Rattus norvegicus
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ABSTRACT:
PROVIDER: PRJNA90675 | ENA |
REPOSITORIES: ENA
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Project description:14 days after a single subcutaneous monocrotaline (MCT) injection we isolated the left and right ventricles from wistar rats. Factor1: Comparison between control (CON), compensated hypertrophy (HYP), and decompensated hypertrophy (CHF). Factor2: Comparison between left ventricle (LV) and right ventricle (RV). Keywords: dose response
2004-08-18 | GSE1652 | GEO
Project description:Gene expression profiles during the development of compensated or decompensated hypertrophy during pressure overload
| PRJNA93809 | ENA
Project description:We recently introduced a modification of the established monocrotaline (MCT) model for pulmonary hypertension (PH) and subsequent right ventricular (RV) hypertrophy, which allows for the selective induction of either a compensate or decompensated RV hypertrophic phenotype within four weeks after a single subcutaneous MCT injection. Both doses of 30 or 80 mg/kg body weight lead to an intermediate phase of compensated RV hypertrophy (day 14-19), while the former dose leads to a stable compensated phenotype (HYP) and the latter dose progresses towards decompensated ventricular hypertrophy and RV failure (CHF) around day 25-28 (Buermans et. al, Physiological Genomics 2005). This model provides the unique opportunity to characterize the development of either hypertrophic phenotype during the very early stages after imposition of RV pressure overload remodeling, well before phenotypical differences have become apparent. This experiment series describes gene expression profiles, generated by spotted oligonucleotide microarrays, to characterize and compare the expression of ~4800 genes from the RV of HYP, CHF and time matched control rats at 10, 19 and 25 days after injections. RV samples were hybridized against a common reference pool, prepared from total RNA isolated from the interventricular septum wall from animals at day 19 and 25. Keywords: dose response x time course
2006-02-01 | GSE3675 | GEO
Project description:Transition from Compensated Hypertrophy to Systolic Heart Failure in the Spontaneously Hypertensive Rat
| PRJNA120823 | ENA
Project description:Few studies have assessed the patterns of parasite populations of rodents over a longitudinal gradient in Chile. In this work, the gastrointestinal helminthic fauna of invasive rodents in Chile was examined to assess the association between their presence/absence and abundance with latitude, host sex, and host body condition, and to assess the coexistence and correlation of the abundance between parasite species. Rodents were obtained from 20 localities between 33 and 43°S. Helminths were extracted from the gastrointestinal tract and identified morphologically. Overall, 13 helminth taxa were obtained. The most frequently identified parasite species was Heterakis spumosa, and the most abundant was Syphacia muris, while Physaloptera sp. was the most widely distributed. No locality presented with a coexistence that was different from that expected by chance, while the abundance of five helminthic species correlated with the abundance of another in at least one locality, most likely due to co-infection rather than interaction. Host sex was associated with parasite presence or abundance, and female sex-biased parasitism was notably observed in all cases. Body condition and latitude presented either a positive or negative association with the presence or abundance of parasites depending on the species. It is notable that the likely native Physaloptera sp. is widely distributed among invasive rodents. Further, gravid females were found, suggesting spillback of this species to the native fauna. The low frequency and abundance of highly zoonotic hymenolepid species suggest that rodents are of low concern regarding gastrointestinal zoonotic helminths.
| S-EPMC9277659 | biostudies-literature
Project description:A series of two color gene expression profiles obtained using Agilent 44K expression microarrays was used to examine sex-dependent and growth hormone-dependent differences in gene expression in rat liver. This series is comprised of pools of RNA prepared from untreated male and female rat liver, hypophysectomized (‘Hypox’) male and female rat liver, and from livers of Hypox male rats treated with either a single injection of growth hormone and then killed 30, 60, or 90 min later, or from livers of Hypox male rats treated with two growth hormone injections spaced 3 or 4 hr apart and killed 30 min after the second injection. The pools were paired to generate the following 6 direct microarray comparisons: 1) untreated male liver vs. untreated female liver; 2) Hypox male liver vs. untreated male liver; 3) Hypox female liver vs. untreated female liver; 4) Hypox male liver vs. Hypox female liver; 5) Hypox male liver + 1 growth hormone injection vs. Hypox male liver; and 6) Hypox male liver + 2 growth hormone injections vs. Hypox male liver. A comparison of untreated male liver and untreated female liver liver gene expression profiles showed that of the genes that showed significant expression differences in at least one of the 6 data sets, 25% were sex-specific. Moreover, sex specificity was lost for 88% of the male-specific genes and 94% of the female-specific genes following hypophysectomy. 25-31% of the sex-specific genes whose expression is altered by hypophysectomy responded to short-term growth hormone treatment in hypox male liver. 18-19% of the sex-specific genes whose expression decreased following hypophysectomy were up-regulated after either one or two growth hormone injections. Finally, growth hormone suppressed 24-36% of the sex-specific genes whose expression was up-regulated following hypophysectomy, indicating that growth hormone acts via both positive and negative regulatory mechanisms to establish and maintain the sex specificity of liver gene expression. For full details, see V. Wauthier and D.J. Waxman, Molecular Endocrinology (2008)
2008-05-24 | GSE11529 | GEO
Project description:miRNA-99 family diverges physiological cardiac hypertrophy to pathological cardiac hypertrophy
| PRJNA297403 | ENA
Project description:Right ventricular heart failure (RVF) associated with pulmonary hypertension (PH) is characterized by a distinct gene expression pattern when compared with functional compensatory hypertrophy. Carvedilol treatment after RVF has been established reduces right ventricle (RV) hypertrophy and improves the RV function. In addition, carvedilol treatment has been shown to alter the gene expression of select genes. We sought to identify, on a genome-wide basis, the effect of carvedilol on gene expression. RVF was induced in male Sprague-Dawley rats by the combination of VEGF-receptor blockade and chronic hypoxia; thereafter, one group was treated with carvedilol. RNA was isolated from the RV and subjected to microarray analysis. A prediction analysis of the carvedilol-treated RVs showed that carvedilol treated RVs most resembled in their expression pattern the RVF pattern. However, an analysis beyond the boundaries of the prediction set revealed a small set of genes associated with carvedilol reversal of RVF. Pathway analysis of this set of genes revealed expression changes of genes involved in cardiac hypertrophy, mitochondrial dysfunction, protein ubiquitination, and sphingolipid metabolism. Genes encoding proteins in the cardiac hypertrophy and protein ubiquitination pathways were downregulated in the RV by carvedilol, while genes encoding proteins in the mitochondrial dysfunction and sphingolipid metabolism pathways were upregulated by carvedilol.
2013-05-06 | GSE42579 | GEO