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Skeletal muscle gene expression in WT C57BL/6 versus TLR2-/- mice

ABSTRACT: WT C57BL/6 and TLR2-/- mice were used in this study. TLR2-/- mice were on a C57BL/6 background and were kindly provided by Dr S. Akira (Osaka University, Osaka, Japan). WT C57BL/6 mice were purchased from Charles River Laboratories (Wilminton, MA, USA). All the mice used in this study were males and more than 7 weeks old. Animals were kept and bred at Karolinska Institutet animal facility in a specific pathogen-free environment with standard room temperature and a 12-12 hour light/dark cycle. Food and water were provided ad libitum. Mice were killed by rapid neck disarticulation and the flexor digitorum brevis muscles were removed.

ORGANISM(S): Mus musculus

PROVIDER: GSE103337 | GEO | 2017/09/01

SECONDARY ACCESSION(S): PRJNA401697

REPOSITORIES: GEO

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Project description:Background: Niemann-Pick disease type A (NPDA), a disease caused by mutations in acid sphingomyelinase (ASM), involves severe neurodegeneration and early death. Intracellular lipid accumulation and plasma membrane alterations are implicated in the pathology. ASM is also linked to the mechanism of plasma membrane repair, so we investigated the impact of ASM deficiency in skeletal muscle, a tissue that undergoes frequent cycles of injury and repair in vivo. Methods: Utilizing the NPDA/B mouse model ASM−/− and wild type (WT) littermates, we performed excitation- contraction coupling/Ca2+ mobilization and sarcolemma injury/repair assays with isolated flexor digitorum brevis fibers, proteomic analyses with quadriceps femoris, flexor digitorum brevis, and tibialis posterior muscle and in vivo tests of the contractile force (maximal isometric torque) of the quadriceps femoris muscle before and after eccentric contraction-induced muscle injury. Results: ASM−/− flexor digitorum brevis fibers showed impaired excitation-contraction coupling compared to WT, a defect expressed as reduced tetanic [Ca2+]i in response to electrical stimulation and early failure in sustaining [Ca2+]i during repeated tetanic contractions. When injured mechanically by needle passage, ASM−/− flexor digitorum brevis fibers showed susceptibility to injury similar to WT, but a reduced ability to reseal the sarcolemma. Proteomic analyses revealed changes in a small group of skeletal muscle proteins as a consequence of ASM deficiency, with downregulation of calsequestrin occurring in the three different muscles analyzed. In vivo, the loss in maximal isometric torque of WT quadriceps femoris was similar immediately after and 2 min after injury. The loss in ASM−/− mice immediately after injury was similar to WT, but was markedly larger at 2 min after injury. Conclusions: Skeletal muscle fibers from ASM−/− mice have an impairment in intracellular Ca2+ handling that results in reduced Ca2+ mobilization and a more rapid decline in peak Ca2+ transients during repeated contraction-relaxation cycles. Isolated fibers show reduced ability to repair damage to the sarcolemma, and this is associated with an exaggerated deficit in force during recovery from an in vivo eccentric contraction- induced muscle injury. Our findings uncover the possibility that skeletal muscle functional defects may play a role in the pathology of NPDA/B disease.

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Skeletal muscle gene expression in WT C57BL/6 versus TLR2-/- mice

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