title: Flow cytometric analysis of infiltrating cells in the peripheral nerves in experimental allergic neuritis.
abstract: Experimental autoimmune neuritis (EAN) is an animal model that shares clinical, pathological and electrophysiological features with the human disease Guillain-Barré syndrome (GBS). In this study, we isolated and characterized by fluorescent activated cell sorter (FACS) phenotype of the inflammatory cells infiltrating cauda equina (CE) of Lewis rats at the active stage of the disease. We found that at this stage of EAN macrophages (Mphi) and alphabeta T cells were two major populations isolated from CE. We also found that among total cell population isolated from CE, gammadelta T and NK cells composed two small but distinct populations, while B cells were negligible. We characterized phenotype of alphabeta T cells in CE as CD45RC(+)CD8(+) (activated cytotoxic lymphocytes) and CD45RC(-)CD4(+) (memory Th cells). The phenotype of gammadelta T cells was found to be consisted of only CD45RC(+)CD8(+) cells. Both alphabeta and gammadelta T cells in CE expressed a higher level of CD25, CD44 and CD54 activation markers compared to the other tissues. Immunohistochemistry demonstrated that gammadelta T cells existed apart from the intense cellular infiltrate. This is the first report on the isolation and FACS analysis of CE-infiltrating cells, contributing a new and alternative approach to study the inflammatory lesions in EAN. We conclude that both alphabeta and gammadelta T cells have a unique activation/inflammatory phenotype required to traffic through and be retained in the peripheral nerves during EAN.
authors.affiliation: Department of Neurology, University of Pennsylvania School of Medicine, 3400 Spruce Street, Philadelphia, PA 19104-4283, USA.
authors.forename: T
authors.initials: T
authors.lastname: Fujioka
authors.forename: E
authors.initials: E
authors.lastname: Purev
authors.forename: S G
authors.initials: SG
authors.lastname: Kremlev
authors.forename: E S
authors.initials: ES
authors.lastname: Ventura
authors.forename: A
authors.initials: A
authors.lastname: Rostami
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D002420:Cauda Equina / Q000276:immunology; D002634:Chemotaxis, Leukocyte; D005260:Female; D005434:Flow Cytometry; D018960:Hyaluronan Receptors / Q000032:analysis; D007150:Immunohistochemistry; D007156:Immunologic Memory / Q000276:immunology; D018799:Intercellular Adhesion Molecule-1 / Q000032:analysis; D007694:Killer Cells, Natural / Q000276:immunology; D008213:Lymphocyte Activation; D008264:Macrophages / Q000276:immunology; D008297:Male; D009444:Neuritis, Autoimmune, Experimental / Q000276:immunology* / Q000473:pathology*; D010525:Peripheral Nerves / Q000276:immunology* / Q000473:pathology*; D051381:Rats; D011917:Rats, Inbred Lew; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000032:analysis; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000032:analysis; D015375:Receptors, Interleukin-2 / Q000032:analysis; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D018960:Hyaluronan Receptors; D016693:Receptors, Antigen, T-Cell, alpha-beta; D016692:Receptors, Antigen, T-Cell, gamma-delta; D015375:Receptors, Interleukin-2; D018799:Intercellular Adhesion Molecule-1