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2015 ; 5
(ä): 10627
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A novel inhibitory mechanism of MRTF-A/B on the ICAM-1 gene expression in
vascular endothelial cells
#MMPMID26024305
Hayashi K
; Murai T
; Oikawa H
; Masuda T
; Kimura K
; Muehlich S
; Prywes R
; Morita T
Sci Rep
2015[May]; 5
(ä): 10627
PMID26024305
show ga
The roles of myocardin-related transcription factor A (MRTF-A) and MRTF-B in
vascular endothelial cells are not completely understood. Here, we found a novel
regulatory mechanism for MRTF-A/B function. MRTF-A/B tend to accumulate in the
nucleus in arterial endothelial cells in vivo and human aortic endothelial cells
(HAoECs) in vitro. In HAoECs, nuclear localization of MRTF-A/B was not
significantly affected by Y27632 or latrunculin B, primarily due to the reduced
binding of MRTF-A/B to G-actin and in part, to the low level of MRTF-A
phosphorylation by ERK. MRTF-A/B downregulation by serum depletion or
transfection of siRNA against MRTF-A and/or MRTF-B induced ICAM-1 expression in
HAoECs. It is known that nuclear import of nuclear factor-?B (NF-?B) plays a key
role in ICAM-1 gene transcription. However, nuclear accumulation of NF-?B p65 was
not observed in MRTF-A/B-depleted HAoECs. Our present findings suggest that
MRTF-A/B inhibit ICAM-1 mRNA expression by forming a complex with NF-?B p65 in
the nucleus. Conversely, downregulation of MRTF-A/B alleviates this negative
regulation without further translocation of NF-?B p65 into the nucleus. These
results reveal the novel roles of MRTF-A/B in the homeostasis of vascular
endothelium.