Caspase14

Caspase-14 is a member of the cysteine-aspartic protease family, commonly known as caspases. These enzymes are critical for regulating inflammatory responses and programmed cell death, also known as apoptosis. Caspase-14 is primarily expressed in the epidermis, the outermost layer of the skin, and plays a distinct role compared to other caspases. Its main known function is in keratinocyte differentiation, a process where skin cells mature and form the protective barrier of the skin.

Unlike many caspases involved in apoptosis, caspase-14 appears to have a pro-survival role in epidermal homeostasis. It is activated by a specific cleavage event and its activity is essential for the proper formation of the stratum corneum, the outermost layer of the epidermis. This layer is crucial for preventing water loss and protecting the body from external environmental insults. Studies suggest that caspase-14 contributes to the processing of proteins involved in cornification, the process by which keratinocytes become flattened, dead cells filled with keratin.

Dysregulation of caspase-14 has been linked to certain skin conditions. For instance, reduced caspase-14 activity has been observed in some cases of ichthyosis, a group of genetic skin disorders characterized by dry, scaling skin. Conversely, its role in cancer is still being investigated, with some studies suggesting it might act as a tumor suppressor in certain contexts, while others indicate it could promote survival in specific cancer types. Further research is ongoing to fully elucidate the multifaceted roles of caspase-14 in health and disease.