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Effects of protease inhibitors on radiation transformation in vitro
Abstract:
We have investigated the effects of three protease inhibitors, antipain, leupeptin, and soybean trypsin inhibitor, on the induction of oncogenic transformation in mouse C3H10T 1/2 cells by X-rays. The patterns of inhibition by the three protease inhibitors were different. Antipain was the most effective, having the ability to suppress completely radiation transformation as well as radiation transformation enhanced by the phorbol ester promoting agent 12-O-tetradecanoylphorbol-13-acetate. The fact that antipain could suppress transformation when present for only 1 day following irradiation suggests that an effect on a DNA repair process might be important in its action. Leupeptin was less effective than antipain in its inhibition of radiation transformation. Soybean trypsin inhibitor suppressed only the promotional effects of 12-O-tetradecanoylphorbol-13-acetate on transformation. Our results suggest that there may be more than one protease involved in carcinogenesis.
Insights
Protease inhibitors like antipain can suppress X-ray-induced oncogenic transformation in mouse cells, suggesting multiple proteases are involved in carcinogenesis. Antipain showed the strongest inhibitory effect on cell transformation.
Area of Science:
- Molecular biology
- Cell biology
- Cancer research
Background:
- Proteases play a role in cellular processes, including carcinogenesis.
- Oncogenic transformation can be induced by X-rays and promoted by agents like 12-O-tetradecanoylphorbol-13-acetate (TPA).
Purpose of the Study:
- To investigate the effects of three protease inhibitors—antipain, leupeptin, and soybean trypsin inhibitor—on X-ray-induced oncogenic transformation in mouse C3H10T 1/2 cells.
- To determine the differential inhibitory effects of these agents on radiation-induced transformation and TPA-promoted transformation.
Main Methods:
- Mouse C3H10T 1/2 cells were exposed to X-rays to induce oncogenic transformation.
- Cells were treated with protease inhibitors (antipain, leupeptin, soybean trypsin inhibitor) at various time points.
- The phorbol ester 12-O-tetradecanoylphorbol-13-acetate (TPA) was used as a promoting agent to enhance transformation.
Main Results:
- Antipain demonstrated significant suppression of both X-ray-induced transformation and TPA-enhanced transformation.
- Leupeptin showed less effectiveness in inhibiting radiation-induced transformation compared to antipain.
- Soybean trypsin inhibitor specifically inhibited the promotional effects of TPA on transformation, but not radiation-induced transformation alone.
Conclusions:
- The results suggest that multiple proteases are involved in the complex process of carcinogenesis.
- Antipain's efficacy, even when applied post-irradiation, indicates a potential role in DNA repair mechanisms.
- The differential effects of the inhibitors highlight distinct protease activities in radiation transformation versus promotion by TPA.