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- W2154628078 abstract "The brain contains a subpopulation of glucosensing neurons that alter their firing rate in response to elevated glucose concentrations. In pancreatic beta-cells, glucokinase (GK), the rate-limiting enzyme in glycolysis, mediates glucose-induced insulin release by regulating intracellular ATP production. A similar role for GK is proposed to underlie neuronal glucosensing. Via in situ hybridization, GK mRNA was localized to hypothalamic areas that are thought to contain relatively large populations of glucosensing neurons (the arcuate, ventromedial, dorsomedial, and paraventricular nuclei and the lateral area). GK also was found in brain areas without known glucosensing neurons (the lateral habenula, the bed nucleus stria terminalis, the inferior olive, the retrochiasmatic and medial preoptic areas, and the thalamic posterior paraventricular, interpeduncular, oculomotor, and anterior olfactory nuclei). Conversely, GK message was not found in the nucleus tractus solitarius, which contains glucosensing neurons, or in ependymal cells lining the third ventricle, where others have described its presence. In the arcuate nucleus, >75% of neuropeptide Y-positive neurons also expressed GK, and most GK+ neurons also expressed KIR6.2 (the pore-forming subunit of the ATP-sensitive K+ channel). The anatomic distribution of GK mRNA was confirmed in micropunch samples of hypothalamus via reverse transcription-polymerase chain reaction (RT-PCR). Nucleotide sequencing of the recovered PCR product indicated identity with nucleotides 1092-1411 (within exon 9 and 10) of hepatic and beta-cell GK. The specific anatomic localization of GK mRNA in hypothalamic areas known to contain glucosensing neurons and the coexpression of KIR6.2 and NPY in GK+ neurons support a role for GK as a primary determinant of glucosensing in neuropeptide neurons that integrate multiple signals relating to peripheral energy metabolism." @default.
- W2154628078 created "2016-06-24" @default.
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- W2154628078 date "2000-05-01" @default.
- W2154628078 modified "2023-10-18" @default.
- W2154628078 title "Localization of glucokinase gene expression in the rat brain." @default.
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- W2154628078 doi "https://doi.org/10.2337/diabetes.49.5.693" @default.
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