An automated home cage observation system as a model of feeding
behaviour in mice
Lianne Robinson, Susan McKillop-Smith, and Gernot Riedel School of Medical Science, College of Life Science and Medicine, University of Aberdeen, Aberdeen, Scotland, UK,
both the light and dark phases of the experimental days. In addition to these parameters the body weight of each animal, Obesity is characterised by an increase in consumption of food weight of food hopper (food intake) and weight of water bottle containing high levels of sugar and saturated fats combined (water intake) were recorded on a daily basis immediately with a reduction in physical activity. The increased prevalence prior to drug injection and also post drug treatment (between of obesity and childhood obesity in western countries has the hours of 10.00 – 11.00 am of the light cycle). highlighted the need for anorectic agents which are effective in weight management. The Cannabinoid (CB1) antagonist SR141716A Acute treatment with AM251 induced a suppression of food (Rimonabant/Acomplia) has previously been shown to intake and a reduction in body weight compared to vehicle suppress food intake [1, 2]. However, in addition to drug treated animals. AM251 treated animals also spent less in the induced effects on food intake and body weight, drug areas of the arena associated with food and water. In addition treatment can also affect activity levels [3, 4]. An increase in a reduction in locomotor activity was also observed although activity may lead to hyperactivity which could explain a this was only apparent for the first few hours of the dark reduction in body weight which is independent of any phase. Repeated dosing with AM251 also produced a reduction in food consumption. Therefore, a more detailed significant suppression in body weight and food intake relative assessment of drug-related effects on activity in conjunction to controls, with animals spending less time in the food zone with drug-induced hypophagic properties is required. on all nights following treatment. Similar to acute treatment a decrease in overall locomotor activity was also evident. The aim of this study was to develop a novel method which Conclusions
would combine these two approaches and allow us to assess These findings suggest that the home cage observation system both the feeding behaviour and locomotor activity of free- ‘phenotyper’ is a sensitive and effective method to assess the feeding mice. The cannabinoid antagonist AM251 was used to hypophagic effects of possible anti-obesity drugs as it allows the long-term continuous monitoring of both food intake and behavioural activity. Male and female C57BL6 mice (25-32g) were used in this study. The automated home cage video-based observation system ‘phenotyper’ was used to allow long-term continuous References
monitoring of behavioural activity of the mice. During testing Colombo, G, Agabio, R, Diaz, G, Lobina, C, Reali, R, Gessa, the mice were maintained on a 12 hr light/dark cycle (lights GL (1998). Appetite suppression and weight loss after the off 7pm) with free access to food (food hopper) and water cannabinoid antagonist SR 141716. Life Science 63: PL113-117
Vickers, SP, Webster, LJ, Wyatt, A, Dourish, CT, Kennett, GA (water bottle). Animals were given 3-4 days of habituation in (2003). Preferential effects of the cannabinoid CB1 receptor the phenotyper prior to drug administration in order to attain a antagonist, SR141716, on food intake and body weight gain of baseline level of performance and were matched for body obese (fa/fa) compared to lean Zucker rats. weight before being assigned to drug groups of AM251 (10 Psychopharmacology 167: 103-111
mg/kg) or Tween 80, with all drugs injected intraperitoneally Compton, DR, Aceto, MD, Lowe, J, Martin, BR (1996). In vivo 1-2 hours prior to the start of the dark phase of the circadian characterization of a specific cannabinoid receptor antagonist cycle. A single acute treatment or repeated dosing regime was (SR141716A): Inhibition of Delta (9)- tetrahydrocannabinol- employed with the drug administered daily for 4 consecutive induced responses and apparent agonist activity. Journal of days. The behaviour of the animals was monitored using the Pharmacology and Experimental Therapeutics 277 (2): 586-594
computer based tracking software Ethovision (version 3.0, Bass, CE, Griffin, G, Grier, M, Mahadevan, A, Razdan, RK, Martin, BR (2002). SR141716A induced stimulation of Noldus, Netherlands). The parameters recorded included total locomotor activity: a structure-activity relationship study. locomotor activity, time spent in the area in front of the food Pharmacology Biochemistry and Behavior 74: 31-40
hopper and time spent in the area close to the water bottle. These parameters were analysed in hourly intervals during roceedings of Measuring Behavior 2008 (Maastricht, The Netherlands, August 26-29, 2008) Eds. A.J. Spink, M.R. Ballintijn, N.D. Bogers, F. Grieco, L.W.S. Loijens, L.P.J.J. Noldus, G. Smit, and P.H. Zimmerman

Source: http://www.neurobsik.nl/Robinson_et_al_2008.pdf

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