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Three distinct roles for TGF-beta during intercellular induction of apoptosis: a review
Abstract:
During intercellular induction of apoptosis, transformed fibroblasts are eliminated through the action of neighbouring nontransformed cells. TGF-beta thereby plays three distinct and central roles. a) TGF-beta released by transformed cells or added exogenously to the assay system triggers nontransformed cells to release a shortlived apoptosis inducing factor, which is specifically directed against transformed cells. b) TGF-beta is involved in the maintenance of the transformed state, which is required for expression of sensitivity for intercellular induction of apoptosis. c) TGF-beta further sensitizes transformed cells through downmodulation of their endogenous survival factors, which control a constitutively expressed apoptosis machinery. These data demonstrate that TGF-beta which is utilized by transformed fibroblasts for the maintenance of their transformed state, causes recognition of transformed cells by their nontransformed neighbours and triggers and enhances an apoptosis-inducing response which finally causes elimination of potential tumor cells.
Insights
Transforming growth factor-beta (TGF-β) eliminates cancer cells by triggering neighboring cells to induce apoptosis. It also maintains the transformed state and sensitizes cancer cells for elimination.
Area of Science:
- Cellular biology
- Cancer research
- Immunology
Background:
- Intercellular induction of apoptosis eliminates transformed fibroblasts via neighboring non-transformed cells.
- Transforming growth factor-beta (TGF-β) is implicated in this process.
Purpose of the Study:
- To elucidate the distinct roles of TGF-β in the intercellular induction of apoptosis against transformed cells.
Main Methods:
- Utilized an assay system with transformed and non-transformed fibroblasts.
- Investigated the effects of exogenously added and endogenously released TGF-β.
Main Results:
- TGF-β triggers non-transformed cells to release a short-lived apoptosis-inducing factor targeting transformed cells.
- TGF-β maintains the transformed state, enabling sensitivity to apoptosis induction.
- TGF-β downmodulates survival factors in transformed cells, enhancing apoptosis.
Conclusions:
- TGF-β is crucial for recognizing and eliminating potential tumor cells through intercellular apoptosis.
- It orchestrates multiple steps in the apoptosis induction pathway against transformed fibroblasts.