Calcium/calmodulin-dependent protein kinase type 1

CAMK1 is a calcium/calmodulin-dependent protein kinase that functions downstream of NMDA receptors to regulate synaptic plasticity, dendritic growth, and spine formation in hippocampal neurons (UniProt: Q14012). The protein operates within the CaMKK-CAMK1 signaling cascade, phosphorylating key substrates including ARHGEF7 and MARK2 to promote neuronal differentiation, neurite outgrowth, and long-term potentiation. Beyond neuronal contexts, CAMK1 regulates cell cycle progression, hormone production, and actin cytoskeleton organization.

CAMK1 is highly relevant to synaptic function and learning-memory processes, roles central to hippocampal and cerebellar circuits. Its involvement in NMDA receptor signaling and dendritic plasticity positions it within pathways critical for cognitive function.

In Alzheimer's disease, CAMK1 is downregulated in human post-mortem AD brain compared to age-matched controls (Chaparral AD proteomics), with a mean log2 fold-change of −0.38 across analyzed subcellular fractions. This reduction may reflect compromised calcium-dependent synaptic signaling and plasticity capacity characteristic of AD pathology.