Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling by array of human HepG2/C3A cells cultured in complete or leucine-devoid medium

ABSTRACT: HepG2/C3A cells cultured for 42 h in complete or leucine-devoid medium Experiment Overall Design: Total of 6 Samples (Leu vs noLeu)

ORGANISM(S): Homo sapiens

SUBMITTER: Wei Wang

PROVIDER: E-GEOD-13142 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Gene expression and integrated stress response in HepG2/C3A cells cultured in amino acid deficient medium.

Sikalidis Angelos K AK Lee Jeong-In JI Stipanuk Martha H MH

Amino acids 20100402 1

The integrated stress response (ISR), a defense mechanism cells employ when under stress (e.g., amino acid deprivation), causes suppression of global protein synthesis along with the paradoxical increased expression of a host of proteins that are useful in combating various stresses. Genes that were similarly differentially expressed under conditions of either leucine- or cysteine-depletion were identified. Many of the genes known to contain an amino acid response element and to be induced in re ...[more]

PMID: 20361218

Publication: 1/2

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Project description:Skeletal muscle atrophy is dictated by the balance between protein synthesis and protein breakdown, known as proteostasis. With advanced age, muscle atrophy contributes to development of co-morbidities, loss of strength and independence, and all-cause mortality. Aging also coincides with the accumulation of senescent cells within skeletal muscle that produce inflammatory products, known as the senescence associated secretory phenotype. Previously, we found that a metformin + leucine (MET+LEU) combination treatment had synergistic effects in aged mice to improve skeletal muscle structure and function during disuse atrophy. Therefore, the objective of this study was to determine the mechanisms by which MET+LEU exhibits muscle atrophy protection in vitro and if this occurs through cellular senescence. C2C12 myoblasts differentiated into myotubes were used to determine MET+LEU mechanisms during serum-deprivation (SD) atrophy. Single myofibers were isolated from aged (22-23 mo) C57Bl6/J mice, and human primary myoblasts were extracted from a healthy older adult donor. 25 + 125 µM MET+LEU treatment increased differentiation of myotubes and prevented SD induced atrophy. Low concentration (0.1 + 0.5 µM) MET+LEU had unique effects to prevent myotube atrophy and cause transcriptional reprogramming compared to individual therapies. SD increased inflammatory and cellular senescence pathways that was reversed with MET+LEU treatment. SD resulted in dysregulated proteostasis that was rescued with MET+LEU, and proteasome inhibition with MG-132 also rescued myotube atrophy. Cellular senescence transcriptional pathways and markers increased by SD were reversed with MET+LEU treatment, and dasatinib + quercetin (D+Q) senolytic treatment prevented myotube atrophy similar to MET+LEU. In aged myofibers, MET+LEU prevented SD atrophy, and in human primary myotubes MET+LEU prevented reductions in myonuclei fusion. These data provide evidence that MET+LEU has muscle cell intrinsic properties to prevent atrophy by reversing senescence and improving proteostasis

Dataset Information

Transcription profiling by array of human HepG2/C3A cells cultured in complete or leucine-devoid medium

Publications

Gene expression and integrated stress response in HepG2/C3A cells cultured in amino acid deficient medium.

Similar Datasets

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