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OFA rats are a breed of laboratory rats developed by Charles River Laboratories. They are bred and maintained for use in research applications.

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3 protocols using ofa rats

1

In Vivo Cognitive Screening of AMPA-PAMs

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All animal experimentations were performed in accordance with local ethical committees following the principles of laboratory animal care with the European Communities Council Directive 2010/63/UE. All efforts were made to minimize animal suffering and to reduce the number of animals used.
Novel object recognition and T-maze studies were conducted respectively in male OFA rats (150–175 g, Charles River, Saint-Germain-Nuelles, France) and male C57Bl/6 mice (5.5–6.5 month-old, Charles River, Saint-Germain-Nuelles, France). Animals were housed in collective cages with continuous access to tap water and food on a 12 h light-dark cycle, in a temperature-controlled (21 ± 1°C) and ventilated room. On completion of studies subjects were euthanized by either CO2 inhalation or intraperitoneal (i.p.) lethal pentobarbital injection. The novel object recognition test was used as the primary in vivo screening assay [32 ] to identify AMPA-PAMs. The T-maze task was performed using a modified continuous performance procedure previously described in mice [33 (link)].
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2

Optogenetic Modulation of Interneuron Subtypes

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All experiments were performed in accordance with the guidelines of the local Ethics Committee (CEEA-59) and EU directive (2010/63/EU). Adult male OFA rats (n = 31, 175–200 g) (Charles River, L’Arbresle, France) were used for electrophysiology. Adult mice of both sexes (n = 158, 2–12 months) were used for unitary extracellular recordings combined with opto-tagging, behavior, and immunostaining: wild type C57Bl6 (Charles River), and hybrid transgenic Pv::ChR2 and Sst::ChR2. The hybrid transgenic mice were heterozygous for both genes, obtained by mating a cre-driver transgenic line ensuring specific expression of the cre recombinase in PV or SST neurons (PV-cre: Jackson Laboratory stock #008069 or SST-cre: Jackson Laboratory stock #013044, Charles River) with a transgenic reporter line containing channelrhodopsin-2(H134R) (ChR2: Jackson Laboratory stock #012569, Charles River). Animals were housed in an approved animal facility under standard 12-hour light/dark cycles, with food and water available ad libitum, and nesting materials provided.
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3

Rat Liver Metabolic Activation for Mutagenicity Assays

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The metabolic activation mixture was a 9000 g centrifuged supernatant of a liver homogenate (S9). It was prepared from male OFA rats (Charles River Laboratories, France). Five days before sacrifice, the rats were treated with a single injection of Aroclor 1254 (500 mg/kg body weight).
The final protein concentration of the S9 mix was 26 mg/mL as determined by the method of Lowry et al. [49] . In the Salmonella mutagenicity assay, the composition of the metabolic mixture (S9 mix) included 4% S9, 10 mM glucose-6-phospahate (G6P) and 8 mM nicotinamide adenine dinucleotide phosphate (NADP) (De Méo et al. 1996 ). In the comet and micronucleus assays, the S9 mix contained 10% S9, 5 mM G6P, 4 mM NADP, 33 mM KCL and 8 mM MgCl2 diluted in 0.15 M saline phosphate buffer [50] .
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