New nanostructures inhibiting human mannose binding lectin identified by a novel surface plasmon resonance assay

Erol, Gizem; Schmidt, Patricia Perez; Pancaro, Alessia; Diaz, Javier Melo; Barrientos, África G.; Porter, John; Polito, Laura; Szymonik, Michal; Nelissen, Inge; Spencer, Daniel I. R.; Piotti, Arianna; Beeg, Marten; Simoni, Maria-Grazia De; Fumagalli, Stefano; Gobbi, Marco

doi:10.1016/j.snb.2022.131661

Cited by 1 publication

(2 citation statements)

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“…For high-affinity MBL recognition and binding, we developed so-called Man-EG 6 C 11 S-coated GNRs, consisting of monovalent mannose coupled onto the GNR surfaces using an amphiphilic linker (EG 6 C 11 –SH) containing six units of ethylene glycol. Similarly Man-EG 6 C 11 S-coated gold nanospheres have recently shown promising results as MBL inhibitors using an SPR-based assay . The highly flexible chain of polyethylene glycol (PEG) can adopt a wide variety of conformations making undesired interactions with proteins or other blood components under physiological conditions thermodynamically unfavorable .…”

Section: Introductionmentioning

confidence: 99%

“…Similarly Man-EG 6 C 11 S-coated gold nanospheres have recently shown promising results as MBL inhibitors using an SPR-based assay. 31 The highly flexible chain of polyethylene glycol (PEG) can adopt a wide variety of conformations making undesired interactions with proteins or other blood components under physiological conditions thermodynamically unfavorable. 32 Moreover, due to the hydrophilic nature of the ethylene glycol chain, it generates a hydrated cloud leading to a low attraction of surrounding proteins.…”

Section: Introductionmentioning

confidence: 99%

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A Nanoplasmonic Assay for Point-of-Care Detection of Mannose-Binding Lectin in Human Serum

Pancaro,

Szymonik,

Perez Schmidt

et al. 2024

ACS Appl. Mater. Interfaces

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Mannose-binding lectin (MBL) activates the complement system lectin pathway and subsequent inflammatory mechanisms. The incidence and outcome of many human diseases, such as brain ischemia and infections, are associated with and influenced by the activity and serum concentrations of MBL in body fluids. To quantify MBL levels, tests based on ELISA are used, requiring several incubation and washing steps and lengthy turnaround times. Here, we aimed to develop a nanoplasmonic assay for direct MBL detection in human serum at the point of care. Our assay is based on gold nanorods (GNRs) functionalized with mannose (Man-GNRs) via an amphiphilic linker. We experimentally determined the effective amount of sugar linked to the nanorods' surface, resulting in an approximate grafting density of 4 molecules per nm 2 , and an average number of 11 to 13 MBL molecules binding to a single nanoparticle. The optimal Man-GNRs concentration to achieve the highest sensitivity in MBL detection was 15 μg•mL −1 . The specificity of the assay for MBL detection both in simple buffer and in complex pooled human sera was confirmed. Our label-free biosensor is able to detect MBL concentrations as low as 160 ng•mL −1 within 15 min directly in human serum via a one-step reaction and by using a microplate reader. Hence, it forms the basis for a fast, noninvasive, point-of-care assay for diagnostic indications and monitoring of disease and therapy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%