What question did this study set out to answer?

This research aims to explore how local hemodynamic stress influences the maturation of fetal semilunar heart valves.

December 8, 2025Arteriosclerosis Thrombosis and Vascular Biology

Unidirectional Shear Stress–Operated NOTCH/CXCR4 Molecular Switch Controls Semilunar Valve Maturation and Collagen Stratification

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Authors

CDCharles R. Dai DPDuc H. Pham GJG Janani

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Implication

Experimental findings reveal shear stress influences extracellular matrix remodeling in fetal heart valves, suggesting new insights into valvular development.

Key Points

This research aims to explore how local hemodynamic stress influences the maturation of fetal semilunar heart valves.
Identified endocardial NOTCH1 and mesenchymal CXCR4 expressions in fetal valves.
Generated mouse models with conditional deletions of Notch and Cxcr4.
Conducted ex vivo tests with chick endocardial cells and valve organoids.
Performed quantitative analysis using histology, immunohistochemistry, and qRT-PCR.
Unidirectional laminar shear stress regulates CXCR4 expression through NOTCH signaling.
Global and mesenchymal cell-specific deletion of Cxcr4 resulted in hyperproliferative thickened valves.
Cxcr4 promotes matrix remodeling and inhibits BMP and WNT signaling pathways.

Cite This Study

Dai et al. (2025) studied this question.

synapsesocial.com/papers/693624ad4fa91c937236c583 https://doi.org/10.1161/atvbaha.125.322829

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Implication

Experimental findings reveal shear stress influences extracellular matrix remodeling in fetal heart valves, suggesting new insights into valvular development.