03baB in T-cells improves our understanding of Tax-driven transformation.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12977-020-00538-w","type":"journal-article","created":{"date-parts":[[2020,9,10]],"date-time":"2020-09-10T07:03:46Z","timestamp":1599721426000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["A novel positive feedback-loop between the HTLV-1 oncoprotein Tax and NF-\u03baB activity in T-cells"],"prefix":"10.1186","volume":"17","author":[{"given":"Sebastian","family":"Millen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lina","family":"Meretuk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tim","family":"G\u00f6ttlicher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Schmitt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernhard","family":"Fleckenstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8568-9526","authenticated-orcid":false,"given":"Andrea K.","family":"Thoma-Kress","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,9,10]]},"reference":[{"key":"538_CR1","doi-asserted-by":"crossref","first-page":"388","DOI":"10.3389\/fmicb.2012.00388","volume":"3","author":"A Gessain","year":"2012","unstructured":"Gessain A, Cassar O. 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