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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Acta+Physiol+(Oxf)
2017 ; 220
(1
): 72-82
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Desoxycorticosterone pivalate-salt treatment leads to non-dipping hypertension in
Per1 knockout mice
#MMPMID27636900
Solocinski K
; Holzworth M
; Wen X
; Cheng KY
; Lynch IJ
; Cain BD
; Wingo CS
; Gumz ML
Acta Physiol (Oxf)
2017[May]; 220
(1
): 72-82
PMID27636900
show ga
AIM: Increasing evidence demonstrates that circadian clock proteins are important
regulators of physiological functions including blood pressure. An established
risk factor for developing cardiovascular disease is the absence of a blood
pressure dip during the inactive period. The goal of the present study was to
determine the effects of a high salt diet plus mineralocorticoid on PER1-mediated
blood pressure regulation in a salt-resistant, normotensive mouse model,
C57BL/6J. METHODS: Blood pressure was measured using radiotelemetry. After
control diet, wild-type (WT) and Per1 (KO) knockout mice were given a high salt
diet (4% NaCl) and the long-acting mineralocorticoid deoxycorticosterone
pivalate. Blood pressure and activity rhythms were analysed to evaluate changes
over time. RESULTS: Blood pressure in WT mice was not affected by a high salt
diet plus mineralocorticoid. In contrast, Per1 KO mice exhibited significantly
increased mean arterial pressure (MAP) in response to a high salt diet plus
mineralocorticoid. The inactive/active phase ratio of MAP in WT mice was
unchanged by high salt plus mineralocorticoid treatment. Importantly, this
treatment caused Per1 KO mice to lose the expected decrease or 'dip' in blood
pressure during the inactive compared to the active phase. CONCLUSION: Loss of
PER1 increased sensitivity to the high salt plus mineralocorticoid treatment. It
also resulted in a non-dipper phenotype in this model of salt-sensitive
hypertension and provides a unique model of non-dipping. Together, these data
support an important role for the circadian clock protein PER1 in the modulation
of blood pressure in a high salt/mineralocorticoid model of hypertension.