Megakaryocytopoiesis in vitro of patients with essential thrombocythaemia: effect of plasma and serum on megakaryocyte colony formation

Norio Komatsu, Toshio Suda, Yoichi Sakata, Mitsuoki Eguchi, Kazuhiko Kaji, Masaki Saito, Yasusada Miura

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Summary. TO clarify the mechanism of increased numbers of megakaryocytes in patients with essential thrombocythaemia (ET), we studied in vitro megakaryocytopoiesis in ET and other myeloproliferative disorders, using a megakaryocyte colony assay in methylcellulose containing plasma or serum and medium conditioned by phytohaemagglutinin (PHA) stimulated leucocytes (PHA‐LCM). Megakaryocytic colony formation was supported well by heparinized or citrated plasma and citrated serum which was harvested after clot formation of citrated plasma. Whole serum was inhibitory for megakaryocytic colony growth. The addition of platelet releasates and partially purified platelet derived growth factor (PDGF) resulted in a decrease in the number of megakaryocytic colonies. These findings suggested that platelet‐derived factor(s) in serum was inhibitory to megakaryocytic colony formation. ET plasma supported the megakaryocytic colony formation by normal or ET bone marrow cells better than normal plasma. Moreover, in ET bone marrow cells, spontaneous megakaryocytic colonies were formed in the absence of PHA‐LCM. Increased megakaryocytopoiesis in ET may be ascribed to (i) increased megakaryocyte‐colony stimulating activity (Meg‐CSA) in plasma and (ii) increased sensitivity to Meg‐CSA or autonomous proliferation of megakaryocytic progenitor cells.

Original languageEnglish
Pages (from-to)241-252
Number of pages12
JournalBritish Journal of Haematology
Volume64
Issue number2
DOIs
Publication statusPublished - 1986 Oct

ASJC Scopus subject areas

  • Hematology

Fingerprint Dive into the research topics of 'Megakaryocytopoiesis in vitro of patients with essential thrombocythaemia: effect of plasma and serum on megakaryocyte colony formation'. Together they form a unique fingerprint.

  • Cite this