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Brunetti G, Padovani F, De Pastina A, Rotella C, Monahan A, Hoffman SL, Jongo SA, Abdulla S, Corradin G, Pluschke G, Daubenberger C, Hegner M. Nanotechnological immunoassay for rapid label-free analysis of candidate malaria vaccines. NANOSCALE 2021; 13:2338-2349. [PMID: 33438712 DOI: 10.1039/d0nr08083g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Malaria is a life-threatening epidemic disease with half of the world's population at risk. Although its incidence rate has fallen since 2010, this ratio dramatically stalled between 2014 and 2018. New fast and optimized tools in vaccine analysis and seroconversion testing are critically needed. We developed a clinical diagnostic device based on piezo-actuated nanoresonators that perform as quantitative in situ calibrated nano-bio sensors for specific detection of multiple target molecules in serum samples. The immunoassay successfully diagnoses humoral immune responses induced by malaria vaccine candidates and reveals the timeline and stage of the infection. We applied the newly developed strategy to a variety of different samples, from pure antibody/vaccine solutions, to blood samples from clinical trials on both naïve and pre-exposed malaria volunteers from sub-Saharan countries. Our nanomechanical assay provides a direct one-step label-free quantitative immunoassay that is on par with the gold-standard, multi-step enzyme-linked immunosorbent assay (ELISA). We achieve a limit of detection of few pg ml-1, or sub-pM concentrations. The 6 μl sample volume allows more than 50 experiments from one finger prick. Furthermore, we simultaneously detected multiple analytes by differential functionalization of multiple sensors in parallel. The inherent differential read-out with in situ controls reduces false positive results. Due to the faster turnaround time, the minimal volume required and the automatized handling system, this technique has great potential for miniaturization and routine diagnostics in pandemic emergencies.
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Affiliation(s)
- Giulio Brunetti
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin, Ireland.
| | - Francesco Padovani
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin, Ireland. and Institute of Functional Epigenetics, Helmholtz Zentrum München (HMGU), Neuherberg 85764, Germany
| | - Annalisa De Pastina
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin, Ireland.
| | - Chiara Rotella
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin, Ireland.
| | - Amy Monahan
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin, Ireland.
| | | | - Said A Jongo
- Bagamoyo Research and Training Centre, Ifakara Health Institute, Bagamoyo, Tanzania
| | - Salim Abdulla
- Bagamoyo Research and Training Centre, Ifakara Health Institute, Bagamoyo, Tanzania
| | | | - Gerd Pluschke
- Medical Parasitology and Infection Biology Department, Molecular Immunology Unit, Swiss Tropical and Public Health Institute, Basel, Switzerland and University of Basel, Switzerland
| | - Claudia Daubenberger
- University of Basel, Switzerland and Medical Parasitology and Infection Biology Department, Clinical Immunology Unit, Swiss Tropical and Public Health Institute, Basel, Switzerland.
| | - Martin Hegner
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin, Ireland.
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Denardo A, Elli S, Federici S, Asperti M, Gryzik M, Ruzzenenti P, Carmona F, Bergese P, Naggi A, Arosio P, Poli M. BMP6 binding to heparin and heparan sulfate is mediated by N-terminal and C-terminal clustered basic residues. Biochim Biophys Acta Gen Subj 2020; 1865:129799. [PMID: 33232799 DOI: 10.1016/j.bbagen.2020.129799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 11/16/2020] [Accepted: 11/18/2020] [Indexed: 12/31/2022]
Abstract
BACKGROUND The bone morphogenetic protein 6 (BMP6) is a crucial inducer of hepcidin, the peptide hormone that regulates the iron availability in our body. Hepcidin expression is influenced by hepatic heparan sulfate (HS) and by heparin administration, suggesting BMP6 interaction with heparin/HS. The BMP2/4 subfamily has been deeply characterized to have a N-terminal heparin/HS binding domain (HBD), whose basic residues contact the sulfate groups on heparin and HS. Such detailed characterization is still required for other, structurally different BMPs, including BMP6. METHODS BMP6 peptides encompassing potential HBDs were analysed on heparin-functionalized plates and microcantilevers, and on membrane HS expressing CHO-K1 cells. Monomeric wild-type BMP6 and mutants were produced, substituting the basic residues with non-charged ones, and their affinity to the heparin-column was measured. The BMP6-heparin interaction was also predicted at atomic level by in silico molecular dynamics. RESULTS N-terminal and C-terminal BMP6 peptides showed high heparin affinity in solid-phase assays. The mutation of the two sites (R5L, R6S, R7L and K126N, K127N, R129S) abolished the heparin-binding activity of the recombinant monomeric BMP6. Monomeric BMP6 and peptides specifically bound to membrane HS of CHO-K1 cells through the same domains. Molecular dynamic studies supported the role of the two HBDs, suggesting a cooperative behaviour. CONCLUSIONS In BMP6, N-terminal (R5, R6, R7) and C-terminal (K126, K127, R129) domains mediate the interaction with heparin and HS. GENERAL SIGNIFICANCE This study provides the molecular mechanism supporting the use of heparin to sequester BMP6 and inhibit hepcidin expression, a novel clinical approach for high-hepcidin iron disorders.
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Affiliation(s)
- Andrea Denardo
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Stefano Elli
- G. Ronzoni Institute for Chemical and Biochemical Research, Via Giuseppe Colombo 81, 20133 Milan, Italy
| | - Stefania Federici
- Department of Mechanical and Industrial Engineering and INSTM, University of Brescia, Via Branze 38, 25123 Brescia, Italy
| | - Michela Asperti
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Magdalena Gryzik
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Paola Ruzzenenti
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Fernando Carmona
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Paolo Bergese
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Annamaria Naggi
- G. Ronzoni Institute for Chemical and Biochemical Research, Via Giuseppe Colombo 81, 20133 Milan, Italy
| | - Paolo Arosio
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Maura Poli
- Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy.
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The polyplex, protein corona, cell interplay: Tips and drawbacks. Colloids Surf B Biointerfaces 2018; 168:60-67. [DOI: 10.1016/j.colsurfb.2018.01.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/23/2017] [Accepted: 01/20/2018] [Indexed: 12/12/2022]
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de Puig H, Bosch I, Gehrke L, Hamad-Schifferli K. Challenges of the Nano-Bio Interface in Lateral Flow and Dipstick Immunoassays. Trends Biotechnol 2017; 35:1169-1180. [PMID: 28965747 PMCID: PMC5696013 DOI: 10.1016/j.tibtech.2017.09.001] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 09/05/2017] [Accepted: 09/07/2017] [Indexed: 12/19/2022]
Abstract
Lateral flow assays (LFAs) are highly attractive for point-of-care (POC) diagnostics for infectious disease, food safety, and many other medical uses. The unique optical, electronic, and chemical properties that arise from the nanostructured and material characteristics of nanoparticles provide an opportunity to increase LFA sensitivity and impart novel capabilities. However, interfacing to nanomaterials in complex biological environments is challenging and can result in undesirable side effects such as non-specific adsorption, protein denaturation, and steric hindrance. These issues are even more acute in LFAs where there are many different types of inorganic-biological interfaces, often of a complex nature. Therefore, the unique properties of nanomaterials for LFAs must be exploited in a way that addresses these interface challenges.
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Affiliation(s)
- Helena de Puig
- Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
| | - Irene Bosch
- Institute for Medical Engineering and Science, MIT, Cambridge, MA, USA
| | - Lee Gehrke
- Institute for Medical Engineering and Science, MIT, Cambridge, MA, USA; Department of Microbiology and Immunology, Harvard Medical School, Boston, MA, USA
| | - Kimberly Hamad-Schifferli
- Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA; Department of Engineering, University of Massachusetts Boston, Boston, MA, USA.
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5
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Padovani F, Duffy J, Hegner M. Nanomechanical clinical coagulation diagnostics and monitoring of therapies. NANOSCALE 2017; 9:17939-17947. [PMID: 29125171 DOI: 10.1039/c7nr06992h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Clinical coagulation diagnostics often requires multiple tests. Coagulation times are a first indication of an abnormal coagulation process, such as a coagulation factor deficiency. To determine the specific deficient factor, additional immuno- and/or enzyme assays are necessary. Currently, every clinical laboratory has to normalize their assays (international normalized ratio, INR), and therefore, certain variability within the clinical analytics exists. We report a novel strategy for a quick, reliable and quantitative diagnosis of blood coagulation diseases (e.g. haemophilia) and for monitoring factor replacement and anticoagulant therapies (e.g. heparin treatment). We exploit nano-oscillations of microcantilevers for real-time measurements of the evolving blood plasma clot strength (viscosity). The sensors are oscillated at multiple high resonance mode numbers, in order to minimise the oscillation amplitude (a few nanometers), to provide direct internal control and to increase the quality factor. Along with the activated thromboplastin time (aPTT) and prothrombin time (PT) other parameters important for thrombosis diagnostics can be obtained, including the final clot strength and the fibrinolysis time. We demonstrate the dependence of the parameters on factor deficiencies and we diagnose a specific factor deficiency through an integrated and quantitative in situ immunoassay. This approach does not require continuous calibration since it delivers an absolute quantity (clot strength). The low sample volume required (a few μl) and the ability to measure different parameters within the same test (PT, aPTT and global coagulation assay) make the presented technique a versatile point-of-care device for clinical coagulation diagnostics.
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Affiliation(s)
- Francesco Padovani
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Ireland.
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Federici S, Padovani F, Poli M, Rodriguez FC, Arosio P, Depero LE, Bergese P. Energetics of surface confined ferritin during iron loading. Colloids Surf B Biointerfaces 2016; 145:520-525. [DOI: 10.1016/j.colsurfb.2016.05.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 05/06/2016] [Accepted: 05/16/2016] [Indexed: 12/22/2022]
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Cross MC, Toomey RG, Gallant ND. Protein-surface interactions on stimuli-responsive polymeric biomaterials. ACTA ACUST UNITED AC 2016; 11:022002. [PMID: 26942693 DOI: 10.1088/1748-6041/11/2/022002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Responsive surfaces: a review of the dependence of protein adsorption on the reversible volume phase transition in stimuli-responsive polymers. Specifically addressed are a widely studied subset: thermoresponsive polymers. Findings are also generalizable to other materials which undergo a similarly reversible volume phase transition. As of 2015, over 100,000 articles have been published on stimuli-responsive polymers and many more on protein-biomaterial interactions. Significantly, fewer than 100 of these have focused specifically on protein interactions with stimuli-responsive polymers. These report a clear trend of increased protein adsorption in the collapsed state compared to the swollen state. This control over protein interactions makes stimuli-responsive polymers highly useful in biomedical applications such as wound repair scaffolds, on-demand drug delivery, and antifouling surfaces. Outstanding questions are whether the protein adsorption is reversible with the volume phase transition and whether there is a time-dependence. A clear understanding of protein interactions with stimuli-responsive polymers will advance theoretical models, experimental results, and biomedical applications.
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Affiliation(s)
- Michael C Cross
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
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Sanfeld A, Royer C, Steinchen A. Thermodynamic, kinetic and conformational analysis of proteins diffusion-sorption on a solid surface. Adv Colloid Interface Sci 2015; 222:639-60. [PMID: 25433959 DOI: 10.1016/j.cis.2014.10.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Revised: 10/23/2014] [Accepted: 10/23/2014] [Indexed: 11/19/2022]
Abstract
In this paper we examine particularly some of the more fundamental properties of protein conformational changes at a solid surface coupled with diffusion from the bulk of an aqueous solution and with the adsorption-desorption processes. We focus our attention on adsorbed protein monolayers upon a solid surface using a thermodynamic and kinetic analytical development. Account is also taken of the effects on the overall rate of the conformational change on a solid surface of deviation from ideality, of protein flexibility, of surface free energy and of interaction with reactive solid sites. Our theory applied to steady states is illustrated by examples such as folding-misfolding-unfolding of RNase and SNase on a solid surface after diffusion and adsorption from an aqueous solution. For this purpose, we put forward the determining steps which shall lead to the steady state. The existence of three situations is highlighted according to the values of the typical constants relevant for the protein considered: reaction rate determining step, diffusion and sorption determining steps, mixed adsorption diffusion and reaction rate. Finally, we have tried to link the developments of our theories to a large literature based on experimental results encountered during proteins diffusion-sorption-reaction processes, fundamental topics that has been since long investigated by Miller's team in MPKG.
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Affiliation(s)
- Albert Sanfeld
- MADIREL UMR 7246 Aix-Marseille University, Bd Escadrille Normandie Niemen, 13397, Marseille Cedex 20, France
| | - Catherine Royer
- Centre de Biochimie Structurale, INSERM U554, CNRS UMR 5048, 29, rue de Navacelles, 34090 Montpellier, France
| | - Annie Steinchen
- MADIREL UMR 7246 Aix-Marseille University, Bd Escadrille Normandie Niemen, 13397, Marseille Cedex 20, France
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Biavardi E, Federici S, Tudisco C, Menozzi D, Massera C, Sottini A, Condorelli GG, Bergese P, Dalcanale E. Cavitand-Grafted Silicon Microcantilevers as a Universal Probe for Illicit and Designer Drugs in Water. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201404774] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Biavardi E, Federici S, Tudisco C, Menozzi D, Massera C, Sottini A, Condorelli GG, Bergese P, Dalcanale E. Cavitand-grafted silicon microcantilevers as a universal probe for illicit and designer drugs in water. Angew Chem Int Ed Engl 2014; 53:9183-8. [PMID: 24909594 DOI: 10.1002/anie.201404774] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Indexed: 02/04/2023]
Abstract
The direct, clean, and unbiased transduction of molecular recognition into a readable and reproducible response is the biggest challenge associated to the use of synthetic receptors in sensing. All possible solutions demand the mastering of molecular recognition at the solid-liquid interface as prerequisite. The socially relevant issue of screening amine-based illicit and designer drugs is addressed by nanomechanical recognition at the silicon-water interface. The methylamino moieties of different drugs are all first recognized by a single cavitand receptor through a synergistic set of weak interactions. The peculiar recognition ability of the cavitand is then transferred with high fidelity and robustness on silicon microcantilevers and harnessed to realize a nanomechanical device for label-free detection of these drugs in water.
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Affiliation(s)
- Elisa Biavardi
- Dipartimento di Chimica, Università degli Studi di Parma and INSTM Udr Parma, Parco Area delle Scienze 17A, 43124 Parma (Italy)
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11
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Nanomechanics of surface DNA switches probed by captive contact angle. J Colloid Interface Sci 2013; 402:334-9. [PMID: 23647692 DOI: 10.1016/j.jcis.2013.03.069] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 03/26/2013] [Accepted: 03/27/2013] [Indexed: 01/09/2023]
Abstract
Self-assembled monolayers of Thrombin Binding Aptamers (TBA) were prepared on gold surfaces with typical surface densities of close-packed ssDNA (4×10(12) and 8×10(12)molecules/cm(2)). CONtact Angle MOlecular REcognition (CONAMORE) in captive bubble geometry was then assessed to scan the surface work triggered by TBAs when switching from the elongated to the G-quadruplex conformation upon binding with Na(+) or K(+) cations. We found Na(+) and K(+) could induce comparable linear to G-quadruplex strokes, and resulted in values for surface work of ~-70 pN nm/molecule (~18 kBT). The strokes change the in-plane van der Waals and weak electrostatic interactions and accumulate to result in macroscopic surface work. Micro- to macroscopic translation strongly depends on the nature of the cation and TBA surface density. In particular, the K(+) stimulus triggers a macroscopic surface work of -2.2±0.2 and -5.3±0.2 mN/m for low and high packed monolayers, respectively, while Na(+) triggers up to -6.7±1.0 mN/m in the highly packed monolayer, but creates negligible work for the low packed monolayer. These results show that CONAMORE can contribute important information for the development of devices based on DNA switches, and ultimately help address some of the open challenges for DNA-based nanomachinery.
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Kosaka PM, Tamayo J, Ruz JJ, Puertas S, Polo E, Grazu V, de la Fuente JM, Calleja M. Tackling reproducibility in microcantilever biosensors: a statistical approach for sensitive and specific end-point detection of immunoreactions. Analyst 2012; 138:863-72. [PMID: 23223515 DOI: 10.1039/c2an36192b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In the last decade, microcantilever biosensors have shown enormous potential for highly sensitive label-free detection of nucleic acid and proteins. Despite the enormous advances, the promise of applications of this technology in the biomedical field has been frustrated because of its low reproducibility. Here we tackle the reproducibility issue in microcantilever biosensors and provide the guidelines to minimize the deviations in the biosensor response between different assays. We use as a model system the label-free end-point detection of horseradish peroxidase. We choose the end-point detection mode because of its suitability for implementation in the clinical field that requires simplicity and point-of-care capability. Our study comprises the analysis of 1012 cantilevers with different antibody surface densities, two blocking strategies based on polyethylene-glycol (PEG) and bovine serum albumin (BSA) and stringent controls. The study reveals that the performance of the assay critically depends on both antibody surface density and blocking strategies. We find that the optimal conditions involve antibody surface densities near but below saturation and blocking with PEG. We find that the surface stress induced by the antibody-antigen binding is significantly correlated with the surface stress generated during the antibody attachment and blocking steps. The statistical correlation is harnessed to identify immobilization failure or success, and thus enhancing the specificity and sensitivity of the assay. This procedure enables achieving rates of true positives and true negatives of 90% and 91% respectively. The detection limit is of 10 ng mL(-1) (250 pM) that is similar to the detection limit obtained in our enzyme-linked immunosorbent assay (ELISA) and at least two orders of magnitude smaller than that achieved with well-established label-free biosensors such as a quartz crystal microbalance (QCM) and surface plasmon resonance (SPR) sensor.
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Affiliation(s)
- Priscila M Kosaka
- Instituto de Microelectrónica de Madrid, CSIC, Issac Newton 8, 28760 Tres Cantos, Madrid, Spain
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Maiolo D, Mitola S, Leali D, Oliviero G, Ravelli C, Bugatti A, Depero LE, Presta M, Bergese P. Role of nanomechanics in canonical and noncanonical pro-angiogenic ligand/VEGF receptor-2 activation. J Am Chem Soc 2012; 134:14573-9. [PMID: 22860754 DOI: 10.1021/ja305816p] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Vascular endothelial growth factor receptor-2 (VEGFR2) is an endothelial cell receptor that plays a pivotal role in physiologic and pathologic angiogenesis and is a therapeutic target for angiogenesis-dependent diseases, including cancer. By leveraging on a dedicated nanomechanical biosensor, we investigated the nanoscale mechanical phenomena intertwined with VEGFR2 surface recognition by its prototypic ligand VEGF-A and its noncanonical ligand gremlin. We found that the two ligands bind the immobilized extracellular domain of VEGFR2 (sVEGFR2) with comparable binding affinity. Nevertheless, they interact with sVEGFR2 with different binding kinetics and drive different in-plane piconewton intermolecular forces, suggesting that the binding of VEGF-A or gremlin induces different conformational changes in sVEGFR2. These behaviors can be effectively described in terms of a different "nanomechanical affinity" of the two ligands for sVEGFR2, about 16-fold higher for VEGF-A with respect to gremlin. Such nanomechanical differences affect the biological activity driven by the two angiogenic factors in endothelial cells, as evidenced by a more rapid VEGFR2 clustering and a more potent mitogenic response triggered by VEGF-A in respect to gremlin. Together, these data point to surface intermolecular interactions on cell membrane between activated receptors as a key modulator of the intracellular signaling cascade.
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Affiliation(s)
- Daniele Maiolo
- Chemistry for Technologies Laboratory and INSTM, School of Engineering, University of Brescia, Via Branze, 38, 25123 Brescia, Italy
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