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A new process of cancer prevention mediated through inhibition of tumor necrosis factor alpha expression
M Suganuma1, S Okabe, E Sueoka
1Saitama Cancer Center Research Institute, Japan.
Abstract:
Mechanisms of cancer prevention were studied using structurally different cancer-preventive agents, sarcophytol A, canventol, (-)-epigallo-catechin gallate, and tamoxifen, based on our evidence that tumor necrosis factor alpha (TNF-alpha) acts as an endogenous tumor promoter relevant to human carcinogenesis. Pretreatment with the four preventive agents commonly inhibited TNF-alpha mRNA expression and TNF-alpha release in BALB/3T3 cells induced by a tumor promoter, okadaic acid, whereas the expression of early response genes (c-jun, junB, c-fos, and fosB) was enhanced. These results strongly suggest that inhibition of TNF-alpha mRNA expression and its release is a new process of cancer prevention.
Insights
Four cancer-preventive agents inhibited tumor necrosis factor alpha (TNF-alpha) mRNA expression and release. This suggests inhibiting TNF-alpha is a novel cancer prevention mechanism.
Area of Science:
- Oncology
- Molecular Biology
- Carcinogenesis
Background:
- Tumor necrosis factor alpha (TNF-alpha) is implicated as an endogenous tumor promoter in human carcinogenesis.
- Understanding the mechanisms of cancer prevention is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate the cancer-preventive mechanisms of structurally diverse agents: sarcophytol A, canventol, (-)-epigallocatechin gallate, and tamoxifen.
- To determine the role of TNF-alpha inhibition in cancer prevention.
Main Methods:
- Utilized BALB/3T3 cells treated with okadaic acid, a known tumor promoter.
- Administered four distinct cancer-preventive agents prior to tumor promoter induction.
- Quantified TNF-alpha mRNA expression and release.
- Assessed the expression of early response genes (c-jun, junB, c-fos, fosB).
Main Results:
- All four agents commonly inhibited TNF-alpha mRNA expression and release induced by okadaic acid.
- The expression of early response genes (c-jun, junB, c-fos, fosB) was concurrently enhanced by the preventive agents.
- Demonstrated a consistent inhibitory effect of the agents on TNF-alpha signaling.
Conclusions:
- Inhibition of TNF-alpha mRNA expression and release represents a newly identified mechanism in cancer prevention.
- The findings support the potential of targeting TNF-alpha pathways for cancer chemoprevention.
- Structurally different agents converge on inhibiting TNF-alpha, highlighting its central role in carcinogenesis.