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A Novel Polarized Light Microscope for the Examination of Birefringent Crystals in Synovial Fluid.
Gout Urate Cryst Depos Dis
December 2024
Electrical and Computer Engineering Department, University of California, Los Angeles, CA 90095, USA.
Background: The gold standard for crystal arthritis diagnosis relies on the identification of either monosodium urate (MSU) or calcium pyrophosphate (CPP) crystals in synovial fluid. With the goal of enhanced crystal detection, we adapted a standard compensated polarized light microscope (CPLM) with a polarized digital camera and multi-focal depth imaging capabilities to create digital images from synovial fluid mounted on microscope slides. Using this single-shot computational polarized light microscopy (SCPLM) method, we compared rates of crystal detection and raters' preference for image.
View Article and Find Full Text PDFReappraisal of the fundamental mechanisms of the sHA14-1 molecule as a Bcl-2/Bcl-XL ligand in the context of anticancer therapy: A cell biological study.
J Biol Methods
December 2024
National Center for Scientific Research UMR 8003, Paris City University, SSPIN Neuroscience Institute, Saint-Germain Campus, Paris, Île de France 75006, France.
Background: HA14-1 is a small-molecule, stable B-cell lymphoma 2 (Bcl-2) antagonist that promotes apoptosis in malignant cells through an incompletely-defined mechanism of action. Bcl-2 and related anti-apoptotic proteins, such as B-cell lymphoma-extra-large [Bcl-XL]), are predominantly localized to the outer mitochondrial membrane, where they regulate cell death pathways. However, the notably short half-life of HA14-1 limits its potential therapeutic application.
View Article and Find Full Text PDFMINFLUX Nanoscopy: A "Brilliant" Technique Promising Major Breakthrough.
Microsc Res Tech
January 2025
Dipartimento di Fisica, Università di Genova, Genova, Italy.
MINFLUX nanoscopy relies on the localization of single fluorophores with expected ~ 2 nm precision in 3D mapping, roughly one order of magnitude better than standard stimulated emission depletion microscopy or stochastic optical reconstruction microscopy. This "brilliant" technique takes advantage of specialized localization principles and algorithms that require only dim fluorescence signals with a minimum flux of photons; hence the name follows. With this level of performance, MINFLUX imaging and tracking should allow for the routine study of biological processes down to the molecular scale, revealing previously unresolved details in cell structures, such as the organization of calcium channels in muscle cells or the clustering of receptors in synapses.
View Article and Find Full Text PDFSuccinate receptor 1 signaling mutually depends on subcellular localization and cellular metabolism.
FEBS J
January 2025
Rudolf Schönheimer Institute of Biochemistry, Medical Faculty, Leipzig University, Germany.
Succinate is a pivotal tricarboxylic acid cycle metabolite but also specifically activates the G- and G-coupled succinate receptor 1 (SUCNR1). Contradictory roles of succinate and succinate-SUCNR1 signaling include reports about its anti- or pro-inflammatory effects. The link between cellular metabolism and localization-dependent SUCNR1 signaling qualifies as a potential cause for the reported conflicts.
View Article and Find Full Text PDFDistinct subcellular localization of tau and alpha-synuclein in lewy body disease.
Acta Neuropathol Commun
January 2025
Center for Neurodegeneration and Experimental Therapeutics, Department of Neurology, University of Alabama at Birmingham, Birmingham, AL, USA.
Lewy bodies and neurofibrillary tangles, composed of α-synuclein (α-syn) and tau, respectively, often are found together in the same brain and correlate with worsening cognition. Human postmortem studies show colocalization of α-syn and tau occurs in Lewy bodies, but with limited effort to quantify colocalization. In this study, postmortem middle temporal gyrus tissue from decedents (n = 9) without temporal lobe disease (control) or with Lewy body disease (LBD) was immunofluorescently labeled with antibodies to phosphorylated α-syn (p-α-syn), tau phosphorylated at Ser202/Thr205 (p-tau), or exposure of tau's phosphatase-activating domain (PAD-tau) as a marker of early tau aggregates.
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