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Local viral delivery of the IGF-I isoforms promoted muscle hypertrophy in young mice, and the effect was isoform- and age-dependent: in growing animals both IGF-IA and IGF-IB enlarged muscle, whereas in older (six-month) animals only IGF-IA produced significant hypertrophy, suggesting the bioavailability or receptor affinity of the IGF-IB isoform diminishes with age

doi: 10.3390/antibiotics13050392 116 PluznickJ

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189 During the maturation of RPE, PGC-1 increases the expression of antioxidant genes, including catalase (CAT), glutathione peroxidase (GPX)1, peroxiredoxin (PRDX) 3, SOD1, SOD2, and TXN2, and represses oxidant-mediated cell death in RPE