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Hypoxic microenvironment shapes HIV-1 replication and latency.

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Hypoxia inducible factors (HIFs) restrict human immunodeficiency virus (HIV) transcription by binding to the viral promoter. Inhibiting HIFs can reverse hypoxia-induced suppression of HIV reactivation, impacting latency-reversing strategies.

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Area of Science:

  • Virology
  • Cellular Biology
  • Immunology

Background:

  • Viral replication is influenced by the cellular microenvironment, particularly oxygen levels.
  • Hypoxia inducible factors (HIFs) regulate cellular responses to low oxygen.
  • Human immunodeficiency virus (HIV) infected cells in lymphoid tissues often reside in hypoxic conditions, yet studies typically use normoxic lab settings where HIFs are inactive.

Purpose of the Study:

  • To investigate the role of HIF-2α in HIV transcription and replication under hypoxic conditions.
  • To determine if HIF signaling affects the reactivation of latent HIV.
  • To explore the implications of hypoxia on the efficacy of latency-reversing agents.

Main Methods:

  • Studied HIV replication and latency in hypoxic vs. normoxic conditions.
  • Investigated the binding of HIF-2α to the HIV promoter.
  • Assessed the impact of hypoxia and HIF inhibition on HIV reactivation induced by TNF or Romidepsin.

Main Results:

  • HIF-2α was found to restrict HIV transcription through direct binding to the viral promoter.
  • Hypoxia reduced the reactivation of HIV mediated by tumor necrosis factor or Romidepsin.
  • Inhibiting HIF signaling pathways reversed the hypoxia-mediated suppression of HIV reactivation.

Conclusions:

  • The low-oxygen environment in lymph nodes may suppress HIV replication and promote latency.
  • A mechanism involving HIF-2α contributes to the limited efficacy of latency-reversing agents in reactivating HIV.
  • Targeting HIF signaling pathways may offer new strategies for controlling latent HIV-1 infection.