Designed transcription activator-like effector proteins efficiently induced the expression of latent HIV-1 in latently infected cells

AIDS Res Hum Retroviruses. 2015 Jan;31(1):98-106. doi: 10.1089/AID.2014.0121.

Abstract

HIV latency is the foremost barrier to clearing HIV infection from patients. Reactivation of latent HIV-1 represents a promising strategy to deplete these viral reservoirs. Here, we report a novel approach to reactivate latent HIV-1 provirus using artificially designed transcription activator-like effector (TALE) fusion proteins containing a DNA-binding domain specifically targeting the HIV-1 promoter and the herpes simplex virus-based transcriptional activator VP64 domain. We engineered four TALE genes (TALE1-4) encoding TALE proteins, each specifically targeting different 20-bp DNA sequences within the HIV-1 promoter, and we constructed four TALE-VP64 expression vectors corresponding to TALE1-4. We found that TALE1-VP64 effectively reactivated HIV-1 gene expression in latently infected C11 and A10.6 cells. We further confirmed that TALE1-VP64 reactivated latent HIV-1 via specific binding to the HIV-LTR promoter. Moreover, we also found that TALE1-VP64 did not affect cell proliferation or cell cycle distribution. Taken together, our data demonstrated that TALE1-VP64 can specifically and effectively reactivate latent HIV-1 transcription, suggesting that this strategy may provide a novel approach for anti-HIV-1 latency therapy in the future.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Cell Cycle / drug effects
  • Cell Line
  • Cell Proliferation / drug effects
  • DNA-Binding Proteins / metabolism
  • Green Fluorescent Proteins / biosynthesis
  • Green Fluorescent Proteins / genetics
  • HIV Infections / genetics
  • HIV Infections / virology
  • HIV Long Terminal Repeat / genetics
  • HIV-1 / genetics*
  • Humans
  • Leukocytes, Mononuclear / virology
  • Molecular Sequence Data
  • Promoter Regions, Genetic
  • Recombinant Fusion Proteins / pharmacology*
  • Simplexvirus / genetics
  • Transcriptional Activation / drug effects*
  • Virus Activation / genetics*
  • Virus Latency / genetics*
  • Virus Replication / genetics

Substances

  • DNA-Binding Proteins
  • Recombinant Fusion Proteins
  • Green Fluorescent Proteins