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Optimisation of the Investigation of Antibody-Mediated Dysglycaemia

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Optimisation of the Investigation of Antibody-Mediated Dysglycaemia Optimisation of the Investigation of Antibody-Mediated Dysglycaemia David Simon Church Emmanuel College University of Cambridge This dissertation is submitted for the degree of Doctor of Philosophy June 2019 Declaration I hereby declare that my thesis entitled: Optimisation of the Investigation of Antibody-Mediated Dysglycaemia This dissertation is the result of my own work and includes nothing which is the outcome of work done in collaboration except as declared in the Collaborations and Contributions and specified in the text. It is not substantially the same as any that I have submitted, or, is being concurrently submitted for a degree or diploma or other qualification at the University of Cambridge or any other University or similar institution. I further state that no substantial part of my dissertation has already been submitted, or, is being concurrently submitted for any such degree, diploma or other qualification at the University of Cambridge or any other University or similar institution. It does not exceed the prescribed word limit for the Degree Committee of the Faculty of Clinical Medicine. David S Church June 2019 i Summary Optimisation of the Investigation of Antibody-Mediated Dysglycaemia David S Church Two rare and severe disorders of insulin action, namely insulin autoimmune syndrome (IAS) and type B insulin resistance (TB-IR), are caused by pathogenic antibodies against insulin or the insulin receptor, respectively. These may arise in isolation or may complicate management of pre-existing diabetes mellitus, and milder forms of the conditions are often suspected in patients with insulin-treated diabetes and labile glycaemic control. Antibody depletion can effectively treat either condition in many cases. This research aimed to target major limitations of existing diagnostics, specifically, that anti- insulin antibody (IA) testing alone does not establish whether antibodies alter insulin action to a clinically-significant degree, and that no clinically-accredited diagnostic test for TB-IR currently exists. An initial collaborative study examined the ability of a panel of commercial insulin assays to quantify ten different insulin preparations. Significant variability in performance of assays against animal-derived and insulin analogues was seen, with certain insulin analogues not detected at all, with important implications for the use of insulin immunoassays in insulin-treated patients. A suite of techniques for investigation of the clinical significance of IAs were then developed and assessed. In a study of five widely-used insulin immunoassays, dilution of IAS plasma led to increased insulin recovery, and polyethylene glycol (PEG) precipitation of IAS plasma decreased insulin recovery in the majority of assays. Gel filtration chromatography (GFC) discriminated high molecular weight and monomeric insulin, while ex vivo addition of exogenous insulin to plasma increased sensitivity of insulin immunocomplex detection. An observational study was performed of 7 patients, all ultimately diagnosed with IAS. IAs were measured using radioligand-binding assay and enzyme-linked immunosorbent assay (ELISA). Method comparison showed results to differ in rank order and relative magnitude. For one patient whose screening IA result was not grossly elevated using either IA assay method, immunosubtraction studies were consistent with the presence of an IgA, a class of antibody under-/not detected in the IA assays studied. Competitive radioligand-binding studies demonstrated IAs to have a range of affinities. 4 patients treated with individualised regimens of immunosuppressive therapy varied in clinical response, and 3 were managed conservatively. Plasma insulin and C-peptide measurements made using mass spectrometry demonstrated under-estimation of insulin and over-estimation of C-peptide concentration using immunoassay in IAS. An observational laboratory and clinical study was also undertaken of 30 insulin-treated patients with diabetes and unexplained labile glycaemia. IA, and plasma insulin before and after PEG precipitation, were determined. Three groups were identified: the first were ‘negative’ for actionable IA; the second had demonstrable IAs of potential significance that warrant further study; and the third included 3 patients for whom immunomodulation therapy was indicated, with 1 other patient showing marked improvement of glycaemic control with close supervision and manipulation of insulin. Finally, anti-insulin receptor antibodies were detected using a newly developed ELISA utilising Chinese hamster ovary-expressed myc-tagged wild-type human insulin receptor. ‘Proof of principle’ was demonstrated for the new assay, with clear scope established for future diagnostic development. The ability to robustly prove, or conversely to rule out, the presence, of insulin–antibody complexes and/or anti-insulin receptor antibodies is invaluable in the investigation of patients with insulin resistance and/or unexplained labile glycaemia, and may decisively alter care pathways. Knowledge gained by this research has advanced understanding of the limitations of current laboratory diagnostics, and has thereby aided clinical-decision making for affected patients. ii Acknowledgements With gratitude to: My project supervisor Dr Robert Semple for giving me the opportunity to undertake this research, for exemplary mentorship, exceptional teaching, and meritorious patience. From grant application until completion, I was well-supported and, thanks to Robert, the research exceeded my expectations both in what was achieved academically and how much fun it was to do. My project co-supervisor Dr David Halsall without whose positive influence I would not have envisaged the academic opportunities that have been accessible to me. Whether it be from an argument about roc curves and reference ranges, a discussion about the utility of radioimmunoassays, or an explanation about why potholing can be best done in brogues, I continue to learn so much from David and I am a better doctor consequently. The Diabetes Research & Wellness Foundation for awarding me a Sutherland-Earl Clinical Research Fellowship in 2013. Severe Insulin Resistance Specialist Nurse Julie Harris. Research Associate Dr Gemma Brierley, and Research Assistants Rachel Knox and Cornelia Gewert. The staff of the Department of Clinical Biochemistry and Immunology, Cambridge University Hospitals NHS Foundation Trust, with special mention of Sonia Bradbury, Kevin Taylor, Vivian Nwakor, Andrew Howell, and Gamel Mahamah. The staff of Core Biochemical Assay Laboratory, with special mention of Keith Burling, Peter Barker, and Ashley Clarke. Those others who collaborated in this research, whose details are listed in the appendices against the relevant chapter, and to the patients. Pharmacist Lynn Martin for the support and guidance to help get the project started. Nick McArdle for his attempts to improve my written English. My father Raymond and mother Dorothy, and my siblings Philip, Sarah, and Andrew for their continued support. I dedicate this work to my mother whose unconditional care and immeasurable encouragement enabled me to reach my full potential. iii Collaborations and contributions Detection of insulin analogues in plasma using immunoassay Contributor Site Contribution Blood Sciences, Royal Devon and Dr Timothy J. Exeter Foundation Trust, UK; Led and designed study, prepared McDonald’s NIHR Exeter Clinical Research samples and analysed data group Facility, University of Exeter, UK NIHR Cambridge Biomedical Keith A. Burling Research Centre, Core Biochemical Analytical and technical support* Assay Laboratory Analytical and technical support; NIHR Cambridge Biomedical Training in setting up and performing Peter Barker Research Centre, Core Biochemical insulin assays using the DiaSorin Assay Laboratory LIAISON® XL, and the PE AutoDELFIA®* NIHR Cambridge Biomedical Ashley Clarke Research Centre, Core Biochemical Laboratory support* Assay Laboratory Department of Clinical Training in setting up and performing Biochemistry and Immunology, insulin assays using the Siemens Sonia Bradbury Cambridge University Hospitals ADVIA® Centaur, Siemens NHS Foundation Trust, Cambridge, IMMULITE® 2000* UK Department of Medical Analyses using the Abbott Dr Carol Evans Biochemistry & Immunology, ARCHITECT University Hospital of Wales, UK Department of Laboratory Dr Annie Analyses using the Beckman Access® Medicine, University Hospital Armston Ultrasensitive Southampton, UK Surrey Pathology Services, Royal Analyses using the Mercodia Insulin Dr Gwen Wark Surrey County Hospital, UK and Mercodia Iso-Insulin ELISA Blood Sciences, Royal Devon and Ceri Parfit Analyses using the Roche Elecsys® Exeter Foundation Trust, UK *David Church analysed samples using the Siemens ADVIA® Centaur, Siemens IMMULITE® 2000 (supervised by staff of the Endocrine Laboratory, Department of Clinical Biochemistry, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK), DiaSorin LIAISON® XL, and the PE AutoDELFIA® (supervised by staff of the Core Biochemical Assay Laboratory (CBAL), Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK. David Church carried out literature review, data interpretation, and writing of this chapter. iv Detection of insulin–antibody complexes in plasma Contributor Site Contribution Department of Endocrinology, Diabetes and Luís Cardoso Metabolism, Centro Hospitalar e Universitário de Referring clinician Coimbra, Coimbra, Portugal National Severe Insulin Resistance Service,
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