Bone Morphogenic Protein Signaling in Endothelial Function

Bone morphogenic proteins (BMPs) are members of the transforming growth factor-β superfamily that regulate diverse aspects of vascular biology. In endothelial cells, BMP ligands such as BMP2, BMP4 and BMP9 bind to type I and type II serine/threonine kinase receptors, eliciting phosphorylation of receptor-regulated SMAD proteins (SMAD1/5/8). Activated SMAD complexes translocate to the nucleus to modulate gene expression, controlling processes ranging from angiogenesis and arterial-venous specification to inflammatory activation and endothelial barrier integrity. BMP signalling is finely tuned by extracellular modulators (for example BMP endothelial precursor-derived regulator) and intracellular inhibitors, ensuring context-specific responses to mechanical and soluble cues. Under laminar shear stress, BMP9-SMAD1/5/8 promotes quiescent endothelial phenotypes and vessel stability, whereas oscillatory shear triggers BMP4 expression, driving inflammatory gene programmes via NF-κB and facilitating leukocyte adhesion. Dysregulation of BMP pathways contributes to pathological neointima formation, atherosclerotic plaque development and vascular remodelling following injury. Cross-talk with other pathways, notably Notch and homeobox transcription factors, integrates BMP signals with arterial-venous identity and inflammatory responses. Recent advances have elucidated the dual role of BMPs as both homeostatic regulators and instigators of endothelial dysfunction, highlighting their promise as therapeutic targets in cardiovascular disease, pulmonary hypertension and vascular calcification.

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Technical terms

BMP (Bone Morphogenic Protein): A family of growth factors within the transforming growth factor-β superfamily that regulate vascular development, homeostasis and remodelling.

Endothelial Cell (EC): A specialised cell type lining the interior surface of blood vessels, responsible for barrier function, tone regulation and inflammatory responses.

SMAD Proteins: Intracellular mediators phosphorylated by BMP receptors that form complexes to regulate gene transcription.

Shear Stress: The frictional force generated by blood flow across the endothelial surface, influencing cell signalling and function.

Neointima: The thickened innermost layer of a blood vessel formed by smooth muscle proliferation and matrix deposition following injury.

Arteriovenous Specification: The developmental process and signalling interplay by which endothelial cells adopt arterial or venous identities.

Notch Signalling: A cell–cell communication pathway that interacts with BMP signalling to determine vascular patterning and cell fate.

References

1. Homeobox B9 integrates bone morphogenic protein 4 with inflammation at atheroprone sites. Cardiovascular Research (2019).
2. Bone Morphogenic Protein 4 Produced in Endothelial Cells by Oscillatory Shear Stress Stimulates an Inflammatory Response*. Journal of Biological Chemistry (2003).
3. Platelet Bone Morphogenetic Protein-4 Mediates Vascular Inflammation and Neointima Formation after Arterial Injury. Cells (2021).
4. Arteriovenous specification: BMPER and TWSG1 determine endothelial cell fate via activation of synergistic BMP and Notch signaling. The FEBS Journal (2018).