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TGF-beta isoforms and fibroblast growth factor exhibit analogous indirect antioncogenic activity through triggering
Abstract:
TGF-beta-1 has recently been shown to trigger nontransformed effector cells to induce apoptosis specifically in transformed cells. This intercellular induction of apoptosis has been discussed as a potential control step in oncogenesis. Here we show that triggering of intercellular induction of apoptosis is not a non-specific growth factor effect, but is restricted to the TGF-beta and FGF family of growth factors. Within the TGF-beta family, all isoforms triggered the intercellular induction of apoptosis with the same efficiency. This finding illustrates that these effects observed have been conserved throughout evolution, which thus points to their potential biological significance. The parallel action of TGF-beta and FGF in the intercellular induction of apoptosis correlates with the role of both families of factors in the establishment and maintenance of the transformed state. Autocrine loops of either growth factor seem to be recognized by the surrounding nontransformed cells and to evoke an apoptosis- inducing effect which thus prevents the survival and outgrowth of potential tumor cells.
Insights
Transforming growth factor-beta (TGF-β) and fibroblast growth factor (FGF) trigger apoptosis in transformed cells, preventing tumor growth. This conserved mechanism highlights their role in controlling oncogenesis.
Area of Science:
- Cellular Biology
- Molecular Oncology
- Cancer Research
Background:
- Nontransformed cells can induce apoptosis in transformed cells, a process implicated in cancer control.
- The specific growth factors responsible for this intercellular apoptosis induction were not fully elucidated.
Purpose of the Study:
- To determine if the induction of apoptosis in transformed cells by nontransformed cells is a general growth factor effect.
- To identify the specific families of growth factors involved in this process.
Main Methods:
- Investigated the role of various growth factor families in inducing apoptosis in transformed cells.
- Examined the efficiency of different Transforming Growth Factor-beta (TGF-β) isoforms.
Main Results:
- Intercellular apoptosis induction is specifically mediated by the TGF-β and Fibroblast Growth Factor (FGF) families.
- All TGF-β isoforms demonstrated equal efficiency in triggering apoptosis.
- The conserved nature of this effect across evolution suggests significant biological importance.
Conclusions:
- TGF-β and FGF signaling pathways are crucial in recognizing and eliminating potential tumor cells via apoptosis.
- Autocrine loops of TGF-β and FGF are key targets for non-transformed cells to prevent cancer cell survival and outgrowth.