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2018 ; 115
(16
): E3682-E3691
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Mechanosensitivity of Jagged-Notch signaling can induce a switch-type behavior in
vascular homeostasis
#MMPMID29610298
Loerakker S
; Stassen OMJA
; Ter Huurne FM
; Boareto M
; Bouten CVC
; Sahlgren CM
Proc Natl Acad Sci U S A
2018[Apr]; 115
(16
): E3682-E3691
PMID29610298
show ga
Hemodynamic forces and Notch signaling are both known as key regulators of
arterial remodeling and homeostasis. However, how these two factors integrate in
vascular morphogenesis and homeostasis is unclear. Here, we combined experiments
and modeling to evaluate the impact of the integration of mechanics and Notch
signaling on vascular homeostasis. Vascular smooth muscle cells (VSMCs) were
cyclically stretched on flexible membranes, as quantified via video tracking,
demonstrating that the expression of Jagged1, Notch3, and target genes was
down-regulated with strain. The data were incorporated in a computational
framework of Notch signaling in the vascular wall, where the mechanical load was
defined by the vascular geometry and blood pressure. Upon increasing wall
thickness, the model predicted a switch-type behavior of the Notch signaling
state with a steep transition of synthetic toward contractile VSMCs at a certain
transition thickness. These thicknesses varied per investigated arterial location
and were in good agreement with human anatomical data, thereby suggesting that
the Notch response to hemodynamics plays an important role in the establishment
of vascular homeostasis.