Osteocrin

Also known as: Musclin, OSTN, P61366

Osteocrin (also known as Musclin, OSTN, P61366) is a secreted peptide hormone primarily expressed in bone and skeletal muscle, with emerging roles in neuronal development. Its mechanism of action involves binding to natriuretic peptide receptor C (NPR-C), thereby modulating cGMP signaling pathways. In the developing cerebral cortex, Osteocrin acts as a negative regulator of dendritic growth, limiting the expansion of dendritic arbors in response to sensory experience. This activity is mediated through the suppression of the cGMP-dependent protein kinase pathway, which fine-tunes neuronal connectivity during critical periods of cortical plasticity. Key research findings demonstrate that Osteocrin expression in the cortex is activity-dependent, increasing with sensory stimulation and peaking during early postnatal development. Knockout studies in mice show that loss of Osteocrin leads to excessive dendritic arborization and altered synaptic connectivity, while overexpression restricts dendritic growth. These effects are specific to cortical neurons and are not observed in other brain regions, highlighting its role in experience-dependent cortical maturation. Additionally, Osteocrin has been implicated in bone metabolism and muscle physiology, where it regulates osteoblast differentiation and glucose uptake, though its neuronal functions remain the primary focus of current research. Clinically, Osteocrin’s role in dendritic plasticity suggests potential relevance for neurodevelopmental disorders characterized by aberrant connectivity, such as autism spectrum disorders or intellectual disability. However, its experimental status limits direct therapeutic applications. Further studies are needed to clarify its signaling specificity and long-term effects on neural circuit function. For research purposes only — not medical advice.

Key data

Mechanism of action

Hormone that acts as a regulator of dendritic growth in the developing cerebral cortex in response to sensory experience (PubMed:27830782). Induced in the brain following membrane depolarization and inhibits dendritic branching in neurons of the developing cortex (PubMed:27830782). Probably acts by binding to natriuretic peptide receptor NPR3/NPR-C, thereby preventing binding between NPR3/NPR-C and natriuretic peptides, leading to increase cGMP production (By similarity)

Research & studies

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