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Inhibiting IL-2 signaling and the regulatory T-cell pathway using computationally designed peptides.

Tammy Price-Troska1, Zhi-Zhang Yang2, David Diller3,4

  • 1Division of Hematology, Department of Medicine, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA.

Investigational New Drugs
|April 27, 2018
PubMed
Summary

Researchers designed peptides to block interleukin-2 (IL-2) receptor alpha (sIL-2Rα) binding, inhibiting regulatory T cell development. This approach shows promise for treating B-cell non-Hodgkin lymphoma (NHL).

Keywords:
Computationally designed peptidesFoxp3STAT5Soluble IL-2RaTreg cells

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Area of Science:

  • Immunology
  • Computational Biology
  • Oncology

Background:

  • Elevated soluble interleukin-2 (IL-2) receptor alpha (sIL-2Rα) levels correlate with poor prognosis in B-cell non-Hodgkin lymphoma (NHL).
  • sIL-2Rα binding to IL-2 promotes regulatory T (Treg) cell induction by upregulating Foxp3 expression.

Purpose of the Study:

  • To design novel peptides that inhibit the IL-2/sIL-2Rα interaction.
  • To suppress Foxp3 induction and reduce Treg cell numbers for potential therapeutic applications in NHL.

Main Methods:

  • Structure-based computational design was employed to create peptides targeting the IL-2/sIL-2Rα binding interface.
  • Enzyme-linked immunosorbent assay (ELISA) was used to screen 22 designed peptides for inhibitory activity.
  • A lead peptide, CMD178, was selected for further validation of its effects on IL-2/sIL-2Rα signaling pathways.

Main Results:

  • Ten of 22 designed peptides demonstrated varying capacities to inhibit IL-2/sIL-2Rα binding.
  • The lead peptide, CMD178, effectively reduced IL-2/sIL-2Rα-induced expression of Foxp3 and STAT5.
  • CMD178 pretreatment preserved cytokine (IL-2/IFN-γ) and granule (perforin/granzyme B) production in CD8+ T cells during co-culture.

Conclusions:

  • Structure-based peptide design is a viable strategy for developing inhibitors of IL-2/sIL-2Rα signaling.
  • Identified peptides, such as CMD178, can effectively inhibit Treg cell development.
  • These novel peptides hold therapeutic potential for B-cell NHL and other malignancies.