The bone marrow is a site of health and disease. In health, it produces all of the blood cells that we rely on to carry oxygen and protect us from infection. However, the stem cells that produce the blood and that reside in the marrow, the haematopoietic stem cells (HSCs), age and can tip over into disease states, such as developing leukaemia. Factors such as smoking and treatment of cancers elsewhere in the body (toxic effects of chemotherapy/radiotherapy) can accelerate ageing, and therefore, drive the transition to disease. Further, it forms a home to other cancer cells, that leave their original tumour and move, or metastasise, to the bone marrow. Once in the marrow, they can become dormant, hiding from chemotherapies and activating sometime later to form devastating bone cancers. The cues that wake cancer cells from dormancy are largely unknown. If models of the bone marrow that contain human cells and that can mimic key facets of the niche in the lab, such as blood regeneration, cancer evolution and dormancy, can be developed it would be a big help in the search for better cancer therapies. We are developing the materials and technologies required to meet this challenge. In this programme of research, we will tackle three biomedical challenges: 1) HSC regeneration. Bone marrow transplantation (more correctly HSC transplantation) is a one-donor, one-recipient therapy that can be curative for blood diseases such as leukaemia. It is limited as HSCs cannot be looked after well out of the body. Approaches to properly look after these precious cells in the lab could allow this key therapy to become a one-donor, multiple recipient treatment. Further, the ability to look after the cells in the lab would open up the potential for genetically modifying the cells to allow us to cure the cells and put them back into the patient, losing the need for patient immunosuppression. 2) Cancer evolution. As we get older, our cells collect mutations in their DNA and these mutations can be drivers of cancer. Lifestyle choices such as smoking, and side effects of treatments of other diseases can also add mutations to the cells. As blood cancers develop, the bone marrow changes its architecture to protect these diseased HSCs. Our 3D environments will allow us to better understand this marrow remodelling process and how drugs can target cancers in this more protective environment. The models will also allow us to study the potential toxicity of gene-edited HSCs to make sure they don't produce unwanted side effects or are not cancerous in themselves. 3) Dormancy. What triggers dormancy and activation from dormancy are poorly understood. By placing our 3D environments in a miniaturised format where we can connect other models that include infection and immune response, we can start to understand the factors involved in the activation of cancer cells from dormancy. Our vision is driven by materials and engineering, as the bone marrow niche is rich in structural and signalling biological materials (proteins). Therefore, we will establish three engineering challenges: (1) Cells can be controlled by the stiffness and viscous nature of materials (viscoelasticity). We will therefore develop synthetic-biological hybrid materials that can be manufactured to have reproducible physical properties and that have biological functionality. (2) We will develop these materials to interact with growth factors and bioactive metabolites, both of which are powerful controllers of cell behaviours. These materials will be used to assemble the HSC microenvironments in lab-on-chip (miniaturised) format to allow high-content drug and toxicity screening. (3) We will develop real-time systems to detect changes in cell behaviour, such as the transition from health to cancer using Raman and Brillouin microscopies. The use of animals in research provides poor predictivity. We will offer better than animal model alternatives.

The lifETIME CDT will focus on the development of non-animal technologies (NATs) for use in drug development, toxicology and regenerative medicine. The industrial life sciences sector accounts for 22% of all business R&D spend and generates £64B turnover within the UK with growth expected at 10% pa over the next decade. Analysis from multiple sources [1,2] have highlighted the limitations imposed on the sector by skills shortages, particularly in the engineering and physical sciences area. Our success in attracting pay-in partners to invest in training of the skills to deliver next-generation drug development, toxicology and regenerative medicine (advanced therapeutic medicine product, ATMP) solutions in the form of NATs demonstrates UK need in this growth area. The CDT is timely as it is not just the science that needs to be developed, but the whole NAT ecosystem - science, manufacture, regulation, policy and communication. Thus, the CDT model of producing a connected community of skilled field leaders is required to facilitate UK economic growth in the sector. Our stakeholder partners and industry club have agreed to help us deliver the training needed to achieve our goals. Their willingness, again, demonstrates the need for our graduates in the sector. This CDT's training will address all aspects of priority area 7 - 'Engineering for the Bioeconomy'. Specifically, we will: (1) Deliver training that is developed in collaboration with and is relevant to industry. - We align to the needs of the sector by working with our industrial partners from the biomaterials, cell manufacture, contract research organisation and Pharma sectors. (2) Facilitate multidisciplinary engineering and physical sciences training to enable students to exploit the emerging opportunities. - We build in multidisciplinarity through our supervisor pool who have backgrounds ranging from bioengineering, cell engineering, on-chip technology, physics, electronic engineering, -omic technologies, life sciences, clinical sciences, regenerative medicine and manufacturing; the cohort community will share this multidisciplinarity. Each student will have a physical science, a biomedical science and a stakeholder supervisor, again reinforcing multidisciplinarity. (3) Address key challenges associated with medicines manufacturing. - We will address medicines manufacturing challenges through stakeholder involvement from Pharma and CROs active in drug screening including Astra Zeneca, Charles River Laboratories, Cyprotex, LGC, Nissan Chemical, Reprocell, Sygnature Discovery and Tianjin. (4) Embed creative approaches to product scale-up and process development. - We will embed these approaches through close working with partners including the Centre for Process Innovation, the Cell and Gene Therapy Catapult and industrial partners delivering NATs to the marketplace e.g. Cytochroma, InSphero and OxSyBio. (5) Ensure students develop an understanding of responsible research and innovation (RRI), data issues, health economics, regulatory issues, and user-engagement strategies. - To ensure students develop an understanding of RRI, data issues, economics, regulatory issues and user-engagement strategies we have developed our professional skills training with the Entrepreneur Business School to deliver economics and entrepreneurship, use of TERRAIN for RRI, links to NC3Rs, SNBTS and MHRA to help with regulation training and involvement of the stakeholder partners as a whole to help with user-engagement. The statistics produced by Pharma, UKRI and industry, along with our stakeholder willingness to engage with the CDT provides ample proof of need in the sector for highly skilled graduates. Our training has been tailored to deliver these graduates and build an inclusive, cohesive community with well-developed science, professional and RRI skills. [1] https://goo.gl/qNMTTD [2] https://goo.gl/J9u9eQ