Title |
Pre-clinical characterisation of E2814, a high-affinity antibody targeting the microtubule-binding repeat domain of tau for passive immunotherapy in Alzheimer’s disease
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Published in |
Acta Neuropathologica Communications, February 2020
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DOI | 10.1186/s40478-020-0884-2 |
Pubmed ID | |
Authors |
Malcolm Roberts, Ioanna Sevastou, Yoichi Imaizumi, Kavita Mistry, Sonia Talma, Madhurima Dey, Jane Gartlon, Hiroshi Ochiai, Zhi Zhou, Shigeru Akasofu, Naoki Tokuhara, Makoto Ogo, Muneo Aoyama, Hirofumi Aoyagi, Kate Strand, Ezat Sajedi, Kishan Lal Agarwala, Jared Spidel, Earl Albone, Kanta Horie, James M. Staddon, Rohan de Silva |
Abstract |
Tau deposition in the brain is a pathological hallmark of many neurodegenerative disorders, including Alzheimer's disease (AD). During the course of these tauopathies, tau spreads throughout the brain via synaptically-connected pathways. Such propagation of pathology is thought to be mediated by tau species ("seeds") containing the microtubule binding region (MTBR) composed of either three repeat (3R) or four repeat (4R) isoforms. The tau MTBR also forms the core of the neuropathological filaments identified in AD brain and other tauopathies. Multiple approaches are being taken to limit tau pathology, including immunotherapy with anti-tau antibodies. Given its key structural role within fibrils, specifically targetting the MTBR with a therapeutic antibody to inhibit tau seeding and aggregation may be a promising strategy to provide disease-modifying treatment for AD and other tauopathies. Therefore, a monoclonal antibody generating campaign was initiated with focus on the MTBR. Herein we describe the pre-clinical generation and characterisation of E2814, a humanised, high affinity, IgG1 antibody recognising the tau MTBR. E2814 and its murine precursor, 7G6, as revealed by epitope mapping, are antibodies bi-epitopic for 4R and mono-epitopic for 3R tau isoforms because they bind to sequence motif HVPGG. Functionally, both antibodies inhibited tau aggregation in vitro. They also immunodepleted a variety of MTBR-containing tau protein species. In an in vivo model of tau seeding and transmission, attenuation of deposition of sarkosyl-insoluble tau in brain could also be observed in response to antibody treatment. In AD brain, E2814 bound different types of tau filaments as shown by immunogold labelling and recognised pathological tau structures by immunohistochemical staining. Tau fragments containing HVPGG epitopes were also found to be elevated in AD brain compared to PSP or control. Taken together, the data reported here have led to E2814 being proposed for clinical development. |
X Demographics
Geographical breakdown
Country | Count | As % |
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United Kingdom | 10 | 67% |
Germany | 1 | 7% |
Australia | 1 | 7% |
Unknown | 3 | 20% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 10 | 67% |
Scientists | 3 | 20% |
Practitioners (doctors, other healthcare professionals) | 2 | 13% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 95 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 13 | 14% |
Researcher | 12 | 13% |
Other | 7 | 7% |
Student > Doctoral Student | 6 | 6% |
Student > Bachelor | 6 | 6% |
Other | 17 | 18% |
Unknown | 34 | 36% |
Readers by discipline | Count | As % |
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Biochemistry, Genetics and Molecular Biology | 14 | 15% |
Neuroscience | 11 | 12% |
Agricultural and Biological Sciences | 10 | 11% |
Medicine and Dentistry | 4 | 4% |
Pharmacology, Toxicology and Pharmaceutical Science | 4 | 4% |
Other | 14 | 15% |
Unknown | 38 | 40% |