PMID- 32635423 OWN - NLM STAT- MEDLINE DCOM- 20210218 LR - 20210218 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 21 IP - 13 DP - 2020 Jul 4 TI - Role of Human Leukocyte Antigens at the Feto-Maternal Interface in Normal and Pathological Pregnancy: An Update. LID - 10.3390/ijms21134756 [doi] LID - 4756 AB - The successful maternal tolerance of the semi-allogeneic fetus provides an apparent immunologic paradox. Indeed, deep invasion of placental trophoblast cells into maternal uterine tissue and the following growth of the fetus have to be tolerated by a pregnant woman's immune system. Among the various possible protective mechanisms that may be involved in human pregnancy, the expression of a non-classical pattern of human leukocyte antigen (HLA) class I molecules and the complete lack of expression of HLA class II molecules in placental tissues seem to be the most relevant mechanisms of fetal escape from maternal immune recognition. The importance of HLA molecules in fetal toleration by the maternal immune system is highlighted by pregnancy complications occurring in cases of abnormal HLA molecule expression at the maternal-fetal interface. In this review, we summarize evidences about the role of placental HLA molecules in normal and pathological pregnancies. FAU - Tersigni, Chiara AU - Tersigni C AUID- ORCID: 0000-0003-1590-3942 AD - Dipartimento di Scienze della Salute della Donna, del Bambino e di Sanita Pubblica, U.O.C. di Ostetricia e Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy. FAU - Meli, Federica AU - Meli F AD - Facolta di Medicina e Chirurgia A. A Gemelli, Universita Cattolica del Sacro Cuore, 00168 Rome, Italy. FAU - Neri, Caterina AU - Neri C AD - Dipartimento di Scienze della Salute della Donna, del Bambino e di Sanita Pubblica, U.O.C. di Ostetricia e Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy. FAU - Iacoangeli, Azzurra AU - Iacoangeli A AD - Facolta di Medicina e Chirurgia A. A Gemelli, Universita Cattolica del Sacro Cuore, 00168 Rome, Italy. FAU - Franco, Rita AU - Franco R AD - Facolta di Medicina e Chirurgia A. A Gemelli, Universita Cattolica del Sacro Cuore, 00168 Rome, Italy. FAU - Lanzone, Antonio AU - Lanzone A AD - Dipartimento di Scienze della Salute della Donna, del Bambino e di Sanita Pubblica, U.O.C. di Ostetricia e Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy. AD - Facolta di Medicina e Chirurgia A. A Gemelli, Universita Cattolica del Sacro Cuore, 00168 Rome, Italy. FAU - Scambia, Giovanni AU - Scambia G AD - Facolta di Medicina e Chirurgia A. A Gemelli, Universita Cattolica del Sacro Cuore, 00168 Rome, Italy. AD - Dipartimento di Scienze della Salute della Donna, del Bambino e di Sanita Pubblica, U.O.C. di Ginecologia Oncologica, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy. FAU - Di Simone, Nicoletta AU - Di Simone N AD - Dipartimento di Scienze della Salute della Donna, del Bambino e di Sanita Pubblica, U.O.C. di Ostetricia e Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy. AD - Facolta di Medicina e Chirurgia A. A Gemelli, Universita Cattolica del Sacro Cuore, 00168 Rome, Italy. LA - eng PT - Journal Article PT - Review DEP - 20200704 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0 (HLA Antigens) SB - IM MH - Animals MH - Female MH - Fetus/*immunology MH - HLA Antigens/*immunology MH - Humans MH - Immune Tolerance/immunology MH - Maternal-Fetal Exchange/*immunology MH - Placenta/immunology MH - Pregnancy MH - Trophoblasts/immunology PMC - PMC7370064 OTO - NOTNLM OT - Human Leukocyte Antigen (HLA) OT - Major Histocompatibility Complex (MHC) OT - maternal-fetal interface OT - pre-eclampsia. OT - pregnancy OT - syncytiotrophoblast COIS- The authors declare no conflict of interest. EDAT- 2020/07/09 06:00 MHDA- 2021/02/20 06:00 PMCR- 2020/07/01 CRDT- 2020/07/09 06:00 PHST- 2020/05/08 00:00 [received] PHST- 2020/06/24 00:00 [revised] PHST- 2020/07/02 00:00 [accepted] PHST- 2020/07/09 06:00 [entrez] PHST- 2020/07/09 06:00 [pubmed] PHST- 2021/02/20 06:00 [medline] PHST- 2020/07/01 00:00 [pmc-release] AID - ijms21134756 [pii] AID - ijms-21-04756 [pii] AID - 10.3390/ijms21134756 [doi] PST - epublish SO - Int J Mol Sci. 2020 Jul 4;21(13):4756. doi: 10.3390/ijms21134756.