Immunomorphologic studies of human decidua-associated lymphoid cells in normal early pregnancy

• Published in: The Journal of immunology (1950) Vol. 152; no. 4; pp. 2020 - 2032
• Main Authors: Mincheva-Nilsson, L, Baranov, V, Yeung, MM, Hammarstrom, S, Hammarstrom, ML
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Am Assoc Immnol 15.02.1994; American Association of Immunologists
• Subjects: Antigens, CD - analysis; Antigens, Differentiation, T-Lymphocyte - analysis; Biological and medical sciences; CD4 Antigens - analysis; CD56 Antigen; CD8 Antigens - analysis; Decidua - cytology; Decidua - immunology; Decidua - ultrastructure; Female; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Histocompatibility Antigens Class I - analysis; HLA Antigens - analysis; HLA-G Antigens; Humans; Immunobiology; Immunophenotyping; Leukocyte Common Antigens - analysis; Lymphocytes - immunology; Lymphocytes - ultrastructure; Lymphoid cells: ontogeny, maturation, markers, receptors, circulation and recirculation; Pregnancy; Pregnancy Trimester, First; Receptors, Antigen, T-Cell, gamma-delta - analysis; Human; Immunohistochemistry; T cell receptor; Decidua; Cell subpopulation; Characterization; Natural killer cell; Pregnancy; Uterus; Ultrastructure; T-Lymphocyte; Epithelial cell; Immunoelectron microscopy; Lymphocyte
• ISSN: 0022-1767; 1550-6606; 1550-6606
• DOI: 10.4049/jimmunol.152.4.2020

Human decidual lymphocytes from early, normal pregnancy were characterized in situ with respect to ultrastructure and distribution of subsets. The ultrastructure of isolated decidual gamma delta T cells was also studied. CD45+ cells comprised 11 +/- 2% of all decidual cells. The majority were localized in large lymphoid cell clusters (LCC), near endometrial glands, or as intraepithelial lymphocytes (IEL) in glandular epithelium. The major cell populations in LCC were CD56+TCR-gamma delta+ cells, CD56+ cells, TCR-alpha beta+CD4+ cells, and TCR-alpha beta+CD8+ cells. All expressed activation markers (CD45RO, Kp43, and/or HML-1) and MHC class II Ag (HLA-DR, HLA-DP, and/or HLA-DQ). No B cells were found. Almost all IEL were activated TCR-gamma delta+ cells (CD56+ and CD56-). The glandular epithelial cells expressed heat shock protein 60 at the basolateral side facing the TCR-gamma delta+ IEL. Decidual lymphocytes displayed cytoplasmic processes, microvilli, characteristic cytoplasmic granules, and had intimate contact with neighboring cells. Lymphocytes in the outer rim of LCC and the stroma showed signs of cellular movement. Two main morphotypes of gamma delta T cells could be distinguished. One had single microvilli, membrane-bound granules, and nuclear inclusions. The other had many microvilli, nonmembrane-bound granules and cytoplasmic multivesicular bodies. Our data suggest that LCC are centers of immune reactivity where T and NK cells become activated. The activated cells may guard against infections and undue trophoblast invasion and/or be involved in modulating the local maternal immune system toward unresponsiveness against the semiallogeneic fetus.