Immunoregulatory activity of supernatants from shortterm cultures of mouse decidual tissue

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Abstract
Supernatants from short-term in -vitro cultures of decidual tissue, obtained from the uteri of pregnant mice from Days 4 to 13 post coitum (Day 1 = day of mating), were assessed for immunoregulatory activity by their addition to a mixed lymphocyte reaction (MLR), an in-vitro analog of the afferent arm of the immune response. All culture supernatants tested possessed inhibitory activity in the MLR, although the extent of inhibition was affected by seeding density, length of culture, and the day of pregnancy from which decidual tissue was obtained. Inhibitory activity produced by decidual cultures increased from Day 4 to reach a maximum on Day 8, and then declined to Day 11. Two morphologically distinct cell types were present in all decidual cultures; flat dendritic cells, considered to represent decidual cells, and small round cells, but whether immunoregulatory factors are associated with both is uncertain. Decidual tissue could fulfill a role in the local partial blockade of the afferent arm of the maternal immune response during pregnancy.