Accommodation and antibodies.

Area of Science:

• Transplantation immunology
• Graft survival mechanisms

Background:

• Organ transplantation faces challenges from immune rejection, particularly antibody-mediated injury.
• Understanding mechanisms that promote graft acceptance, known as accommodation, is crucial for improving transplant outcomes.

Purpose of the Study:

• To define the key features and underlying mechanisms of organ transplant accommodation.
• To elucidate the host and graft modifications associated with successful graft function despite anti-transplant antibodies.

Main Methods:

• Review of existing literature on transplant immunology and accommodation.
• Analysis of molecular and immunological factors reported in studies of accommodation.

Main Results:

• Accommodation is characterized by resistance to immune-mediated injury despite circulating anti-transplant antibodies.
• Key features include prior depletion of anti-graft antibodies, their delayed return, graft expression of protective genes, a recipient Th2 immune response, and complement membrane attack complex inhibition.

Conclusions:

• Accommodation represents a critical state of immune tolerance in organ transplantation.
• These findings highlight potential therapeutic targets to promote graft survival and prevent rejection.