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RIP1 kinase activity is critical for skin inflammation but not for viral propagation

Joshua D Webster1, Youngsu C Kwon2, Summer Park2

  • 1Departments of Pathology, Genentech, South San Francisco, California, USA.

Journal of Leukocyte Biology
|January 28, 2020
PubMed

Insights

Receptor interacting protein kinase 1 (RIP1) inhibition effectively treats skin inflammation. However, RIP1 does not impact aging male testicular health or responses to specific viral infections.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Receptor interacting protein kinase 1 (RIP1) is a key regulator of inflammatory responses and cell death pathways, including apoptosis and necroptosis.
  • RIP1 kinase activity is implicated in inflammatory, neurodegenerative, and oncogenic diseases.

Purpose of the Study:

  • To investigate the therapeutic potential of RIP1 kinase inhibition in inflammatory conditions.
  • To evaluate the role of RIP1, RIP3, and MLKL in testicular aging and viral infection responses.

Main Methods:

  • Utilized the RIP1 kinase inhibitor GNE684 in Sharpin mutant (Cpdm) mice to assess skin inflammation and liver immune cell infiltration.
  • Examined the effects of genetic inactivation of RIP1 (RIP1 KD), RIP3 (RIP3 KO), and MLKL (MLKL KO) on testicular pathology in aging male mice.
  • Assessed viral clearance following vaccinia virus and mouse gammaherpesvirus MHV68 infections in wild-type, RIP1 KD, and RIP3 KO mice.

Main Results:

  • RIP1 inhibition with GNE684 effectively reduced skin inflammation and immune cell infiltrates in Cpdm mice.
  • Genetic inactivation of RIP1, RIP3, or MLKL did not alter testicular pathology in aging male mice.
  • Viral clearance was comparable across wild-type, RIP1 KD, and RIP3 KO mice infected with vaccinia virus or MHV68.

Conclusions:

  • RIP1 inhibition demonstrates therapeutic benefits for skin inflammation.
  • RIP1 signaling is not essential for testicular aging or the host response to the studied viral infections.
Keywords:
MLKLRIP1RIP3RIPK1RIPK3caspase

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