title: Nonclassical major histocompatibility complex I-like Fc neonatal receptor (FcRn) expression in neonatal human tissues.
abstract: The neonatal Fc receptor (FcRn) was demonstrated to play a role both in the recycling and thus the protection of immunoglobulin G (IgG) from catabolism and in the maternal-fetal transfer of IgG. The expression of this particular receptor was evidenced in a variety of cell types, but the endothelial cell was considered the main cell able to perform both recycling and IgG catabolism. Based on preliminary data obtained in adult human mammary glands and skin, this study focused on a number of neonatal human tissues, targeting FcRn expression mainly in epithelial versus endothelial cells. Our results demonstrate that in most of the investigated tissues, the neonatal Fc receptor is not detectable in the endothelial cells lining the capillaries, whereas most epithelial cells are positive. We could also observe the receptor's expression in most macrophages, smooth muscle cells, and neurons. Taken together, these data suggest that the main sites of IgG catabolism might in fact be other than endothelial cells in human neonates.
authors: Department of Immunology, Gr T Popa University of Medicine and Pharmacy, and Laboratory of Immunology and Genetics, Sf. Spiridon Hospital, Iasi, Romania.
authors: Corina
authors: C
authors: Cianga
authors: Petru
authors: P
authors: Cianga
authors: Petru
authors: P
authors: Plamadeala
authors: Cornelia
authors: C
authors: Amalinei
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D000906:Antibodies / Q000032:analysis / Q000276:immunology; D002102:Cadaver; D004847:Epithelial Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D005260:Female; D015870:Gene Expression / Q000276:immunology*; D015395:Histocompatibility Antigens Class I / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D007113:Immunity, Innate; D007074:Immunoglobulin G / Q000276:immunology* / Q000378:metabolism; D007150:Immunohistochemistry; D007231:Infant, Newborn; D008264:Macrophages / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D008969:Molecular Sequence Data; D032389:Myocytes, Smooth Muscle / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D009928:Organ Specificity; D010455:Peptides / Q000737:chemistry / Q000276:immunology; D011961:Receptors, Fc / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D057900:Transcytosis
chemical_list: D000906:Antibodies; D015395:Histocompatibility Antigens Class I; D007074:Immunoglobulin G; D010455:Peptides; D011961:Receptors, Fc; C100688:Fc receptor, neonatal