title: Endoglin (CD 105) expression in human lymphoid organs and placenta.
abstract: Endoglin (CD 105) is a cell surface antigen widely expressed on vascular endothelium, syncytiotrophoblast, some tissue macrophages, certain culture cells (including early leukemic B-lineage) and some endothelial cell lines. Though its relation to the transforming growth factor-beta (TGF-beta) receptor system is well documented, its function and detailed pattern of expression still remain to be clarified. We examined the differential tissue distribution of endoglin in human lymphoid organs and placenta with several anti-CD 105 monoclonal antibodies (mAbs) using an indirect immunoperoxidase technique, and performed semi-quantitative measurements using an image-analyzing system for comparison. Arterial, venous and capillary endothelia in these organs were reactive with anti-CD 105 mAbs at varying intensities. Interestingly, a distinctly stronger staining pattern was observed in the high endothelial venules (HEVs) which may indicate a special role for endoglin in lymphocyte trafficking. Syncytiotrophoblast expressed endoglin strongly on their apical cell membrane. Extravillous trophoblasts at certain locations selectively expressed endoglin on their cell membranes, suggesting a special role for this surface antigen during trophoblast differentiation.
authors.affiliation: Hacettepe University Medical Faculty, Histology and Embryology Department, Ankara, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Dağdeviren
authors.forename: S F
authors.initials: SF
authors.lastname: Müftüoğlu
authors.forename: A N
authors.initials: AN
authors.lastname: Cakar
authors.forename: U
authors.initials: U
authors.lastname: Ors
mesh_terms: D000911:Antibodies, Monoclonal; D015703:Antigens, CD / Q000032:analysis* / Q000096:biosynthesis; D002196:Capillaries / Q000166:cytology; D002454:Cell Differentiation; D002462:Cell Membrane / Q000378:metabolism / Q000648:ultrastructure; D002648:Child; D002675:Child, Preschool; D000071063:Endoglin; D004730:Endothelium, Vascular / Q000166:cytology / Q000276:immunology*; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D008198:Lymph Nodes / Q000098:blood supply; D008221:Lymphoid Tissue / Q000098:blood supply*; D014066:Palatine Tonsil / Q000098:blood supply; D010920:Placenta / Q000098:blood supply*; D011247:Pregnancy; D011956:Receptors, Cell Surface; D013154:Spleen / Q000098:blood supply; D013950:Thymus Gland / Q000098:blood supply; D014327:Trophoblasts / Q000166:cytology / Q000502:physiology; D019010:Vascular Cell Adhesion Molecule-1 / Q000032:analysis* / Q000096:biosynthesis; D014699:Venules / Q000166:cytology
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; C064206:ENG protein, human; D000071063:Endoglin; D011956:Receptors, Cell Surface; D019010:Vascular Cell Adhesion Molecule-1