A Novel In Vivo Model for Evaluating Agents That Protect Against Ultraviolet A-Induced Photoaging

The study utilized a transgenic mouse model to evaluate the effectiveness of sunscreens in protecting against UVA-induced photoaging. The mice were exposed to PUVA to induce photoaging, and the study found that all tested sunscreens reduced CAT activity, indicating protection against UVA-induced damage. The combination of an SPF 15 sunscreen and a UVA filter provided the highest level of protection. The model demonstrated sensitivity and potential to simulate human cutaneous photoaging, highlighting the importance of UVA protection in sunscreens and suggesting that inflammation might play a role in elastin gene induction by UVA. The study emphasized the need for sunscreens with higher SPF ratings to incorporate more UVA protection.