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2015 ; 46
(11
): 3285-7
Nephropedia Template TP
gab.com Text
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English Wikipedia
Acute Loss of miR-221 and miR-222 in the Atherosclerotic Plaque Shoulder
Accompanies Plaque Rupture
#MMPMID26451018
Bazan HA
; Hatfield SA
; O'Malley CB
; Brooks AJ
; Lightell D Jr
; Woods TC
Stroke
2015[Nov]; 46
(11
): 3285-7
PMID26451018
show ga
BACKGROUND AND PURPOSE: Atherosclerotic plaque vulnerability is accompanied by
changes in the molecular and cellular function in the plaque shoulder, including
a decrease in vascular smooth muscle cell proliferation. We aimed to determine
whether the expression of 3 miRNAs that regulate vascular smooth muscle cell
proliferation (miR-145, miR-221, and miR-222) is altered with plaque rupture,
suggesting a role in regulating plaque stability. METHODS: miRNAs were measured
in the plaque shoulder of carotid plaques obtained from patients undergoing
carotid endarterectomy (CEA) for 3 distinct clinical scenarios: (1) patients
without previous neurological events but high-grade carotid stenosis
(asymptomatic), (2) patients with an acute neurological event within 5 days of
the CEA (urgent), and (3) patients undergoing CEA>5 days after a neurological
event (symptomatic). RESULTS: Mean time from plaque rupture event to CEA was 2.4
days in the urgent group. The urgent group exhibited a significant decrease in
miR-221 and miR-222 expression in the plaque shoulder, whereas no significant
differences were seen in miR-145 across the 3 groups. Regression analysis
demonstrated a significant correlation between time from the neurological event
to CEA and increasing miR-221 and miR-222, but not miR-145. mRNA encoding
p27Kip1, a target of miR-221 and miR-222 that inhibits vascular smooth muscle
cell proliferation, was increased in the urgent group. CONCLUSIONS:
Atherosclerotic plaque rupture is accompanied by a loss of miR-221 and miR-222
and an increase in p27Kip1 mRNA expression in the plaque shoulder, suggesting an
association between these miRNAs and atherosclerotic plaque stability.