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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Metabolic mapping of functional activity in the olfactory system of normal and hypogonadal (hpg) mice.

The hypogonadal mouse, which lacks gonadotropin-releasing hormone, has been suggested as an animal model of Kallmann's syndrome, one symptom of which is hyposmia. We have determined the metabolic activity of the olfactory system, in normal and hypogonadal mice, using [14C]-2-deoxyglucose quantitative autoradiography. In the olfactory lobes, deoxyglucose uptake was greatest in the glomerular and granule cell layers and low in the olfactory nerve layer and bulb core. The pattern of uptake was similar in both hypogonadal and normal mice breathing filtered air. Exposure of normal mice to ethyl acetoacetate significantly increased deoxyglucose uptake in the olfactory nerve layer and glomerular layer, but not in the granule cell layer. Several foci of intense metabolic activity were produced, apparently corresponding to small groups of activated glomeruli. There were no changes in the secondary or tertiary projections of the olfactory system. In hypogonadal mice, ethyl acetoacetate failed to increase the number of foci and the density of labelling in the olfactory nerve layer and glomerular layer. These data show that the functional activity of the olfactory system in hypogonadal mice breathing air is apparently normal. However, the olfactory response to ethyl acetoacetate is significantly less in hypogonadal mice. Whether this is due to their lack of gonadotropin-releasing hormone requires further experimentation.[1]


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