title: Characterization of granulocyte colony-stimulating factor receptor expressed on human lymphocytes.
abstract: We have studied the characterization of granulocyte colony-stimulating factor receptor (G-CSFR) in human lymphocytes. About one-third to one-quarter of the B lymphocytes from peripheral B-cell sources displayed G-CSF binding on the two-colour immunofluorescence study. The rate of G-CSFR-expressing (G-CSFR+) B cells was higher in bone marrow and cord blood than in peripheral blood, spleen and tonsil. G-CSFR expression was greater in the surface immunoglobulin D (IgD)-positive (sIgD+) B-cell population, but scarce in the sIgD- B-cell population. In tonsil, G-CSFR+ B cells were present among the cells with naive B and germinal-centre B phenotypes, but those with memory B phenotype were rarely found on triple-colour immunofluorescence analysis. Mitogen-activated, but not resting, T lymphocytes also showed G-CSF binding. Several continuous T- and B-cell lines expressed functional G-CSFR, because the addition of G-CSF enhanced the proliferative response of these cell lines. A sequence analysis of G-CSFR mRNA isoforms obtained from the T and B cells revealed that G-CSFR was derived from class I and class IV mRNA. Our results indicated that G-CSFR was constitutively expressed on the B-cell surface and was inducible in T cells.
authors.affiliation: Division of Clinical Nutrition, Department of Nutrition, Sagami Women's University, Sagamihara, Kanagawa, Japan. morikawa_keiko@isc.sagami-wu.ac.jp
authors.forename: Keiko
authors.initials: K
authors.lastname: Morikawa
authors.forename: Shigeru
authors.initials: S
authors.lastname: Morikawa
authors.forename: Masahiko
authors.initials: M
authors.lastname: Nakamura
authors.forename: Toshio
authors.initials: T
authors.lastname: Miyawaki
mesh_terms: D001402:B-Lymphocytes / Q000737:chemistry*; D001854:Bone Marrow Cells; D002460:Cell Line; D002648:Child; D005312:Fetal Blood; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D006801:Humans; D008213:Lymphocyte Activation; D014066:Palatine Tonsil; D011485:Protein Binding; D012333:RNA, Messenger / Q000032:analysis; D016188:Receptors, Granulocyte Colony-Stimulating Factor / Q000032:analysis* / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen; D013601:T-Lymphocytes / Q000737:chemistry*
chemical_list: D012333:RNA, Messenger; D016188:Receptors, Granulocyte Colony-Stimulating Factor; D016179:Granulocyte Colony-Stimulating Factor