Abstract
Quantitative in situ hybridization was used to examine the expression of mRNA for nerve growth factor (NGF) and its receptors, p140Trk (TrkA) and p75LNGFR (LNGFR), in different brain regions of adult (3-month-old) and aged (27-month-old) Wistar rats. The brain regions studied were hippocampus (dentate gyrus, CA3 region), basal forebrain (medial septum, diagonal band) and caudate-putamen. Prior to hybridization histochemistry behaviorally impaired as well as severely impaired animals were selected from a large group of old rats according to their performance in the Morris water maze. The impaired rats showed longer escape latencies and, thus, implicitly impaired performance in the place version of the task, but did not differ from adult controls on the platform crossing measure registered during the spatial probe trial. The severely impaired rats were significantly impaired on both measures, both in comparison with the adult animals and in comparison with the impaired aged rats. Inspection of the hippocampus revealed no age- or performance-related changes in NGF mRNA levels. The overall expression of TrkA mRNA in basal forebrain and caudate was found to be decreased in the impaired (-20%) as well as the severely impaired aged ra...Continue Reading
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