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2016 ; 6
(ä): 26291
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Nrf2/Keap1 system regulates vascular smooth muscle cell apoptosis for vascular
homeostasis: role in neointimal formation after vascular injury
#MMPMID27198574
Ashino T
; Yamamoto M
; Numazawa S
Sci Rep
2016[May]; 6
(ä): 26291
PMID27198574
show ga
Abnormal increases in vascular smooth muscle cells (VSMCs) in the intimal region
after a vascular injury is a key event in developing neointimal hyperplasia. To
maintain vascular function, proliferation and apoptosis of VSMCs is tightly
controlled during vascular remodeling. NF-E2-related factor 2 (Nrf2)/Kelch-like
ECH-associated protein 1 (Keap1) system, a key component of the oxidative stress
response that acts in maintaining homeostasis, plays an important role in
neointimal hyperplasia after a vascular injury; however, the role of Nrf2/Keap1
in VSMC apoptosis has not been clarified. Here we report that 14 days after
arterial injury in mice, TUNEL-positive VSMCs are detected in both the neointimal
and medial layers. These layers contain cells expressing high levels of Nrf2 but
low Keap1 expression. In VSMCs, Keap1 depletion induces features of apoptosis,
such as positive TUNEL staining and annexin V binding. These changes are
associated with an increased expression of nuclear Nrf2. Simultaneous Nrf2
depletion inhibits Keap1 depletion-induced apoptosis. At 14 days after the
vascular injury, Nrf2-deficient mice demonstrated fewer TUNEL-positive cells and
increased neointimal formation in the neointimal and medial areas. The results
suggest that the Nrf2/Keap1 system regulates VSMC apoptosis during neointimal
formation, thereby inhibiting neointimal hyperplasia after a vascular injury.
|*Apoptosis
[MESH]
|*Neointima
[MESH]
|Animals
[MESH]
|Cells, Cultured
[MESH]
|Female
[MESH]
|Homeostasis
[MESH]
|In Situ Nick-End Labeling
[MESH]
|Kelch-Like ECH-Associated Protein 1/*metabolism
[MESH]