Publications by authors named "J C Troncoso"
Article Synopsis
- Asymptomatic Alzheimer's disease (AsymAD) is characterized by the presence of Alzheimer's pathology in individuals who maintain cognitive function, showing lower neuroinflammation compared to symptomatic Alzheimer's disease cases.
- Research using postmortem brain samples revealed that AsymAD subjects have unique characteristics such as enriched core plaques and reduced tau aggregation, along with increased microglial activity around amyloid plaques.
- The study suggests that the composition of the plaque microenvironment, particularly enhanced actin-based motility pathways in microglia, may play a key role in the resilience to Alzheimer's pathology and cognitive decline in AsymAD individuals.
Background: Cerebral amyloid angiopathy (CAA), defined as the accumulation of amyloid in cerebral blood vessels causing alterations in the blood brain barrier (BBB) and the gliovascular unit, occurs in over 85% of Alzheimer's disease (AD) cases, positioning CAA as one of the strongest vascular contributors to age-related cognitive decline. However, the specific mechanisms in the microvasculature that become altered due to amyloid deposition and its downstream effects on the brain are complex and incompletely understood. A spatial transcriptomic analysis comparing pathways affected in the gliovascular niche differently in the presence of vascular amyloid could provide critical insight into the mechanisms underlying cerebrovascular changes involved in the deposition of Amyloid in the cerebrovasculature.
View Article and Find Full Text PDFBackground: Tau aggregates, a hallmark of Alzheimer's disease (AD) and other tauopathies, spread throughout the brain, contributing to neurodegeneration. How this propagation occurs remains elusive. Previous research suggests that tau-seed interactors play a crucial role.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Background: Although the rate of Alzheimer's disease (AD) in African-ancestry (AA) Americans is higher than that of persons from European-ancestry (EA) populations, AA participants have been underrepresented in AD neuropathological studies.
Method: Utilizing the AD Research Centers (ADRC) infrastructure, we obtained AA donor pre-frontal cortex (PFC) tissue from brain repositories of 12 ADRC and generated bulk RNA sequencing (RNA-seq) data for 179 samples that met QC and inclusion criteria. Previously generated PFC RNAseq data were obtained for 28 additional AA donors from the Columbia University ADRC.
Article Synopsis
- Symbiotic marine bacteria, particularly Vibrio species, face environmental factors like salinity and temperature, which impact their ability to colonize specific hosts, such as the squid Sepiola atlantica.
- A study conducted in the Galician Rías of Spain examined the genetic relationships between the squid and its Vibrio symbionts, revealing that the squid populations are genetically similar (panmictic), while the bacteria show more genetic variation influenced by environmental hydrology.
- The findings suggest that environmental factors play a more significant role in shaping the population structure of Vibrio symbionts than host specificity in environmentally transmitted symbiotic relationships.