title: Childhood polyclonal T cell lymphocytosis with neutropenia: effects of antilymphocyte globulin and granulocyte colony stimulating factor in vitro and in vivo.
abstract: The pathogenesis of the neutropenia that occurs in some patients with chronic T cell lymphocytosis is not well understood. We have investigated a 15-year-old girl with this syndrome. Initial committed bone marrow progenitor numbers (CFUgm) were low but markedly increased in vitro following T cell depletion. Similarly a transient correction of neutropenia was observed following in vivo lymphocyte depletion with antilymphocyte globulin. A sustained neutrophil recovery was achieved with daily therapy using recombinant human granulocyte colony stimulating factor (rhG-CSF) despite persistence of the lymphocytosis; during successful therapy CFUgm numbers remained low, and were not increased by the in vitro addition of rhG-CSF. These observations suggest the possibility of an inhibitory regulatory mechanism specifically acting on neutrophil granulopoiesis.
authors.affiliation: Department of Cellular and Molecular Sciences, St George's Hospital Medical School, London.
authors.forename: A S
authors.initials: AS
authors.lastname: Laurie
authors.forename: F M
authors.initials: FM
authors.lastname: Gibson
authors.forename: K M
authors.initials: KM
authors.lastname: Josten
authors.forename: P J
authors.initials: PJ
authors.lastname: Talbot
authors.forename: T R
authors.initials: TR
authors.lastname: Rutherford
authors.forename: J S
authors.initials: JS
authors.lastname: Lilleyman
authors.forename: E C
authors.initials: EC
authors.lastname: Gordon-Smith
mesh_terms: D000293:Adolescent; D000961:Antilymphocyte Serum / Q000627:therapeutic use*; D001853:Bone Marrow / Q000473:pathology; D002478:Cells, Cultured; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000627:therapeutic use*; D006412:Hematopoietic Stem Cells / Q000187:drug effects; D006801:Humans; D066298:In Vitro Techniques; D008218:Lymphocytosis / Q000150:complications* / Q000276:immunology; D009503:Neutropenia / Q000209:etiology / Q000628:therapy*; D011994:Recombinant Proteins / Q000627:therapeutic use; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000961:Antilymphocyte Serum; D011994:Recombinant Proteins; D016179:Granulocyte Colony-Stimulating Factor