A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Age-related loss of extrastriatal dopamine D-2-like receptors in women
Tekijät: Kaasinen V, Kemppainen N, Nagren K, Helenius H, Kurki T, Rinne JO
Kustantaja: BLACKWELL PUBLISHING LTD
Julkaisuvuosi: 2002
Journal: Journal of Neurochemistry
Tietokannassa oleva lehden nimi: JOURNAL OF NEUROCHEMISTRY
Lehden akronyymi: J NEUROCHEM
Vuosikerta: 81
Numero: 5
Aloitussivu: 1005
Lopetussivu: 1010
Sivujen määrä: 6
ISSN: 0022-3042
DOI: https://doi.org/10.1046/j.1471-4159.2002.00895.x
Tiivistelmä
Positron emission tomography (PET) studies have indicated that the in vivo availability of dopamine D-2 -like receptors declines with age in the human brain. Most of the studies have been carried out with healthy male subjects, or with subject groups containing both sexes. The authors have recently demonstrated that the availability of D-2 -like receptors in the frontal cortex is higher in women than in men. The present study was aimed to further examine this phenomenon. Thirty-seven healthy women (age range 22-78 years) were examined with PET and [C-11]FLB 457, a high-affinity tracer for the extrastriatal D-2-like receptors. A negative relationship between age and dopamine D-2-like receptor availability was seen in the frontal cortex (decrease of 12% per decade of life), the temporal cortex (9%) and the thalamus (6%). A non-linear s-shape association explained the relationship only in the frontal cortex, while in other regions the association was linear. Neither oestradiol nor progesterone levels had a significant relationship with the [C-11]FLB 457 uptake in any of the brain regions studied after the effect of age was partialled out. The results indicate that: (i) the extrastriatal D-2-like receptor availability decreases with age in healthy women with the fastest rate in the frontal cortex and with the overall rate close to the rate reported in healthy men; (ii) around midlife (age 40-60 years) in women, the frontal receptor decline plateaus while the decline continues to be linear in other extrastriatal brain regions; and (iii) serum oestradiol or progesterone levels are not associated with cortical or thalamic D-2 -like receptor availability in women. The results may prove to be important in studies where the biochemical basis of clinical sex differences is examined in patients with dopamine-related neuropsychiatric disorders.
Positron emission tomography (PET) studies have indicated that the in vivo availability of dopamine D-2 -like receptors declines with age in the human brain. Most of the studies have been carried out with healthy male subjects, or with subject groups containing both sexes. The authors have recently demonstrated that the availability of D-2 -like receptors in the frontal cortex is higher in women than in men. The present study was aimed to further examine this phenomenon. Thirty-seven healthy women (age range 22-78 years) were examined with PET and [C-11]FLB 457, a high-affinity tracer for the extrastriatal D-2-like receptors. A negative relationship between age and dopamine D-2-like receptor availability was seen in the frontal cortex (decrease of 12% per decade of life), the temporal cortex (9%) and the thalamus (6%). A non-linear s-shape association explained the relationship only in the frontal cortex, while in other regions the association was linear. Neither oestradiol nor progesterone levels had a significant relationship with the [C-11]FLB 457 uptake in any of the brain regions studied after the effect of age was partialled out. The results indicate that: (i) the extrastriatal D-2-like receptor availability decreases with age in healthy women with the fastest rate in the frontal cortex and with the overall rate close to the rate reported in healthy men; (ii) around midlife (age 40-60 years) in women, the frontal receptor decline plateaus while the decline continues to be linear in other extrastriatal brain regions; and (iii) serum oestradiol or progesterone levels are not associated with cortical or thalamic D-2 -like receptor availability in women. The results may prove to be important in studies where the biochemical basis of clinical sex differences is examined in patients with dopamine-related neuropsychiatric disorders.
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