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Normal chow

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Normal chow is a type of laboratory animal diet. It is formulated to provide a balanced and complete nutrition for laboratory animals, such as rodents, during the course of experiments or general maintenance.

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6 protocols using normal chow

1

Blood Pressure Measurement in Sprague Dawley Rats

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Male Sprague Dawley rats weighing 200–225 g were housed in a standard caging. Rats were fed normal chow containing 0.4% sodium (Harlan Teklad, Madison, WI, USA) and allowed free access to distilled water. Prior to the beginning of the experiment, rats were pretrained on a noninvasive tail cuff plethysmography multichannel system (Kent Scientific, Torrington, CT, USA) three times a week for 2 weeks to measure systolic blood pressure. All procedures were approved by the Henry Ford Health System Institutional Animal Care and Use Committee and adhered to the guiding principles in the care and use of experimental animals in accordance with the National Institute of Health guidelines. Henry Ford Hospital operates an Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC)-accredited animal care facility.
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2

CSNK1a1 Knockout Metabolic Phenotyping

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The PPARγ-tTA and TRE-Cre mice were maintained as described and used to generate controls and CSNK1a1 loss-of-function mutants. CSNK1a1 conditional knockout mice (loxP sites flank exon 3) were provided by Benjamin Ebert, Harvard University. Mice were fed normal chow (4% fat, Teklad). Sample size was chosen as needed for statistical significance by a two-tailed Student's t-test. Control and mutant male mice were analysed for glucose levels at 5 weeks, 10 weeks and 3.5 months of age. Fed blood glucose was measured at the end of the light cycle, between 17:00 and 18:00 hours, using a standard glucometer (Contour). For GTTs, 1.25 mg glucose per 1 g mouse weight was injected intraperitoneally after a 5–6-h daytime fast; blood glucose levels were measured at the indicated times. Fat content was measured using a minispec mq10 NMR Analyzer (Bruker) at the UT Southwestern Medical Center Mouse Metabolic Phenotyping Core (MMPC). Necropsies were performed on male mice ⩾3.5 months of age. Plasma triglyceride and hormone tests were also done at the UTSW MMPC. Veterinary care was provided by the Division of Comparative Medicine. Animals were maintained under the UT Southwestern Medical Center Animal Care and Use Committee guidelines according to current NIH guidelines under animal protocol 2010-0015.
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3

Alcohol Consumption in Rodent Models

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Adult post pubertal age‐matched male NMRI mice (8 to 12 weeks old and 25 to 40 g body weight; B&K Universal AB, Sollentuna, Sweden) were used. We have extensive experience with NMRI mice, and they are considered to be a good model for general use and are extensively used in behavioral studies used in psychopharmacology research (Jerlhag et al., 2009). All mice were group‐housed and maintained at a 12/12 hour light/dark cycle. Adult post pubertal age‐matched male Rcc Han Wistar rats (Harlan, Horst, Netherlands) were used as they are known to voluntarily consume alcohol using the intermittent access model and thereby reach physiological relevant blood alcohol concentrations (Simms et al., 2008). They were housed individually in high Macrolon III cages covered with filter tops (Tecniplast, Varese, Italy) and maintained on a 12‐hour reversed light dark cycle.
All animals were maintained at 20°C with 50% humidity and tap water and food (Normal chow; Harlan Teklad, Norfolk, UK) were supplied ad libitum. These studies were carried out in strict accordance with the recommendations in the Swedish Animal Welfare Act, and all experiments were approved by the Swedish Ethical Committee on Animal Research in Gothenburg.
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4

Transgenic Mouse Models for Adipose Research

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The PPARγ-tTA, TRE-Cre, Sox2-Cre, floxed ERα, TRE-H2B-GFP, R26R-RFP and R26R-lacZ mice were maintained as described and used to generate controls, mutants and lineage reporter mouse lines29 (link)–31 (link). AdipoTrak mice are defined as PPARγ-tTA; TRE-Cre; TRE-H2B-GFP. AT-ERαKO mutants are homozygous for ERαf/f allele, while controls are homozygous for ERα+/+ or lack TRE-Cre regardless of ERα alleles. The mice were housed in a temperature-controlled environment using a 12:12 light/dark cycle, and chow and water were provided ad libitum. The mice were fed either normal chow (4% fat, Harlan-Teklad, Madison, WI) or HFD (60%, Harlan Teklad). Fat content was measured using a minispec mq10 NMR Analyzer (Bruker). For glucose and insulin tolerance tests, 1.25 mg glucose or 1.5 mU Humalog (Lilly)/g mouse weight was injected intraperitoneally (IP) after a 5-h fast; blood glucose levels were measured at the indicated intervals31 (link),57 (link). BrdU was IP injected (100 mg kg−1 body mass) or provided in the drinking water (0.5 mg ml−1 in 1% sucrose). Sera insulin was measured by using an ELISA kit in the metabolic core. Veterinary care was provided by Division of Comparative Medicine. Animals were maintained under UT Southwestern Medical Center Animal Care and Use Committee guidelines according to current NIH guidelines under animal protocol 2010–0015.
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5

Dietary-Induced Obesity Rat Model

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Forty-three Sprague-Dawley adult rats (Charles River, Wilmington, MA) were utilized during these studies. Rats at approximately 4 weeks of age, weighing between 200–225 g were housed in temperature and humidity controlled cages and maintained on a 12:12-hr light-dark cycle (lights on at 0700).
Rats were either maintained on normal diet or placed on a nutritionally complete high fat diet to induce obesity. The high fat diet (D12494, Research Diets Inc., New Brunswick, NJ) consists of 60% kcal fat, 20% kcal carbohydrates, and 20% kcal protein, providing a 5.24 kcal/gram diet. The rats were maintained on the high fat diet for 26–28 weeks prior to surgery and continued on the high fat diet throughout the experiment. Seven rats were maintained on normal chow (Harlan Teklad, Madison, WI), while thirty-six rats were placed on high fat chow. The high fat diet group was further separated into three surgical groups as follows: SHAM, n=14, SHAM WM (weight managed), n=8, and RYGB, n=14. Normal diet controls, RYGB, and SHAM rats were allowed ad lib access to food prior to and after surgery with water ad lib, except during training and drug schedule. SHAM WM rats were allowed ad lib access to food prior to surgery; however, after surgery these rats were given 5 HFD pellets daily as a weight managed group.
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6

Acclimatization and Housing Conditions for NMRI Mice

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Adult post-pubertal age-matched male NMRI mice (8–12 weeks old and 25–40 g body weight; Charles River, Susfeldt, Germany) were used. The mice were allowed to acclimatize at least one week before the start of the experiment and were group housed and maintained at a 12/12 hour light/dark cycle, a temperature at 20°C and a 50% humidity. Tap water and food (normal chow; Harlan Teklad, Norfolk, England) were supplied ad libitum. The Swedish Ethical Committee on Animal Research in Gothenburg approved the experiments and all efforts were made to minimize animal suffering as well as to reduce the number of animals used. Each experiment used an independent set of mice
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