5 Day Oral Study of A-998679 in Male Sprague Dawley Rats (liver)
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ABSTRACT:
ORGANISM(S): Rattus norvegicus
PROVIDER: GSE39525 | GEO | 2012/07/24
SECONDARY ACCESSION(S): PRJNA171030
REPOSITORIES: GEO
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Project description:Male Sprague-Dawley rats [Crl:CD®(SD)IGS BR], weighing ~250 g at study initiation were obtained from Charles River Laboratories, Inc. (Wilmington, MA). Rats were housed singly in ventilated, stainless steel, wire-bottom hanging cages and fed non-certified Rodent Chow (Harlan Labs, Madison, WI) and water ad libitum and acclimated for at least 5 days after arrival. Rats were randomly assigned to various treatment groups (3 rats/group) and were dosed once daily by oral gavage with vehicle (0.2% hydroxypropylmethylcellulose at a dose volume of 10 ml/kg) or with 30, 100, or 200 mg/kg of A-998679. All rats were fasted overnight after their last dose, weighed and sacrificed under isoflurane anesthesia. Liver and small intestine (jejunum) were flash frozen in liquid nitrogen and stored at −80°C until processing for gene expression profiling on the Affymetrix platform.
2012-08-04 | GSE39850 | GEO
Project description:Male Sprague-Dawley rats [Crl:CD®(SD)IGS BR], weighing ~250 g at study initiation were obtained from Charles River Laboratories, Inc. (Wilmington, MA). Rats were housed singly in ventilated, stainless steel, wire-bottom hanging cages and fed non-certified Rodent Chow (Harlan Labs, Madison, WI) and water ad libitum and acclimated for at least 5 days after arrival. Rats were randomly assigned to various treatment groups (3 rats/group) and were dosed once daily by oral gavage with vehicle (0.2% hydroxypropylmethylcellulose at a dose volume of 10 ml/kg) or with 30, 100, or 200 mg/kg of A-998679. All rats were fasted overnight after their last dose, weighed and sacrificed under isoflurane anesthesia. Liver and small intestine (jejunum) were flash frozen in liquid nitrogen and stored at −80°C until processing for gene expression profiling on the Affymetrix platform. total of 11 samples, 3 biological replicates (rats) from each of 3 treatments groups 1. vehicle control 2. 30mg/kg A-998679 3. 100mg/kg A-998679 and 2 biological replicates from treatment group 4. 200mg/kg A-998679
2012-08-03 | E-GEOD-39850 | biostudies-arrayexpress
Project description:Male Sprague-Dawley rats [Crl:CD®(SD)IGS BR], weighing ~250 g at study initiation were obtained from Charles River Laboratories, Inc. (Wilmington, MA). Rats were housed singly in ventilated, stainless steel, wire-bottom hanging cages and fed non-certified Rodent Chow (Harlan Labs, Madison, WI) and water ad libitum and acclimated for at least 5 days after arrival. Rats were randomly assigned to various treatment groups (3 rats/group) and were dosed once daily by oral gavage with vehicle (0.2% hydroxypropylmethylcellulose at a dose volume of 10 ml/kg) or with 30, 100, or 200 mg/kg of A-998679. All rats were fasted overnight after their last dose, weighed and sacrificed under isoflurane anesthesia. Liver and small intestine (jejunum) were flash frozen in liquid nitrogen and stored at −80°C until processing for gene expression profiling on the Affymetrix platform. total of 12 samples, 3 biological replicates (rats) from each of 4 treatments groups 1. vehicle control 2. 30mg/kg A-988679 3. 100mg/kg A-998679 4. 200mg/kg A-998679
2012-07-23 | E-GEOD-39525 | biostudies-arrayexpress
Project description:High levels of hepcidin, the main regulator of systemic iron metabolism leads to various diseases. Targeting hepcidin and lowering its concentration is a possible form of intervention in order to treat these diseases. High turnover rate of hepcidin is a major drawback of therapies directly targeting this peptide. We developed two monoclonal antibodies (mAbs) ABT-207 and h5F9-AM8 which inhibit hemojuvelin also known as repulsive guidance molecule c (RGMc) and downregulate hepcidin. After a single application of these antibodies hepcidin expression in liver and its concentration in serum were reduced. Serum iron increased for several weeks. The RGMc antibodies show a pronounced dose response relationship in rats with h5F9-AM8 having an IC50 (UIBC) of ~80 fold higher than ABT-207. When hepcidin levels were downregulated iron deposition in the liver was visible histologically one week post application. The anitbody-mediated iron deposition was not associated with any toxicologically relevant effect at the doses and timepoints evaluate. Iron depositions seen after 14 weekly treatments with ABT-207 were partially reversible in rats and in cynomolgus monkeys. Due to their long-lasting effects and excellent safety profile, both RGMc-blocking antibodies ABT-207 and h5F9-AM8 are favorable clinical candidates for diseases characterized by high serum hepcidin levels like anemia of chronic disease. Female Sprague-Dawley rats [Crl:CD®(SD)IGS BR], weighing ~200 g at study initiation were obtained from Charles River Laboratories, Inc. Rats were housed singly in ventilated, stainless steel, wire-bottom hanging cages, fed non-certified Rodent Chow and water ad libitum and acclimated for at least 5 days after arrival. Rats were randomly assigned to various treatment groups (5 rats/group) and were dosed once weekly by IV injection via tail vein with vehicle (30mM Histidine, 8% w/v Sucrose, pH6.0, + 0.02% Tween 80) or with 0.02, 0.2, or 20 mg/kg of RGMc antibody for a total of 4 doses. All rats were sacrificed under isoflurane anesthesia 24 hours after final dose. Liver and spleen waere flash frozen in liquid nitrogen and stored at 80°C until processing for gene expression profiling on the Affymetrix platform. total of 12 samples, 3 biological replicates (rats) from each of 4 treatments groups 1. vehicle control (30mM Histidine, 8% w/v Sucrose, pH6.0, + 0.02% Tween 80) 2. 0.02 mg/kg RGMC Ab 3. 0.2 mg/kg RGMC Ab 4. 20 mg/kg RGMC Ab; rats were dosed by IV injection via tail vein once weekly for 4 total doses, dose volume 2mL/kg/week
2014-11-14 | E-GEOD-63200 | biostudies-arrayexpress
Project description:The acute response four hours after a fat load of extra virgin olive oil was investigated using DNA microarrays. Hepatic gene expression was analysed in Wistar Rats. Male rats, weighing 250- 300 g (purchased from Charles River, Barcelona, Spain), were used for experiments. Rats, housed in sterile filter-top cages (3-4 per cage), were acclimatized in a room maintained at 20ºC with a 12-h light-dark cycle for 10 days, allowed ad libitum access to water and standard chow diet (Pascual S.A., Barcelona, Spain), and fasted for 18 h before experiments. Two study groups were established: a) The control group did not receive any fat meal. The other group was fed 5 ml of olive oil (Aceites Toledo, Spain) as a bolus and sacrificed 4 hours after the feeding, respectively. This amount represents the use of a dose of 16 mL olive oil/ kg.
2010-08-28 | E-GEOD-17859 | biostudies-arrayexpress
Project description:The aim of this study was to identify proteomic alterations associated with functional dysregulation of the retina with diabetes that could eventually be used as surrogate endpoints in preclinical drug testing studies. A multi-modal approach of antibody (Luminex)-, electrophoresis (2-DIGE)-, and LC-MS (iTRAQ)-based quantitation methods was used to provide broad coverage of the retinal proteome. Transcriptional profiling through microarray analysis was also included to increase coverage and provide insight into potential regulation of protein expression changes at the mRNA level. The different technologies proved complementary, with limited coverage overlap between methods. Diabetes was induced in Sprague-Dawley male rats (Charles River Laboratories, Wilmington, MA) by intraperitoneal injection of 65 mg/kg streptozotocin (STZ) (Sigma-Aldrich, St. Louis, MO) in 10mM sodium citrate pH 4.5 vehicle. Control rats were injected with an equal dose of vehicle only. Rats had free access to food and water, and were maintained on a 12 hour light/dark cycle. Blood glucose level and body weight were measured 6 days post-STZ or vehicle injection, and biweekly throughout the experiment. Only rats with blood glucose levels >250 mg/dL at the time of the original test and throughout the experiment were included in the diabetic groups. At the time of retina harvest, rats were given a lethal dose of pentobarbital, 100 mg/kg, (Ovation Pharmaceuticals Inc., Deerfield, IL) by intraperitoneal injection and sacrificed by decapitation. Retinas were rapidly excised snap- frozen in liquid nitrogen for subsequent experimentation.
2010-06-01 | E-GEOD-20886 | biostudies-arrayexpress
Project description:<p>Individuals with Urea Cycle Disorders (UCD) cannot remove ammonia, a waste product, from the blood. At present there is little information on the use of sodium phenylbutyrate (Buphenyl™) in children with argininosuccinic aciduria (ASA). It is hoped that this drug may help lower ammonia and argininosuccinic acid levels in patients with ASA. Through this study we hope to learn whether the use of sodium phenylbutyrate (Buphenyl™) in patients with ASA, in addition to diet and arginine therapy, will decrease liver damage and the number of periods during which ammonia levels are high.</p> <p>The primary study objective is to determine if the treatment of ASA patients with sodium phenylbutyrate (Buphenyl™) in conjunction with lowered doses of arginine improves liver function as measured by short-term assessment of synthetic activity and the use of stable isotope tracers to assess ureagenesis and nitric oxide production.</p> <p>Twelve patients with ASA will be studied using a randomized, cross-over design. Medical records will be reviewed to confirm the diagnosis prior to enrollment. Patients will be on the each arm of the study for one week each preceded by a three day washout period. Patients will come to the Baylor College of Medicine General Clinical Research Center in Texas Children's Hospital for an inpatient hospitalization. This hospitalization is for diet control, clinical evaluation, and stable isotope infusions for measurement of in vivo rates of ureagenesis and nitric oxide production. During the washout periods Buphenyl™ or other alternative route medications, e.g., benzoate, will be discontinued and arginine will be administered at the standard therapeutic dose of 500 mg/kg/day or 10 grams/m2. </p> <p>Following randomization, subjects will be maintained on either high-dose arginine (500 mg/kg/day or 10 grams/m2) alone, or the alternative of low-dose arginine (100 mg/kg/d or 2 grams/m2) along with sodium phenylbutyrate (500 mg/kg/day or 10 grams/m2). For the second week they will be crossed over to the other arm of the study preceded by another three day washout. Previous medications and dietary protein intake (0.6 g/kg/day or current metabolic diet) will be continued during both arms of the study. The two arms may be performed as separate ten-day admissions.</p> <p>The decision to design the study with two arms, high-dose arginine and low-dose arginine/Buphenyl™, was reached after weighing several considerations. First, the current accepted practice for treatment of ASA is high-dose arginine. Based on metabolic flux studies, we have quantified the effects of this dose of arginine as compared to standard doses of Buphenyl™/phenylacetate on ureagenesis. Since the study is not designed or intended to address the independent effects of Buphenyl™ as compared to arginine alone, Buphenyl™ was added for safety reasons to accommodate loss of clearance of nitrogen by decreasing the arginine dose.</p> <p>Moreover, based on our experience with recruiting for previous versions of this study, most ASA patients with liver dysfunction are on an alternative route ammonia scavenger medication in addition to arginine. We found that this has in fact become an accepted practice.</p> <p>Hence, when considering study design from both a safety and recruitment perspective, it was most reasonable to design the study to investigate specifically the hypothesis that the production and presence of argininosuccinic acid leads to liver dysfunction. Since both low-dose arginine with Buphenyl™ and high-dose arginine alone lead to a decreased production of argininosuccinic acid, and both are currently accepted therapies in ASA and UCDs in general, the need to address their effects distinctly is not being investigated at this time.</p> <p>Sodium phenylbutyrate dosage will be 500 mg/kg/day in patients weighing less than 20kg and 10 g/m2/day in larger patients. Daily dosage will be given in equally divided doses 4 times per day. In order to ensure that the study remains double-blind to investigators, study staff and subjects, the Investigational Pharmacy Service at Texas Children's Hospital will dispense both the Buphenyl™ and arginine in powder form which is compounded into capsules or will be mixed with syrpalta (up to 5 grams will dissolve in 10cc liquid) and administered orally or through nasogastric or gastrostomy tube. No nasogastric tube should be placed or gastrostomy performed solely for the purpose of inclusion in this study. Because the reported adverse effects of sodium phenylbutyrate include gastritis, participants will be started on a standard dose of ranitidine (Zantac™), or comparable drug, during both arms of the study. </p>
| phs001305 | dbGaP
Project description:Male Sprague Dawley rats were treated orally for 5 days with reference hepatotoxicants, each at a single dose level, alpha-naphthylisothiocyanate 100mg/kg (vehicle 5ml/kg corn oil); carbon tetrachloride 1582mg/kg (vehicle 5ml/kg corn oil); methylenedianiline 100mg/kg (vehicle 35% ethanol); acetaminophen 1000mg/kg (vehicle 2ml/kg corn oil); diclofenac 10mg/kg (vehicle 10ml/kg water)
2018-11-20 | GSE122315 | GEO
Project description:Male Sprague Dawley rats were treated orally for 5 days with reference hepatotoxicants, each at a single dose level alpha-naphthylisothiocyanate 100mg/kg (vehicle 5ml/kg corn oil); carbon tetrachloride 1582mg/kg (vehicle 5ml/kg corn oil); methylenedianiline 100mg/kg (vehicle 35% ethanol); acetaminophen 1000mg/kg (vehicle 2ml/kg corn oil); diclofenac 10mg/kg (vehicle 10ml/kg water)
2018-11-06 | GSE122184 | GEO
Project description:The aim of this study was to identify alterations associated with diabetes-induced functional dysregulation of the retina and the effects of chronic insulin therapy. Transcriptional profiling through microarray analysis was analyzed to find mRNA targets of interest in diabetic samples, as well as in the insulin treated group. Verification of targets shown to be unrecovered in the insulin group was validated. Diabetes was induced in Sprague-Dawley male rats (Charles River Laboratories, Wilmington, MA) by intraperitoneal injection of 65 mg/kg streptozotocin (STZ)(Sigma-Aldrich, St. Louis, MO) in 10mM sodium citrate pH 4.5 vehicle. Control rats were injected with an equal dose of vehicle only. Rats had free access to food and water, and were maintained on a 12 hour light/dark cycle. Blood glucose level and body weight were measured 6 days post-STZ or vehicle injection, and biweekly throughout the experiment. Only rats with blood glucose levels >250 mg/dL at the time of the original test and throughout the experiment were included in the diabetic groups. The insulin treatment group received one 26mg subcutaneous pellet (LinShin Canada, Scarborough, Canada) delivered via trocar 6 weeks post-STZ injection. An additional 26 mg implant was introduced when body weight exceeded 300 g or when midday non-fasting blood glucose exceeded 250 mg/dL. At the time of retina harvest, rats were given a lethal dose of pentobarbital, 100 mg/kg, (Ovation Pharmaceuticals Inc., Deerfield, IL) by intraperitoneal injection and sacrificed by decapitation. Retinas were rapidly excised snap- frozen in liquid nitrogen for subsequent experimentation.
2011-05-23 | E-GEOD-24423 | biostudies-arrayexpress