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• W2001196812 abstract "Melanin concentrating hormone (MCH) and the orexins (A and B) have been identified as neuropeptides localized to the lateral hypothalamic area (LHA) and are potential regulators of energy homeostasis. Potential factors regulating expression of both MCH and the orexins include fasting and leptin. Previous studies have generated conflicting data and, as there is little leptin receptor expressed in the lateral hypothalamus, it is likely that any observed leptin effects on these peptides are indirect. In this study, we examined MCH and preproorexin expression in mice in physiological states of starvation, with or without leptin administration, in addition to characterizing MCH and preproorexin expression in well-known obesity models, including ob/ob and UCP-DTA mice. Neuropeptide Y (NPY) expression in the arcuate nucleus was used as a positive control. After a 60-h fast, expression of both NPY and MCH mRNA was increased (by 148 and 33%, respectively) while preproorexin expression in the murine LHA did not change. Leptin administration to fasted mice blunted the rise in MCH and NPY expression towards control levels. In contrast, there was a 78% increase in preproorexin expression in fasted mice in response to peripheral leptin administration. MCH expression was increased (by 116%) in ob/ob mice at baseline, as we have previously reported. In addition, leptin treatment of ob/ob mice blunted the increase in MCH expression. In contrast, preproorexin expression did not differ in the leptin-deficient ob/ob mice or in the obese hyperleptinemic brown adipose tissue deficient (UCP-DTA) mice in comparison with controls. In summary, MCH expression is increased in two states of decreased leptin, fasting and ob/ob mice, and leptin replacement blunts MCH expression in both paradigms. Thus, MCH expression appears to be regulated by leptin. In contrast, preproorexin expression does not respond acutely to fasting, although it is acutely increased by leptin treatment during fasting. These preproorexin responses are in contrast to those seen with well-characterized orexigenic neuropeptides, such as NPY and AgRP, suggesting that appetite regulation may not be a significant physiological role of orexins. This conclusion is further supported by the observation that orexin ablated mice have arousal and not feeding deficits." @default.
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• W2001196812 date "2001-03-01" @default.
• W2001196812 modified "2023-10-13" @default.
• W2001196812 title "Characterization of melanin concentrating hormone and preproorexin expression in the murine hypothalamus" @default.
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• W2001196812 doi "https://doi.org/10.1016/s0006-8993(01)02066-2" @default.
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