Release of early human hematopoietic progenitors from quiescence by antisense transforming growth factor beta 1 or Rb oligonucleotides.
Year: 1991
Type: article
Abstract: We have used antisense oligonucleotides to study the roles of transforming growth factor beta (TGF-beta) and the two antioncogenes, retinoblastoma susceptibility (Rb) and p53, in the negative regulation of proliferation of early hematopoietic cells in culture. The antisense TGF-beta sequence significantly enhanced the frequency of colony formation by multi-lineage, early erythroid, and granulomonocytic progenitors, but did not affect colony formation by late progenitors. Single cell culture and limiting dilution analysis indicated that autocrine TGF-beta is produced by a subpopulation of early progenitors. Antisense Rb but not antisense p53 yielded similar results in releasing multipotential progenitors (colony-forming unit-granulocyte/erythroid/macrophage/megakaryocyte) from quiescence. Rb antisense could partially reverse the inhibitory effect of exogenous TGF-beta. Anti-TGF-beta blocking antibodies, antisense TGF-beta, or Rb oligonucleotides all had similar effects. No additive effects were observed when these reagents were combined, suggesting a common pathway of action. Our results are consistent with the model that autocrine production of TGF-beta negatively regulates the cycling status of early hematopoietic progenitors through interaction with the Rb gene product.
Authors: J Hatzfeld, M L Li, E L Brown, H Sookdeo, J P Levesque, T O'Toole, C Gurney, S C Clark, A Hatzfeld
Language: English
Topic: TGF-β signaling in diseases
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W2113112343