Imperial College London

Professor Tony Cass

Faculty of Natural SciencesDepartment of Chemistry

Professor of Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 5195t.cass

 
 
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Location

 

301KMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Publication Type
Year
to

261 results found

Sharma S, Howells O, Rajendran N, Mcintyre S, Amini-Asl S, Henri P, Liu Y, Guy O, Cass AEG, Morris MCet al., 2019, Microneedle array-based platforms for future theranostic applications., Chembiochem

Theranostics involves finding the biomarkers of a disease, fighting them through site specific drug delivery and following them for prognosis of the disease. Microneedle array technology has been used for drug delivery and extended for continuous monitoring of analytes present in the skin compartment. We envisage the use of microneedle arrays for future theranostic applications. The potential of using combined microneedle array-based drug delivery and diagnostics as part of closed-loop control system for the management of diseases and delivery of precision drugs in individual patients, is reported in this paper.

JOURNAL ARTICLE

Hansel CS, Crowder SW, Cooper S, Gopal S, Pardelha da Cruz MJ, Martins LDO, Keller D, Rothery S, Becce M, Cass AEG, Bakal C, Chiappini C, Stevens MMet al., 2019, Nanoneedle-Mediated Stimulation of Cell Mechanotransduction Machinery, ACS NANO, Vol: 13, Pages: 2913-2926, ISSN: 1936-0851

JOURNAL ARTICLE

Liang S, Kinghorn AB, Voliotis M, Prague JK, Veldhuis JD, Tsaneva-Atanasova K, McArdle CA, Li RHW, Cass AEG, Dhillo WS, Tanner JAet al., 2019, Measuring luteinising hormone pulsatility with a robotic aptamer-enabled electrochemical reader, NATURE COMMUNICATIONS, Vol: 10, ISSN: 2041-1723

JOURNAL ARTICLE

Mie M, Matsumoto R, Mashimo Y, Cass AEG, Kobatake Eet al., 2019, Development of drug-loaded protein nanoparticles displaying enzymatically-conjugated DNA aptamers for cancer cell targeting, MOLECULAR BIOLOGY REPORTS, Vol: 46, Pages: 261-269, ISSN: 0301-4851

JOURNAL ARTICLE

Bollella P, Sharma S, Cass AEG, Antiochia Ret al., 2019, Minimally-invasive Microneedle-based Biosensor Array for Simultaneous Lactate and Glucose Monitoring in Artificial Interstitial Fluid, ELECTROANALYSIS, Vol: 31, Pages: 374-382, ISSN: 1040-0397

JOURNAL ARTICLE

Grell M, Dincer C, Le T, Lauri A, Bajo EN, Kasimatis M, Barandun G, Maier SA, Cass AEG, Guder Fet al., 2019, Autocatalytic Metallization of Fabrics Using Si Ink, for Biosensors, Batteries and Energy Harvesting, ADVANCED FUNCTIONAL MATERIALS, Vol: 29, ISSN: 1616-301X

JOURNAL ARTICLE

Rawson TM, Ming D, Gowers SAN, Freeman DME, Herrero P, Georgiou P, Cass AE, O'Hare D, Holmes AHet al., 2019, Public acceptability of computer-controlled antibiotic management: An exploration of automated dosing and opportunities for implementation, JOURNAL OF INFECTION, Vol: 78, Pages: 82-84, ISSN: 0163-4453

JOURNAL ARTICLE

Maniyam MN, Ibrahim AL, Cass AEG, 2019, Enhanced cyanide biodegradation by immobilized crude extract of Rhodococcus UKMP-5M, ENVIRONMENTAL TECHNOLOGY, Vol: 40, Pages: 386-398, ISSN: 0959-3330

JOURNAL ARTICLE

Bollella P, Sharma S, Cass AEG, Antiochia Ret al., 2019, Microneedle-based biosensor for minimally-invasive lactate detection, BIOSENSORS & BIOELECTRONICS, Vol: 123, Pages: 152-159, ISSN: 0956-5663

JOURNAL ARTICLE

Singh M, Nabavi E, Zhou Y, Gallina ME, Zhao H, Ruenraroengsak P, Porter AE, Ma D, Cass AEG, Hanna GB, Elson DSet al., 2019, Laparoscopic fluorescence image-guided photothermal therapy enhances cancer diagnosis and treatment., Nanotheranostics, Vol: 3, Pages: 89-102

Endoscopy is the gold standard investigation in the diagnosis of gastrointestinal cancers and the management of early and pre-malignant lesions either by resection or ablation. Recently gold nanoparticles have shown promise in cancer diagnosis and therapeutics (theranostics). The combination of multifunctional gold nanoparticles with near infrared fluorescence endoscopy for accurate mapping of early or pre-malignant lesions can potentially enhance diagnostic efficiency while precisely directing endoscopic near infrared photothermal therapy for established cancers. The integration of endoscopy with near infrared fluorescence imaging and photothermal therapy was aided by the accumulation of our multifunctionalized PEG-GNR-Cy5.5-anti-EGFR-antibody gold nanorods within gastrointestinal tumor xenografts in BALB/c mice. Control mice (with tumors) received either gold nanorods or photothermal therapy, while study mice received both treatment modalities. Local (tumor-centric) and systemic effects were examined for 30 days. Clear endoscopic near infrared fluorescence signals were observed emanating specifically from tumor sites and these corresponded precisely to the tumor margins. Endoscopic fluorescence-guided near infrared photothermal therapy successfully induced tumor ablations in all 20 mice studied, with complete histological clearance and minimal collateral damage. Multi-source analysis from histology, electron microscopy, mass spectrometry, blood, clinical evaluation, psychosocial and weight monitoring demonstrated the inherent safety of this technology. The combination of this innovative nanotechnology with gold standard clinical practice will be of value in enhancing the early optical detection of gastrointestinal cancers and a useful adjunct for its therapy.

JOURNAL ARTICLE

Loh AYY, Burgess CH, Tanase DA, Ferrar G, McLachlan MA, Cass AEG, Albrecht Tet al., 2018, Electric Single-Molecule Hybridization Detector for Short DNA Fragments, ANALYTICAL CHEMISTRY, Vol: 90, Pages: 14063-14071, ISSN: 0003-2700

JOURNAL ARTICLE

Piletsky SS, Cass AEG, Piletska E, Czulak J, Piletsky SAet al., 2018, A Novel Assay Format as an Alternative to ELISA: MINA Test for Biotin, CHEMNANOMAT, Vol: 4, Pages: 1214-1222, ISSN: 2199-692X

JOURNAL ARTICLE

Panagiotopoulos A, Gkouma A, Vassi A, Johnson CJ, Cass AEG, Topoglidis Eet al., 2018, Hemin Modified SnO2 Films on ITO-PET with Enhanced Activity for Electrochemical Sensing, ELECTROANALYSIS, Vol: 30, Pages: 1956-1964, ISSN: 1040-0397

JOURNAL ARTICLE

Rawson TM, Gowers S, Rogers M, Sallabank E, Sharma S, Georgiou P, Holmes AH, Cass T, O'Hare Det al., 2018, Towards a minimally invasive device for continuous monitoring of beta-lactam antibiotics, Publisher: ELSEVIER SCI LTD, Pages: 109-109, ISSN: 1201-9712

CONFERENCE PAPER

Maniyam MN, Ibrahim AL, Cass AEG, 2018, Decolourization and biodegradation of azo dye methyl red by Rhodococcus strain UCC 0016., Environ Technol, Pages: 1-15

In the present study, locally isolated Rhodococcus strains were attempted as biological tools for methyl red removal, a mutagenic azo dye posing threat to the environment if left untreated. Rhodococcus strain UCC 0016 demonstrated superior methyl red-decolourizing activity of 100% after 24 h at static condition in comparison to Rhodococcus strain UCC 0008 which recorded 65% decolourization after 72 h. Optimization of physicochemical parameters at 30°C, pH 7 and supplementing glucose as the carbon source resulted in improved methyl red-decolourizing activity at static condition and reduced the time taken to achieve complete decolourization by 80%. Higher concentration of methyl red (5 g/L) was able to be decolourized completely within 10 h by adopting the technology of immobilization. The encapsulated cells of Rhodococcus strain UCC 0016 demonstrated higher substrate affinity (Km = 0.6995 g/L) and an accelerated rate of disappearance of methyl red (Vmax = 0.3203 g/L/h) compared to the free cells. Furthermore, the gellan gum beads could be reused up to nine batches without substantial loss in the catalytic activity indicating the economic importance of this protocol. Analysis of methyl red degradation products revealed no germination inhibition on Triticum aestivum and Vigna radiata demonstrating complete toxicity removal of the parent dye after biological treatment. The occurrence of new and altered peaks (UV-Vis and FTIR) further supported the notion that the removal of methyl red by Rhodococcus strain UCC 0016 was indeed through biodegradation. Therefore, this strain has a huge potential as a candidate for efficient bioremediation of wastewater containing methyl red.

JOURNAL ARTICLE

Sharma S, El-Laboudi A, Reddy M, Jugnee N, Sivasubramaniyam S, El Sharkawy M, Georgiou P, Johnston D, Oliver N, Cass AEGet al., 2018, A pilot study in humans of microneedle sensor arrays for continuous glucose monitoring, ANALYTICAL METHODS, Vol: 10, Pages: 2088-2095, ISSN: 1759-9660

JOURNAL ARTICLE

Rawson TM, O'Hare D, Herrero P, Sharma S, Moore LSP, de Barra E, Roberts JA, Gordon AC, Hope W, Georgiou P, Cass AEG, Holmes AHet al., 2018, Delivering precision antimicrobial therapy through closed-loop control systems, JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY, Vol: 73, Pages: 835-843, ISSN: 0305-7453

JOURNAL ARTICLE

Singh M, Nabavi E, Zhou Y, Zhao H, Ma D, Cass A, Hanna G, Elson Det al., Fluorescence image-guided photothermal therapy: Diagnosis and treatment of upper gastrointestinal cancer and beyond (prize winner), Global Surgery

CONFERENCE PAPER

Cass AEG, Hill HAO, 2018, Nuclear magnetic resonance spectroscopy of copper proteins, Copper Proteins and Copper Enzymes, Pages: 63-91, ISBN: 9781315891804

© 1984 by CRC Press, Inc. Of all the techniques currently used to study macromolecules in solution, only nuclear magnetic resonance (NMR) spectroscopy has the power to reveal details of molecular structure and motion at atomic resolution.1–5Though the complexity of the spectra of most molecules of interest makes it difficult to express this power and capitalize on the information provided, recent advances in spectrometer design and data manipulation have considerably extended its range of fruitful applications. Compare, e.g., an early (about 1975) 1H NMR spectrum of azurin with one obtained recently (Figure 1) in which the increased resolution and signal-to-noise ratio are only two of the improved features apparent. Many other advances will be revealed in examples considered in detail later in this chapter. First, we provide a brief description of the object of our spectroscopic attentions and the salient features of the technique for those unfortunate to have not yet made its acquaintance.

BOOK CHAPTER

Sze JYY, Ivanov AP, Cass AEG, Edel JBet al., 2017, Single molecule multiplexed nanopore protein screening in human serum using aptamer modified DNA carriers, NATURE COMMUNICATIONS, Vol: 8, ISSN: 2041-1723

JOURNAL ARTICLE

Harris-Birtill D, Singh M, Zhou Y, Shah A, Ruenraroengsak P, Gallina ME, Hanna GB, Cass AEG, Porter AE, Bamber J, Elson DSet al., 2017, Gold nanorod reshaping in vitro and in vivo using a continuous wave laser, PLOS ONE, Vol: 12, ISSN: 1932-6203

JOURNAL ARTICLE

Rawson TM, Sharma S, Georgiou P, Holmes A, Cass A, O'Hare Det al., 2017, Towards a minimally invasive device for beta-lactam monitoring in humans, ELECTROCHEMISTRY COMMUNICATIONS, Vol: 82, Pages: 1-5, ISSN: 1388-2481

JOURNAL ARTICLE

Le TT, Chang P, Benton DJ, McCauley JW, Iqbal M, Cass AEGet al., 2017, Dual Recognition Element Lateral Flow Assay Toward Multiplex Strain Specific Influenza Virus Detection, ANALYTICAL CHEMISTRY, Vol: 89, Pages: 6781-6786, ISSN: 0003-2700

JOURNAL ARTICLE

Sharma S, Saeed A, Johnson C, Gadegaard N, Cass AEet al., 2017, Rapid, low cost prototyping of transdermal devices for personal healthcare monitoring., Sens Biosensing Res, Vol: 13, Pages: 104-108, ISSN: 2214-1804

The next generation of devices for personal healthcare monitoring will comprise molecular sensors to monitor analytes of interest in the skin compartment. Transdermal devices based on microneedles offer an excellent opportunity to explore the dynamics of molecular markers in the interstitial fluid, however good acceptability of these next generation devices will require several technical problems associated with current commercially available wearable sensors to be overcome. These particularly include reliability, comfort and cost. An essential pre-requisite for transdermal molecular sensing devices is that they can be fabricated using scalable technologies which are cost effective. We present here a minimally invasive microneedle array as a continuous monitoring platform technology. Method for scalable fabrication of these structures is presented. The microneedle arrays were characterised mechanically and were shown to penetrate human skin under moderate thumb pressure. They were then functionalised and evaluated as glucose, lactate and theophylline biosensors. The results suggest that this technology can be employed in the measurement of metabolites, therapeutic drugs and biomarkers and could have an important role to play in the management of chronic diseases.

JOURNAL ARTICLE

Cass AEG, Sharma S, 2017, Microneedle Enzyme Sensor Arrays for Continuous In Vivo Monitoring, ENZYMES AS SENSORS, Vol: 589, Pages: 413-427, ISSN: 0076-6879

JOURNAL ARTICLE

Sharma S, Takagi E, Cass T, Tsugawa W, Sode Ket al., 2017, Minimally invasive microneedle array electrodes employing direct electron transfer type glucose dehydrogenase for the development of continuous glucose monitoring sensors, BIOSENSORS 2016, Vol: 27, Pages: 208-209, ISSN: 2212-0173

JOURNAL ARTICLE

Sharma S, Huang Z, Rogers M, Boutelle M, Cass AEGet al., 2016, Evaluation of a minimally invasive glucose biosensor for continuous tissue monitoring, ANALYTICAL AND BIOANALYTICAL CHEMISTRY, Vol: 408, Pages: 8427-8435, ISSN: 1618-2642

JOURNAL ARTICLE

Hughes JT, O'Dea K, Piera K, Barzi F, Cass A, Hoy WE, MacIsaac RJ, Maple-Brown LJet al., 2016, Associations of serum adiponectin with markers of cardio-metabolic disease risk in Indigenous Australian adults with good health, diabetes and chronic kidney disease., Obes Res Clin Pract, Vol: 10, Pages: 659-672, ISSN: 1871-403X

The higher serum adiponectin concentrations observed in females are often attributed to differences in adiposity or sex hormones. There is little data describing adiponectin in Indigenous Australians, and no studies examining its association with cardio-metabolic disease risk markers and chronic kidney disease (CKD). AIM: To describe the relationship of serum adiponectin with cardio-metabolic disease risk markers and kidney function in a community-based sample of Indigenous Australian adults, with particular reference to sex-specific differences. METHODS: A cross-sectional analysis of a community-based volunteer sample of 548 Indigenous Australian adults (62% female), stratified into five cardio-metabolic risk groups ranging from good health (strata-1) to high cardio-metabolic risk and low measured glomerular filtration rate (mGFR, <60ml/min/1.73m2) (strata-5). We examined serum adiponectin concentrations with cardio-metabolic risk markers, albuminuria and mGFR. RESULTS: Indigenous Australian females had a lower than expected adiponectin concentration (3.5μg/ml), which was higher than males in strata 1-4 (as in other populations), but not in strata-5 (mGFR<60, p=0.19), and higher leptin: adiponectin ratio than other populations (7.8ng/μg - strata-1, healthy females; 12.2ng/μg - strata-3, females with diabetes and mGFR≥90). Female-gender, HDL-cholesterol (positive), mGFR and waist: hip ratio (WHR) (inverse) were independently associated with log-adiponectin when mGFR≥60; when mGFR<60, female-gender was associated with 0.27 units lower log-adiponectin. CONCLUSION: Female-gender was not associated with higher adiponectin concentrations in Indigenous Australians with mGFR<60ml/min/1.73m2. High WHR was frequent in both genders, and inversely associated with adiponectin. Longitudinal studies are needed to examine relationships of serum adiponectin, obesity and cardiovascular disease events in Indigenous Australians.

JOURNAL ARTICLE

Badve SV, Palmer SC, Strippoli GFM, Roberts MA, Teixeira-Pinto A, Boudville N, Cass A, Hawley CM, Hiremath SS, Pascoe EM, Perkovic V, Whalley GA, Craig JC, Johnson DWet al., 2016, The Validity of Left Ventricular Mass as a Surrogate End Point for All-Cause and Cardiovascular Mortality Outcomes in People With CKD: A Systematic Review and Meta-analysis., Am J Kidney Dis, Vol: 68, Pages: 554-563

BACKGROUND: Left ventricular mass (LVM) is a widely used surrogate end point in randomized trials involving people with chronic kidney disease (CKD) because treatment-induced LVM reductions are assumed to lower cardiovascular risk. The aim of this study was to assess the validity of LVM as a surrogate end point for all-cause and cardiovascular mortality in CKD. STUDY DESIGN: Systematic review and meta-analysis. SETTING & POPULATION: Participants with any stages of CKD. SELECTION CRITERIA FOR STUDIES: Randomized controlled trials with 3 or more months' follow-up that reported LVM data. INTERVENTION: Any pharmacologic or nonpharmacologic intervention. OUTCOMES: The surrogate outcome of interest was LVM change from baseline to last measurement, and clinical outcomes of interest were all-cause and cardiovascular mortality. Standardized mean differences (SMDs) of LVM change and relative risk for mortality were estimated using pairwise random-effects meta-analysis. Correlations between surrogate and clinical outcomes were summarized across all interventions combined using bivariate random-effects Bayesian models, and 95% credible intervals were computed. RESULTS: 73 trials (6,732 participants) covering 25 intervention classes were included in the meta-analysis. Overall, risk of bias was uncertain or high. Only 3 interventions reduced LVM: erythropoiesis-stimulating agents (9 trials; SMD, -0.13; 95% CI, -0.23 to -0.03), renin-angiotensin-aldosterone system inhibitors (13 trials; SMD, -0.28; 95% CI, -0.45 to -0.12), and isosorbide mononitrate (2 trials; SMD, -0.43; 95% CI, -0.72 to -0.14). All interventions had uncertain effects on all-cause and cardiovascular mortality. There were weak and imprecise associations between the effects of interventions on LVM change and all-cause (32 trials; 5,044 participants; correlation coefficient, 0.28; 95% credible interval, -0.13 to 0.59) and cardiovascular mortality (13 trials; 2,32

JOURNAL ARTICLE

Maple-Brown LJ, Hughes JT, Ritte R, Barzi F, Hoy WE, Lawton PD, Jones GRD, Death E, Simmonds A, Sinha AK, Cherian S, Thomas MAB, McDermott R, Brown ADH, O'Dea K, Jerums G, Cass A, MacIsaac RJet al., 2016, Progression of Kidney Disease in Indigenous Australians: The eGFR Follow-up Study., Clin J Am Soc Nephrol, Vol: 11, Pages: 993-1004

BACKGROUND AND OBJECTIVES: Indigenous Australians experience a heavy burden of CKD. To address this burden, the eGFR Follow-Up Study recruited and followed an Indigenous Australian cohort from regions of Australia with the greatest ESRD burden. We sought to better understand factors contributing to the progression of kidney disease. Specific objectives were to assess rates of progression of eGFR in Indigenous Australians with and without CKD and identify factors associated with a decline in eGFR. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: This observational longitudinal study of Indigenous Australian adults was conducted in >20 sites. The baseline cohort was recruited from community and primary care clinic sites across five strata of health, diabetes status, and kidney function. Participants were then invited to follow up at 2-4 years; if unavailable, vital status, progression to RRT, and serum creatinine were obtained from medical records. Primary outcomes were annual eGFR change and combined renal outcome (first of ≥30% eGFR decline with follow-up eGFR<60 ml/min per 1.73 m(2), progression to RRT, or renal death). RESULTS: Participants (n=550) were followed for a median of 3.0 years. Baseline and follow-up eGFR (geometric mean [95% confidence interval], 83.9 (80.7 to 87.3) and 70.1 (65.9 to 74.5) ml/min per 1.73 m(2), respectively. Overall mean annual eGFR change was -3.1 (-3.6 to -2.5) ml/min per 1.73 m(2). Stratified by baseline eGFR (≥90, 60-89, <60 ml/min per 1.73 m(2)), annual eGFR changes were -3.0 (-3.6 to -2.4), -1.9 (-3.3 to -0.5), and -5.0 (-6.5 to -3.6) ml/min per 1.73 m(2). Across baseline eGFR categories, annual eGFR decline was greatest among adults with baseline albumin-to-creatinine ratio (ACR) >265 mg/g (30 mg/mmol). Baseline determinants of the combined renal outcome (experienced by 66 participants) were higher urine ACR, diabetes, lower measured GFR, and higher C-reactive protein. CONCLUSIONS: The observed eGFR decline w

JOURNAL ARTICLE

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