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Growth inhibitory activity in extracts from human fibroblasts
A Macieira-Coelho1, A Söderberg
1Department of Immunology, Faculty of Medecine Pitie-Salpetrière, Paris, France.
Journal of Cellular Physiology
|January 1, 1993
Summary
Researchers isolated a novel glycopeptide inhibitor from human fibroblasts that reduces DNA synthesis. Its decreased production is necessary for cell division initiation, offering new insights into fibroblast growth regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Previous studies suggested a growth inhibitor in human fibroblasts, but it remained unisolated.
- The molecule responsible for inhibiting fibroblast growth was previously unknown.
Purpose of the Study:
- To isolate and characterize the growth inhibitor from human fibroblasts.
- To investigate the role of this inhibitor in the cell division cycle.
Main Methods:
- Isolation of a glycopeptide fraction using electric charge, lectin affinity, and molecular mass.
- Assaying the effect of the glycopeptide on DNA synthesis in quiescent cells.
- Monitoring glycopeptide synthesis during the cell division cycle.
Main Results:
- A glycopeptide fraction was isolated, showing decreased synthesis upon cell stimulation.
- The isolated glycopeptide inhibited DNA synthesis in quiescent cells when added with a growth stimulus.
- The inhibitor's synthesis kinetics and molecular weight differ from known growth regulators.
- Growth factor-induced reduction in inhibitor synthesis appears essential for human fibroblast cell cycle initiation.
Conclusions:
- A novel glycopeptide inhibitor of human fibroblast growth has been isolated.
- The regulation of this inhibitor's synthesis by growth factors is a key step in initiating the cell division cycle.
- This finding provides new understanding of fibroblast proliferation control.