TY - JOUR
T1 - Fast-twitch glycolytic skeletal muscle is predisposed to age-induced impairments in mitochondrial function
AU - Jacobs, Robert A
AU - Díaz, Víctor
AU - Soldini, Lavinia
AU - Haider, Thomas
AU - Thomassen, Martin
AU - Nordsborg, Nikolai B
AU - Gassmann, Max
AU - Lundby, Carsten
N1 - CURIS 2013 NEXS 100
PY - 2013/9
Y1 - 2013/9
N2 - The etiology of mammalian senescence is suggested to involve the progressive impairment of mitochondrial function; however, direct observations of age-induced alterations in actual respiratory chain function are lacking. Accordingly, we assessed mitochondrial function via high-resolution respirometry and mitochondrial protein expression in soleus, quadricep, and lateral gastrocnemius skeletal muscles, which represent type 1 slow-twitch oxidative muscle (soleus) and type 2 fast-twitch glycolytic muscle (quadricep and gastrocnemius), respectively, in young (10-12 weeks) and mature (74-76 weeks) mice. Electron transport through mitochondrial complexes I and III increases with age in quadricep and gastrocnemius, which is not observed in soleus. Mitochondrial coupling efficiency during respiration through complex I also deteriorates with age in gastrocnemius and shows a tendency (p = .085) to worsen in quadricep. These data demonstrate actual alterations in electron transport function that occurs with age and are dependent on skeletal muscle type.
AB - The etiology of mammalian senescence is suggested to involve the progressive impairment of mitochondrial function; however, direct observations of age-induced alterations in actual respiratory chain function are lacking. Accordingly, we assessed mitochondrial function via high-resolution respirometry and mitochondrial protein expression in soleus, quadricep, and lateral gastrocnemius skeletal muscles, which represent type 1 slow-twitch oxidative muscle (soleus) and type 2 fast-twitch glycolytic muscle (quadricep and gastrocnemius), respectively, in young (10-12 weeks) and mature (74-76 weeks) mice. Electron transport through mitochondrial complexes I and III increases with age in quadricep and gastrocnemius, which is not observed in soleus. Mitochondrial coupling efficiency during respiration through complex I also deteriorates with age in gastrocnemius and shows a tendency (p = .085) to worsen in quadricep. These data demonstrate actual alterations in electron transport function that occurs with age and are dependent on skeletal muscle type.
U2 - 10.1093/gerona/gls335
DO - 10.1093/gerona/gls335
M3 - Journal article
C2 - 23371970
SN - 1079-5006
VL - 68
SP - 1010
EP - 1022
JO - Journals of Gerontology. Series A: Biological Sciences & Medical Sciences
JF - Journals of Gerontology. Series A: Biological Sciences & Medical Sciences
IS - 9
ER -