title: Suppression of hematopoiesis by activated T-cells in infectious mononucleosis associated with pancytopenia.
abstract: Two patients with primary Epstein-Barr virus (EBV) infection followed by pancytopenia were studied. They showed increased numbers of DR-positive, activated T-cells and serological evidence of persistent EBV infection over a 12 and 18 week period. Bone marrow granulocyte-macrophage colony formation (CFU-GM) was investigated by limiting dilution assay (LDA) and methylcellulose assay. CFU-GM of bone marrow mononuclear cells (BMMNC) was markedly suppressed in both patients during the pancytopenic phase. Removal of bone marrow T-cells by E-rosetting resulted in a significant increase of CFU-GM to normal levels in BMMNC of both patients, while no significant increase was observed in the BMMNC of normal subjects. CFU-GM in BMMNC from Patient 1 in the recovery phase was normal when DR-positive T-cells were within normal levels, irrespective of the presence or absence of T-cells. These results suggest that pancytopenia due to infectious mononucleosis in these patients was due to bone marrow suppression by activated T-cells. In vitro studies with Con A activated T-cells and their culture medium showed that suppression of CFU-GM by T-cells was mediated by a lymphokine.
authors.affiliation: First Department of Internal Medicine, School of Medicine, University of Tokushima, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Iishi
authors.forename: M
authors.initials: M
authors.lastname: Kosaka
authors.forename: T
authors.initials: T
authors.lastname: Mizuguchi
authors.forename: K
authors.initials: K
authors.lastname: Toyota
authors.forename: Y
authors.initials: Y
authors.lastname: Takaue
authors.forename: Y
authors.initials: Y
authors.lastname: Kawano
authors.forename: S
authors.initials: S
authors.lastname: Saito
mesh_terms: D000328:Adult; D005260:Female; D006410:Hematopoiesis / Q000502:physiology*; D006801:Humans; D007244:Infectious Mononucleosis / Q000150:complications / Q000503:physiopathology*; D008213:Lymphocyte Activation / Q000502:physiology*; D008297:Male; D010198:Pancytopenia / Q000209:etiology / Q000503:physiopathology*; D013601:T-Lymphocytes / Q000502:physiology*