Graft microvascular disease in solid organ transplantation

Area of Science:

• Transplantation immunology
• Vascular biology
• Organ rejection

Background:

• Alloimmune inflammation causes microvascular damage in solid organ transplants during acute rejection.
• Current immunosuppressants reduce inflammation but do not repair damaged vasculature.
• Persistent microvascular injury leads to hypoxia, fibrosis, and chronic rejection.

Purpose of the Study:

• To review the critical role of the microvasculature in long-term solid organ transplant survival.
• To highlight therapeutic strategies focused on microvessels for preventing chronic rejection.

Main Methods:

• Review of recent scientific literature on microvascular injury and repair in transplantation.
• Analysis of clinical and preclinical studies investigating microvascular perfusion and fibrosis.
• Synthesis of findings on the link between microvascular health and transplant outcomes.

Main Results:

• Microvascular damage is a key factor in acute and chronic organ transplant rejection.
• Loss of microcirculation precedes and initiates chronic rejection.
• Enhanced microvascular perfusion during acute rejection attenuates fibrosis and delays chronic rejection.

Conclusions:

• Preserving a functional microvasculature is a promising therapeutic strategy to prevent chronic rejection.
• Microvessel-centered approaches may significantly improve long-term solid organ transplant survival.