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This study investigates the degradation profile of finasteride, a drug used for benign prostatic hyperplasia and androgenetic alopecia, under stress conditions. Using LC–MS, three degradation products were identified under acidic conditions, with minimal degradation in alkaline and oxidative environments. The degradation products were isolated and analyzed using preparative HPLC, HRMS, and NMR spectroscopy. The study revealed that the degradation process of DP-1 involved cleavage of the tert-butyl amide and addition of water across the alkene moiety. The structure of DP-1 was established through various spectroscopic techniques, and it, along with other degradation products, was found to be previously undescribed. These findings enhance the understanding of finasteride's degradation chemistry, aiding impurity profiling, stability studies, and quality control of its formulations.

The study explored the role of loricrin, an epidermal protein, in maintaining skin homeostasis and its impact on the immune system. Despite the unexpected discovery of the asymptomatic loricrin knockout (LKO) phenotype, LKO mice revealed altered homeostasis due to redox-driven backup responses. The research aimed to understand how changes in epidermal differentiation affect immune signaling within the skin. By reviewing existing evidence, the study proposed an integrated view of how the peripheral immune system is regulated in squamous epithelial tissue with truncated differentiation, potentially identifying epidermal factors that influence immune effector functions.