Abstract
A subset of Sprague-Dawley rats developed persistent obesity when maintained on a high-fat diet for 6 months followed by a low-fat diet for 1 month, while another subset from the same cohort of rats remained lean on the same diet regimens. The diet-induced obese (DIO) rats had higher energy intake than expenditure, while diet-resistant (DR) rats maintained energy balance. DIO rats also had an increased respiratory quotient and higher levels of plasma leptin, insulin and cholesterol. In the hypothalamic areas, DIO rats had elevated NPY and AGRP mRNA, but not MCH mRNA. Our data suggest that the increase in hypothalamic expression of NPY and AGRP may contribute to the development of persistent obesity in DIO rats.
MeSH terms
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Agouti-Related Protein
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Animals
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Cell Respiration / genetics
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Cholesterol / blood
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Dietary Fats / adverse effects*
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Disease Models, Animal
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Eating / physiology
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Energy Metabolism / physiology*
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Food, Formulated / adverse effects*
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Genetic Predisposition to Disease
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Homeostasis / genetics
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Hypothalamic Hormones / genetics
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Hypothalamus / cytology
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Hypothalamus / metabolism*
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Insulin / blood
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Intercellular Signaling Peptides and Proteins
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Leptin / blood
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Melanins / genetics
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Neuropeptide Y / genetics*
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Obesity / blood*
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Obesity / genetics
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Obesity / physiopathology
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Pituitary Hormones / genetics
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Predictive Value of Tests
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Proteins / genetics*
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RNA, Messenger / metabolism
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Rats
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Rats, Sprague-Dawley
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Up-Regulation / physiology
Substances
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Agouti-Related Protein
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Dietary Fats
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Hypothalamic Hormones
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Insulin
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Intercellular Signaling Peptides and Proteins
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Leptin
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Melanins
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Neuropeptide Y
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Pituitary Hormones
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Proteins
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RNA, Messenger
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melanin-concentrating hormone
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Cholesterol