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Tumor-promoting phorbol esters inhibit procollagen synthesis at a pretranslational level in JB-6 mouse epidermal
Abstract:
Collagen synthesis was inhibited in JB-6 mouse epidermal cells after exposure to 12-O-tetradecanoylphorbol-13-acetate under conditions leading to irreversible neoplastic transformation. In vitro translation and hybridization studies demonstrated a dramatic decrease in collagen mRNA in 12-O-tetradecanoylphorbol-13-acetate-treated cells, suggesting that the inhibition of collagen synthesis in response to 12-O-tetradecanoylphorbol-13-acetate is due to regulation at a pretranslational level.
Insights
12-O-tetradecanoylphorbol-13-acetate inhibits collagen synthesis in mouse skin cells by reducing collagen messenger RNA (mRNA) levels. This suggests a pretranslational mechanism controls collagen production during neoplastic transformation.
Area of Science:
- Biochemistry
- Cell Biology
- Dermatology
Background:
- Collagen is a crucial structural protein in the skin.
- Neoplastic transformation involves uncontrolled cell growth.
- 12-O-tetradecanoylphorbol-13-acetate (TPA) is a known tumor promoter.
Purpose of the Study:
- To investigate the effect of TPA on collagen synthesis in epidermal cells.
- To determine the molecular mechanism underlying TPA-induced inhibition of collagen synthesis.
Main Methods:
- JB-6 mouse epidermal cells were treated with TPA.
- Collagen synthesis was measured.
- Collagen mRNA levels were assessed using in vitro translation and hybridization assays.
Main Results:
- TPA treatment significantly inhibited collagen synthesis.
- A dramatic decrease in collagen mRNA was observed in TPA-exposed cells.
- The results indicate that TPA affects collagen production at a pretranslational level.
Conclusions:
- TPA-induced inhibition of collagen synthesis in mouse epidermal cells occurs via regulation at the pretranslational level.
- This finding provides insight into the molecular events during TPA-mediated neoplastic transformation.