Project description:Purpose of this experiment is to investigate whether Crebl2 is required for the transcriptional changes that happen upon rapamycin treatment in TSC2-/- p53-/- MEFs.
Project description:MicroRNA-1 (miR-1) is the most abundant miRNA in adult skeletal muscle. To determine the function of miR-1 in adult skeletal muscle, we generated an inducible, skeletal muscle-specific miR-1 knockout (KO) mouse. Integration of RNA-sequencing (RNA-seq) data from miR-1 KO muscle with Argonaute 2 enhanced crosslinking and immunoprecipitation sequencing (AGO2 eCLIP-seq) from human skeletal muscle identified miR-1 target genes involved with glycolysis and pyruvate metabolism. The loss of miR-1 in skeletal muscle induced cancer-like metabolic reprogramming, as shown by higher pyruvate kinase muscle isozyme M2 (PKM2) protein levels, which promoted glycolysis. Comprehensive bioenergetic and metabolic phenotyping combined with skeletal muscle proteomics and metabolomics further demonstrated that miR-1 KO induced metabolic inflexibility as a result of pyruvate oxidation resistance. While the genetic loss of miR-1 reduced endurance exercise performance in mice and in C. elegans, the physiological down-regulation of miR-1 expression in response to a hypertrophic stimulus in both humans and mice may cause a similar metabolic reprogramming that supports muscle cell growth. Taken together, these data identify a novel post-translational mechanism of adult skeletal muscle metabolism regulation mediated by miR-1.
Project description:Sarcopenia is the age-induced, progressive loss of skeletal muscle mass and function, which is accompanied by reduced muscle performance. Individuals with sarcopenia often become bedridden or dependent on a wheelchair, leading to decreased quality of life. In this study, to better understand changes in skeletal muscle during sarcopenia, we performed a microarray analysis of skeletal muscle in young (13-week-old) and aged (26-month-old) mice. The microarray data shows that expression of the enzymes related to glucose and polyamine metabolism were decreased in aged mice compared with young mice.
Project description:The expression of interferon-related genes was more enhanced in irradiated ATM-deficient mouse embryonic fibroblasts (MEFs) than in irradiated ATM wild-type MEFs.