Abstract
Plain Language SummarySkin cancer is the most common type of cancer seen in the clinic. The amount of lifelong sun exposure and the degree of sunburns are important contributors to the development of skin cancer. Despite massive prevention campaigns promoting better sun habits by staying in the shade and applying sufficient sunscreen, skin cancer cases are still increasing. To address this, researchers are exploring different compounds for oral sun protection. In this study, we tested whether combining vitamin B3 (nicotinamide) with the well-known medication metformin or a known antioxidant called phloroglucinol could enhance its protection against sun-induced skin cancer. Hairless mice were given either nicotinamide alone or nicotinamide at a lower dose combined with either metformin or phloroglucinol through their drinking water and exposed to simulated sunlight 3 times per week to induce skin cancer. We show for the first time that mice treated with all three nicotinamide groups had a delay in skin cancer onset compared to sun-exposed control. Furthermore, we show that the nicotinamide and phloroglucinol combination provides the same sun protection as nicotinamide alone, whereas the combination with metformin did not. Notably, the nicotinamide combined with phloroglucinol provided a reduction in DNA damage, suggesting a better-suited mechanism of action for preventing skin cancer. Overall, the study indicates a potential strategy of combining compounds to enhance oral sun protection to prevent skin cancer.
Published Version
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