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Protein stabilization improves STAT3 function in autosomal dominant hyper-IgE syndrome.

Claire E Bocchini1, Karen Nahmod1, Panagiotis Katsonis2

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Summary

Most Autosomal dominant hyper-IgE syndrome (AD-HIES) mutations destabilize STAT3 protein. Agents that enhance chaperone protein function can restore STAT3 stability and activity, offering a potential new treatment for AD-HIES.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Autosomal dominant hyper-IgE syndrome (AD-HIES) is linked to STAT3 mutations, but the molecular mechanisms of dysfunction and effective treatments are lacking.
  • Current management for AD-HIES is primarily supportive, highlighting the need for targeted therapeutic strategies.

Purpose of the Study:

  • To investigate the impact of AD-HIES-associated STAT3 mutations on protein stability.
  • To explore the potential of chaperone protein modulators to restore STAT3 stability and function in AD-HIES.

Main Methods:

  • Computer modeling was used to predict the destabilizing effects of STAT3 mutations.
  • STAT3 protein half-life, phosphorylation levels (pY-STAT3), and target gene expression were measured in cells with and without chaperone modulators (HSF1A, GGA).
  • Effects were assessed in Epstein-Barr virus-transformed B (EBV) cells, human peripheral blood mononuclear cells (PBMCs), and mouse splenocytes.

Main Results:

  • Computer modeling indicated that 81% of AD-HIES mutations are destabilizing.
  • AD-HIES patient cells with destabilizing STAT3 mutations exhibited significantly reduced STAT3 protein half-life.
  • Treatment with HSF1A or GGA normalized STAT3 half-life, increased pY-STAT3 levels, and enhanced STAT3 target gene expression in EBV cells.
  • Chaperone modulator treatment also improved cytokine-activated pY-STAT3 in human T cells and increased IL-17-producing cells in mice.

Conclusions:

  • The majority of STAT3 mutations causing AD-HIES lead to protein destabilization.
  • Chaperone protein modulators show promise in improving STAT3 stability and activity, suggesting a potential therapeutic avenue for AD-HIES.