Abstract
Endothelial cell migration is an important step during angiogenesis, and its dysregulation contributes to aberrant neovascularization. The bone morphogenetic proteins (BMPs) are potent stimulators of cell migration and angiogenesis. Using microarray analyses, we find that myosin-X (Myo10) is a BMP target gene. In endothelial cells, BMP6-induced Myo10 localizes in filopodia, and BMP-dependent filopodial assembly decreases when Myo10 expression is reduced. Likewise, cellular alignment and directional migration induced by BMP6 are Myo10 dependent. Surprisingly, we find that Myo10 and BMP6 receptor ALK6 colocalize in a BMP6-dependent fashion. ALK6 translocates into filopodia after BMP6 stimulation, and both ALK6 and Myo10 possess intrafilopodial motility. Additionally, Myo10 is required for BMP6-dependent Smad activation, indicating that in addition to its function in filopodial assembly, Myo10 also participates in a requisite amplification loop for BMP signaling. Our data indicate that Myo10 is required to guide endothelial migration toward BMP6 gradients via the regulation of filopodial function and amplification of BMP signals.
MeSH Terms
Animals
Bone Morphogenetic Protein 6
Bone Morphogenetic Protein Receptors/agonists,metabolism
Bone Morphogenetic Protein Receptors, Type I/metabolism
Bone Morphogenetic Proteins/genetics,metabolism
Cell Differentiation/physiology
Cell Movement/physiology
Cell Polarity/physiology
Cells, Cultured
Endothelial Cells/metabolism,ultrastructure
Gene Expression Regulation, Developmental/genetics
Mice
Myosins/metabolism
Neovascularization, Physiologic/physiology
Pseudopodia/metabolism,ultrastructure
Signal Transduction/physiology
Smad Proteins/metabolism
Chemicals
Bmp6 protein, mouse
Bone Morphogenetic Protein 6
Bone Morphogenetic Proteins
Myo10 protein, mouse
Smad Proteins
Bmpr1b protein, mouse
Bone Morphogenetic Protein Receptors
Bone Morphogenetic Protein Receptors, Type I
Myosins
Authors & Affiliations
9 authors, click to expand affiliations / ORCID
Pi Xinchun
Carolina Cardiovascular Biology Center, University of North Carolina, Chapel Hill, NC 27599, USA.
Ren Rongqin
Kelley Russell
Zhang Chunlian
Moser Martin
Bohil Aparna B
Divito Melinda
Cheney Richard E
Patterson Cam
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