Pluripotential hematopoietic stem cells in post-5-fluorouracil murine bone marrow express the Thy-1 antigen

D. E. Williams, H. S. Boswell, A. D. Floyd, H. E. Broxmeyer

Research output: Contribution to journalArticle

20 Scopus citations


Expression of the Thy-1 alloantigen by hematopoietic stem and progenitor cells in post-5-fluorouracil (5-FU) murine bone marrow was investigated. FACS analysis of BDF1 bone marrow stained for Thy-1.2 with a triple-layer amplified labeling technique demonstrated that 35% of the total bone marrow population expressed Thy-1.2 (Thy-1.2+). Two distinct size subpopulations were observed in post-5-FU BDF1 marrow. Thy-1.2+ cells were present in both the large and the small subpopulations. FACS-separated bone marrow cells were also plated in methylcellulose cultures. Ninety percent of all colony-forming cells surviving in vivo administration of 5-FU were Thy-1.2+. Replating of primary hemopoietic colonies and morphologic examination of primary and secondary colonies demonstrated that the most primitive stem cells including 'stem' (S) cells were Thy-1.2+. These cells (Thy-1.2+) were capable of self-renewal in vitro and exhibited multiple differentiation potentials in comparison to Thy-1.2- cells, which lacked significant self-renewal capability and were mono- or bipotent progenitor cells. Separation of Thy-1.2+ cells into large or small Thy-1.2+ subpopulations showed that only the large Thy-1.2+ colony-forming cells possessed significant self-renewal capacity. Treatment of BDF1 bone marrow with anti-Thy-1.2 plus complement reduced primary colony formation by 67% and eliminated those colony-forming cells which had extensive self-renewal properties. In the presence of PWMSCM, depletion and reconstitution of T lymphocytes had no effect on primary or secondary colony formation. These data demonstrate that Thy-1 is present on primitive hematopoietic stem cells in post-5-FU bone marrow. In addition, they show that the murine S cell is Thy-1+.

Original languageEnglish (US)
Pages (from-to)1004-1011
Number of pages8
JournalJournal of Immunology
Issue number2
StatePublished - Dec 1 1985

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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