title: Transforming growth factor-beta1 (TGF-beta1) induces thrombopoietin from bone marrow stromal cells, which stimulates the expression of TGF-beta receptor on megakaryocytes and, in turn, renders them susceptible to suppression by TGF-beta itself with high specificity.
abstract: The present study was designed to test the concept that platelets release a humoral factor that plays a regulatory role in megakaryopoiesis. The results showed that, among various hematoregulatory cytokines examined, transforming growth factor-beta1 (TGF-beta1) was by far the most potent enhancer of mRNA expression of bone marrow stromal thrombopoietin (TPO), a commitment of lineage specificity. The TPO, in turn, induced TGF-beta receptors I and II on megakaryoblasts at the midmegakaryopoietic stage; at this stage, TGF-beta1 was able to arrest the maturation of megakaryocyte colony-forming units (CFU-Meg). This effect was relatively specific when compared with its effect on burst-forming unit-erythroid (BFU-E) or colony-forming unit-granulocyte-macrophage (CFU-GM). In patients with idiopathic thrombocytopenic purpura (ITP), the levels of both TGF-beta1 and stromal TPO mRNA were correlatively increased and an arrest of megakaryocyte maturation was observed. These in vivo findings are in accord with the aforementioned in vitro results. Thus, the results of the present investigation suggest that TGF-beta1 is one of the pathophysiological feedback regulators of megakaryopoiesis.
authors.affiliation: 4th Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Sakamaki
authors.forename: Y
authors.initials: Y
authors.lastname: Hirayama
authors.forename: T
authors.initials: T
authors.lastname: Matsunaga
authors.forename: H
authors.initials: H
authors.lastname: Kuroda
authors.forename: T
authors.initials: T
authors.lastname: Kusakabe
authors.forename: T
authors.initials: T
authors.lastname: Akiyama
authors.forename: Y
authors.initials: Y
authors.lastname: Konuma
authors.forename: K
authors.initials: K
authors.lastname: Sasaki
authors.forename: N
authors.initials: N
authors.lastname: Tsuji
authors.forename: T
authors.initials: T
authors.lastname: Okamoto
authors.forename: M
authors.initials: M
authors.lastname: Kobune
authors.forename: K
authors.initials: K
authors.lastname: Kogawa
authors.forename: J
authors.initials: J
authors.lastname: Kato
authors.forename: R
authors.initials: R
authors.lastname: Takimoto
authors.forename: R
authors.initials: R
authors.lastname: Koyama
authors.forename: Y
authors.initials: Y
authors.lastname: Niitsu
mesh_terms: D001853:Bone Marrow / Q000473:pathology*; D003114:Colony-Forming Units Assay; D004921:Erythropoietin / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D006410:Hematopoiesis; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D015850:Interleukin-6 / Q000494:pharmacology; D008533:Megakaryocytes / Q000166:cytology / Q000473:pathology / Q000502:physiology*; D008954:Models, Biological; D011696:Purpura, Thrombocytopenic / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics; D011994:Recombinant Proteins / Q000494:pharmacology; D012016:Reference Values; D017154:Stromal Cells / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D013926:Thrombopoietin / Q000096:biosynthesis / Q000235:genetics*; D014158:Transcription, Genetic; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D007377:Interleukin-3; D015850:Interleukin-6; D012333:RNA, Messenger; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; D014409:Tumor Necrosis Factor-alpha; D004921:Erythropoietin; D016179:Granulocyte Colony-Stimulating Factor; D013926:Thrombopoietin