| 1. |
Hideomi Hamasaki,Masahiro Shijo,Ayaka Nakamura,Hiroyuki Honda,Yuichi Yamada,Yoshinao Oda,Tomoyuki Ohara,Toshiharu Ninomiya,Toru Iwaki, Concurrent cardiac transthyretin and brain β amyloid accumulation among the older adults: The Hisayama study, Brain pathology, 10.1111/bpa.13014, 2021.10, Previous studies have revealed risk for cognitive impairment in cardiovascular diseases. We investigated the relationship between degenerative changes of the brain and heart, with reference to Alzheimer's disease (AD) pathologies, cardiac transthyretin amyloid (ATTR) deposition, and cardiac fibrosis. A total of 240 consecutive autopsy cases of a Japanese population-based study were examined. β amyloid (Aβ) of senile plaques, phosphorylated tau protein of neurofibrillary tangles, and ATTR in the hearts were immunohistochemically detected and graded according to the NIH-AA guideline for AD pathology and as Tanskanen reported, respectively. Cerebral amyloid angiopathy (CAA) was graded according to the Vonsattel scale. Cardiac fibrosis was detected by picrosirius red staining, followed by image analysis. Cardiac ATTR deposition occurred after age 75 years and increased in an age-dependent manner. ATTR deposition was more common, and of higher grades, in the dementia cases. We subdivided the cases into two age groups: ≤90 years old (n = 173) and >90 years old (n = 67), which was the mean and median age at death of the AD cases. When adjusted for age and sex, TTR deposition grades correlated with Aβ phase score (A2–3), the Consortium to Establish a Registry for AD score (sparse to frequent), and high Braak stage (V–VI) only in those aged ≤90 years at death. No significant correlation was observed between the cardiac ATTR deposition and CAA stages, or between cardiac fibrosis and AD pathologies. Collectively, AD brain pathology correlated with cardiac TTR deposition among the older adults ≤90 years.. |
| 2. |
Hideomi Hamasaki, Hiroyuki Honda, Satoshi O. Suzuki, Masahiro Shijo, Tomoyuki Ohara, Yozo Hatabe, Tsuyoshi Okamoto, Toshiharu Ninomiya, Toru Iwaki, Tauopathy in basal ganglia involvement is exacerbated in a subset of patients with Alzheimer's disease
The Hisayama study, Alzheimer's and Dementia: Diagnosis, Assessment and Disease Monitoring, 10.1016/j.dadm.2019.04.008, 11, 415-423, 2019.12, Introduction: We have conducted the pathological cohort study of autopsied cases of Hisayama residents to reveal a recent trend of dementia-related pathology. We noticed a trend of putaminal involvement of Alzheimer's disease (AD) with parkinsonism. Then, we investigated the accurate prevalence of neurological diseases with putaminal AD pathology in the general population. Methods: We examined a series of 291 autopsies in the Hisayama study and performed image analysis of immunohistochemistry for microtubule-associated protein tau (MAPT) and amyloid β. Results: Approximately 65.6% and 36.1% of cases showed putaminal MAPT and amyloid deposits, respectively. Diffuse deposits of them were mainly found in the AD cases. Putaminal MAPT was highly associated with AD-related pathological criteria. Four of 22 cases with severe putaminal MAPT deposition were documented as having developed parkinsonism. Discussion: Severe MAPT accumulation in the basal ganglia was closely related to the development of AD pathology and could occur most frequently in AD cases without comorbidities.. |
