title: Interleukin 7 as interleukin 9 drives phytohemagglutinin-activated T cells through several cell cycles; no synergism between interleukin 7, interleukin 9 and interleukin 4.
abstract: The effects of the interleukins IL-7 and IL-9 on cell cycle progression were investigated by conventional [3H]thymidine incorporation and by the bivariate BrdU/Hoechst technique. Both IL-7 and IL-9 drive phytohemagglutinin-activated T cells through more than one cell cycle, but IL-7 was more potent on cell cycle progression than IL-9. Neither synergistic nor inhibitory effects were seen between various combinations of the lymphokines IL-7, IL-9 and IL-4 compared to each lymphokine alone. When T cells are activated with phytohemagglutinin for 3 days, all or most IL-4 responsive cells respond to IL-7 as well, whereas only a part of IL-7 responders are IL-4 responders. In contrast, when T cells are activated with phytohemagglutinin for 7 days, the quantitative data of the cell cycle distribution suggest that the population of IL-7 responders is at least an overlapping, if not a real subset of the population of the IL-4 responders.
authors.affiliation: Department of Pediatrics, University of Würzburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Lehrnbecher
authors.forename: M
authors.initials: M
authors.lastname: Poot
authors.forename: K
authors.initials: K
authors.lastname: Orscheschek
authors.forename: W
authors.initials: W
authors.lastname: Sebald
authors.forename: A C
authors.initials: AC
authors.lastname: Feller
authors.forename: H
authors.initials: H
authors.lastname: Merz
mesh_terms: D002453:Cell Cycle / Q000187:drug effects*; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis; D004261:DNA Replication / Q000187:drug effects; D005434:Flow Cytometry / Q000379:methods; D006801:Humans; D015847:Interleukin-4 / Q000494:pharmacology*; D015851:Interleukin-7 / Q000494:pharmacology*; D016906:Interleukin-9 / Q000494:pharmacology*; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects / Q000502:physiology*; D010835:Phytohemagglutinins; D011994:Recombinant Proteins / Q000494:pharmacology; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors
chemical_list: D015851:Interleukin-7; D016906:Interleukin-9; D010835:Phytohemagglutinins; D011994:Recombinant Proteins; D015847:Interleukin-4; D004247:DNA; D013936:Thymidine