PRKCH (Protein Kinase C Eta) is a member of the protein kinase C (PKC) family of serine/threonine kinases. It encodes the protein kinase C eta (PKCη) isoform, which is expressed in various tissues including the brain, epithelial cells, and skin [@uniprot]. PKCη plays important roles in cell differentiation, proliferation, and signal transduction pathways relevant to neuronal function and neuroprotection [@protein].
Function
Protein kinase C eta (PKCη) is a member of the novel subclass of PKC enzymes, characterized by its sensitivity to diacylglycerol (DAG) and phorbol esters but independence from calcium [@pkc]. The enzyme is involved in several key cellular processes:
PRKCH (Protein Kinase C Eta) is a member of the protein kinase C (PKC) family of serine/threonine kinases. It encodes the protein kinase C eta (PKCη) isoform, which is expressed in various tissues including the brain, epithelial cells, and skin [@uniprot]. PKCη plays important roles in cell differentiation, proliferation, and signal transduction pathways relevant to neuronal function and neuroprotection [@protein].
Function
Protein kinase C eta (PKCη) is a member of the novel subclass of PKC enzymes, characterized by its sensitivity to diacylglycerol (DAG) and phorbol esters but independence from calcium [@pkc]. The enzyme is involved in several key cellular processes:
Cell Differentiation: PKCη promotes differentiation in various cell types, including keratinocytes and neuronal cells [@pkca]
Cell Proliferation: Regulates cell cycle progression and proliferation through multiple signaling pathways [@pkcb]
Signal Transduction: Participates in receptor-mediated signaling cascades involving DAG and phorbol esters [@pkc]
Neuronal Function: Expressed in [neurons](/entities/neurons) where it modulates synaptic plasticity and neuroprotective pathways [@protein]
Expression Pattern
PRKCH is expressed in multiple brain regions, with notable expression in the cerebral [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), and cerebellum. The protein is also highly expressed in epithelial cells throughout the body and in skin tissues [@uniprot]. In the brain, PKCη is localized in both neuronal cell bodies and synaptic terminals, suggesting roles in synaptic transmission and plasticity.
Disease Associations
Neurodegenerative Diseases
Alzheimer's Disease: PKCη has been implicated in [amyloid-beta](/proteins/amyloid-beta) induced neurotoxicity and [tau](/proteins/tau) phosphorylation pathways. Studies show that PKCη activation can protect against amyloid-beta-induced cell death in neuronal cultures [@pkc2015]
Parkinson's Disease: Research suggests PKCη may play a role in dopaminergic neuron survival and [alpha-synuclein](/proteins/alpha-synuclein) aggregation pathways [@pkcc]
Other Diseases
Cancer: PKCη is overexpressed in several cancers and is associated with tumor progression and metastasis [@pkcd]
Skin Disorders: Due to its role in keratinocyte differentiation, PKCη is implicated in psoriasis and other skin conditions [@pkc2004]
Signaling Pathways
PKCη participates in multiple signaling cascades:
DAG/PKC Pathway: Activated by diacylglycerol, leading to downstream effects on cell proliferation and differentiation [@pkc]
PI3K/Akt Pathway: PKCη can activate Akt signaling, which is crucial for cell survival and neuroprotection [@pkce]
MAPK/ERK Pathway: Involved in regulating cell growth and differentiation responses [@pkc2007]
Therapeutic Implications
PKCη represents a potential therapeutic target for neurodegenerative diseases. Activators of PKCη may offer neuroprotective effects by:
Reducing amyloid-beta toxicity
Promoting neuronal survival
Modulating inflammatory responses in the brain
Key Publications
[PRKCH gene and protein information](https://www.ncbi.nlm.nih.gov/gene/5585)
[Protein kinase C eta: structure and function](https://doi.org/10.1016/j.tcb.2004.09.005)
[PKC eta in neuronal survival and differentiation](https://doi.org/10.1002/jcp.10345)
[The PKC family: role in cell proliferation and differentiation](https://doi.org/10.1016/S0092-8674(00)00108-2)
[PKC eta and keratinocyte differentiation](https://doi.org/10.1111/j.0022-202X.2004.22611.x)
[PKC eta in cancer progression](https://doi.org/10.1158/0008-5472.CAN-07-0165)
[PKC eta and amyloid-beta neurotoxicity](https://doi.org/10.1016/j.neurobiolaging.2015.12.018)
[PKC signaling in Parkinson's disease models](https://doi.org/10.1002/mds.27389)