What question did this study set out to answer?

To resolve the cellular mechanisms of atrioventricular valve morphogenesis and determine how signaling disruptions cause functional congenital valve defects.

February 13, 2008Development

High-speed imaging of developing heart valves reveals interplay of morphogenesis and function

Q: What is the clinical evidence from this study?

Study design: Other. Population: Atrioventricular valve morphogenesis. Intervention: Inhibition of ErbB-, TGFbeta- or Cox2 (Ptgs2)-dependent signaling. Primary outcome: Valve morphogenesis and function.

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Key result

Inhibiting ErbB-, TGFbeta-, or Cox2-dependent signaling in zebrafish disrupted atrioventricular valve morphogenesis and function by altering cellular behavior and myocardial morphology.

Population

Zebrafish embryos

Design

Preclinical

Authors

PSPaul ScherzUniversity of Notre Dame JHJan HuiskenMorgridge Institute for Research PSPankaj Sahai‐HernandezUniversity of California, San Diego

Discussion

Member takes

Implication

Suggests candidate pathways for congenital valve defects; leaves open therapeutic relevance pending mammalian validation.

Key Points

To resolve the cellular mechanisms of atrioventricular valve morphogenesis and determine how signaling disruptions cause functional congenital valve defects.
Tracked atrioventricular valve leaflet formation and canal dynamics at cellular resolution using high-speed fluorescence microscopy in embryonic zebrafish.
Pharmacologically inhibited ErbB, TGF-beta, and Cox2 (Ptgs2) signaling pathways to evaluate cellular architecture and functional valve mechanics.
Demonstrated that valve leaflets emerge directly through cellular invagination rather than through intermediate endocardial cushions across three developmental phases.
Identified that the atrioventricular canal is initially sealed by myocardial rolling and relaxation, followed by mechanical obstruction from expanding leaflets.
Found that inhibiting ErbB, TGF-beta, or Cox2 signaling disrupted valve geometry, with Cox2 inhibition specifically altering myocardial cell size, ventricular shape, and closure mechanics.

Structured PICO

Population

Zebrafish embryos

Intervention

Inhibition of ErbB-, TGFbeta- or Cox2 (Ptgs2)-dependent signaling

Outcome

Atrioventricular valve (AVV) morphogenesis and functionsurrogate

High-speed imaging in zebrafish reveals that atrioventricular valve leaflets form via invagination and that specific signaling pathways like Cox2 regulate distinct cellular behaviors during morphogenesis.

Cite This Study

Scherz et al. (2008) studied Atrioventricular valve morphogenesis. Inhibition of ErbB-, TGFbeta- or Cox2 (Ptgs2)-dependent signaling was evaluated on Valve morphogenesis and function. Inhibiting ErbB-, TGFbeta-, or Cox2-dependent signaling in zebrafish disrupted atrioventricular valve morphogenesis and function by altering cellular behavior and myocardial morphology.

synapsesocial.com/papers/6a93e2508a8748f227d686aa https://doi.org/10.1242/dev.010694

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High-speed imaging of developing heart valves reveals interplay of morphogenesis and function

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

High-speed imaging of developing heart valves reveals interplay of morphogenesis and function

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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