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Basic Science and Pathogenesis.
Alzheimers Dement
December 2024
Pacific Brain Health Center, Pacific Neuroscience Institute Foundation, Santa Monica, CA, USA.
Background: Brain accumulation of amyloid-ß (Aß) in plaques and neurons is the cause of AD neuropathology that is opposed by autologous monocyte/macrophages (MMs) in health but this defense fails in AD.
Method: RNAseq, immunochemistry of the brain, immunofluorescence, and confocal microscopy of macrophages.
Result: In the AD brain, MMs shuttle Aß from parenchyma to vessels, which develop vasculitis, causing amyloid-related imaging abnormalities (ARIAs).
Basic Science and Pathogenesis.
Alzheimers Dement
December 2024
Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA.
Background: Multiple AD risk genes are implicated in lipid metabolism, and plasma and brain lipid levels are altered in AD. Astrocytes are enriched in key lipid-related factors and are likely contributors to altered lipid homeostasis in AD. We hypothesize that APP/Aβ-related pathology and neuroimmune factors modulate astrocytic gene transcription that promote maladaptive changes in lipid pathways, including aberrant astrocytic production and release of lipids that could affect Aβ pathology and neuronal deficits.
View Article and Find Full Text PDFGastrodin protects against sepsis-associated encephalopathy by suppressing ferroptosis.
Shock
December 2024
Department of Pathology and Pathophysiology, Faculty of Basic Medical Science, Kunming Medical University, Kunming 650500, Yunnan, China.
Background: Sepsis-associated encephalopathy (SAE) represents a severe complication of sepsis, substantially elevating both mortality and healthcare costs for patients. Gastrodin (GAS), a principal bioactive constituent of Gastrodia elata Blume, is neuroprotective in various neurological disorders, including ischemic stroke, epilepsy, Alzheimer's disease, and neuropathic pain. In this study, we sought to investigate whether GAS could serve as a protective agent against SAE.
View Article and Find Full Text PDFPGE and HCN2 ion channels are critical mediators of pain initiated by angiotensin II.
Brain Behav Immun
December 2024
Wolfson Sensory, Pain and Regeneration Centre, King's College London, Guy's Campus, London Bridge, London SE1 1UL, UK. Electronic address:
Angiotensin II is well known to have an important influence on blood pressure, mediated via the angiotensin II type 1 receptor (AT1R), and more recent studies have shown that angiotensin II may play an important additional role in eliciting pain via a distinct action at the angiotensin II type 2 receptor (AT2R). Signalling pathways that link activation of AT2R to a sensation of pain are, however, incompletely understood. Here we use rodent inflammatory pain models to confirm that selective activation of AT2R triggers aversive responses, and that these are abolished by either antagonism or genetic deletion of AT2R.
View Article and Find Full Text PDFCelecoxib paradoxically induces COX-2 expression and astrocyte activation through the ERK/JNK/AP-1 signaling pathway in the cerebral cortex of rats.
Neurochem Int
December 2024
Master and PhD Programs in Pharmacology and Toxicology, School of Medicine, Tzu Chi University, Hualien, 970, Taiwan; Department of Pharmacology, School of Medicine, Tzu Chi University, Hualien, 970, Taiwan. Electronic address:
Previous studies have shown that celecoxib or NSAID may paradoxically induce cyclooxygenase-2 (COX-2) expression and trigger inflammation-like responses in airway smooth muscle cells and renal mesangial cells. Despite the extensive research on celecoxib, its atypical biological effect on the induction of COX-2 in astroglial cells within the central nervous system (CNS) remains unexplored. In the present study, we investigated the impact of celecoxib on COX-2 and Glial Fibrillary Acidic Protein (GFAP) expression and explored the mechanisms underlying celecoxib-regulated COX-2 expression in cortical astrocytes of rats.
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