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2013 ; 113
(9
): 1087-1096
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Brain angiotensin-converting enzyme type 2 shedding contributes to the
development of neurogenic hypertension
#MMPMID24014829
Xia H
; Sriramula S
; Chhabra KH
; Lazartigues E
Circ Res
2013[Oct]; 113
(9
): 1087-1096
PMID24014829
show ga
RATIONALE: Overactivity of the brain renin-angiotensin system is a major
contributor to neurogenic hypertension. Although overexpression of
angiotensin-converting enzyme type 2 (ACE2) has been shown to be beneficial in
reducing hypertension by transforming angiotensin II into angiotensin-(1-7),
several groups have reported decreased brain ACE2 expression and activity during
the development of hypertension. OBJECTIVE: We hypothesized that ADAM17-mediated
ACE2 shedding results in decreased membrane-bound ACE2 in the brain, thus
promoting the development of neurogenic hypertension. METHODS AND RESULTS: To
test this hypothesis, we used the deoxycorticosterone acetate-salt model of
neurogenic hypertension in nontransgenic and syn-hACE2 mice overexpressing ACE2
in neurons. Deoxycorticosterone acetate-salt treatment in nontransgenic mice led
to significant increases in blood pressure, hypothalamic angiotensin II levels,
inflammation, impaired baroreflex sensitivity, and autonomic dysfunction, as well
as decreased hypothalamic ACE2 activity and expression, although these changes
were blunted or prevented in syn-hACE2 mice. In addition, reduction of ACE2
expression and activity in the brain paralleled an increase in ACE2 activity in
the cerebrospinal fluid of nontransgenic mice after deoxycorticosterone
acetate-salt treatment and were accompanied by enhanced ADAM17 expression and
activity in the hypothalamus. Chronic knockdown of ADAM17 in the brain blunted
the development of hypertension and restored ACE2 activity and baroreflex
function. CONCLUSIONS: Our data provide the first evidence that ADAM17-mediated
shedding impairs brain ACE2 compensatory activity, thus contributing to the
development of neurogenic hypertension.
|*Blood Pressure/drug effects
[MESH]
|*Renin-Angiotensin System/drug effects
[MESH]
|ADAM Proteins/genetics/metabolism
[MESH]
|ADAM17 Protein
[MESH]
|Angiotensin II Type 1 Receptor Blockers/pharmacology
[MESH]