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Interleukin‐1 alpha derived from ultraviolet B‐exposed keratinocytes is associated with a decrease of endocytic collagen receptor Endo180

Endo180 contributes to the remodeling of the collagen fibers that comprise the dermal matrix due to the internalization of extracellular collagen fragments. In the sun‐exposed elder skin, an accumulation of collagen fragments was observed in the dermal matrix which was associated with a reduction in Endo180 in the dermal fibroblasts. This suggests that the loss of Endo180 results in the accumulation of collagen fragments in the surrounding fibroblasts and causes interference with dermal matrix remodeling via collagen fibers. The purpose of the study was to identify a mechanism by which ultraviolet B (UVB) exposure induces a loss of Endo 180 with a specific focus on the crosstalk between keratinocytes and fibroblasts.