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Triiodothyronine Treatment: Effects on vastus lateralis skeletal muscle

ABSTRACT: Healthy men received 75 5g/d of T3 for 14 days. Microbiopsies of vastus lateralis skeletal muscle were performed before and after the treatment. For microarray experiments, we used samples from five subjects. After amplification of total RNA (Wang et al. 2000a), fluorescently labeled cDNA was prepared from each experimental sample. For each subject, probes from basal and T3 treatment conditions labeled with cyanine (Cy) 3 or Cy5 dyes were hybridized to cDNA microarray. After a filtering procedure to eliminate bad-quality spots and background correction, log2 transformed data for each experiment were normalized and centered to the mean. Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Keywords: Logical Set

ORGANISM(S): Homo sapiens

PROVIDER: GSE3462 | GEO | 2005/10/18

SECONDARY ACCESSION(S): PRJNA104821

REPOSITORIES: GEO

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Project description:Biochemical purification: Five grams of adult flies or 2.5 g of embryos were used in each affinity purification. Flies or embryos were suspended in 15 ml of buffer B (buffer A plus 1.5 mM dithiothreitol [DTT], 1 mM phenylmethylsulfonylfluoride [PMSF], 0.5 5g/ml leupeptin, 0.8 5g/ml pepstatin, 20 U/ml DNase I, 100 U/ml RNasin [Promega], and 0.2 mg/ml heparin) in a mortar filled with liquid nitrogen and ground with a pestle to a fine powder. The powder was transferred to a glass-dounce, thawed and dounced until the pestle reached the bottom. The suspension was centrifuged twice at 40C and 10,000 g for 10 min. The fat layer on top was aspirated off after each centrifugation. Cleared extract (12.5 ml) was incubated with 600 5l of a slurry (50% [v/v]) of IgG-agarose beads (Sigma) for 90 min at 4C. The beads were washed once with buffer B for 15 min at 4C, and three times for 15 min at 4C with buffer C (20 mM TrisHCl [pH 8.0], 150 mM NaCl, 1 mM EDTA [pH 8.0], 10% glycerol, 0.01% NP-40, 1 mM DTT, 10 U/ml RNasin). PumHD was released from beads by incubation with 150 Units of AcTEV protease (Invitrogen) for 2 hr at room temperature (RT). RNA was isolated from extracts and from the TEV eluates with TRIZOL reagent (Invitrogen) followed by RNeasy Mini-Kit (Qiagen) purification according to the manufacturer's instructions. Microarray analysis: A pool of four control cDNAs (2 ng of each flp, gal4, lacZ and -Gal) was added to each RNA sample prior to labeling as controls for the labeling procedure. Total RNA (12 5g) derived from the extract and 300 ng or 30% of the affinity-isolated RNA were labeled with Cy3 and Cy5 fluorescent dyes, respectively, following cDNA synthesis with amino-allyl dUTP in addition to the four natural dNTPs using a 1:1 mixture of oligo(dT) and random nonamer primers. The Cy3- and Cy5-labeled cDNA samples were mixed and hybridized to Drosophila DNA microarrays. An all pairs experiment design type is where all labeled extracts are compared to every other labeled extract. Keywords: RNA IP

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Triiodothyronine Treatment: Effects on vastus lateralis skeletal muscle

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