Sucrose intake by rats affected by both intraperitoneal oxytocin administration and time of day

Psychopharmacology - Tập 239 - Trang 429-442 - 2021
Simone Rehn1, Joel S. Raymond1,2, Robert A. Boakes1, Michael T. Bowen1,2
1Faculty of Science, School of Psychology, The University of Sydney, Sydney, Australia
2Brain and Mind Centre, The University of Sydney, Camperdown, Sydney, Australia

Tóm tắt

Daily limited access to palatable food or drink at a fixed time is commonly used in rodent models of bingeing. Under these conditions, entrainment may modulate intake patterns. Oxytocin is involved in circadian patterns of intake and, when administered peripherally, reduces sucrose intake. However, oxytocin’s effects on intake under limited-access conditions and its potential interaction with entrainment have not been explored. This study examined the role of entrainment on intake patterns, oxytocin’s effects on sucrose intakes and locomotor activity and whether oxytocin’s effects were mediated by its actions at the oxytocin receptor. Sated rats received daily 1-h access to 10% sucrose solution either at a fixed or varied time of day. Rats received intraperitoneal oxytocin (0 mg/kg, 0.3 mg/kg, 1 mg/kg, 3 mg/kg) prior to sucrose access, and spontaneous locomotor activity was assessed in an open-field test. Rats were then pre-treated with an oxytocin receptor antagonist, L368,899, prior to oxytocin before sucrose access. Intake patterns did not differ between fixed- or varied-time presentations; rats consumed more sucrose solution in the middle as opposed to the early-dark phase. Oxytocin dose-dependently reduced sucrose intakes, but also reduced locomotor activity. There was some evidence of partial blockade of oxytocin-induced sucrose intake reductions by L368,899, but the results were unclear. Time of day and oxytocin impact sucrose solution intake under daily limited access in rats and the sedative-like effects of oxytocin should be considered in future studies on oxytocin and food intake.

Tài liệu tham khảo

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