Recent studies suggest that the formyl-peptide-receptor-like-1 (FPRL1) plays an essential role in the inflammatory responses of host defense mechanisms and neurodegenerative disorders such as Alzheimer's disease (AD). We therefore analyzed whether amyloid beta1-42 (Abeta1-42) increased the activity of phospholipase D (PLD) via FPRL1, which is an enzyme involved in the secretion, endocytosis and receptor signaling. PLD activity was determined using a transphosphatidylation assay. The internalization of Abeta1-42 via FPRL1 was visualized using fluorescence microscopy and quantified by ELISA (Enzyme Linked Immunosorbent Assay). Determining receptor activity by extracellular-signal regulated kinases 1/2 (ERK1/2) phosphorylation and cAMP level measurement verified the Abeta1-42-induced activation of FPRL1. We were able to show that Abeta1-42 is rapidly internalized via FPRL1 in astrocytes and microglia. PLD was additionally activated by Abeta1-42 and via FPRL1 in rat glial cells. Furthermore, the ERK1/2 phosphorylation by FPRL1 agonists was dependent on the PLD product phosphatidic acid (PA). Together, these data suggest that PLD plays an important role in the regulation of Abeta1-42-induced endocytosis and FPRL1 receptor signaling.
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http://dx.doi.org/10.1016/j.neuroscience.2008.07.042 | DOI Listing |
JAMA Neurol
January 2025
Department of Neurology, Xuanwu Hospital Capital Medical University, National Center for Neurological Disorders, Beijing, China.
Importance: Autoantibodies targeting astrocytes, such as those against glial fibrillary acidic protein (GFAP) or aquaporin protein 4, are crucial diagnostic markers for autoimmune astrocytopathy among central nervous system (CNS) autoimmune disorders. However, diagnosis remains challenging for patients lacking specific autoantibodies.
Objective: To characterize a syndrome of unknown meningoencephalomyelitis associated with an astrocytic autoantibody.
Eur J Histochem
January 2025
Traditional Chinese Medicine Studio, The First Affiliated Hospital of Xiamen University; Integrated Traditional Chinese and Western Medicine Center, School of Medicine, Xiamen University, Xiamen.
This corrects the article published in European Journal of Histochemistry 2024;68:4140 doi: 10.4081/ejh.2024.
View Article and Find Full Text PDFInt J Eat Disord
January 2025
Institute of Anatomy, Rostock University Medical Center, Rostock, Germany.
Objective: Anorexia nervosa (AN) is an eating disorder characterized by severe weight loss and associated with hyperactivity and circadian rhythm disruption. However, the cellular basis of circadian rhythm disruption is poorly understood. Glial cells in the suprachiasmatic nucleus (SCN), the principal circadian pacemaker, are involved in regulating circadian rhythms.
View Article and Find Full Text PDFFront Cell Neurosci
January 2025
IDDRC, Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California - Los Angeles, Los Angeles, CA, United States.
Once believed to be the culprits of epileptogenic activity, the functional properties of balloon/giant cells (BC/GC), commonly found in some malformations of cortical development including focal cortical dysplasia type IIb (FCDIIb) and tuberous sclerosis complex (TSC), are beginning to be unraveled. These abnormal cells emerge during early brain development as a result of a hyperactive mTOR pathway and may express both neuronal and glial markers. A paradigm shift occurred when our group demonstrated that BC/GC in pediatric cases of FCDIIb and TSC are unable to generate action potentials and lack synaptic inputs.
View Article and Find Full Text PDFCureus
January 2025
Electrophysiology, 3Brain AG, Genova, ITA.
The natural product MGN-3 (Biobran) is a defatted, partially hydrolysed rice bran-derived hemicellulose enzymatically modified with an extract of . It has a high proportion of arabinoxylan. It has a protective action against intracerebroventricular streptozotocin-induced murine sporadic Alzheimer's disease and reverses spatial memory deficit in this disease model.
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