Journal
JOURNAL OF MUSCLE RESEARCH AND CELL MOTILITY
Volume 30, Issue 1-2, Pages 41-55Publisher
SPRINGER
DOI: 10.1007/s10974-009-9173-1
Keywords
LPP; Palladin; Smooth muscle; Injury; Atherosclerosis
Categories
Funding
- NIH [PO1 HL48807, PO1 HL 19842, R01 HL 082836, 5-T32-HL0084]
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Lipoma preferred partner (LPP) localizes to focal adhesions/dense bodies, is selectively expressed in smooth muscle cells (SMC) and enhances cell migration. SMCs cultured on denatured collagen or on a rigid substrate, up regulated expression of LPP, its partner palladin, tenascin C (TN-C), phosphorylated focal adhesion kinase (pFAK) and exhibited robust stress fibers. In an endothelial (EC)/SMC hemodynamic flow system, shear stress waveforms mimicking atheroprone flow, applied to the EC layer, significantly decreased expression of SMC LPP and palladin. They were also down regulated with TN-C, in an ApoE murine model of atherosclerosis and with oxidative stress but up regulated in an arterial injury model in response to upstream sequential changes in pFAK, Prx1 and TN-C. In conclusion, expression of LPP and palladin are modulated by a mix of mechanical cues, oxidative stress and substrate composition which translate into their up or down regulation in vessel wall injury and early atherogenesis.
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