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Mammalian mothers and their embryos/fetuses are almost invariably genetically different, which raises the question of how the mother's immune system is diverted so as to permit cohabitation with the 'foreign' body. Several decades of research have shown that multiple cooperative systems sanction uteroplacental immune privilege. These systems include production of several varieties of soluble immunosuppressive molecules in the uterus and the placenta and strict regulation of the molecules expressed on or by placental trophoblast cells. Trophoblast, a unique lineage without counterpart in adult tissues, is in direct contact with maternal blood and tissue. The major graft rejection-promoting molecules, human leukocyte antigens (HLAs), are tightly regulated in these cells, with none of HLA-A, HLA-B, or HLA class II antigens expressed. The HLA class Ib antigens, HLA-E, HLA-F, and HLA-G, are detectable on some subpopulations. Our studies have focused on the expression, regulation, and functions of the soluble isoforms of HLA-G, which circulate in maternal blood and are present at high levels in the pregnant uterus. These isoforms are derived from the single HLA-G gene by alternative splicing and are now known to have immunosuppressive properties. Ours and other studies indicate that soluble HLA-G proteins may comprise a unique tolerogenic system for establishing local immune privilege during pregnancy.
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http://dx.doi.org/10.1111/j.1600-065X.2006.00436.x | DOI Listing |
Front Immunol
March 2025
Shanxi Bethune Hospital Cancer Center Lymphoma Department, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, China.
Primary large B-cell lymphoma of immune-privileged sites (IP-LBCL) encompasses a spectrum of relatively rare aggressive B-cell lymphomas, such as primary central nervous system lymphoma (PCNSL), primary testicular large B-cell lymphoma (PTL), and primary vitreoretinal large B-cell lymphoma (PVRL). Macroscopically, the development of IPI-LBCL may be associated with the dysfunction of meningeal lymphatic vessels (mLVs) and the perivascular channel system formed by astrocytes. Microscopically, mutation in MYD88 and CD79B genes plays a pivotal role in the pathogenesis of IP-LBCL.
View Article and Find Full Text PDFInt J Mol Sci
March 2025
School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China.
Low-dose ionizing radiation (LDIR) is a prevalent environmental factor with profound impacts on male reproductive health, particularly on the testicular immune microenvironment. This review examines the multifaceted effects of LDIR, emphasizing its ability to induce genotoxic stress, oxidative damage, and epigenetic modifications in reproductive cells. These alterations compromise DNA repair, disrupt chromatin structure, and induce immune dysregulation.
View Article and Find Full Text PDFiScience
March 2025
Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA.
Brain endothelial cells (BECs) play an important role in maintaining central nervous system (CNS) homeostasis through blood-brain barrier (BBB) functions. BECs express low baseline levels of adhesion receptors, which limits entry of leukocytes. However, the molecular mediators governing this phenotype remain mostly unclear.
View Article and Find Full Text PDFAngiogenesis
March 2025
Department of Plastic, Reconstructive and Aesthetic Surgery, Cedars Sinai Hospital, Los Angeles, USA.
Cord blood-derived endothelial colony-forming cells (CB-ECFCs) hold significant promise for regenerative medicine due to their unique vasculogenic and immunomodulatory properties. These cells exhibit a superior proliferative capacity, robust ability to form vascular networks, and lower immunogenicity compared to adult and embryonic stem cell-derived counterparts. The immune-privileged characteristics of CB-ECFCs, including reduced expression of pro-inflammatory mediators and tolerance-inducing molecules such as HLA-G, further enhance their therapeutic potential.
View Article and Find Full Text PDFMed Res Rev
March 2025
Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan.
The use of photoswitchable ligand to control the protein functionalities and related downstream effects in an on-off manner is an active research area in photopharmacology and medicinal chemistry. Temporal control grants a privilege to identify the crucial role of a particular receptor in biological occurrences without destroying the protein permanently. Additionally, light can be applied site-selectively to regulate protein functionality with cellular and sub-cellular levels of spatial resolutions.
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