Human immunodeficiency virus-restricted replication in astrocytes and the ability of gamma interferon to modulate this restriction are regulated by a downstream effector of the Wnt signaling pathway

Deborah Carroll-Anzinger, Anvita Kumar, Vyacheslav Adarichev, Fatah Kashanchi, Lena Al-Harthi

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Astrocyte dysregulation correlates with the severity and the rate of human immunodeficiency virus (HIV)-associated dementia (HAD) progression, highlighting a pivotal role for astrocytes in HIV neuropathogenesis. Yet, astrocytes limit HIV, indicating that they posses an intrinsic molecular mechanism to restrict HIV replication. We previously established that this restriction can be partly overcome by priming astrocytes with gamma interferon (IFN-γ), which is elevated in the cerebral spinal fluid of HAD patients. We evaluated the mechanism of restrictive HIV replication in astrocytes and how IFN-γ priming modulates this restriction. We demonstrate that the downstream effector of Wnt signaling, T-cell factor 4 (TCF-4), is part of a transcriptional complex that is immunoprecipitated with HIV TAR-containing region in untreated astrocytes but not in IFN-γ-treated cells. Blocking TCF-4 activity with a dominant-negative mutant enhanced HTV replication by threefold in both the astrocytoma cell line U87MG and primary fetal astrocytes. Using a TCF-4 reporter plasmid, we directly demonstrate that Wnt signaling is active in human astrocytes and is markedly reduced by IFN-γ treatment. Collectively, these data implicate TCF-4 in repressing HIV replication and the ability of IFN-γ to regulate this restriction by inhibiting TCF-4. Given that TCF-4 is the downstream effector of Wnt signaling, harnessing Wnt signaling as an intrinsic molecular mechanism to limit HIV replication may emerge as a powerful tool to regulate HTV replication within and outside of the brain.

Original languageEnglish
Pages (from-to)5864-5871
Number of pages8
JournalJournal of Virology
Volume81
Issue number11
DOIs
Publication statusPublished - Jun 2007

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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