@article {9088, title = {Pattern of Altered Magnetization Transfer Rate in Alzheimer{\textquoteright}s Disease.}, journal = {J Alzheimers Dis}, year = {2022}, month = {2022 Jun 09}, abstract = {

BACKGROUND: Biomarkers for Alzheimer{\textquoteright}s disease (AD) are crucial for early diagnosis and treatment monitoring once disease modifying therapies become available.

OBJECTIVE: This study aims to quantify the forward magnetization transfer rate (kfor) map from brain tissue water to macromolecular protons and use it to identify the brain regions with abnormal kfor in AD and AD progression.

METHODS: From the Cardiovascular Health Study (CHS) cognition study, magnetization transfer imaging (MTI) was acquired at baseline from 63 participants, including 20 normal controls (NC), 18 with mild cognitive impairment (MCI), and 25 AD subjects. Of those, 53 participants completed a follow-up MRI scan and were divided into four groups: 15 stable NC, 12 NC-to-MCI, 12 stable MCI, and 14 MCI/AD-to-AD subjects. kfor maps were compared across NC, MCI, and AD groups at baseline for the cross-sectional study and across four longitudinal groups for the longitudinal study.

RESULTS: We found a lower kfor in the frontal gray matter (GM), parietal GM, frontal corona radiata (CR) white matter (WM) tracts, frontal and parietal superior longitudinal fasciculus (SLF) WM tracts in AD relative to both NC and MCI. Further, we observed progressive decreases of kfor in the frontal GM, parietal GM, frontal and parietal CR WM tracts, and parietal SLF WM tracts in stable MCI. In the parietal GM, parietal CR WM tracts, and parietal SLF WM tracts, we found trend differences between MCI/AD-to-AD and stable NC.

CONCLUSION: Forward magnetization transfer rate is a promising biomarker for AD diagnosis and progression.

}, issn = {1875-8908}, doi = {10.3233/JAD-220335}, author = {Duan, Wenna and Sehrawat, Parshant and Zhou, Tony D and Becker, James T and Lopez, Oscar L and Gach, H Michael and Dai, Weiying} } @article {9389, title = {Prospective Longitudinal Perfusion in Probable Alzheimer{\textquoteright}s Disease Correlated with Atrophy in Temporal Lobe.}, journal = {Aging Dis}, year = {2023}, month = {2023 May 09}, abstract = {

Reduced cerebral blood flow (CBF) in the temporoparietal region and gray matter volumes (GMVs) in the temporal lobe were previously reported in patients with mild cognitive impairment (MCI) and Alzheimer{\textquoteright}s disease (AD). However, the temporal relationship between reductions in CBF and GMVs requires further investigation. This study sought to determine if reduced CBF is associated with reduced GMVs, or vice versa. Data came from 148 volunteers of the Cardiovascular Health Study Cognition Study (CHS-CS), including 58 normal controls (NC), 50 MCI, and 40 AD who had perfusion and structural MRIs during 2002-2003 (Time 2). Sixty-three of the 148 volunteers had follow-up perfusion and structural MRIs (Time 3). Forty out of the 63 volunteers received prior structural MRIs during 1997-1999 (Time 1). The relationships between GMVs and subsequent CBF changes, and between CBF and subsequent GMV changes were investigated. At Time 2, we observed smaller GMVs (p<0.05) in the temporal pole region in AD compared to NC and MCI. We also found associations between: (1) temporal pole GMVs at Time 2 and subsequent declines in CBF in this region (p=0.0014) and in the temporoparietal region (p=0.0032); (2) hippocampal GMVs at Time 2 and subsequent declines in CBF in the temporoparietal region (p=0.012); and (3) temporal pole CBF at Time 2 and subsequent changes in GMV in this region (p = 0.011). Therefore, hypoperfusion in the temporal pole may be an early event driving its atrophy. Perfusion declines in the temporoparietal and temporal pole follow atrophy in this temporal pole region.

}, issn = {2152-5250}, doi = {10.14336/AD.2023.0430}, author = {Zhou, Tony D and Zhang, Zongpai and Balachandrasekaran, Arvind and Raji, Cyrus A and Becker, James T and Kuller, Lewis H and Ge, Yulin and Lopez, Oscar L and Dai, Weiying and Gach, H Michael} }