Gene expression profiles generated from skeletal muscle biopsies taken from participants of the HERITAGE family study. Participants completed an endurance training regime in which a skeletal muscle biopsy was taken prior to the start and after the final session of the program. Biopsies were used to generate Affymetrix gene expression microarrays.
The Role of Eif6 in Skeletal Muscle Homeostasis Revealed by Endurance Training Co-expression Networks.
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View SamplesGlaucoma is a common ocular disorder that is a leading cause of blindness worldwide. It is characterized by the dysfunction and loss of retinal ganglion cells (RGCs). Although many studies have implicated various molecules in glaucoma, no mechanism has been shown to be responsible for the earliest detectable damage to RGCs and their axons in the optic nerve. Here, we show that the leukocyte transendothelial migration pathway is activated in the optic nerve head at the earliest stages of disease in an inherited mouse model of glaucoma. This resulted in proinflammatory monocytes entering the optic nerve prior to detectable neuronal damage. A 1-time x-ray treatment prevented monocyte entry and subsequent glaucomatous damage. A single x-ray treatment of an individual eye in young mice provided that eye with long-term protection from glaucoma but had no effect on the contralateral eye. Localized radiation treatment prevented detectable neuronal damage and dysfunction in treated eyes, despite the continued presence of other glaucomatous stresses and signaling pathways. Injection of endothelin-2, a damaging mediator produced by the monocytes, into irradiated eyes, combined with the other glaucomatous stresses, restored neural damage with a topography characteristic of glaucoma. Together, these data support a model of glaucomatous damage involving monocyte entry into the optic nerve. Genome-wide assessment of gene expression changes was performed in DBA/2J-Gpnmb+, DBA/2J mice and irradiated DBA/2J mice at 8.5 and 10.5 months of age.
Radiation treatment inhibits monocyte entry into the optic nerve head and prevents neuronal damage in a mouse model of glaucoma.
Sex
View SamplesWith this study we wanted to evaluate the impact of murine norovirus infection of germfree mice and to compare it to germfree mice which have received fecal transplants of conventional mice. Overall design: whole small intestinal tissue analysis of 3 germfree, 3 germfree mice infected with murine norovirus and 3 conventionalized germfree mice
An enteric virus can replace the beneficial function of commensal bacteria.
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View SamplesNod2 has been extensively characterized as a bacterial sensor that induces an antimicrobial and inflammatory gene expression program. Therefore, it is unclear why Nod2 mutations that disrupt bacterial recognition are paradoxically among the highest risk factors for Crohns disease, which involves an exaggerated immune response directed at intestinal bacteria. Previous studies from our lab have shown that mice deficient in Atg16L1, another Crohns disease susceptibility gene, develop abnormalities in Paneth cells, specialized epithelial cells in the small intestine involved in antimicrobial responses.
Bacterial sensor Nod2 prevents inflammation of the small intestine by restricting the expansion of the commensal Bacteroides vulgatus.
Age, Specimen part
View SamplesIslet amyloid polypeptide (IAPP) is the main component of amyloid deposits in type 2 diabetic patients. Cells overexpressing the human transcript of IAPP (hIAPP) present defects in insulin secretion.
Inhibition of BACE2 counteracts hIAPP-induced insulin secretory defects in pancreatic β-cells.
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View SamplesTranscriptional profile of monocytes in the colon in response to C. rodentium infection Overall design: Eight samples have been analyzed. All are from Cd11b+Ly6C+ inflammatory monocytes sorted from colonic tissue 9 days after C. rodentium infection from Atg16L1HM(4) and WT(4) mice.
Autophagy proteins suppress protective type I interferon signalling in response to the murine gut microbiota.
Age, Specimen part, Subject
View SamplesFollowing skeletal muscle injury, muscle stem cells (satellite cells) are activated, proliferate, and differentiate to form myofibers. We show that mRNA decay protein AUF1 regulates satellite cell function through targeted degradation of specific mRNAs. AUF1 targets certain mRNAs containing 3 AU-rich elements (AREs) for rapid decay. Auf1-/- (KO) mice undergo accelerated skeletal muscle wasting with age and impaired muscle repair following injury. Satellite cell mRNA analysis and regeneration studies demonstrate that auf1-/- satellite cell self-renewal is impaired due to increased stability and overexpression of ARE-mRNAs. Control of ARE-mRNA decay by AUF1 and potentially other ARE-binding proteins represents a mechanism for adult stem cell regulation and is implicated in human muscle wasting diseases. We report the RNA transcript expression profiles from sorted satellite cells isolated from wild type (WT) and AUF1-null (KO) mice hindlimb muscles Overall design: Examination of RNA transcript expression from satellite cells of two genotypes Please note that mice are bred through a C57BL/6 strain of 129 background.
Targeted mRNA Decay by RNA Binding Protein AUF1 Regulates Adult Muscle Stem Cell Fate, Promoting Skeletal Muscle Integrity.
Age, Specimen part, Subject
View SamplesMetformin reduces the incidence of cancer in diabetics or in animal models. At the cellular level, the effects of metformin include the inhibition of complex I of the mitochondrial electron transport chain, a reduction in ATP levels and the activation of the energy sensor AMP kinase. Metformin also prevents the production of reactive oxygen species in primary human cells expressing oncogenic ras and the DNA damage associated to the process.
Metformin inhibits the senescence-associated secretory phenotype by interfering with IKK/NF-κB activation.
Sex, Specimen part, Treatment
View SamplesMethamphetamine (METH) is an illicit drug which is neurotoxic to the mammalian brain. Numerous studies have revealed significant decreases in dopamine and serotonin levels in the brains of animals exposed to moderate-to-large METH doses given within short intervals of time. In contrast, repeated injections of small nontoxic doses of the drug followed by a challenge with toxic METH doses afford significant protection against monoamine depletion. The present study was undertaken to test the possibility that repeated injections of the drug might be accompanied by transcriptional changes involved in rendering the nigrostriatal dopaminergic system refractory to METH toxicity. Our results confirm that METH preconditioning can provide significant protection against METH-induced striatal dopamine depletion. In addition, the presence and absence of METH preconditioning were associated with substantial differences in the identity of the genes whose expression was affected by a toxic METH challenge.
Methamphetamine preconditioning alters midbrain transcriptional responses to methamphetamine-induced injury in the rat striatum.
Sex, Age, Specimen part, Treatment
View SamplesWe performed the whole transcriptome analysis in Zscan4 positive ES cells (Em+) and Zscan4 negative ES cells (Em-) by using FACS-sorted MC1-ZE7 ES cells. Overall design: Whole RNA-seq in Zscan4 positive and negative cells
Transient bursts of Zscan4 expression are accompanied by the rapid derepression of heterochromatin in mouse embryonic stem cells.
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