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Title

RANKL inhibition improves muscle strength and insulin sensitivity and restores bone mass

Authors
Douni, Eleni
Published in Journal of Clinical Investigation. 2019, vol. 129, no. 8, p. 3214-3223
Abstract Receptor activator of Nfkb ligand (RANKL) activates, while osteoprotegerin (OPG) inhibits, osteoclastogenesis. In turn a neutralizing Ab against RANKL, denosumab improves bone strength in osteoporosis. OPG also improves muscle strength in mouse models of Duchenne's muscular dystrophy (mdx) and denervation-induce atrophy, but its role and mechanisms of action on muscle weakness in other conditions remains to be investigated. We investigated the effects of RANKL inhibitors on muscle in osteoporotic women and mice that either overexpress RANKL (HuRANKL-Tg+), or lack Pparb and concomitantly develop sarcopenia (Pparb-/-). In women, denosumab over 3 years improved appendicular lean mass and handgrip strength compared to no treatment, whereas bisphosphonate did not. HuRANKL-Tg+ mice displayed lower limb force and maximal speed, while their leg muscle mass was diminished, with a lower number of type I and II fibers. Both OPG and denosumab increased limb force proportionally to the increase in muscle mass. They markedly improved muscle insulin sensitivity and glucose uptake, and decrease anti-myogenic and inflammatory gene expression in muscle, such as myostatin and protein tyrosine phosphatase receptor-γ. Similarly, in Pparb-/-, OPG increased muscle volume and force, while also normalizing their insulin signaling and higher expression of inflammatory genes in skeletal muscle. In conclusions, RANKL deteriorates, while its inhibitor improves, muscle strength and insulin sensitivity in osteoporotic mice and humans. Hence denosumab could represent a novel therapeutic approach for sarcopenia.
Keywords Bone BiologyBone diseaseMuscleMuscle BiologyOsteoporosis
Identifiers
PMID: 31120440
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Structures
Research group Génétique des ostéoporoses (544)
Projects FNS: 3100A0-116633/1
European Foundation for the Study of Diabetes and Foundation for Research in Osteoporosis and Bone Disease (ME10883)
Citation
(ISO format)
BONNET, Nicolas et al. RANKL inhibition improves muscle strength and insulin sensitivity and restores bone mass. In: Journal of Clinical Investigation, 2019, vol. 129, n° 8, p. 3214-3223. doi: 10.1172/JCI125915 https://archive-ouverte.unige.ch/unige:123821

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Deposited on : 2019-10-01

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