IL-21 is critical for GVHD in a mouse model

Area of Science:

• Immunology
• Transplantation immunology
• Cellular immunology

Background:

• Interleukin-21 (IL-21) is known to affect T, B, and natural killer (NK) cells.
• The specific role of IL-21 in graft-versus-host disease (GVHD) is not well understood.

Purpose of the Study:

• To investigate the role of IL-21 in the pathogenesis of GVHD.
• To explore the potential of blocking IL-21 signaling as a strategy for GVHD prophylaxis.

Main Methods:

• Bone marrow transplantation (BMT) was performed using splenocytes from IL-21 receptor knockout (IL-21R(-/-)) mice and wild-type mice.
• A decoy receptor for IL-21 was generated and used to transduce bone marrow (BM) cells for BMT.

Main Results:

• Morbidity and mortality associated with GVHD were significantly reduced when using splenocytes from IL-21R(-/-) mice compared to wild-type mice.
• Mice receiving BM cells transduced with the IL-21 decoy receptor exhibited less severe GVHD compared to control groups.

Conclusions:

• IL-21 plays a critical role in regulating GVHD.
• Blocking the IL-21 signaling pathway presents a promising novel strategy for the prophylaxis of GVHD.