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Non-invasive Optical Imaging of the Lymphatic Vasculature of a Mouse
Published on: March 8, 2013
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Mir-126 is a conserved modulator of lymphatic development
Zacharias Kontarakis1, Andrea Rossi1, Sophie Ramas1
1Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.
Developmental Biology
|March 19, 2018
Summary
MicroRNA 126 (miR-126) is crucial for lymphatic system development, regulating lymphatic hypoplasia and fluid balance. Its modulation of VEGFR signaling is essential for lymphatic development in both fish and mammals.
Area of Science:
- Developmental Biology
- Molecular Biology
- Vascular Biology
Background:
- Organ homeostasis depends on timely tissue repair processes.
- Lymphatic vessels are vital for fluid balance, tissue homeostasis, and preventing cancer metastasis.
- Knowledge of molecular regulators of lymphatic development remains limited.
Purpose of the Study:
- To investigate the role of microRNA 126 (miR-126) in lymphatic development.
- To elucidate the molecular mechanisms by which miR-126 influences lymphatic vessel formation.
- To determine if miR-126's function in lymphatic development is conserved across species.
Main Methods:
- Genetic approaches in zebrafish (mir-126 mutants, flt4 mutants) and mice (Mir-126/Flt4 interactions).
- Inhibition of MIR-126 in human Lymphatic Endothelial Cells (hLECs).
- Analysis of gene expression for Vascular Endothelial Growth Factor Receptors (VEGFR2 and VEGFR3/FLT4).
Main Results:
- Zebrafish lacking miR-126 (mir-126-/-) exhibit lymphatic hypoplasia, edema, and larval lethality, without vascular integrity defects.
- MIR-126 inhibition reduces hLEC response to VEGFA/VEGFC and downregulates VEGFR2 and VEGFR3 expression.
- Combined loss of miR-126 and FLT4 in zebrafish and mice leads to embryonic edema and lethality, highlighting a synergistic role.
Conclusions:
- miR-126 is essential for proper lymphatic system development in vertebrates.
- miR-126 regulates lymphatic development by modulating Vascular Endothelial Growth Factor Receptor (VEGFR) signaling.
- These findings reveal a conserved role for miR-126 in lymphatic vascular biology.
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