Regulation of colony-stimulating activity production from bone marrow stromal cells by the hematoregulatory peptide, HP-5

A. G. King, J. E. Talmadge, A. M. Badger, Louis Pelus

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

It has been reported that the granulocyte-derived hematoregulatory pentapeptide, HP-5, and its dimer (HP-5b) have potent hematoregulatory properties. The proposed mechanism of action for HP-5b is synergy with colony-stimulating activity (CSA) resulting in enhanced myeloid colony formation in vitro. We now demonstrate that the effects of HP-5b on enhanced colony formation are indirect and mediated by an effect on CSA production by bone marrow stromal cells. Bone marrow stromal cell culture systems from mice, rats, and humans were used as target cells for the action of HP-5 monomer and dimer. Cell-free supernatans from these cultures were assayed for CSA in a murine granulocyte-macrophage colony-forming unit (CFU-GM) assay. Supernatants from stromal cell cultures pulsed for 1 h with HP-5b resulted in increased murine CFU-GM colony proliferation with an estimated half-maximal effective concentration (EC50) of 1-5 ng/ml. This increase in CFU-GM proliferation was neutralized by anti-macrophage colony-stimulating factor (anti-M-CSF) antibodies. The HP-5 monomer was without effect on constitutive CSA production by stromal cells, but it antagonized HP-5b-induced CSA production in a dose-responsive manner with an estimated half-maximal inhibitory concentration (IC50) of 0.2-0.4 ng/ml). The ability of HP-5 monomer to antagonize HP-5b induction of CSA appears specific in that HP-5 monomer failed to alter interleukin 1 (IL-1) or lipopolysaccharide (LPS)-induced stromal cell CSA production.

Original languageEnglish (US)
Pages (from-to)223-228
Number of pages6
JournalExperimental Hematology
Volume20
Issue number2
StatePublished - 1992
Externally publishedYes

Fingerprint

Granulocyte-Macrophage Progenitor Cells
Mesenchymal Stromal Cells
Stromal Cells
Cell Culture Techniques
Macrophage Colony-Stimulating Factor
Interleukin-1
Granulocytes
Inhibitory Concentration 50
Lipopolysaccharides
neutrophil peptide 5
Antibodies

Keywords

  • Colony-stimulating activity
  • Hematoregulation
  • Stromal cells

ASJC Scopus subject areas

  • Cancer Research
  • Cell Biology
  • Genetics
  • Hematology
  • Oncology
  • Transplantation

Cite this

Regulation of colony-stimulating activity production from bone marrow stromal cells by the hematoregulatory peptide, HP-5. / King, A. G.; Talmadge, J. E.; Badger, A. M.; Pelus, Louis.

In: Experimental Hematology, Vol. 20, No. 2, 1992, p. 223-228.

Research output: Contribution to journalArticle

King, A. G. ; Talmadge, J. E. ; Badger, A. M. ; Pelus, Louis. / Regulation of colony-stimulating activity production from bone marrow stromal cells by the hematoregulatory peptide, HP-5. In: Experimental Hematology. 1992 ; Vol. 20, No. 2. pp. 223-228.
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