Major Histocompatibility Complex I Mediates Immunological Tolerance of the Trophoblast during Pregnancy and May Mediate Rejection during Parturition
Table 2
Leukocytes that have been found in the placenta during physiological pregnancy in humans, cows, and horses [29–33].
Humans
Cows
Horses
Leukocytes in placenta
Three major populations: (i) Uterine Natural Killer (uNK) cells (ii) Macrophages (iii) T lymphocytes Other less abundant leukocyte populations: (i) Dendritic cells (ii) Natural Killer T (NKT) (iii) Regulatory T cells
Endometrial macrophages (as much as half of all immune cells) Other less abundant leukocyte populations: (i) Dendritic cells (ii) T lymphocytes
Mostly T lymphocytes Other less abundant leukocyte populations: (i) B lymphocytes (ii) NK cells (iii) Eosinophils