title: Age-related changes in brain neurotransmission.
abstract: In experiments on 2-, 10- and 22-month-old rats it was found that the Bmax values of dopamine (DA2), serotonin (5-HT1) and enkephalin (Enk) receptors as well as the 5-HT level in the three brain regions (cortex, striatum and hypothalamus) decreased with age; the DA level in the brain cortex and striatum and the noradrenaline (NA) content in the brain cortex decreased, while the NA level in the striatum and the 5-hydroxyindolacetic acid (5-HIAA) level in the brain cortex and the striatum as well as the MAO-T and MAO-A activities in the three brain structures increased. It is suggested that these and other changes observed in brain neurotransmission are an important element in the neurochemical bases of the age-related changes in behavior.
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D001679:Biogenic Amines / Q000378:metabolism; D001921:Brain / Q000378:metabolism*; D003342:Corpus Striatum / Q000378:metabolism; D005625:Frontal Lobe / Q000378:metabolism; D007031:Hypothalamus / Q000378:metabolism; D008995:Monoamine Oxidase / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000378:metabolism; D011957:Receptors, Opioid / Q000378:metabolism; D011985:Receptors, Serotonin / Q000378:metabolism
chemical_list: D001679:Biogenic Amines; D018377:Neurotransmitter Agents; D011954:Receptors, Dopamine; D011957:Receptors, Opioid; D011985:Receptors, Serotonin; C033593:methionine-enkephalin receptor; C031611:spiroperidol receptor; D008995:Monoamine Oxidase