Vascularized composite allotransplantation versus solid organ transplantation: innate-adaptive immune interphase

Area of Science:

• Immunobiology
• Transplantation Science

Background:

• Vascularized composite allotransplantation (VCA) offers life-enhancing solutions for complex tissue defects, building on solid organ transplantation (SOT) principles.
• Innate and adaptive immunity are central concerns in both VCA and SOT, with divergent immunobiological responses observed in recipients.

Purpose of the Study:

• To review and highlight the divergent immunobiology responses in VCA and SOT recipients.
• To investigate the impact of ischemia-reperfusion injury (IRI) on VCA outcomes and immune rejection.
• To explore novel therapeutic strategies for VCA based on SOT advancements.

Main Methods:

• Comparative review of immune responses in VCA and SOT.
• Analysis of the role of innate immune activation in IRI.
• Examination of cell-mediated and antibody-mediated rejection mechanisms.

Main Results:

• Host innate immune activation drives peritransplant IRI, impacting VCA and SOT.
• Cell-mediated rejection is more frequent in VCA than SOT due to the immunogenicity of skin grafts.
• Ex-vivo perfusion may offer cytoprotection against IRI; topical or cell-based therapies may reduce systemic immunosuppression in VCA.

Conclusions:

• Further understanding of innate-adaptive immune crosstalk is essential for developing novel VCA therapies.
• Strategies established in SOT can inform VCA treatment advancements.
• Investigating IRI's influence on humoral immune rejection in VCA and SOT is needed.