Thrombopoietin suppresses apoptosis and behaves as a survival factor for the human growth factor-dependent cell line, M07e

Alec Ritchie, Saroj Vadhan-Raj, Hal E. Broxmeyer

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Thrombopoietin (TPO) has been demonstrated to have proliferative effects on hematopoietic progenitor cells and maturational effects on more committed populations which express a megakaryocyte lineage-specific phenotype. M07e is a GM-CSF or interleukin 3 (IL-3)-dependent human leukemic cell line having surface markers characteristic of both myeloid progenitors and megakaryocytes. The effects of TPO on the proliferation and survival of M07e cells were investigated. Following an 18-h factor starvation period to remove residual growth factor signals and phase the cells in G0/G1, TPO provides a weak proliferative signal to M07e compared to IL-3 or GM-CSF treatment under the same conditions. However, TPO synergizes with both GM-CSF and IL-3, and to a greater extent with steel factor, a competence factor for M07e, in the induction of cellular proliferation. TPO sustains cellular integrity of M07e during prolonged (18 days) growth factor withdrawal and also protects M07e cells in serum-free conditions. In addition, preincubation of M07e for 72 h in TPO maintains its survival for subsequent cytokine-induced proliferation, while control media do not. TPO suppresses growth factor withdrawal-induced apoptosis as evaluated by flow cytometric detection of both in situ terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling and cellular DNA content via propidium iodide staining. These results suggest a role for TPO as a survival factor for M07e cells.

Original languageEnglish (US)
Pages (from-to)330-336
Number of pages7
JournalSTEM CELLS
Volume14
Issue number3
DOIs
StatePublished - Jan 1 1996

Keywords

  • Apoptosis
  • Growth factors
  • M07e
  • Survival factors
  • Thrombopoietin

ASJC Scopus subject areas

  • Cell Biology

Fingerprint Dive into the research topics of 'Thrombopoietin suppresses apoptosis and behaves as a survival factor for the human growth factor-dependent cell line, M07e'. Together they form a unique fingerprint.

  • Cite this