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2014 ; 37
(ä): 92-101
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Thrombospondin-1 and CD47 regulation of cardiac, pulmonary and vascular responses
in health and disease
#MMPMID24418252
Rogers NM
; Sharifi-Sanjani M
; Csányi G
; Pagano PJ
; Isenberg JS
Matrix Biol
2014[Jul]; 37
(ä): 92-101
PMID24418252
show ga
Cardiovascular homeostasis and health is maintained through the balanced
interactions of cardiac generated blood flow and cross-talk between the cellular
components that comprise blood vessels. Central to this cross-talk is endothelial
generated nitric oxide (NO) that stimulates relaxation of the contractile
vascular smooth muscle (VSMC) layer of blood vessels. In cardiovascular disease
this balanced interaction is disrupted and NO signaling is lost. Work over the
last several years indicates that regulation of NO is much more complex than
previously believed. It is now apparent that the secreted protein
thrombospondin-1 (TSP1), that is upregulated in cardiovascular disease and animal
models of the same, on activating cell surface receptor CD47, redundantly
inhibits NO production and NO signaling. This inhibitory event has implications
for baseline and disease-related responses mediated by NO. Further work has
identified that TSP1-CD47 signaling stimulates enzymatic reactive oxygen species
(ROS) production to further limit blood flow and promote vascular disease. Herein
consideration is given to the most recent discoveries in this regard which
identify the TSP1-CD47 axis as a major proximate governor of cardiovascular
health.