Abstract: Noradrenergic (NA) and serotonergic (5‐HT) receptor profiles were compared in the cerebral cortex of young adult (3 months old) and aged (24 months old) male Sprague Dawley rats. β and α‐1 receptors were significantly decreased in 24 month old rats, whereas α‐2 receptors remained unchanged. 5‐HT‐2 Postsynaptic receptors and 5‐HT high affinity uptake were reduced in aged animals; on the other hand the number of 3H‐imipramine (3H‐IMI) recognition sites located on serotonin nerve terminals and labelled also by 3H‐paroxetine (3H‐PAR), were significantly higher in the cerebral cortex of old rats. The ratio 5‐hydroxyindoleacetic acid (5‐HIAA)/5‐HT, an index of serotonin turn‐over, increased in some brain areas of senescent rats. There were no age‐related changes in the responsiveness of investigated binding sites to subchronic desipramine treatment; the density of β‐noradrenergic and 5‐HT‐2 serotonergic receptors and that of 3H‐IMI binding sites was reduced both in young adult and aged rats. 1988 Nordic Pharmacological Society
Age‐Related Changes in Rat Serotonergic and Adrenergic Systems and in Receptor Responsiveness to Subchronic Desipramine Treatment / Brunello, N.; Riva, M.; Rovescalli, A. C.; Galimberti, R.; Racagni, G.. - In: PHARMACOLOGY & TOXICOLOGY. - ISSN 0901-9928. - 63:3(1988), pp. 150-155. [10.1111/j.1600-0773.1988.tb00930.x]
Age‐Related Changes in Rat Serotonergic and Adrenergic Systems and in Receptor Responsiveness to Subchronic Desipramine Treatment
Brunello N.;
1988
Abstract
Abstract: Noradrenergic (NA) and serotonergic (5‐HT) receptor profiles were compared in the cerebral cortex of young adult (3 months old) and aged (24 months old) male Sprague Dawley rats. β and α‐1 receptors were significantly decreased in 24 month old rats, whereas α‐2 receptors remained unchanged. 5‐HT‐2 Postsynaptic receptors and 5‐HT high affinity uptake were reduced in aged animals; on the other hand the number of 3H‐imipramine (3H‐IMI) recognition sites located on serotonin nerve terminals and labelled also by 3H‐paroxetine (3H‐PAR), were significantly higher in the cerebral cortex of old rats. The ratio 5‐hydroxyindoleacetic acid (5‐HIAA)/5‐HT, an index of serotonin turn‐over, increased in some brain areas of senescent rats. There were no age‐related changes in the responsiveness of investigated binding sites to subchronic desipramine treatment; the density of β‐noradrenergic and 5‐HT‐2 serotonergic receptors and that of 3H‐IMI binding sites was reduced both in young adult and aged rats. 1988 Nordic Pharmacological Society
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