vFLIP upregulates IKKε leading to spindle morphology formation through RelA activation

Zunlin Yang, Tomoyuki Honda, Keiji Ueda

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Kaposi's sarcoma (KS)-associated herpesvirus (KSHV) vFLIP, a latent gene of KSHV, was first identified as a FLICE-inhibitory protein (FLIP) protecting cells from apoptosis. The vFLIP protein has been shown to activate the NF-κB signaling involved in spindle morphology formation both in HUVECs infected with KSHV and Kaposi's sarcoma (KS) itself. In this study, we independently established stably vFLIP-expressing cells and showed that they exhibited upregulated NF-κB family protein expression independent of the ability of IKKs to bind vFLIP. Further, vFLIP induced upregulation of IKKε phosphorylation of RelA at Ser468 (p-RelA S468) and nuclear localization of Re1A concomitant with spindle morphology formation, and these effects were reversed by knockdown of IKKε and treatment with Bay-11. Overexpression of IKKε alone also showed spindle morphology formation with p-RelA S468. In conclusion, the spindle cell morphology in KS should be induced by RelA activation (p-RelA S468) by IKKε upregulation in vFLIP-expressing EA hy926 cells.

Original languageEnglish
Pages (from-to)106-121
Number of pages16
Publication statusPublished - Sept 2018
Externally publishedYes


  • IKKε
  • NF-κBs
  • p-RelA S468
  • RelA
  • Spindle morphology

ASJC Scopus subject areas

  • Virology


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