Publications by authors named "G Frebourg"

Article Synopsis
  • Mixtures of water and glycerol are commonly used for low-temperature spectroscopy, but they exhibit unexpected behaviors, like nanoscopic phase separations (NPS) that can go unnoticed.
  • These phase separations can dramatically impact dynamic nuclear polarization (DNP) efficiency, altering the local concentration of polarization agents by up to 20%.
  • Specifically, the NPS occurs over 30-60 minutes, leading to the formation of nanoscopic water-rich vesicles that affect the distribution and effectiveness of popular polarization agents like TEMPOL, AMUPol, and Trityl.
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In the field of nanotechnologies, theranostic approaches and fixed-dose combination products require the development of innovative carriers able to co-encapsulate several entities of interest. This communication describes the preparation and characterization of lipid-based Janus compartmented nanoparticles. They were successfully prepared using a scalable process with pharmaceutically approved excipients.

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Poorly water-soluble and unstable compounds are difficult to develop as drug products using conventional formulation techniques. The aim of the present study was to develop and evaluate a nanoformulation prepared by a hot high-pressure homogenization method, which was a scalable and solvent-free process. We successfully prepared stable nanodispersions to protect a labile antibiotic, erythromycin.

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Human mutations of the GRID1 gene encoding the orphan delta1 glutamate receptor-channel (GluD1) are associated with schizophrenia but the explicit role of GluD1 in brain circuits is unknown. Based on the known function of its paralog GluD2 in cerebellum, we searched for a role of GluD1 in slow glutamatergic transmission mediated by metabotropic receptor mGlu1 in midbrain dopamine neurons, whose dysfunction is a hallmark of schizophrenia. We found that an mGlu1 agonist elicits a slow depolarizing current in HEK cells co-expressing mGlu1 and GluD1, but not in cells expressing mGlu1 or GluD1 alone.

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Aim: Formulate nanometric oil droplets for encapsulating solid nanoparticles and assess their interactions with cells.

Materials & Methods: Soybean oil droplets, stabilized by Pluronic F68 surfactant, incorporating hydrophobically modified fluorescent silica, nanoparticles were obtained. Cytotoxicity over time, internalization, subsequent intracellular localization and internalization pathways were assessed by microscopy (fluoresence and TEM) in vitro with HeLa cells.

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