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• W1917754098 abstract "Targeted deletion of the gene encoding the neuronal and neuroendocrine secreted polypeptide VGF (nonacronymic) produces a lean, hypermetabolic mouse. Consistent with this phenotype, VGF mRNA levels are regulated in the hypothalamic arcuate nucleus in response to fasting. To gain insight into the site(s) and mechanism(s) of action of VGF, we further characterized VGF expression in the hypothalamus. Double-label studies indicated that VGF and pro-opiomelanocortin were coexpressed in lateral arcuate neurons in the fed state, and that VGF expression was induced after fasting in medial arcuate neurons that synthesize neuropeptide Y (NPY). Like NPY, VGF mRNA induction in this region of the hypothalamus in fasted mice was inhibited by exogenous leptin. In leptin-deficient <i>ob/ob</i> and receptor-mutant <i>db/db</i> mice, VGF mRNA levels in the medial arcuate were elevated. To identify neural pathways that are functionally compromised by <i>Vgf</i> ablation, VGF mutant mice were crossed with obese<i>A</i>^<i>y</i><i>/a</i> (agouti) and<i>ob/ob</i> mice. VGF deficiency completely blocked the development of obesity in<i>A^y/a</i> mice, whereas deletion of <i>Vgf</i> in <i>ob/ob</i> mice attenuated weight gain but had no impact on adiposity. Hypothalamic levels of NPY and agouti-related polypeptide mRNAs in both double-mutant lines were dramatically elevated 10- to 15-fold above those of wild-type mice. VGF-deficient mice were also found to resist diet- and gold thioglucose-induced obesity. These data and the susceptibility of VGF mutant mice to monosodium glutamate-induced obesity are consistent with a role for VGF in outflow pathways, downstream of hypothalamic and/or brainstem melanocortin 4 receptors, that project via the autonomic nervous system to peripheral metabolic tissues and regulate energy homeostasis." @default.
• W1917754098 created "2016-06-24" @default.
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• W1917754098 date "2002-08-15" @default.
• W1917754098 modified "2023-10-17" @default.
• W1917754098 title "VGF is Required for Obesity Induced by Diet, Gold Thioglucose Treatment, and Agouti and is Differentially Regulated in Pro-Opiomelanocortin- and Neuropeptide Y-Containing Arcuate Neurons in Response to Fasting" @default.
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• W1917754098 doi "https://doi.org/10.1523/jneurosci.22-16-06929.2002" @default.
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