کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5924851 | 1571203 | 2013 | 6 صفحه PDF | دانلود رایگان |

Evidence in the literature raises the possibility that alterations in neuropeptide Y (NPY) in the dorsomedial hypothalamus (DMH) may contribute to hyperphagia leading to body weight gain. Previously, we have shown that compared to AAVGFP controls, adeno-associated virus (AAV)-mediated overexpression of NPY in the DMH of lean rats resulted in significantly higher body weight gain that was attributed to increased food intake, and this was further exacerbated by a high-fat diet. Here, we tested AAVNPY and AAVGFP control rats in a brief-access taste procedure (10-s trials, 30-min sessions) to an array of sucrose concentrations under ad libitum and partial food and water access conditions. The test allows for some segregation of the behavioral components by providing a measure of trial initiation (appetitive) and unconditioned licks at each concentration (consummatory). Consistent with previous findings suggesting that NPY has a primary effect on appetitive function, overexpression of DMH NPY did not significantly alter concentration-dependent licking response to sucrose but when tested in a non-restricted food and water schedule, AAVNPY rats initiated significantly more sucrose trials compared to AAVGFP controls in a brief-access taste test.
⺠Rats with adeno-associated virus mediated overexpression of NPY (AAVNPY) in the DMH. ⺠Sucrose-concentration series in a brief-access taste test. ⺠AAVNPY rats initiated more trials than AAVGFP controls. ⺠Consistent with hypothesis that main feeding effects are on appetitive function. ⺠No significant group differences in lick response across the sucrose concentrations.
Journal: Physiology & Behavior - Volumes 110â111, 17 February 2013, Pages 109-114