Impaired spatial coding and neuronal hyperactivity in the medial entorhinal cortex of aged mice.

The progressive accumulation of amyloid beta (Aβ) pathology in the brain has been associated with aberrant neuronal network activity and poor cognitive performance in preclinical mouse models of Alzheimer's disease (AD). Presently, our understanding of the mechanisms driving pathology-associated neuronal dysfunction and impaired information processing in the brain remains incomplete. Here, we assessed the impact of advanced Aβ pathology on spatial information processing in the medial entorhinal cortex (MEC) of 18-month knock-in (APP KI) mice as they explored contextually novel and familiar open field arenas in a two-day, four-session recording paradigm.

Ever-evolving insights into the cellular and molecular drivers of lymphoid cell development.

Lymphocytes play a critical role in adaptive immunity and defense mechanisms, but the molecular mechanisms by which hematopoietic stem and progenitor cells differentiate into T and B lymphocytes are not fully established. Pioneer studies identify several transcription factors essential for lymphoid lineage determination. Yet, many questions remain unanswered about how these transcription factors interact with each other and with chromatin at different developmental stages.

Inclusion of Veterans Health Administration hospitals in Centers for Medicare & Medicaid Services Overall Hospital Quality Star Ratings.

Background/objective: The Centers for Medicare & Medicaid Services (CMS) Overall Hospital Quality Star Rating, established in 2016, is a summary of publicly available quality information for acute care hospitals. In July 2023, Veterans Health Administration (VHA) hospitals became eligible to receive a CMS Overall Hospital Quality Star Rating for the first time. Our objective was to compare performance in quality ratings among VHA and non-VHA hospitals.