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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 J+Cachexia+Sarcopenia+Muscle
2014 ; 5
(2
): 149-58
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The anabolic catabolic transforming agent (ACTA) espindolol increases muscle mass
and decreases fat mass in old rats
#MMPMID24272787
Pötsch MS
; Tschirner A
; Palus S
; von Haehling S
; Doehner W
; Beadle J
; Coats AJ
; Anker SD
; Springer J
J Cachexia Sarcopenia Muscle
2014[Jun]; 5
(2
): 149-58
PMID24272787
show ga
BACKGROUND: Sarcopenia, the age-related, progressive loss of skeletal muscle
mass, strength, and function, is a considerable socioeconomic burden by
increasing risks of falls, fractures, and frailty. Moreover, sarcopenic patients
are often obese and therapeutic options are very limited. METHODS: Here, we
assessed the efficacy of espindolol on muscle mass in 19-month-old male Wistar
Han rats (weight, 555?±?18 g), including safety issues. Rats were randomized to
treatment with 3 mg/kg/day espindolol (n?=?8) or placebo (n?=?14) for 31 days.
RESULTS: Placebo-treated rats progressively lost body weight (-15.5?±?7.2 g),
lean mass (-1.5?±?4.2 g), and fat mass (-15.6?±?2.7 g), while espindolol
treatment increased body weight (+8.0?±?6.1 g, p?0.05), particularly lean mass
(+43.4?±?3.5 g, p?0.001), and reduced fat mass further (-38.6?±?3.4 g,
p?0.001). Anabolic/catabolic signaling was assessed in gastrocnemius muscle.
Espindolol decreased proteasome and caspase-3 proteolytic activities by
approximately 50 % (all p?0.05). Western blotting showed a reduced expression
of key catabolic regulators, including NF?B, MuRF1, and LC-3 (all p?0.01). The
50- and 26-kDa forms of myostatin were downregulated fivefold and 20-fold,
respectively (both p?0.001). Moreover, 4E-BP-1 was reduced fivefold (p?0.01),
while phospho-PI3K was upregulated fivefold (p?0.001), although Akt expression
and phosphorylation were lower compared to placebo (all p?0.05). No regulation
of p38 and expression of ERK1/2 were observed, while phosphorylation of p38 was
reduced (-54 %, p?0.001) and ERK1/2 was increased (115 and 83 %, respectively,
both p?0.01). Espindolol did not affect cardiac function (echocardiography) or
clinical plasma parameters. CONCLUSION: Espindolol reversed the effects of
aging/sarcopenia, particularly loss of muscle mass and increased fat mass. Thus,
espindolol is an attractive candidate drug for the treatment of sarcopenia
patients.