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- W2090147204 abstract "Glucagon-like peptide 1 (GLP-1) and its analogue exendin-4 inhibit food intake, reduce blood glucose levels and increase blood pressure and heart rate by acting on GLP-1 receptors in many brain regions. Within the CNS, GLP-1 is produced only by preproglucagon (PPG) neurons. We suggest that PPG neurons mediate the central effects of GLP-1 by modulating sympathetic and vagal outflow. We therefore analysed the projections of PPG neurons to brain sites involved in autonomic control. In transgenic mice expressing yellow fluorescent protein (YFP) under the control of the PPG promoter, we assessed YFP-immunoreactive innervation using an anti-GFP antiserum and avidin-biotin-peroxidase. PPG neurons were intensely YFP-immunoreactive and axons could be easily discriminated from dendrites. YFP-immunoreactive cell bodies occurred primarily within the caudal nucleus tractus solitarius (NTS) with additional somata ventral to the hypoglossal nucleus, in raphé obscurus and in the intermediate reticular nucleus. The caudal NTS contained a dense network of dendrites, some of which extended into the area postrema. Immunoreactive axons were widespread throughout NTS, dorsal vagal nucleus and reticular nucleus with few in the hypoglossal nucleus and pyramids. The dorsomedial and paraventricular hypothalamic nuclei, ventrolateral periaqueductal grey and thalamic paraventricular nucleus exhibited heavy innervation. The area postrema, rostral ventrolateral medulla, pontine central grey, locus coeruleus/Barrington's nucleus, arcuate nucleus and the vascular organ of the lamina terminalis were moderately innervated. Only a few axons occurred in the amygdala and subfornical organ. Our results demonstrate that PPG neurons innervate primarily brain regions involved in autonomic control. Thus, central PPG neurons are ideally situated to modulate sympathetic and parasympathetic outflow through input at a variety of central sites. Our data also highlight that immunohistochemistry improves detection of neurons expressing YFP. Hence, animals in which specific populations of neurons have been genetically-modified to express fluorescent proteins are likely to prove ideal for anatomical studies." @default.
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- W2090147204 date "2011-04-01" @default.
- W2090147204 modified "2023-09-29" @default.
- W2090147204 title "Preproglucagon neurons project widely to autonomic control areas in the mouse brain" @default.
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- W2090147204 doi "https://doi.org/10.1016/j.neuroscience.2011.02.023" @default.
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