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2015 ; 308
(5
): R370-8
Nephropedia Template TP
Xia H
; de Queiroz TM
; Sriramula S
; Feng Y
; Johnson T
; Mungrue IN
; Lazartigues E
Am J Physiol Regul Integr Comp Physiol
2015[Mar]; 308
(5
): R370-8
PMID25519733
show ga
Endoplasmic reticulum (ER) stress was previously reported to contribute to
neurogenic hypertension while neuronal angiotensin-converting enzyme type 2
(ACE2) overexpression blunts the disease. To assess which brain regions are
important for ACE2 beneficial effects and the contribution of ER stress to
neurogenic hypertension, we first used transgenic mice harboring a floxed
neuronal hACE2 transgene (SL) and tested the impact of hACE2 knockdown in the
subfornical organ (SFO) and paraventricular nucleus (PVN) on deoxycorticosterone
acetate (DOCA)-salt hypertension. SL and nontransgenic (NT) mice underwent
DOCA-salt or sham treatment while infected with an adenoassociated virus (AAV)
encoding Cre recombinase (AAV-Cre) or a control virus (AAV-green fluorescent
protein) to the SFO or PVN. DOCA-salt-induced hypertension was reduced in SL
mice, with hACE2 overexpression in the brain. This reduction was only partially
blunted by knockdown of hACE2 in the SFO or PVN, suggesting that both regions are
involved but not essential for ACE2 regulation of blood pressure (BP). DOCA-salt
treatment did not increase the protein levels of ER stress and autophagy markers
in NT mice, despite a significant increase in BP. In addition, these markers were
not affected by hACE2 overexpression in the brain, despite a significant
reduction of hypertension in SL mice. To further assess the role of ER stress in
neurogenic hypertension, NT mice were infused intracerebroventricularlly with
tauroursodeoxycholic acid (TUDCA), an ER stress inhibitor, during DOCA-salt
treatment. However, TUDCA infusion failed to blunt the development of
hypertension in NT mice. Our data suggest that brain ER stress does not
contribute to DOCA-salt hypertension and that ACE2 blunts neurogenic hypertension
independently of ER stress.