%0 Journal Article
%T Astrogliosis in aging and Parkinson's disease dementia: a new clinical study with 11C-BU99008 PET.
%A Mohamed MA
%A Zeng Z
%A Gennaro M
%A Lao-Kaim NP
%A Myers JFM
%A Calsolaro V
%A Femminella GD
%A Tyacke RJ
%A Martin-Bastida A
%A Gunn RN
%A Nutt DJ
%A Edison P
%A Piccini P
%A Roussakis AA
%A Mohamed MA
%A Zeng Z
%A Gennaro M
%A Lao-Kaim NP
%A Myers JFM
%A Calsolaro V
%A Femminella GD
%A Tyacke RJ
%A Martin-Bastida A
%A Gunn RN
%A Nutt DJ
%A Edison P
%A Piccini P
%A Roussakis AA
%J Brain Commun
%V 4
%N 5
%D 2022
%M 36072646
暂无%R 10.1093/braincomms/fcac199
%X The role of astrogliosis in the pathology of brain aging and neurodegenerative diseases has recently drawn great attention. Imidazoline-2 binding sites represent a possible target to map the distribution of reactive astrocytes. In this study, we use 11C-BU99008, an imidazoline-2 binding sites-specific PET radioligand, to image reactive astrocytes in vivo in healthy controls and patients with established Parkinson's disease dementia. Eighteen healthy controls (age: 45-78 years) and six patients with Parkinson's disease dementia (age: 64-77 years) had one 11C-BU99008 PET-CT scan with arterial input function. All subjects underwent one 3 T MRI brain scan to facilitate the analysis of the PET data and to capture individual cerebral atrophy. Regional 11C-BU99008 volumes of distribution were calculated for each subject by the two-tissue compartmental modelling. Positive correlations between 11C-BU99008 volumes of distribution values and age were found for all tested regions across the brain within healthy controls (P < 0.05); furthermore, multiple regression indicated that aging affects 11C-BU99008 volumes of distribution values in a region-specific manner. Independent samples t-test indicated that there was no significant group difference in 11C-BU99008 volumes of distribution values between Parkinson's disease dementia (n = 6; mean age = 71.97 ± 4.66 years) and older healthy controls (n = 9; mean age = 71.90 ± 5.51 years). Our data set shows that astrogliosis is common with aging in a region-specific manner. However, in this set-up, 11C-BU99008 PET cannot differentiate patients with Parkinson's disease dementia from healthy controls of similar age.