SOCS3 regulates graft-versus-host disease

Area of Science:

• Immunology
• Hematology
• Transplantation Biology

Background:

• Suppressor of cytokine signaling-3 (SOCS3) regulates granulocyte colony-stimulating factor signaling.
• Graft-versus-host disease (GVHD) is a major complication of allogeneic stem cell transplantation (SCT).

Purpose of the Study:

• To investigate the role of SOCS3 in regulating GVHD after SCT.
• To determine the specific cell lineages in which SOCS3 deficiency impacts GVHD.

Main Methods:

• Utilized genetically modified donor mice with SOCS3 deficiency restricted to specific hematopoietic compartments (hematopoietic, myeloid, T-cell).
• Assessed GVHD induction, mortality, and histopathology following allogeneic SCT.
• Analyzed T-cell proliferation and cytokine production (IL-10, IL-17, IFNγ).

Main Results:

• SOCS3 deficiency in donor T cells (SOCS3(-/Deltalck)) significantly augmented acute GVHD mortality and gastrointestinal histopathology.
• SOCS3-deficient T cells exhibited enhanced alloantigen-dependent proliferation and increased production of IL-10, IL-17, and IFNγ.
• IFNγ was critical for the enhanced GVHD induced by SOCS3-deficient T cells, while IL-10 and IL-17 were not.
• SOCS3-deficient T cells also induced severe sclerodermatous (chronic) GVHD dependent on TGF-β and IFNγ.

Conclusions:

• SOCS3 deficiency in donor T cells is a key driver of both acute and chronic GVHD.
• Targeting SOCS3, potentially with small molecule mimetics, could be a therapeutic strategy for inhibiting GVHD after SCT.