4
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      Human immunodeficiency virus reactivation by phorbol esters or T-cell receptor ligation requires both PKCalpha and PKCtheta.

      Journal of Biology

      Cells, Cultured, HIV-1, physiology, Humans, Isoenzymes, metabolism, Jurkat Cells, Phorbol Esters, pharmacology, Protein Kinase C, Protein Kinase C-alpha, Receptors, Antigen, T-Cell, Virus Activation, Virus Latency

      Read this article at

      ScienceOpenPublisherPMC
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Latently human immunodeficiency virus (HIV)-infected memory CD4(+) T cells represent the major obstacle to eradicating HIV from infected patients. Antigens, T-cell receptor (TCR) ligation, and phorbol esters can reactivate HIV from latency in a protein kinase C (PKC)-dependent manner; however, it is unknown which specific PKC isoforms are required for this effect. We demonstrate that constitutively active (CA) forms of both PKCtheta, PKCthetaA148E, and PKCalpha, PKCalphaA25E, induce HIV long terminal repeat (LTR)-dependent transcription in Jurkat and primary human CD4(+) T cells and that both PKCthetaA148E and PKCalphaA25E cause HIV reactivation in J1.1 T cells. Suppression of both PKCalpha and PKCtheta with short hairpinned (sh) RNA inhibited CD3/CD28-induced HIV LTR-dependent transcription and HIV reactivation in J1.1 T cells. Both prostratin and phorbol myristate 13-acetate induced HIV LTR-dependent transcription and HIV reactivation in J1.1 T cells that was blocked by shRNA against either PKCalpha or PKCtheta. Since suppression of PKCalpha and PKCtheta together has no greater inhibitory effect on HIV reactivation than inhibition of PKCalpha alone, our data confirm that PKCalpha and PKCtheta act in sequence. The requirement for PKCalpha and PKCtheta for prostratin-induced HIV reactivation and the ability of selective PKCalpha or PKCtheta agonists to induce HIV transcription indicate that these PKC isoforms are important targets for therapeutic drug design.

          Related collections

          Author and article information

          Journal
          16014943
          1181554
          10.1128/JVI.79.15.9821-9830.2005

          Comments

          Comment on this article