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HPV caught in the tetraspanin web?

Jérôme Finke1, Lisa Hitschler2, Klaus Boller3

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Human papillomavirus (HPV) infection may utilize tetraspanin-rich membrane structures as entry platforms. These large, actin-decorated aggregates facilitate virus internalization into host cells.

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Area of Science:

  • Cell biology
  • Virology
  • Membrane biology

Background:

  • Tetraspanins organize cell membranes and are implicated in viral entry.
  • Virus particles may induce tetraspanin aggregation and co-internalization.

Purpose of the Study:

  • To investigate the structure and formation of human papillomavirus (HPV) type 16-induced tetraspanin aggregates on keratinocyte cell surfaces.
  • To explore the potential role of cytoskeletal proteins in this process.

Main Methods:

  • Microscopy was used to study tetraspanin aggregates in keratinocytes overexpressing tetraspanins.
  • Association of obscurin-like protein 1 (OBSL1) with filamentous actin was examined in non-overexpressing cells.

Main Results:

  • HPV-induced aggregates were rich in multiple tetraspanins and formed 3D structures.
  • These aggregates were decorated intracellularly by filamentous actin.
  • OBSL1 associated with filamentous actin in cells not overexpressing tetraspanins.

Conclusions:

  • HPV may trigger the formation of a tetraspanin web, acting as a virus entry platform.
  • This web could link viral particles to intracellular actin machinery, potentially involving OBSL1.
  • The tetraspanin web facilitates co-internalization of the virus.