title: Differential expression of proteinase inhibitor-9 and granzyme B mRNAs in activated immunocompetent cells.
abstract: The role of proteinase inhibitor (PI)-9 in hematopoietic cells remains unclear. To clarify the role of PI-9 in these cells, we compared the expressions of PI-9 mRNA and antigen with those of granzyme B (GrB). While the strongest expression of PI-9 mRNA was observed in a NK cell line YT-N10, it was also expressed in a B-acute lymphoblastic leukemia cell line U-Tree02, an Epstein-Barr Virus (EBV)-transformed B cell clone, a CD8+ T lymphocyte clone and a megakaryocytic cell line CMK, but not in a T cell line Jurkat. Phorbol 12-myristate 13 acetate (PMA) enhanced PI-9 mRNA expression in the CD8+ T lymphocyte clone and YT-N10 cells prior to GrB mRNA expression. IL-2 and IL-12 also had similar effects. PMA increased PI-9 mRNA expression in the EBV-transformed B cell clone and CMK cells, but IL-6 showed no effect. No changes were noted in PI-9 and GrB antigens after the addition of these agonists. Patients with graft-versus-host disease (GVHD) may have activated CTLs and NK cells. We therefore examined the expression of PI-9 and GrB mRNAs in eight patients after allogeneic hematopoietic stem cell transplantation with GVHD (n = 4) or without chronic GVHD (n = 4). Expression of GrB mRNA was significantly increased in three patients with GVHD and one patient without GVHD. Surprisingly, PI-9 mRNA expression was decreased in the eight patients. These results indicate that earlier synthesis of PI-9 may be essential for the prevention of autolysis of immunocompetent cells, and that the expression of PI-9 and GrB mRNAs may be controlled through different pathways.
authors.affiliation: Department of Medical Technology, Faculty of Health Sciences, Kobe University School of Medicine, Suma, Kobe 654-0142, Japan. horie@ams.kobe-u.ac.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Horie
authors.forename: Katsuyasu
authors.initials: K
authors.lastname: Saigo
authors.forename: Tohru
authors.initials: T
authors.lastname: Murayama
authors.forename: Ryukichi
authors.initials: R
authors.lastname: Ryo
mesh_terms: D002478:Cells, Cultured; D005786:Gene Expression Regulation / Q000187:drug effects; D053804:Granzymes; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D007378:Interleukins / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000187:drug effects / Q000235:genetics*; D008214:Lymphocytes / Q000187:drug effects / Q000201:enzymology / Q000276:immunology* / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012697:Serine Endopeptidases / Q000235:genetics*; D015843:Serpins / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014184:Transplantation, Homologous
chemical_list: D007378:Interleukins; D012333:RNA, Messenger; D015843:Serpins; C509213:GZMB protein, human; D053804:Granzymes; D012697:Serine Endopeptidases; D013755:Tetradecanoylphorbol Acetate