title: Langerhans cell deficiency in reticular dysgenesis.
abstract: Reticular dysgenesis is a rare inherited immunodeficiency characterized by the lack of blood monocytes and neutrophils and low lymphocyte counts, contrasting with normal red blood cell counts and normal or decreased platelet counts. Whether dendritic cells or macrophages, both of which derive primarily from blood monocytes, are affected in this condition remains unknown. We studied 7 patients with reticular dysgenesis. Macrophages were present in normal numbers in the dermis and in the atrophic lymphoid tissues of these patients, proving that at least some subsets of macrophages can differentiate despite very low monocyte counts. By contrast, Langerhans cells, which are CD1a-positive epidermal dendritic cells, were absent in all (n = 5) patients before bone marrow transplantation. After bone marrow transplantation, Langerhans cells were present (n = 2), suggesting that the defect is not related to keratinocyte dysfunction. A split chimeric reconstitution, characterized by the presence of autologous blood monocytes able to differentiate in vitro into CD1a-positive dendritic cells, was observed in a patient who underwent successful engraftment. These results suggest that an intrinsic cell defect is unlikely and that a bone marrow-derived factor may be defective in reticular dysgenesis; it may be responsible for the Langerhans cell defect but not involved in macrophage differentiation.
authors.affiliation: Service d'Anatomie Pathologique, Hôpital Paul Brousse, and UPRES 1596, Université Paris-Sud, Villejuif, France. francois.emile@pbr.ap-hop-paris.fr
authors.forename: J F
authors.initials: JF
authors.lastname: Emile
authors.forename: F
authors.initials: F
authors.lastname: Geissmann
authors.forename: O C
authors.initials: OC
authors.lastname: Martin
authors.forename: I
authors.initials: I
authors.lastname: Radford-Weiss
authors.forename: Y
authors.initials: Y
authors.lastname: Lepelletier
authors.forename: B
authors.initials: B
authors.lastname: Heymer
authors.forename: T
authors.initials: T
authors.lastname: Espanol
authors.forename: K B
authors.initials: KB
authors.lastname: de Santes
authors.forename: Y
authors.initials: Y
authors.lastname: Bertrand
authors.forename: N
authors.initials: N
authors.lastname: Brousse
authors.forename: J L
authors.initials: JL
authors.lastname: Casanova
authors.forename: A
authors.initials: A
authors.lastname: Fischer
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D001284:Atrophy; D016026:Bone Marrow Transplantation; D002454:Cell Differentiation; D002648:Child; D003713:Dendritic Cells / Q000276:immunology / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D007801:Langerhans Cells / Q000473:pathology*; D008221:Lymphoid Tissue / Q000473:pathology; D008264:Macrophages / Q000276:immunology / Q000473:pathology; D016511:Severe Combined Immunodeficiency / Q000276:immunology / Q000473:pathology* / Q000628:therapy; D012867:Skin / Q000473:pathology*; D000097382:CD68 Molecule
chemical_list: D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; C067980:CD68 antigen, human; D000097382:CD68 Molecule