Osteopontin Dynamics in Vascular Smooth Muscle Cell Biology

Osteopontin is a multifunctional matricellular glycoprotein that orchestrates diverse aspects of vascular smooth muscle cell (VSMC) behaviour, including proliferation, migration, adhesion and phenotypic switching. Under physiological conditions, VSMCs display a contractile phenotype that maintains vascular tone and structural integrity. In response to injury or inflammatory stimuli, osteopontin expression is upregulated, triggering VSMCs to adopt a synthetic phenotype marked by enhanced extracellular matrix remodelling and secretion of proinflammatory mediators. These dynamics contribute to arterial remodelling, atherosclerotic plaque development and vascular calcification. Osteopontin interacts with cell-surface receptors such as integrins and CD44, activating intracellular cascades including NF-κB, MAPK and PI3K–AKT pathways. Such signalling governs cytoskeletal reorganisation, matrix metalloproteinase production and calcium deposition. In calcifying environments, osteopontin can inhibit hydroxyapatite crystal growth, modulating medial and intimal calcification. The balance between acute, protective osteopontin upregulation—promoting wound healing and neovascularisation—and chronic elevation—associated with plaque instability and adverse cardiovascular outcomes—underpins its clinical significance. Understanding spatiotemporal regulation of osteopontin in VSMCs offers insights into therapeutic strategies aimed at stabilising plaques, attenuating neointimal hyperplasia and preventing vascular stiffening in ageing and disease.

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Osteopontin Dynamics in Vascular Smooth Muscle Cell Biology publication trend

The graph below shows the total number of articles in osteopontin dynamics in vascular smooth muscle cell biology across all publications each year (not limited to Nature Index journals).

Technical terms

Osteopontin: A secreted phosphorylated glycoprotein that modulates cell adhesion, migration and survival via integrin and CD44 receptors.

Vascular smooth muscle cell (VSMC): A specialised muscle cell in the artery wall that regulates vessel tone and undergoes phenotypic switching during vascular remodelling.

Phenotypic switching: The reversible transition of VSMCs from a contractile to a synthetic state, characterised by altered gene expression and increased matrix remodelling.

Atherosclerotic plaque vulnerability: The propensity of an arterial plaque to rupture, influenced by cellular composition, inflammatory activity and extracellular matrix integrity.

Calcification: Deposition of calcium phosphate crystals in the vascular wall, which can stiffen arteries and affect plaque stability.

References

1. Serum secreted phosphoprotein 1 level is associated with plaque vulnerability in patients with coronary artery disease. Frontiers in Immunology (2024).
2. The Role of Osteopontin in Atherosclerosis and Its Clinical Manifestations (Atherosclerotic Cardiovascular Diseases)—A Narrative Review. Biomedicines (2023).
3. Osteopontin in Cardiovascular Diseases. Biomolecules (2021).