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HIV persistence in lymph nodes.

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Summary
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Despite antiretroviral therapy, human immunodeficiency virus (HIV) persists in lymphoid tissues. T follicular helper cells within lymph nodes are particularly enriched with replication-competent HIV, highlighting a key reservoir for persistence.

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • HIV establishes persistent reservoirs in various body compartments, including blood, CNS, and lymphoid tissues, despite antiretroviral therapy.
  • Within lymph nodes (LNs), T follicular helper (Tfh) cells residing in B cell follicles show a higher enrichment of replication-competent HIV compared to extra-follicular CD4 T cells.

Purpose of the Study:

  • To review and focus on the potential mechanisms contributing to HIV persistence within the lymph node microenvironment.

Main Methods:

  • Review of existing human and animal studies on HIV reservoirs.
  • Analysis of factors influencing HIV-infected cell fate within lymph nodes.

Main Results:

  • HIV persistence in LNs is influenced by a complex interplay of factors.
  • These factors include T cell activation levels, antiretroviral drug penetration, immune surveillance mechanisms (cytolytic/regulatory cells), and intrinsic cell properties like survival and proliferation.

Conclusions:

  • Understanding these LN-specific mechanisms is crucial for developing strategies to eradicate HIV reservoirs.
  • Combinatorial therapies targeting multiple viral reservoirs are necessary for achieving a cure for HIV infection.