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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 Am+J+Physiol+Heart+Circ+Physiol
2013 ; 305
(7
): H1068-79
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Inhibition of the late sodium current slows t-tubule disruption during the
progression of hypertensive heart disease in the rat
#MMPMID23873796
Aistrup GL
; Gupta DK
; Kelly JE
; O'Toole MJ
; Nahhas A
; Chirayil N
; Misener S
; Beussink L
; Singh N
; Ng J
; Reddy M
; Mongkolrattanothai T
; El-Bizri N
; Rajamani S
; Shryock JC
; Belardinelli L
; Shah SJ
; Wasserstrom JA
Am J Physiol Heart Circ Physiol
2013[Oct]; 305
(7
): H1068-79
PMID23873796
show ga
The treatment of heart failure (HF) is challenging and morbidity and mortality
are high. The goal of this study was to determine if inhibition of the late Na(+)
current with ranolazine during early hypertensive heart disease might slow or
stop disease progression. Spontaneously hypertensive rats (aged 7 mo) were
subjected to echocardiographic study and then fed either control chow (CON) or
chow containing 0.5% ranolazine (RAN) for 3 mo. Animals were then restudied, and
each heart was removed for measurements of t-tubule organization and Ca(2+)
transients using confocal microscopy of the intact heart. RAN halted left
ventricular hypertrophy as determined from both echocardiographic and cell
dimension (length but not width) measurements. RAN reduced the number of myocytes
with t-tubule disruption and the proportion of myocytes with defects in
intracellular Ca(2+) cycling. RAN also prevented the slowing of the rate of
restitution of Ca(2+) release and the increased vulnerability to rate-induced
Ca(2+) alternans. Differences between CON- and RAN-treated animals were not a
result of different expression levels of voltage-dependent Ca(2+) channel 1.2,
sarco(endo)plasmic reticulum Ca(2+)-ATPase 2a, ryanodine receptor type 2,
Na(+)/Ca(2+) exchanger-1, or voltage-gated Na(+) channel 1.5. Furthermore,
myocytes with defective Ca(2+) transients in CON rats showed improved Ca(2+)
cycling immediately upon acute exposure to RAN. Increased late Na(+) current
likely plays a role in the progression of cardiac hypertrophy, a key pathological
step in the development of HF. Early, chronic inhibition of this current slows
both hypertrophy and development of ultrastructural and physiological defects
associated with the progression to HF.