Abstract
GLP-1 has been shown to dramatically reduce food intake in fasted rats and is thought to exert its effects by modulating neuronal function in the hypothalamus. To date, little is known about the distribution of GLP1-R and its mRNA in the rodent hypothalamus. The purpose of the present study was to utilize in situ hybridization histochemistry to determine the anatomical distribution of GLP1-R mRNA in the rat hypothalamus. The results of these studies revealed an extensive distribution of GLP1-R mRNA throughout the rostral-caudal extent of the hypothalamus; with a dense accumulation of labeled cells in the supraoptic, paraventricular, and arcuate nuclei. Additional labeled cells were also detected in medial and lateral preoptic areas, periventricular nucleus, ventral division of the bed nucleus of the stria terminalis, lateral hypothalamus, and dorsomedial nucleus. The results of these in situ hybridization histochemical studies have provided detailed and novel information about the distribution of GLP1-R mRNA in the rat hypothalamus. In addition, this morphological data provides important information about the neuronal systems modulated by GLP-1 and their potential role in feeding behavior.
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