Abstract
Placental trophoblast cells of the semi-allogenic human conceptus invade deeply into maternal uterine tissue. From a classical immunoiogic point of view this invasion and the following growth and development of the fetus in the uterus have to be tolerated by a pregnant woman's immune system. Among the various possible protective mechanisms that may be involved, the unique expression pattern of HLA class I molecules seems to be relevant. Besides many other differences between placentation and organ transplantation, this extraordinary HLA class I expression on trophoblast explains why pregnancy should not be considered an immunologic paradox but rather a fascinating example of a very special challenge for the female immune system.
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