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Development of an Advanced Diagnostic Concept for Intestinal Inflammation: Molecular Visualisation of Nitric Oxide in Macrophages by Functional Poly(lactic-

Development of an Advanced Diagnostic Concept for Intestinal Inflammation: Molecular Visualisation of Nitric Oxide in Macrophages by Functional Poly(lactic-

Kathleen Lange, Christian Lautenschläger, Maria Wallert, Stefan Lorkowski, Andreas Stallmach, Alexander Schiller

Beilstein J Nanotechnol. 2017 Aug 8;8:1637-1641.

PMID: 28875100

Abstract:

We here describe a new approach to visualise nitric oxide (NO) in living macrophages by fluorescent NO-sensitive microspheres based on poly(lactic-co-glycolic acid) (PLGA). PLGA microspheres loaded with NO550 dye were prepared through a modified solvent-evaporation method. Microparticles were characterized by a mean hydrodynamic diameter of 3000 nm, zeta potential of -26.000 ± 0.351 mV and a PDI of 0.828 ± 0.298. Under abiotic conditions, NO release was triggered through UV radiation (254 nm) of 10 mM sodium nitroprusside dehydrate (SNP). After incubation, AZO550 microspheres exhibited an about 8-fold increased emission at 550 nm compared to NO550 particles. For biotic NO release, RAW 264.7 murine macrophages were activated with lipopolysaccharide (LPS) of Salmonella typhimurium. After treatment with NO550 microparticles, only activated cells caused a green particle fluorescence and could be detected by laser scanning microscopy. NO release was confirmed indirectly with Griess reaction. Our functional NO550 particles enable a simple and early evaluation of inflammatory and immunological processes. Furthermore, our results on particle-based NO sensing and previous studies in targeting intestinal inflammation via (PLGA)-based microspheres demonstrate that an advanced concept for visualizing intestinal inflammation is tangible.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS743138	Green Fluorescent PLGA microspheres			Price

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