Development of a smart bioreactor for mammalian adherent cell expansion for application to cell therapy
Lead Research Organisation:
University of Oxford
Department Name: Engineering Science
Abstract
Cell therapy, particularly stem cell therapy, shows great promise for curing many diseases and repairing defective tissues in the human body. The problem currently is the difficulty in acquiring sufficient numbers of cells directly from a patient or donor. There is an urgent need to find a way to produce large quantities of high quality cells for cell therapy. The proposed research project will develop a smart bioreactor based on thermoresponsive polymer coated beads for culturing and expanding (increasing in cell number) adherent cells (as most cells, except blood cells, need to attach onto a surface to grow). The temperature sensitive polymer, poly(N-isopropylacrylamide) (PNIPAAm), has been found to be able to support cell adhesion and growth at 37 degree C, but when the temperature drops below 32 degree C, the cells will detach from the polymer and can thus be collected easily. This has distinctive advantages over the conventional cell culture methods in which adherent cells are harvested by destroying the proteins responsible for cell adhesion through the action of an enzyme such as trypsin. However, this enzyme also damages other crucial proteins on cell surfaces, which can affect cell growth and function. Work has been done to graft PNIPAAm to flat surfaces successfully and cells were able to grow into a thin sheet which was used to repair heart tissue defects in the human body.This project will look at how to graft PNIPAAm onto the surfaces of different types of small beads for cell culture. PNIPAAm grafted beads have already been used in chromatography for separating biological compounds, but very limited research has been done on using them for culturing human cells. Culturing adherent cells on small beads is routinely done both in research laboratories and in industry to expand cells, but the enzymatic treatment is needed to harvest cells at the end of cell culture.The thermosensitive beads to be developed in this project will enable separation of cells from beads without the damaging enzymatic treatment. In the project, different types of beads will be grafted with PNIPAAm and tested to see whether: (1) they have any toxic effects on cells, (2) they support cell growth on them, (3) cells can detach from the beads when the temperature drops below 32 degree C, and (4) cells still retain their function after being cultured on the beads. Also, a purpose-designed and fabricated bioreactor, a vessel to accommodate cells and beads and supply necessary nutrients and oxygen to the cells will be developed. This so-named smart bioreactor will be used to generate high quality cells suitable for cell therapy.
Planned Impact
Cell therapy, particularly stem cell therapy, is a promising concept for treating conditions such as Parkinson's disease, diabetes, coronary artery disease and spinal cord injury. The UK is in a leading position in stem cell science, but engineering development is urgently needed to tackle the bottlenecks in translating the basic science into products to benefit society. The proposed project has as its main objective the development of a method to supply sufficient numbers of high quality cells for clinical use. The outcome of the project will benefit those patients who cannot have cell therapy at the moment due to the non-availability of sufficient numbers of cells. A cost-effective engineering solution to the current problem will also enable the NHS to treat more patients with cell therapy, thus delivering better care to the population. We have various links with clinical collaborators at Oxford who are working on this type of therapy. Also, since the smart bioreactor proposed here builds on existing industrial knowledge and expertise, the further product development can be relatively easily taken on by industry. We anticipate a niche business in supplying therapeutic cells to order, for particular clinical applications. Our links with industry and venture capital (e.g. Technikos) will help to promote this. The applicant will be actively involved in public engagement and outreach activities to promote biomedical engineering, in particular stem cell research and related technologies. The main efforts will be devoted to getting more young people interested in Science and Technology.
People |
ORCID iD |
Hua Ye (Principal Investigator) |
Publications
Davies BM
(2017)
Identifying the optimum source of mesenchymal stem cells for use in knee surgery.
in Journal of orthopaedic research : official publication of the Orthopaedic Research Society
Drioli, Enrico (University Of Calabria, Institute Of Membrane Technology, Rende (CS), Italy); Giorno, Lidietta (University Of Calabria, Institute Of Membrane Technology, Rende (CS), Italy University Of Calabria, Rende, Italy University Of Calabria, Rende, Italy University Of Calabria, Rende, Italy University Of Calabria, Rende, Italy)
(2011)
Comprehensive Membrane Science and Engineering
Hua Ye
(2010)
Tissue engineering and stem cell bioprocessing
Hua Ye (Co-Author)
(2011)
Thermoresponsive microcarriers for stem cell culture
Hua Ye (Co-Author)
(2010)
Bioreactor for stem cell culture using thermoresponsive microcarriers
Mouthuy P
(2013)
Fabrication of calcium phosphate fibres through electrospinning and sintering of hydroxyapatite nanoparticles
in Materials Letters
Mouthuy PA
(2016)
Layering PLGA-based electrospun membranes and cell sheets for engineering cartilage-bone transition.
in Journal of tissue engineering and regenerative medicine
Mouthuy PA
(2015)
Performances of a portable electrospinning apparatus.
in Biotechnology letters
Sambu S
(2011)
Predicting the survival rate of mouse embryonic stem cells cryopreserved in alginate beads.
in Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Wan X
(2016)
Three-dimensional perfused tumour spheroid model for anti-cancer drug screening.
in Biotechnology letters
Description | Cell therapy, particularly stem cell therapy, shows great promise for curing many diseases and repairing defective tissues in the human body. The problem currently is the difficulty in acquiring sufficient numbers of cells directly from a patient or donor. There is an urgent need to find a way to produce large quantities of high quality cells for cell therapy. The proposed research project aimed to develop a smart bioreactor based on thermoresponsive polymer coated beads for culturing and expanding (increasing in cell number) adherent cells (as most cells, except blood cells, need to attach onto a surface to grow). The temperature sensitive polymer, poly(N-isopropylacrylamide) (PNIPAAm), has been found to be able to support cell adhesion and growth at 37ºC, but when the temperature drops below 32ºC, the cells will detach from the polymer and can thus be collected easily. This has distinctive advantages over the conventional cell culture methods in which adherent cells are harvested by destroying the proteins responsible for cell adhesion through the action of an enzyme such as trypsin. However, this enzyme also damages other crucial proteins on cell surfaces, which can affect cell growth and function. Work has been done to graft PNIPAAm to flat surfaces successfully and cells were able to grow into a thin sheet which was used to repair heart tissue defects in the human body. During the project, PNIPAAm was successfully grafted onto surfaces of different types of microbeads, including Sephadex G-50, Cytodex 1 and polystyrene beads. The grafting was confirmed by beads characterisation done through FTIR, SEM and combustion analysis. Different ways of grafting were developed for different beads materials and the process was optimised so that adequate amount of polymers were grafted for optimum cell adhesion and release. Different types of cells were cultured with the beads to assess cytotoxicity, cell migration, culture under perfusion and etc. A bioreactor for cell culture based on a fluidised-bed using these thermoresponsive microbeads was developed and its hydrodynamic and fluidisation characteristics were investigated. |
Exploitation Route | The developed ways to modify microcarriers so that cells cultured on them can be removed without enzyme treatment can be used in cell therapy to provide better quality cells after ex vivo expansion. Also the bioreactor designed can be used to reduce the cost of autologous cell therapy. |
Sectors | Healthcare,Pharmaceuticals and Medical Biotechnology |
Description | The findings of the project has led to further industrial funding including £9M from CRMI to establish a Regeneerative Medicine Technology Centre in Oxford. |
First Year Of Impact | 2013 |
Sector | Healthcare,Manufacturing, including Industrial Biotechology,Pharmaceuticals and Medical Biotechnology |
Impact Types | Societal,Economic |
Description | BBSRC LOLA grant |
Amount | £2,802,660 (GBP) |
Funding ID | BB/H008608/1 |
Organisation | Biotechnology and Biological Sciences Research Council (BBSRC) |
Sector | Public |
Country | United Kingdom |
Start | 08/2010 |
End | 09/2015 |
Description | CRMI Technology Centre for Regenerative Medicine |
Amount | £7,500,000 (GBP) |
Organisation | China Regenerative Medicine International |
Sector | Academic/University |
Country | Hong Kong |
Start | 02/2015 |
End | 01/2020 |
Description | CrackIt Challenge 12: Untangle |
Amount | £11,963 (GBP) |
Organisation | National Centre for the Replacement, Refinement and Reduction of Animals in Research (NC3Rs) |
Sector | Public |
Country | United Kingdom |
Start | 12/2013 |
End | 05/2014 |
Description | Enabling technologies for stem cell therapy and tissue engineering |
Amount | £1,500,000 (GBP) |
Organisation | China Bio-Med Regeneration Technology |
Sector | Private |
Country | China |
Start | 11/2013 |
End | 11/2018 |
Description | Novel bioreactor for stem cell culture |
Amount | £64,374 (GBP) |
Organisation | University of Oxford |
Sector | Academic/University |
Country | United Kingdom |
Start | 11/2014 |
End | 10/2016 |
Description | Collaboration with Prof Mark Moloney |
Organisation | University of Oxford |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | 1. Designed and fabricated different prototypes of bioreactors for culturing adhesive cells on thermoresponsive microbeads. 2. Analysed fluid dynamics within the bioreactors to optimise the bioreactor design. 3. Carried out cell culture experiments to validate the bioreactor design and operating protocols. 4. Written up publications. |
Collaborator Contribution | Prof Mark Moloney in Chemistry Department co-supervised a DPhil student to develop new methods in grafting PNIPAAm onto polystyrene microbeads. He, as a chemist, allowed access of the student to his well-equipped chemical synthesis and characterisation laboratory and provided expert advice on polymer synthesis, grafting and characterisation. |
Impact | 1. Prof Moloney and Prof Ye received £24,000 funding from EPSRC "Bridging the Gaps" 2012-13 to facilitate international collaboration on nanocarbon-derived biomaterials application. 2. A review paper on Thermoresponsive microcarriers has been submitted to Macromolecules and it is under review. |
Start Year | 2010 |
Description | Collaboration with Prof Stephen Rimmer |
Organisation | University of Sheffield |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | As engineers, we designed the bioreactor for culturing adhesive cells on thermosresponsive microbeads and planned different synthesis approach to obtain thermoresponsive microbeads. Cell culture experiments were carried out to validate the microbeads. |
Collaborator Contribution | Prof Stephen Rimmer in University of Sheffield has allowed access of my DPhil student to his specialised polymer synthesis and characterisation laboratory. He also has extensive experience in PNIPAAm and its co-polymers as cell culture substrates and has provided critical expert opinion in synthesizing method and characterisation. |
Impact | 1. A joint review paper on thermoresponsive microcarriers was submitted to Macromolecules and is under review. |
Start Year | 2010 |