Skin tumorigenic potential of benzanthrone: prevention by ascorbic acid

Area of Science:

• Toxicology
• Dermatology
• Carcinogenesis

Background:

• Occupational exposure to benzanthrone (BA) is linked to skin toxicological issues.
• Long-term BA exposure may potentially lead to skin tumorigenicity.
• Understanding the carcinogenic potential of BA and protective agents is crucial.

Purpose of the Study:

• To evaluate the tumor-initiating and promoting potentials of pure benzanthrone (PBA) and commercial benzanthrone (CBA).
• To assess the preventive role of ascorbic acid (AsA) against BA-induced skin tumorigenicity.
• To investigate the effects of BA and AsA on xenobiotic enzyme levels.

Main Methods:

• A two-stage mouse skin tumor protocol was employed.
• Tumor initiation and promotion were assessed following topical application of PBA and CBA.
• The protective effects of AsA were evaluated through prior treatment and co-administration protocols.
• Xenobiotic enzyme levels were measured after topical treatments.

Main Results:

• PBA exhibited tumor-initiating activity, while CBA showed both tumor-initiating and promoting activities.
• AsA treatment delayed tumor onset and increased latency periods when co-administered with BA.
• Topical CBA significantly increased xenobiotic enzyme levels.
• AsA treatment restored impaired xenobiotic enzyme activities caused by CBA.

Conclusions:

• Ascorbic acid (AsA) demonstrates a protective effect against pure (PBA) and commercial benzanthrone (CBA) induced skin tumorigenicity.
• AsA helps in restoring xenobiotic enzyme levels altered by CBA exposure.
• AsA may be a useful agent in preventing BA-induced skin tumors in occupational settings.