Hyaluronic acid dynamics are regulated by neural crest cells and NEDD4 in the developing cardiac outflow tract valves

Neural crest-specific loss of NEDD4 in mice disrupts cardiac outflow tract semilunar valve development, producing abnormal leaflet number and morphology alongside reduced hyaluronic acid in neural crest-derived mesenchyme.

• Why it matters: Semilunar valve formation depends on extracellular matrix cues, but how hyaluronic acid dynamics are controlled there—and by which cell types—remains unclear.
• What they did: The study deleted NEDD4 specifically in cardiac neural crest cells versus endocardium-derived valve mesenchyme, then quantified valve ECM components and tested NEDD4-deficient neural crest cells in vitro for hyaluronic acid synthesis versus turnover.
• The result: NEDD4 loss in neural crest cells specifically lowers hyaluronic acid abundance, while fibronectin and versican remain unaffected, and in vitro data indicate impaired hyaluronic acid synthesis, defining a cell-type-specific mechanism for semilunar valve development.

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