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Imaging Cleared Embryonic and Postnatal Hearts at Single-cell Resolution
Published on: October 7, 2016
BMP2 is required for early heart development during a distinct time period
T Schlange1, B Andrée, H H Arnold
1Department of Cell and Molecular Biology, Institute of Biochemistry and Biotechnology, Technical University of Braunschweig, Spielmannstrasse 7, 38106, Braunschweig, Germany.
Mechanisms of Development
|March 8, 2000
Summary
Bone morphogenetic protein 2 (BMP2) is crucial for early heart development. This study reveals distinct gene expression patterns and timing in response to BMP2 signaling, highlighting complex regulation of cardiogenesis.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cardiovascular Research
Background:
- Bone morphogenetic protein 2 (BMP2) is a key signaling molecule essential for specifying cardiogenic mesoderm in vertebrates, analogous to Drosophila's dpp.
- Understanding the precise temporal requirements for BMP2 signaling is critical for elucidating the mechanisms of early heart formation.
Purpose of the Study:
- To analyze the time-course of BMP2 requirement for early heart formation in chick embryos.
- To investigate the differential sensitivity of cardiac marker genes to BMP signaling inhibition using Noggin.
- To characterize the kinetics of cardiac gene induction by BMP2 in non-cardiac mesoderm.
Main Methods:
- Analysis of gene expression (NKX2.5, GATA4, eHAND, Mef2A, vMHC) in whole chick embryos and isolated antero-lateral plate mesoderm explants.
- Inhibition of BMP signaling using Noggin in explants and in vivo via Noggin-expressing cell implantation at various developmental stages (4-8).
- Time-course study of BMP2-induced cardiac gene expression in central mesendoderm explants.
Main Results:
- Noggin treatment at early stages (4) led to loss of multiple cardiac markers, with differential sensitivity observed at later stages (5-8).
- In vivo BMP signaling inhibition (stages 4-8) resulted in suppressed expression of NKX2.5 and eHAND, with variable effects on GATA4.
- BMP2 induction of cardiac markers in central mesendoderm showed distinct kinetics, with early genes (GATA4, MEF2A) induced within 6 hours and late genes (vMHC, titin) after 48 hours.
Conclusions:
- Cardiac marker genes exhibit distinct expression kinetics following BMP2 stimulation and differential responses to BMP signaling inhibition.
- These findings suggest a complex regulatory network governing myocardial gene expression during early tubular heart development.
- The temporal dynamics of gene responses underscore the intricate, stage-specific requirement for BMP signaling in cardiogenesis.
