These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Activation of multiple hemopoietic growth factor genes in Abelson virus-transformed myeloid cells.
    Author: Humphries RK, Abraham S, Krystal G, Lansdorp P, Lemoine F, Eaves CJ.
    Journal: Exp Hematol; 1988 Oct; 16(9):774-81. PubMed ID: 2844575.
    Abstract:
    We have recently shown that Abelson murine leukemia (A-MuLV) virus can transform cells in large mixed colonies to give tumorigenic myeloid cell lines capable of autonomous growth in vitro. Initial studies revealed that granulocyte-macrophage colony-stimulating factor (GM-CSF) production was consistently activated in these cells. Using a sensitive S1 RNA mapping technique and additional bioassays, we have now obtained evidence of expression of other hemopoietic growth factor genes. Uniformly 32P-labeled, single-stranded DNA probes (greater than 4 x 10(8) cpm/micrograms) were generated for interleukin 3 (IL-3) and GM-CSF using pTZ based vectors. IL-3 mRNA was detected in four of four cloned transformants (from two different infections) at approximately 1% of the level seen in pokeweed mitogen (PWM)-stimulated spleen cells. GM-CSF mRNA was detected in the two clones that showed the highest IL-3 mRNA levels. Medium conditioned by these cells was able to stimulate IL-3-dependent 32D cells, and IL-3- and GM-CSF-dependent B6SUtA cells, and also supported the growth of a variety of single and multilineage colonies in assays of mouse marrow cells even in the presence of neutralizing antibodies to GM-CSF. Rearrangements of the IL-3 and GM-CSF genes were not apparent by Southern blot analysis. Additional bioassays revealed the presence of two other growth factors: IL-6 (hybridoma growth factor or Ifn-beta 2) assayed on B13.29 cells, a factor-dependent murine B-cell hybridoma; and a new pre-B-cell stimulatory factor different from any of the above. Elucidation of the mechanism underlying this phenomenon may provide important insights into the regulation of hemopoietic growth factor gene expression and the role such genes play in human leukemogenesis.
    [Abstract] [Full Text] [Related] [New Search]