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2015 ; 65
(6
): 1341-8
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Brain endoplasmic reticulum stress mechanistically distinguishes the
saline-intake and hypertensive response to deoxycorticosterone acetate-salt
#MMPMID25895586
Jo F
; Jo H
; Hilzendeger AM
; Thompson AP
; Cassell MD
; Rutkowski DT
; Davisson RL
; Grobe JL
; Sigmund CD
Hypertension
2015[Jun]; 65
(6
): 1341-8
PMID25895586
show ga
Endoplasmic reticulum stress has become an important mechanism in hypertension.
We examined the role of endoplasmic reticulum stress in mediating the increased
saline-intake and hypertensive effects in response to deoxycorticosterone acetate
(DOCA)-salt. Intracerebroventricular delivery of the endoplasmic reticulum
stress-reducing chemical chaperone tauroursodeoxycholic acid did not affect the
magnitude of hypertension, but markedly decreased saline-intake in response to
DOCA-salt. Increased saline-intake returned after tauroursodeoxycholic acid was
terminated. Decreased saline-intake was also observed after
intracerebroventricular infusion of 4-phenylbutyrate, another chemical chaperone.
Immunoreactivity to CCAAT homologous binding protein, a marker of irremediable
endoplasmic reticulum stress, was increased in the subfornical organ and
supraoptic nucleus of DOCA-salt mice, but the signal was absent in control and
CCAAT homologous binding protein-deficient mice. Electron microscopy revealed
abnormalities in endoplasmic reticulum structure (decrease in membrane length,
swollen membranes, and decreased ribosome numbers) in the subfornical organ
consistent with endoplasmic reticulum stress. Subfornical organ-targeted
adenoviral delivery of GRP78, a resident endoplasmic reticulum chaperone,
decreased DOCA-salt-induced saline-intake. The increase in saline-intake in
response to DOCA-salt was blunted in CCAAT homologous binding protein-deficient
mice, but these mice exhibited a normal hypertensive response. We conclude that
(1) brain endoplasmic reticulum stress mediates the saline-intake, but not blood
pressure response to DOCA-salt, (2) DOCA-salt causes endoplasmic reticulum stress
in the subfornical organ, which when attenuated by GRP78 blunts saline-intake,
and (3) CCAAT homologous binding protein may play a functional role in
DOCA-salt-induced saline-intake. The results suggest a mechanistic distinction
between the importance of endoplasmic reticulum stress in mediating effects of
DOCA-salt on saline-intake and blood pressure.