Gene Expression in Iron-Deficient Rat Duodenum
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ABSTRACT:
ORGANISM(S): Rattus norvegicus
PROVIDER: GSE1892 | GEO | 2005/01/26
SECONDARY ACCESSION(S): PRJNA90533
REPOSITORIES: GEO
Similar Datasets
Project description:The effect of iron-deficiency on duodenal gene expression was investigated in rats at different developmental stages.
2007-09-15 | E-GEOD-1892 | biostudies-arrayexpress
Project description:In the present study, we examined duodenal gene expression in rats subjected to immobilization, to elucidate the mechanism of the stress response in the duodenum. Keywords: stress response
2007-03-09 | GSE4426 | GEO
Project description:Iron is an essential nutritional element; its deficiency in the body causes nutritional problems and a decrease in iron storage that can lead to anemia. The liver not only stores iron but is an important metabolic target as well. Dietary iron deficiency is associated with changes in the metabolism of nutrients such as lipids. However, to the best of our knowledge, a global analysis detailing the consequences of iron deficiency in the body has not yet been reported. We performed a comprehensive transcriptome analysis using DNA microarray technology to reveal the effects of iron deficiency on hepatic gene expression. Four-week-old rats were fed an iron-deficient diet or a control diet for 16 days. On day 17, the rats were sacrificed under anesthesia, and their livers were dissected for DNA microarray analysis. We identified 600 up-regulated and 500 down-regulated probe sets to characterize the iron-deficient diet group. The up-regulated probe sets contained genes for enzymes that are involved in cholesterol, amino acid, and glucose metabolisms, as well as in apoptosis. The down-regulated probe sets included genes for enzymes associated with lipid metabolism. Additionally, the 16-day iron-deficient diet induced anemia. Our gene expression analysis revealed that, as a result, cholesterol biosynthesis, gluconeogenesis, and apoptosis due to endoplasmic reticulum stress were accelerated, while fatty acid biosynthesis was suppressed by dietary iron deficiency. Our analysis also showed that cholesterol metabolism, including bile acid biosynthesis, was accelerated in the initial stages of cholesterol accumulation. Experiment Overall Design: Male 3-week-old Sprague Dawley rats were purchased from Charles River Japan (Kanagawa, Japan) and housed in a room conditioned at 24 ± 1°C and 40 ± 5% humidity with a 12-h light-dark cycle (lights on at 08:00). The rats were given a control diet and water for 24 h ad libitum. Diets for rats were obtained from Research Diets, Inc. (New Brunswick, NJ, USA). The composition of the control diet was based on the AIN93G diet , except that cellulose was replaced by Avicel, since cellulose is an ingredient of variable iron content. The iron-deficient diet was prepared by removal of iron (ferric citrate) from the control diet. At day 8, rats were divided into two groups comprising animals of similar body weights. One group (n = 6) was fed the control diet and the other group (n = 7) was fed the iron-deficient diet (iron-deficient diet group). After iron-deficient diet feeding was started, blood hemoglobin levels were measured every two days. Blood samples for hemoglobin measurements were collected from the tail vein, and hemoglobin levels were measured by using the Wako Hemoglobin B test (Wako Pure Chemical Industries, Osaka, Japan). On day 12 of the iron-deficient diet treatment, diets were removed at 17:00, and feeding was conducted between 09:00 and 17:00 for another 4 days. This protocol was intended to synchronize the ratsâ feeding behavior. On day 17 of the iron-deficient diet treatment, rats were fed for 1.5 h prior to sacrifice under anesthesia. Livers were then excised and subsequently immersed in RNAlater (Applied Biosystems Japan, Tokyo, Japan). Blood hemoglobin level of rats fed an iron-deficient diet decreased significantly over the course of the feeding. On day 17, the hemoglobin level in the iron-deficient diet group was 42% of that of the control diet group (P < 0.01).
2009-07-11 | E-GEOD-16899 | biostudies-arrayexpress
Project description:Iron is an essential nutritional element; its deficiency in the body causes nutritional problems and a decrease in iron storage that can lead to anemia. The liver not only stores iron but is an important metabolic target as well. Dietary iron deficiency is associated with changes in the metabolism of nutrients such as lipids. However, to the best of our knowledge, a global analysis detailing the consequences of iron deficiency in the body has not yet been reported. We performed a comprehensive transcriptome analysis using DNA microarray technology to reveal the effects of iron deficiency on hepatic gene expression. Four-week-old rats were fed an iron-deficient diet or a control diet for 16 days. On day 17, the rats were sacrificed under anesthesia, and their livers were dissected for DNA microarray analysis. We identified 600 up-regulated and 500 down-regulated probe sets to characterize the iron-deficient diet group. The up-regulated probe sets contained genes for enzymes that are involved in cholesterol, amino acid, and glucose metabolisms, as well as in apoptosis. The down-regulated probe sets included genes for enzymes associated with lipid metabolism. Additionally, the 16-day iron-deficient diet induced anemia. Our gene expression analysis revealed that, as a result, cholesterol biosynthesis, gluconeogenesis, and apoptosis due to endoplasmic reticulum stress were accelerated, while fatty acid biosynthesis was suppressed by dietary iron deficiency. Our analysis also showed that cholesterol metabolism, including bile acid biosynthesis, was accelerated in the initial stages of cholesterol accumulation.
2010-04-22 | GSE16899 | GEO
Project description:Microarray analysis of pancreatic tissue comparing gene expression in rats fed an iron deficient or iron loaded diet vs. iron adequate diet. Goal was to determine changes in gene expression in response to iron status.
2013-02-27 | GSE44699 | GEO
Project description:Iron is an essential cellular and important for many physiological functions including erythropoiesis and host defense. It is taken up from the diet in the duodenum, the first part of the small intestine by enterocytes and loaded onto transferrin, the main iron transport molecules in the circulation. Macrophages are ancient sentinel cells that are implicated in all steps of systemic iron metabolism except duodenal iron import. By assessing mice that harbor a macrophage-specific deletion of the tuberous sclerosis complex 2 (Tsc2), a negative regulator of mTORC1, we found that these mice possessed various defects in iron metabolism including defective steady state erythropoiesis and a highly reduced saturation of transferrin with iron. This iron-deficiency phenotype was caused by a block of iron import from the duodenal epithelial cells into the circulation. Activation of mTORC1 in villous duodenal CD68+ macrophages induced expression of serine proteases and promoted local degradation of the major iron transport molecule transferrin, whereas depletion of macrophages in mice increased transferrin levels in the duodenal villi. Inhibition of serine protease activity restored transferrin levels in the Tsc2-deficient mice. Physiologically, transferrin levels were regulated in the villi during Citrobacter rodentium infection in mice. These data show that transferrin is controlled locally in the duodenum and establish macrophages as regulators of duodenal iron uptake.
2023-06-08 | GSE196815 | GEO
Project description:Iron is an essential cellular trace element and important for many physiological functions including erythropoiesis and host defense. It is taken up from the diet in the duodenum, the first part of the small intestine by enterocytes and loaded onto transferrin, the main iron transport molecules in the circulation. Macrophages are ancient sentinel cells that are implicated in all steps of systemic iron metabolism except duodenal iron import. By assessing mice that harbor a macrophage-specific deletion of the tuberous sclerosis complex 2 (Tsc2), a negative regulator of mTORC1, we found that these mice possessed various defects in iron metabolism including defective steady state erythropoiesis and a highly reduced saturation of transferrin with iron. This iron-deficiency phenotype was caused by a block of iron import from the duodenal epithelial cells into the circulation. Activation of mTORC1 in villous duodenal CD68+ macrophages induced expression of serine proteases and promoted local degradation of the major iron transport molecule transferrin, whereas depletion of macrophages in mice increased transferrin levels in the duodenal villi. Inhibition of serine protease activity restored transferrin levels in the Tsc2-deficient mice. Physiologically, transferrin levels were regulated in the villi during Citrobacter rodentium infection in mice. These data show that transferrin is controlled locally in the duodenum and establish macrophages as regulators of duodenal iron uptake.
2023-06-08 | GSE197175 | GEO
Project description:Microarray analysis of pancreatic tissue comparing gene expression in rats fed an iron deficient or iron loaded diet vs. iron adequate diet. Goal was to determine changes in gene expression in response to iron status. 2 separate two-condition experiments: iron deficient (FeD) vs. iron adequate (FeA), and iron overload (FeO) vs. iron adequate (FeA). Performed in dye-switched duplicates. Samples pooled (n=6).
2013-02-27 | E-GEOD-44699 | biostudies-arrayexpress
Project description:Iron deficiency-induced anemia is generally a representative nutritional problem in most populations. We reported that the anemia due to dietary iron deficiency causes a variety of changes in nutrient metabolism, even leading to apoptosis as a result of associated endoplasmic reticulum (ER) stress in the rat liver. On the other hand, it appears that non-anemic iron-deficiency causes no serious problem because no appreciable down-regulation of hemoglobin synthesis occurs. Biochemically, iron is essential for activation of cytochrome-related enzymes and its deficiency should yield some physiological problems. We performed a comprehensive transcriptome analysis to define the effects of non-anemic iron deficiency on hepatic gene expression. Four-week-old rats were fed a low-iron diet (ca. 3 ppm iron) for 2 days. These rats were compared with those fed a control diet (48 ppm iron) by pair feeding. On day 3, the rats were sacrificed under anesthesia, and their livers were dissected for DNA microarray analysis. Rats in the iron-deficient diet group, showed that their serum ferritin and iron levels decreased with an increase in the serum total iron binding capacity (TIBC) level, while the hemoglobin level was not changed. In the DNA microarray study, we identified 91 up-regulated and 186 down-regulated probe sets that characterized the iron-deficient diet group. In the up-regulated probe sets, genes involved in glucose and lipid metabolic processes were significantly enriched, whereas genes related to organic acid metabolic process, cellular ketone metabolic process, lipid metabolic process, oxidation reduction, response to drug, response to extracellular stimulus and gas transport were significantly enriched in the down-regulated probe sets. These results suggest that even the non-anemic iron-deficiency exerts various influences on nutrient metabolisms in the liver.
2013-03-21 | GSE30533 | GEO
Project description:Iron-related disorders are among the most prevalent diseases worldwide. Systemic iron homeostasis requires hepcidin (Hamp), a hepatic-derived hormone that controls iron mobilization through its molecular target, ferroportin (FPN), the only known mammalian iron exporter. Here, we took a transcriptomic approach to to compare the duodenal transcriptome during systemic iron demand to that of hepcidin-deficiency iron overload. Hampfl/fl (control) and AlbCreERT2;Hampfl/fl mice were placed on iron-replete and low-iron diets and were sacrificed two weeks following tamoxifen treatment. Duodenum RNA expression was compared across genotypes and across iron-replete and low iron diets.
2018-12-12 | E-MTAB-7329 | biostudies-arrayexpress