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PRKCH
PRKCH Full Name
protein kinase C, eta
PRKCH Introduction
Protein kinase C eta (PRKCH, or PKCη) is a highly specialized member of the "novel" protein kinase C (nPKC) subfamily. Consistent with the biochemical profile of other novel PKCs, the enzymatic activation of PRKCH requires the presence of diacylglycerol (DAG) and membrane phospholipids, such as phosphatidylserine, but operates entirely independent of calcium ions. What distinguishes PRKCH from its more ubiquitously expressed family members is its highly restricted and specific tissue distribution. It is predominantly expressed in epithelial tissues, with particularly high abundance in the skin (epidermis), the respiratory tract, and the gastrointestinal mucosa, indicating a highly targeted role in epithelial homeostasis.
PRKCH serves as a master molecular switch regulating the delicate balance between epithelial cell proliferation and terminal differentiation. In the skin, PRKCH is a critical driver of epidermal barrier formation. Upon activation, it interacts with the cell cycle machinery to induce a G1 phase arrest—often by modulating cyclins and upregulating cyclin-dependent kinase inhibitors like p21—thereby forcing the cells to exit the proliferative pool. Concurrently, it orchestrates the expression of key structural proteins necessary for cornification. Beyond its role in differentiation, PRKCH is also deeply involved in cellular survival pathways, particularly by interacting with the caspase cascade and conferring resistance to apoptosis under stress conditions. Because of its profound influence on epithelial cell fate and survival, the dysregulation of PRKCH is heavily implicated in severe dermatological and oncological pathologies. In the context of inflammatory skin diseases, such as psoriasis, altered PRKCH signaling contributes to defective epidermal differentiation and hyperproliferation.
Figure 1. Schematic representation of the molecular mechanism of PKCη-YAP-mediated regulation of the Hippo pathway and metastasis in TNBC. (Source: Liju VB, et al. 2026)
In oncology, PRKCH exhibits a complex, context-dependent role. While its normal function in promoting differentiation can act as a natural barrier to early tumorigenesis, its aberrant overexpression is frequently observed in several advanced malignancies, including breast cancer, non-small cell lung cancer, and renal cell carcinoma. In these cancerous environments, hijacked PRKCH signaling aggressively promotes tumor cell survival, drives anti-apoptotic networks, and critically, confers robust resistance to various chemotherapeutic agents. Consequently, understanding the precise tissue-specific mechanisms of PRKCH remains a vital objective for developing targeted interventions for chemoresistant carcinomas and chronic epithelial disorders.
Alternate Names for PRKCH
PRKCH; protein kinase C, eta; Pkch; protein kinase C eta type; PKC-L; nPKC-eta;
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