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Complement-Opsonized HIV-1 Overcomes Restriction in Dendritic Cells.

Wilfried Posch1, Marion Steger1, Ulla Knackmuss1

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Summary

Complement opsonization enables HIV-1 to infect dendritic cells (DCs) by bypassing SAMHD1 restriction. This enhances DC immune functions, offering a potential new strategy against HIV infection.

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Dendritic cells (DCs) possess intrinsic defenses limiting HIV-1 replication, making them largely non-permissive to infection.
  • This DC non-permissiveness is thought to contribute to HIV-1 evasion strategies.
  • Understanding DC-HIV interactions is crucial for developing effective antiviral therapies.

Purpose of the Study:

  • To investigate how complement-opsonized HIV-1 (HIV-C) infects DCs.
  • To elucidate the role of SAMHD1 restriction and its modulation in HIV-C infected DCs.
  • To assess the impact of HIV-C infection on DC maturation and immune function.

Main Methods:

  • Utilizing complement-opsonized HIV-1 (HIV-C) and single-cycle HIV-C for infection studies.
  • Assessing SAMHD1 restriction, phosphorylation (T592), and degradation in infected DCs.
  • Employing a CDK2-inhibitor to block SAMHD1 phosphorylation.
  • Evaluating DC maturation, co-stimulatory potential, and type I interferon responses.

Main Results:

  • Complement-opsonized HIV-1 (HIV-C) efficiently infects DCs, including BDCA-1 DCs, by bypassing SAMHD1 restriction.
  • HIV-C infection leads to elevated SAMHD1 T592 phosphorylation, not degradation.
  • Blocking SAMHD1 phosphorylation with a CDK2-inhibitor abrogates HIV-C-induced DC infection.
  • HIV-C treated DCs exhibit enhanced maturation, co-stimulatory capacity, aberrant type I interferon signaling, and stronger cellular immune responses.

Conclusions:

  • Complement opsonization represents a novel mechanism for HIV-1 to overcome DC intrinsic defenses, specifically SAMHD1 restriction.
  • HIV-C infection enhances DC immune functions, including maturation and immune response induction.
  • These findings suggest a potential therapeutic strategy leveraging complement opsonization to boost DC-mediated immunity against HIV infection.