Poly(3-hydroxyoctanoate), a promising new material for cardiac tissue engineering

Bagdadi, A., Safari, M., Dubey, P., Basnett, P., Sofokleous P., Humphrey E, Locke, I.C., Edirisinghe M., Terracciano C., Boccaccini, A.R., Knowles, J.C., Harding, S. and Roy, I. 2018. Poly(3-hydroxyoctanoate), a promising new material for cardiac tissue engineering. Journal of Tissue Engineering and Regenerative Medicine. 12 (1), pp. E495-E512.

TitlePoly(3-hydroxyoctanoate), a promising new material for cardiac tissue engineering
AuthorsBagdadi, A., Safari, M., Dubey, P., Basnett, P., Sofokleous P., Humphrey E, Locke, I.C., Edirisinghe M., Terracciano C., Boccaccini, A.R., Knowles, J.C., Harding, S. and Roy, I.
Abstract

Cardiac tissue engineering (CTE) is currently a prime focus of research due to an enormous clinical need. In this work, a novel functional material, Poly(3-hydroxyoctanoate), P(3HO), a medium chain length polyhydroxyalkanoate (PHA), produced using bacterial fermentation, was studied as a new potential material for CTE. Engineered constructs with improved mechanical properties, crucial for supporting the organ during new tissue regeneration, and enhanced surface topography, to allow efficient cell adhesion and proliferation, were fabricated. Our results showed that the mechanical properties of the final patches were close to that of cardiac muscle. Biocompatibility of the P(3HO) neat patches, assessed using Neonatal ventricular rat myocytes (NVRM), showed that the polymer was as good as collagen in terms of cell viability, proliferation and adhesion. Enhanced cell adhesion and proliferation properties were observed when porous and fibrous structures were incorporated to the patches. Also, no deleterious effect was observed on the adults cardiomyocytes’ contraction when cardiomyocytes were seeded on the P(3HO) patches. Hence, P(3HO) based multifunctional cardiac patches are promising constructs for efficient CTE. This work will provide a positive impact on the development of P(3HO) and other PHAs as a novel new family of biodegradable functional materials with huge potential in a range of different biomedical applications, particularly CTE, leading to further interest and exploitation of these materials.

KeywordsCardiac Tissue Engineering
Polyhydroxyalkanoate
Poly(3-hydroxyoctanoate)
Cardiac patches
JournalJournal of Tissue Engineering and Regenerative Medicine
Journal citation12 (1), pp. E495-E512
ISSN1932-6254
Year2018
PublisherWiley
Accepted author manuscriptJTERM 290616 edited final version with new mage FINAL for uploading on the VRE 06102016.pdf
Digital Object Identifier (DOI)doi:10.1002/term.2318
Publication dates
Published30 Sep 2016
Published online30 Sep 2016
Published in printJan 2018

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Thomson, N., Roy, I., Summers, D. and Sivaniah, E. 2010. In vitro production of polyhydroxyalkanoates: achievements and applications. Journal of Chemical Technology and Biotechnology. 85 (6), pp. 760-767.

Fabrication of a novel poly(3-hydroxyoctanoate) / nanoscale bioactive glass composite film with potential as a multifunctional wound dressing
Rai, R., Boccaccini, A.R., Knowles, J.C., Locke, I.C., Gordge, M.P., McCormick, A., Salih, V., Mordon, N., Keshavarz, T. and Roy, I. 2010. Fabrication of a novel poly(3-hydroxyoctanoate) / nanoscale bioactive glass composite film with potential as a multifunctional wound dressing. 5th international conference on times of polymers (TOP) and composites. Ischia, Italy 20–23 June 2010

Polyhydroxyalkanoates: bioplastics with a green agenda
Keshavarz, T. and Roy, I. 2010. Polyhydroxyalkanoates: bioplastics with a green agenda. Current Opinion in Microbiology. 13 (3), pp. 321-326.

Production of polyhydroxyalkanoates: the future green materials of choice
Akaraonye, E., Keshavarz, T. and Roy, I. 2010. Production of polyhydroxyalkanoates: the future green materials of choice. Journal of Chemical Technology and Biotechnology. 85 (6), pp. 732-743.

Poly(3-hydroxybutyrate) multifunctional composite scaffolds for tissue engineering applications
Misra, S.K., Ansari, T.I., Valappil, S.P., Mohn, D., Philip, S.E., Stark, W.J., Roy, I., Knowles, J.C., Salih, V. and Boccaccini, A.R. 2010. Poly(3-hydroxybutyrate) multifunctional composite scaffolds for tissue engineering applications. Biomaterials. 31 (10), pp. 2806-2815.

Characterization of carbon nanotube (MWCNT) containing P(3HB)/bioactive glass composites for tissue engineering applications
Misra, S.K., Ohashi, F., Valappil, S.P., Knowles, J.C., Roy, I., Ravi, S., Silva, P., Salih, V. and Boccaccini, A.R. 2010. Characterization of carbon nanotube (MWCNT) containing P(3HB)/bioactive glass composites for tissue engineering applications. Acta Biomaterialia. 6 (3), pp. 735-742.

Effect of nanoparticulate bioactive glass particles on bioactivity and cytocompatibility of poly(3-hydroxybutyrate) composites
Misra, S.K., Ansari, T.I., Mohn, D., Valappil, S.P., Brunner, T.J., Stark, W.J., Roy, I., Knowles, J.C., Sibbons, P.D., Valsami-Jones, E., Boccaccini, A.R. and Salih, V. 2010. Effect of nanoparticulate bioactive glass particles on bioactivity and cytocompatibility of poly(3-hydroxybutyrate) composites. Journal of the Royal Society Interface. 7 (44), pp. 453-465.

Mechanisms of Urocortin family peptide mediated chondroprotection
White, O.B., Intekhab Alam, N.Y., Chowdrey, H.S., Knight, R.A. and Locke, I.C. 2010. Mechanisms of Urocortin family peptide mediated chondroprotection. OARSI 2010 World Congress on Osteoarthritis. Brussels, Belgium September 23-26, 2010

Polyhydroxyalkanoates, the emerging new green polymers of choice
Rai, R. and Roy, I. 2010. Polyhydroxyalkanoates, the emerging new green polymers of choice. in: Biodegradable polymers and green chemistry Royal Society of Chemistry. pp. 79-97

The effect of indentor shape on the creep curves of collagen gel
Locke, I.C., White, O.B., Trwoga, P. and Afoke, A. 2010. The effect of indentor shape on the creep curves of collagen gel. OARSI 2010 World Congress on Osteoarthritis. Brussels, Belgium September 23-26, 2010

α-MSH and dTRP8-γ-MSH inhibit TNF-α induced MMP 1 and 13 expression in human C20/A4 chondrocytes
Kaneva, M., Locke, I.C., Kerrigan, M.J.P. and Getting, S.J. 2010. α-MSH and dTRP8-γ-MSH inhibit TNF-α induced MMP 1 and 13 expression in human C20/A4 chondrocytes. British Pharmacological Society Winter Meeting 2010. London, UK 14th-16th December 2010

Melanocortin peptides modulate pro-inflammatory mediator release from TNF-a stimulated C-20/A4 cells
Kaneva, M., Kerrigan, M.J.P., Locke, I.C. and Getting, S.J. 2010. Melanocortin peptides modulate pro-inflammatory mediator release from TNF-a stimulated C-20/A4 cells. British Orthopaedic Research Society Annual Meeting. Newcastle upon Tyne 22 - 23 Jun 2009 Wiley. pp. PO136

The MC3 agonist dTRP8-γ-MSH inhibits IL-6 and IL-8 release from TNF-α stimulated C-20/A4 chondrocytes, an effect blocked by the MC3R antagonist SHU9119
Kaneva, M., Kerrigan, M.J.P., Locke, I.C. and Getting, S.J. 2010. The MC3 agonist dTRP8-γ-MSH inhibits IL-6 and IL-8 release from TNF-α stimulated C-20/A4 chondrocytes, an effect blocked by the MC3R antagonist SHU9119. Physiology 2010. University of Manchester 30 June - 2 July 2010

Microbial production of biodegradable polymers and their role in cardiac stent development
Basnett, P. and Roy, I. 2010. Microbial production of biodegradable polymers and their role in cardiac stent development. in: Mendez-Vilas, A. (ed.) Current research, technology and education topics in applied microbiology and microbial biotechnology Formatex Research Center.

Biodegradable polymers and their role in coronary stent development
Basnett, P. and Roy, I. 2010. Biodegradable polymers and their role in coronary stent development. in: Current research in technology and education topics in applied microbiology and microbial biotechnology Formatex Research Center.

Electrospun nanofibrous biodegradable polyester coatings on Bioglass®-based glass-ceramics for tissue engineering
Bretcanu, O., Misra, S.K., Yunos, D.M., Boccaccini, A.R., Roy, I., Kowalczyk, T., Blonski, S. and Kowalewski, T.A. 2009. Electrospun nanofibrous biodegradable polyester coatings on Bioglass®-based glass-ceramics for tissue engineering. Materials Chemistry and Physics. 118 (2-3), pp. 420-426.

Melanocortin peptide therapy for the treatment of arthritic pathologies
Getting, S.J., Kaneva, M., Bhadresa, Y., Renshaw, D., Leoni, G., Patel, H.B., Kerrigan, M.J.P. and Locke, I.C. 2009. Melanocortin peptide therapy for the treatment of arthritic pathologies. The Scientific World Journal. 9, pp. 1394-1414.

Quantitative PCR study on the mode of action of oligosaccharide elicitors on penicillin G production by Penicillium chrysogenum
Nair, R.R., Roy, I., Bucke, C. and Keshavarz, T. 2009. Quantitative PCR study on the mode of action of oligosaccharide elicitors on penicillin G production by Penicillium chrysogenum. Journal of Applied Microbiology. 107 (4), pp. 1131-1139.

Pro-inflammatory mediator release from TNF-α stimulated C-20/A4 cells results in Col II degradation
Kaneva, M., Kerrigan, M.J.P., Locke, I.C. and Getting, S.J. 2009. Pro-inflammatory mediator release from TNF-α stimulated C-20/A4 cells results in Col II degradation. British Orthopaedic Research Society (BORS) Annual Meeting. Newcastle 22nd - 23rd June 2009

Effect of impeller speed and pH on the production of Poly(3-hydroxybutyrate) using Bacillus cereus SPV
Philip, S.E., Sengupta, S., Keshavarz, T. and Roy, I. 2009. Effect of impeller speed and pH on the production of Poly(3-hydroxybutyrate) using Bacillus cereus SPV. Biomacromolecules. 10 (4), pp. 691-699.

Incorporation of vitamin E in poly(3hydroxybutyrate)/Bioglass composite films: effect on surface properties and cell attachment
Misra, S.K., Philip, S.E., Chrzanowski, W., Nazhat, S.N., Roy, I., Knowles, J.C., Salih, V. and Boccaccini, A.R. 2009. Incorporation of vitamin E in poly(3hydroxybutyrate)/Bioglass composite films: effect on surface properties and cell attachment. Journal of the Royal Society Interface. 6 (33), pp. 401-409.

In vitro biocompatibility of 45S5 Bioglass®-derived glass-ceramic scaffolds coated with poly(3-hydroxybutyrate)
Bretcanu, O., Misra, S.K., Roy, I., Renghini, C., Fiori, F., Boccaccini, A.R. and Salih, V. 2009. In vitro biocompatibility of 45S5 Bioglass®-derived glass-ceramic scaffolds coated with poly(3-hydroxybutyrate). Journal of Tissue Engineering and Regenerative Medicine. 3 (2), pp. 139-148.

Polyhydroxyalkanoate synthases-enzymes involved in biodegradable polymer synthesis
Roy, I., Philip, S.E. and Keshavarz, T. 2009. Polyhydroxyalkanoate synthases-enzymes involved in biodegradable polymer synthesis. COST Action 868: Biotechnical Functionalisation of Renewable Polymeric Materials : Meeting on "Biotechnology and Biopolymers in Textile, Packaging, Cosmetics and Medical Applications". Istanbul, Turkey 19 - 20 Feb 2009

Microbial PHA biosynthesis and its biomedical applications
Roy, I., Philip, S.E., Francis, L., Rai, R., Keshavarz, T., Misra, S.K., Decheng, M. and Boccaccini, A.R. 2009. Microbial PHA biosynthesis and its biomedical applications. in: Proceedings of Euromat 2009, Glasgow, 7 - 10 September 2009 Euromat.

A class IV PHA synthase from Bacillus cereus SPV
Philip, S.E. and Roy, I. 2009. A class IV PHA synthase from Bacillus cereus SPV. in: Kiekens, P., Nierstrasz, V. and Lenting, H.B.M. (ed.) Proceedings of the international conference on textile and polymer biotechnology 6th Het Pand, Ghent, Belgium 23-25 September 2009 Ghent University. Department of Textiles Ghent.

Melanocortin peptides modulate pro-inflammatory mediator release from TNF-a stimulated C-20/A4 cells
Kaneva, M., Kerrigan, M.J.P., Locke, I.C. and Getting, S.J. 2009. Melanocortin peptides modulate pro-inflammatory mediator release from TNF-a stimulated C-20/A4 cells. pA2 Online. From the Queen Elizabeth II Conference Centre London, Winter 2009 Meeting: Proceedings of the British Pharmacological Society.

P(3HB) production by Bacillus cereus SPV using sucrose as a carbon source
Akaraonye, E., Keshavarz, T. and Roy, I. 2009. P(3HB) production by Bacillus cereus SPV using sucrose as a carbon source. in: Kiekens, P., Nierstrasz, V. and Lenting, H.B.M. (ed.) Proceedings of the international conference on textile and polymer biotechnology 6th Het Pand, Ghent, Belgium 23-25 September 2009 Ghent University. Department of Textiles Ghent.

Elicitation effects of oligosaccharides on the transcriptional level of bacitracin ABC transporter genes in Bacillus licheniformis
Murphy, T., Roy, I., Harrop, A., Dixon, K. and Keshavarz, T. 2008. Elicitation effects of oligosaccharides on the transcriptional level of bacitracin ABC transporter genes in Bacillus licheniformis. Biotechnology Letters. 30 (9), pp. 1665-1670.

Polyhydroxyalkanoate biosynthesis in Bacillus cereus SPV under varied limiting conditions and an insight into the biosynthetic genes involved
Valappil, S.P., Rai, R., Bucke, C. and Roy, I. 2008. Polyhydroxyalkanoate biosynthesis in Bacillus cereus SPV under varied limiting conditions and an insight into the biosynthetic genes involved. Journal of Applied Microbiology. 104 (6), pp. 1624-1635.

Comparison of nanoscale and microscale bioactive glass on the properties of P(3HB)/Bioglass® composites
Misra, S.K., Mohn, D., Brunner, T.J., Stark, W.J., Philip, S.E., Roy, I., Salih, V., Knowles, J.C. and Boccaccini, A.R. 2008. Comparison of nanoscale and microscale bioactive glass on the properties of P(3HB)/Bioglass® composites. Biomaterials. 29 (12), pp. 1750-1761.

Comparison of nanoscale and microscale bioactive glass on the properties of P(3HB)/Bioglass composites
Misra, S.K., Mohn, D., Brunner, T.J., Stark, W.J., Philip, S.E., Roy, I., Salih, V., Knowles, J.C. and Boccaccini, A.R. 2008. Comparison of nanoscale and microscale bioactive glass on the properties of P(3HB)/Bioglass composites. Biomaterials. 29 (12), pp. 1750-1761.

Metabolite profiles of interacting mycelial fronts differ for pairings of the wood decay basidiomycete fungus, Stereum hirsutum with its competitors Coprinus micaceus and Coprinus disseminatus
Peiris, D., Dunn, W.B., Brown, M., Kell, D.B., Roy, I. and Hedger, J.N. 2008. Metabolite profiles of interacting mycelial fronts differ for pairings of the wood decay basidiomycete fungus, Stereum hirsutum with its competitors Coprinus micaceus and Coprinus disseminatus. Metabolomics. 4 (1), pp. 52-62.

Optimisation of β-glucuronidase production from a newly isolated Ganoderma applanatum
Chouiter, R., Roy, I. and Bucke, C. 2008. Optimisation of β-glucuronidase production from a newly isolated Ganoderma applanatum. Journal of Molecular Catalysis B: Enzymatic. 50 (2-4), pp. 114-120.

Microbial biosynthesis of PHAs and its applications
Roy, I., Philip, S.E., Francis, L., Rai, R., Valappil, S.P., Markiv, A., Keshavarz, T., Misra, S.K., Decheng, M. and Boccaccini, A.R. 2008. Microbial biosynthesis of PHAs and its applications. COST Action 868: Biotechnical Functionalisation of Renewable Polymeric Materials: 2008 Annual Workshop (combined Working Group and Management Committee meeting). Varna, Bulgaria 18 -19 Sep 2008

Microbial PHA biosynthesis and its applications
Roy, I., Philip, S.E., Francis, L., Rai, R., Valappil, S.P., Markiv, A., Keshavarz, T., Misra, S.K., Decheng, M. and Boccaccini, A.R. 2008. Microbial PHA biosynthesis and its applications. 11th International Symposium on Biodegradable Polyesters. Massey University in Auckland, New Zealand 23 - 26 Nov 2008

Polyhydroxyalkanoates: a new generation of biotechnologically produced biodegradable polymers
Roy, I. and Philip, S.E. 2008. Polyhydroxyalkanoates: a new generation of biotechnologically produced biodegradable polymers. in: Richter, F.W. (ed.) Biotechnology: research, technology and applications New York Nova Science Publishers. pp. 1-48

Fabrication of a novel
Roy, I. and Philip, S.E. 2008. Fabrication of a novel. in: Richter, F.W. (ed.) Biotechnology: research, technology and applications New York Nova Science Publishers. pp. 1-48

Production of medium chain length polyhydroxyalkanoates using Pseudomonas species
Rai, R., Keshavarz, T. and Roy, I. 2008. Production of medium chain length polyhydroxyalkanoates using Pseudomonas species. 11th International Symposium on Biodegradable Polyesters. Massey University in Auckland, New Zealand 23 - 26 Nov 2008

Polyhydroxyalkanoate synthase in Bacillus cereus SPV, a class IV PHA synthase
Philip, S.E., Odell, M., Keshavarz, T. and Roy, I. 2008. Polyhydroxyalkanoate synthase in Bacillus cereus SPV, a class IV PHA synthase. 11th International Symposium on Biodegradable Polyesters. Massey University in Auckland, New Zealand 23 - 26 Nov 2008

Optimisation studies of multiple elicitor addition in microbial systems: P.Chrysogenum and B.Lichiniformis
Nair, R.R., Murphy, T., Roy, I., Harrop, A., Dixon, K. and Keshavarz, T. 2008. Optimisation studies of multiple elicitor addition in microbial systems: P.Chrysogenum and B.Lichiniformis. in: Marino, G., Bardone, E. and Viglia, A. (ed.) IBIC2008 - 1st International Conference on Industrial Biotechnology AIDIC Servizi S.r.l..

Polyhydroxyalkanoate synthasis using Bacillus cereus SPV
Francis, L., Keshavarz, T. and Roy, I. 2008. Polyhydroxyalkanoate synthasis using Bacillus cereus SPV. COST Action 868: Biotechnical Functionalisation of Renewable Polymeric Materials: 2008 Annual Workshop (combined Working Group and Management Committee meeting). Varna, Bulgaria 18 -19 Sep 2008

Large-scale production and efficient recovery of PHB with desirable material properties, from the newly characterised Bacillus cereus SPV
Valappil, S.P., Misra, S.K., Boccaccini, A.R., Keshavarz, T., Bucke, C. and Roy, I. 2007. Large-scale production and efficient recovery of PHB with desirable material properties, from the newly characterised Bacillus cereus SPV. Journal of Biotechnology. 132 (3), pp. 251-258.

Biodegradable polymer coated 45S5 Bioglassderived glass-ceramic scaffolds for bone tissue engineering
Bretcanu, O., Chen, Q., Misra, S.K., Boccaccini, A.R., Roy, I., Verne, E. and Brovarone, C.V. 2007. Biodegradable polymer coated 45S5 Bioglassderived glass-ceramic scaffolds for bone tissue engineering. European Journal of Glass Science and Technology Part A. 48 (5), pp. 227-234.

Effect of oligosaccharide elicitors on bacitracin A production and evidence of transcriptional level control
Keshavarz, T., Murphy, T., Roy, I., Harrop, A. and Dixon, K. 2007. Effect of oligosaccharide elicitors on bacitracin A production and evidence of transcriptional level control. Journal of Biotechnology. 131 (4), pp. 397-403.

Fabrication and characterization of biodegradable poly(3-hydroxybutyrate) composite containing Bioglass
Misra, S.K., Nazhat, S.N., Valappil, S.P., Moshrefi-Torbati, M., Wood, R.J.K., Roy, I. and Boccaccini, A.R. 2007. Fabrication and characterization of biodegradable poly(3-hydroxybutyrate) composite containing Bioglass. Biomacromolecules. 8 (7), pp. 2112-2119.

The corticotrophin-releasing factor-like peptide urocortin reverses key deficits in two rodent models of Parkinson's disease
Abuirmeileh, A., Lever, R., Kingsbury, A.E., Lees, A.J., Locke, I.C., Knight, R.A., Chowdrey, H.S., Biggs, C.S. and Whitton, P.S. 2007. The corticotrophin-releasing factor-like peptide urocortin reverses key deficits in two rodent models of Parkinson's disease. European Journal of Neuroscience. 26 (2), pp. 417-423.

Novel application of oligosaccharides as elicitors for the enhancement of bacitracin A production in cultures of Bacillus licheniformis
Murphy, T., Parra, R., Radman, R., Roy, I., Harrop, A., Dixon, K. and Keshavarz, T. 2007. Novel application of oligosaccharides as elicitors for the enhancement of bacitracin A production in cultures of Bacillus licheniformis. Enzyme and Microbial Technology. 40 (6), pp. 1518-1523.

Polyhydroxyalkanoates: biodegradable polymers with a range of applications
Philip, S.E., Keshavarz, T. and Roy, I. 2007. Polyhydroxyalkanoates: biodegradable polymers with a range of applications. Journal of Chemical Technology and Biotechnology. 82 (3), pp. 233-247.

Polyhydroxyalkanoates: biodegradable polymers with a range of applications
Philip, S.E., Keshavarz, T. and Roy, I. 2007. Polyhydroxyalkanoates: biodegradable polymers with a range of applications. Journal of Chemical Technology and Biotechnology. 82 (3), pp. 233-247.

Interactions between cell surface protein disulphide isomerase and S-nitrosoglutathione during nitric oxide delivery
Shah, C.M., Bell, S.E., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2007. Interactions between cell surface protein disulphide isomerase and S-nitrosoglutathione during nitric oxide delivery. Nitric Oxide. 16 (1), pp. 135-142.

Poly(3- hydroxybutyrate)/Bioglass® composite films containing carbon nanotubes
Misra, S.K., Watts, P.C.P., Valappil, S.P., Silva, S.R.P., Boccaccini, A.R. and Roy, I. 2007. Poly(3- hydroxybutyrate)/Bioglass® composite films containing carbon nanotubes. Nanotechnology. 18 (7), p. 075701.

PHA biosynthesis in Bacillus cereus SPV and its applications
Roy, I., Valappil, S.P., Misra, S.K. and Boccaccini, A.R. 2007. PHA biosynthesis in Bacillus cereus SPV and its applications. COST Action 868: Biotechnical Functionalisation of Renewable Polymeric Materials: first annual workshop. Graz, Austria 12 - 14 Sep 2007

PHA Biosynthesis in Bacillus cereus SPV
Roy, I., Philip, S.E., Rai, R. and Valappil, S.P. 2007. PHA Biosynthesis in Bacillus cereus SPV. International Conference on Biodegradable Polymers: their production, characterisation and application. SCI, London 10 Dec 2007

Production of Polyhydroxyalkanoates from Bacillus cereus SPV under different nutrient limiting conditions
Rai, R., Padinhara, S.V., Keshavarz, T. and Roy, I. 2007. Production of Polyhydroxyalkanoates from Bacillus cereus SPV under different nutrient limiting conditions. COST Action 868: Biotechnical Functionalisation of Renewable Polymeric Materials: first annual workshop. Graz, Austria 12 - 14 Sep 2007

Production of medium chain length polyhydroxyalkanoates using pseudomonas species UOW0417398
Rai, R., Keshavarz, T. and Roy, I. 2007. Production of medium chain length polyhydroxyalkanoates using pseudomonas species UOW0417398. International Conference on Biodegradable Polymers: their production, characterisation and application. SCI, London 10 Dec 2007

Polyhydroxy-alkanoates - the biodegradable polymers
Philip, S.E., Odell, M., Keshavarz, T. and Roy, I. 2007. Polyhydroxy-alkanoates - the biodegradable polymers. International Conference on Biodegradable Polymers: their production, characterisation and application. SCI, London 10 Dec 2007

Biosynthesis of polyhydroxyalkanoates and their applications
Francis, L., Keshavarz, T. and Roy, I. 2007. Biosynthesis of polyhydroxyalkanoates and their applications. International Conference on Biodegradable Polymers: their production, characterisation and application. SCI, London 10 Dec 2007

Polyhydroxyalkanoate (PHA) biosynthesis from structurally unrelated carbon sources by a newly characterized Bacillus spp
Valappil, S.P., Peiris, D., Langley, G.J., Herniman, J.M., Boccaccini, A.R., Bucke, C. and Roy, I. 2007. Polyhydroxyalkanoate (PHA) biosynthesis from structurally unrelated carbon sources by a newly characterized Bacillus spp. Journal of Biotechnology. 127 (3), pp. 475-487.

Polyhydroxyalkanoates in Gram-positive bacteria: insights from the genera Bacillus and Streptomyces
Valappil, S.P., Boccaccini, A.R., Bucke, C. and Roy, I. 2007. Polyhydroxyalkanoates in Gram-positive bacteria: insights from the genera Bacillus and Streptomyces. Antonie van Leeuwenhoek. 91 (1), pp. 1-17.

Biomedical applications of polyhydroxyalkanoates: an overview of animal testing and in vivo responses
Valappil, S.P., Misra, S.K., Boccaccini, A.R. and Roy, I. 2006. Biomedical applications of polyhydroxyalkanoates: an overview of animal testing and in vivo responses. Expert Review of Medical Devices. 3 (6), pp. 853-868.

Cytotoxicity of clove (Syzygium aromaticum) oil and its major components to human skin cells
Prashar, A., Locke, I.C. and Evans, C.S. 2006. Cytotoxicity of clove (Syzygium aromaticum) oil and its major components to human skin cells. Cell Proliferation. 39 (4), pp. 241-248.

Nanoindentation testing of biodegradabale polymers
Wood, R.J.K., Dan, S., Moshrefi-Torbati, M., Misra, S.K., Valappil, S.P., Boccaccini, A.R. and Roy, I. 2006. Nanoindentation testing of biodegradabale polymers. Proceedings of CAMTEC Workshop. University of Cambridge, Cambridge, UK 11 Apr 2006

PHA biosynthesis in Bacillus cereus SPV and its applications
Roy, I., Valappil, S.P., Misra, S.K. and Boccaccini, A.R. 2006. PHA biosynthesis in Bacillus cereus SPV and its applications. Proceedings of the International Symposium on Biological Polyesters. Minneapolis, USA 27 - 31 Aug 2006

Polyhydroxyalkanoate (PHA)/inorganic phase composites for tissue engineering applications
Misra, S.K., Valappil, S.P., Roy, I. and Boccaccini, A.R. 2006. Polyhydroxyalkanoate (PHA)/inorganic phase composites for tissue engineering applications. Biomacromolecules. 7 (8), pp. 2250-2257.

Development of polyhydroxyalkanoates/Bioglass® composite tissue scaffolds for tissue engineering applications
Misra, S.K., Valappil, S.P., Nazhat, S.N., Moshrefi-Torbati, M., Roy, I. and Boccaccini, A.R. 2006. Development of polyhydroxyalkanoates/Bioglass® composite tissue scaffolds for tissue engineering applications. Proceedings of the 20th European Conference on Biomaterials, European Society of Biomaterials. Nantes, FRANCE 27 Sep - 01 Oct 2006

From bacteria to tissue engineering applications-usage of polyhydroxyalkanoates for biomedical applications
Misra, S.K., Nazhat, S.N., Torbati, M.M., Silva, S.R.P., Roy, I. and Boccaccini, A.R. 2006. From bacteria to tissue engineering applications-usage of polyhydroxyalkanoates for biomedical applications. Proceedings of the International Conference on the Design of Biomaterials. Kanpur, India 08 - 11 Dec 2006

Biological activity of industrial wood and bark waste from Pinus nigra
Curras Lino, M., Radman, R., Bertaud, F., Nisula, L., Lenon, G., Holbom, B., Locke, I.C., Thompson, S. and Keshavarz, T. 2006. Biological activity of industrial wood and bark waste from Pinus nigra. in: Actual problems of creation of new medicinal preparations of natural origin: the 10th international congress PHYTOPHARM 2006, St.-Petersburg, June 27-30, 2006: proceedings of congress St Petersburg, Russia PHYTOPHARM. pp. 401-403

Polyhydroxyalkanoate synthases: the enzymes involved in biodegradable polymer synthesis
Valappil, S.P., Philip, S.E., Odell, M., Keshavarz, T. and Roy, I. 2005. Polyhydroxyalkanoate synthases: the enzymes involved in biodegradable polymer synthesis. Proceedings of Frontiers in Chemical Biology: Mechanistic Enzymology and Biocatalysis. Exeter, UK 31 Aug - 02 Sep 2005

Effect of recovery process on the physical and mechanical properties of Polyhydroxybutyrate (PHB) extracted from a newly isolated Bacillus sp.
Valappil, S.P., Misra, S.K., Boccaccini, A.R. and Bucke, C. 2005. Effect of recovery process on the physical and mechanical properties of Polyhydroxybutyrate (PHB) extracted from a newly isolated Bacillus sp. Proceedings of the UKSB annual meeting, Nottingham, UK. Nottingham, UK 2005

Large scale production of P(3HB) from newly isolated Bacillus sp.
Valappil, S.P., Keshavarz, T., Bucke, C. and Roy, I. 2005. Large scale production of P(3HB) from newly isolated Bacillus sp. Proceedings of the 1st International Conference on Environmental Industrial and Applied Microbiology. Badajoz, Spain 15 - 18 Mar 2005

Effect of various carbon sources on the production of PHAs from the newly isolated Bacillus sp.
Valappil, S.P., Bucke, C. and Roy, I. 2005. Effect of various carbon sources on the production of PHAs from the newly isolated Bacillus sp. Proceedings of the International Union of Microbiological Societies Congress, IUMS. San Fransisco, USA 23 - 28 Jul 2005

Interactions between cell surface protein disulphide isomerase and S-nitrosoglutathione during nitric oxide delivery into MEG-01 megakaryocytes
Shah, C.M., Walters, S.E., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2005. Interactions between cell surface protein disulphide isomerase and S-nitrosoglutathione during nitric oxide delivery into MEG-01 megakaryocytes. Ireland-UK Platelet Conference 2005. Dublin, Ireland 04-06 Sep 2005

Towards unravelling the elicitation mechanism in cultures of Penicillium chrysogenin: Chrysogenin elicitation
Nair, R.R., Radman, R., Roy, I., Bucke, C. and Keshavarz, T. 2005. Towards unravelling the elicitation mechanism in cultures of Penicillium chrysogenin: Chrysogenin elicitation. in: Pierucci, S. (ed.) 7th Italian Conference on Chemical and Process Engineering: ICheaP 7, May 15-16, 2005, Giardini Di Naxos, Italy Italy Associazione Italiana Di Ingegneria Chimica.

Natural biodegradable polymers from the Polyhydroxyalkanoate family emerging as a promising material for biomedical applications
Misra, S.K., Boccaccini, A.R., Valappil, S.P. and Roy, I. 2005. Natural biodegradable polymers from the Polyhydroxyalkanoate family emerging as a promising material for biomedical applications. Proceedings of 'a Forecast of the Future for Biomaterials' Professor Larry L. Hench Retirement Symposium. London, UK 29 - 30 Sep 2005

The metabolic role of methymalonyl CoA mutase in Escherichia coli
Kannan, S.M., Dwek, M., Bucke, C. and Roy, I. 2005. The metabolic role of methymalonyl CoA mutase in Escherichia coli. Proceedings of Viteomics: structure and function of vitamins and cofactors. Cambridge, UK 2005

Polysaccharides and polysaccharide-modifying enzymes in Ganoderma species
Chouiter, R., Roy, I. and Bucke, C. 2005. Polysaccharides and polysaccharide-modifying enzymes in Ganoderma species. Proceedings of the 13th European Carbohydrate Symposium. Bratislava, Slovakia 21 - 26 Aug 2005

Polysaccharide-modifying enzymes from Ganoderma species and their applications
Chouiter, R., Roy, I. and Bucke, C. 2005. Polysaccharide-modifying enzymes from Ganoderma species and their applications. Proceedings of the 1st International Conference on Environmental Industrial and Applied Microbiology. Badajoz, Spain 15 - 18 Mar 2005

Phylogenetic relationships between Basidiomycetes believed to be Ganoderma species based on distance analysis of their 5.8S, ITS1 and ITS2 rDNA sequences
Chouiter, R., Roy, I. and Bucke, C. 2005. Phylogenetic relationships between Basidiomycetes believed to be Ganoderma species based on distance analysis of their 5.8S, ITS1 and ITS2 rDNA sequences. Proceedings of the 1st International Conference on Environmental Industrial and Applied Microbiology. Badajoz, Spain 15 - 18 Mar 2005

Evidence for a neuroprotective role of the CRH-like peptide, urocortin, in the 6-hydroxydopamine treated rat
Biggs, C.S., Locke, I.C., Knight, R.A., Chowdrey, H.S. and Whitton, P.S. 2005. Evidence for a neuroprotective role of the CRH-like peptide, urocortin, in the 6-hydroxydopamine treated rat. 18th National Meeting of the British Neuroscience Association. Brighton, UK 03-06 Apr 2005

Urocortin attenuates key indicators of nigrostriatal pathway destruction in a rat hemiparkinsonian model
Biggs, C.S., Abuirmeileh, A., Locke, I.C., Knight, R.A., Chowdrey, H.S. and Whitton, P.S. 2005. Urocortin attenuates key indicators of nigrostriatal pathway destruction in a rat hemiparkinsonian model. Proceedings of the British Pharmacological Society. 3 (4).

Functional characteristics of the streptococcal deoxyribonuclease 'streptodornase', a protein with DNase activity present in the medicament Varidase
Locke, I.C. and Carpenter, B.G. 2004. Functional characteristics of the streptococcal deoxyribonuclease 'streptodornase', a protein with DNase activity present in the medicament Varidase. Enzyme and Microbial Technology. 35 (1), pp. 67-73.

Cytotoxicity of lavender oil and its major components to human skin cells
Prashar, A., Locke, I.C. and Evans, C.S. 2004. Cytotoxicity of lavender oil and its major components to human skin cells. Cell Proliferation. 37 (3), pp. 221-229.

‘Identification and isolation of polyhydroalkanoates and cloning of PHA biosynthetic genes from Bacillus cereus SPV
Valappil, S.P., Bucke, C. and Roy, I. 2004. ‘Identification and isolation of polyhydroalkanoates and cloning of PHA biosynthetic genes from Bacillus cereus SPV. Proceedings of the International Symposium on Biological Polyesters, ISBP. Beijing, China 22 - 28 Aug 2004

Biosynthesis of polyhydroxyalkanoic acids by Streptomyces coelicolor
Valappil, S.P., Bhatia, Y., Bucke, C. and Roy, I. 2004. Biosynthesis of polyhydroxyalkanoic acids by Streptomyces coelicolor. e-Polymers.

Cell surface thiol modification by GSNO: a mechanism of nitric oxide delivery?
Shah, C.M., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2004. Cell surface thiol modification by GSNO: a mechanism of nitric oxide delivery? 5th UK Nitric Oxide Forum. Edinburgh, UK 12/2004

Protein disulphide isomerase is involved in the delivery of NO from S-nitrosoglutathione into megakaryocytes
Shah, C.M., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2004. Protein disulphide isomerase is involved in the delivery of NO from S-nitrosoglutathione into megakaryocytes. 3rd International Conference on the Biology, Chemistry and Therapeutic Applications of Nitric Oxide: 4th Anuual Scientific Meeting of the Nitric Oxide Society of Japan. Nara, Japan 24-28 May 2004

Protein disulphide isomerase is involved in the delivery of NO from S-nitrosoglutathione into megakaryocytes
Shah, C.M., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2004. Protein disulphide isomerase is involved in the delivery of NO from S-nitrosoglutathione into megakaryocytes. Japan-UK Platelet Conference. Oxford, UK September 2004

Polyhydroxyalkanoate production by Bacillus cereus SPV
Roy, I. 2004. Polyhydroxyalkanoate production by Bacillus cereus SPV. Proceedings of the International Symposium on Biological Polyesters, ISBP. Beijing, China 22 - 28 Aug 2004

Establishment and analysis of 3-D collagen cultures of C-20/A4 chondrocytes
Petsa, A., Chowdrey, H.S., Knight, R.A., Afoke, A. and Locke, I.C. 2004. Establishment and analysis of 3-D collagen cultures of C-20/A4 chondrocytes. OARSI 2004 World Congress on Osteoarthritis. Chicago USA 12/2004

A CRH family peptide protects a human chondrocyte cell line against apoptosis
Intekhab-Alam, N.Y., Chowdrey, H.S., Knight, R.A., Locke, I.C. and Intekhab Alam, N.Y. 2004. A CRH family peptide protects a human chondrocyte cell line against apoptosis. OARSI 2004 World Congress on Osteoarthritis. Chicago USA 12/2004

Carbohydrates and carbohydrate active enzymes in Ganoderma applanatum
Budala, S., Bucke, C. and Roy, I. 2004. Carbohydrates and carbohydrate active enzymes in Ganoderma applanatum. Proceedings of the 22nd International Carbohydrate Symposium. Glasgow, UK 23 - 27 Jul 2004

Rapid S-nitrosothiol metabolism by platelets and megakaryocytes
Shah, C.M., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2003. Rapid S-nitrosothiol metabolism by platelets and megakaryocytes. Biochemical Society Transactions. 31 (6), pp. 1450-1452.

5-Aminolevulinic acid synthase: mechanism, mutations and medicine
Shoolingin-Jordan, P., Al-Daihan, S., Alexeev, D., Baxter, R.L., Bottomley, S.S., Kahari, I.D., Roy, I., Sarwar, M., Sawyer, L. and Wang, S.F. 2003. 5-Aminolevulinic acid synthase: mechanism, mutations and medicine. Biochimica et Biophysica Acta: Proteins and Proteomics. 1647 (1-2), pp. 361-365.

5-aminolevulinic acid synthase: mechanism, mutations and medicine
Shoolingin-Jordan, P., Al-Daihan, S., Alexeev, D., Baxter, R.L., Bottomley, S.S., Kahari, D., Roy, I., Sarwar, M., Sawyer, L. and Wang, S.F. 2003. 5-aminolevulinic acid synthase: mechanism, mutations and medicine. Biochimica et Biophysica Acta: Proteins and Proteomics. 1647 (1-2), pp. 361-366.

Biosynthesis of medium chain length polyhydroxyalakanoic acids by Streptomyces coelicolor
Valappil, S.P., Bucke, C. and Roy, I. 2003. Biosynthesis of medium chain length polyhydroxyalakanoic acids by Streptomyces coelicolor. ICBP 2003. Proceedings of the 1st IUPAC International Conference on Bio-Based Polymers. Saitama, Japan 12 - 14 Nov 2003

Role of protein disulphide isomerase in NO delivery from S-nitrosothiols into megakaryocytes
Shah, C.M., Locke, I.C., Chowdrey, H.S. and Gordge, M.P. 2003. Role of protein disulphide isomerase in NO delivery from S-nitrosothiols into megakaryocytes. 4th UK Nitric Oxide Forum. University of Nottingham, UK December 2003

The behaviour of C-20/A4 chondrocytes in 3-D collagen gel cultures
Petsa, A., Afoke, A., Chowdrey, H.S., Knight, R.A., Harris, A. and Locke, I.C. 2003. The behaviour of C-20/A4 chondrocytes in 3-D collagen gel cultures. OARSI 2003 World Congress on Osteoarthritis. Berlin, Germany October 2003

A possible role of poly-3-hydroxybutyric acid in antibiotic production in Streptomyces
Verma, S., Bhatia, Y., Valappil, S.P. and Roy, I. 2002. A possible role of poly-3-hydroxybutyric acid in antibiotic production in Streptomyces. Archives of Microbiology. 179 (1), pp. 66-69.

Ion-dependency of the streptococcal deoxyribonuclease "streptodornase", an active constituent of the medicament Varidase
Locke, I.C. and Carpenter, B.G. 2002. Ion-dependency of the streptococcal deoxyribonuclease "streptodornase", an active constituent of the medicament Varidase. Enzyme and Microbial Technology. 31 (4), pp. 482-489.

Biosynthesis of polyhydroxyalkanoates by Streptomyces coelicolor
Valappil, S.P., Bucke, C. and Roy, I. 2002. Biosynthesis of polyhydroxyalkanoates by Streptomyces coelicolor. Proceedings of the International Symposium on Biological Polyesters. Munster, Germany 22 - 26 Sep 2002

Effect of essential oils and their components on cell
Prashar, A., Veness, R., Locke, I.C. and Evans, C.S. 2002. Effect of essential oils and their components on cell. Future Trends in Phytochemistry. Gargnano, Italy

Production of polyhydroxybutyrate by streptomyces
Verma, S. and Roy, I. 2001. Production of polyhydroxybutyrate by streptomyces. Proceedings of the Gordon Research Conference. Connecticut, USA 2001

Varidase: the science behind the medicament
Rutter, P.M., Carpenter, B.G., Hill, S.S. and Locke, I.C. 2000. Varidase: the science behind the medicament. Journal of Wound Care. 9 (5), pp. 223-226.

A comparison of the characteristics of circulating anti-myeloperoxidase antibodies in vasculitis with those in non-vasculitic conditions
Locke, I.C., Leaker, B. and Cambridge, G. 1999. A comparison of the characteristics of circulating anti-myeloperoxidase antibodies in vasculitis with those in non-vasculitic conditions. Clinical and Experimental Immunology. 115 (2), pp. 369-376.

Phosphorylation of the periplasmic binding protein in two transport systems for arginine incorporation in Escherichia coli K-12 is unrelated to the function of the transport system
Celis, R.T.F., Leadlay, P.F., Roy, I. and Hansen, A. 1998. Phosphorylation of the periplasmic binding protein in two transport systems for arginine incorporation in Escherichia coli K-12 is unrelated to the function of the transport system. Journal of Bacteriology. 180 (18), pp. 4828-4833.

Metabolic Engineering, a route to the production of novel products
Roy, I. 1998. Metabolic Engineering, a route to the production of novel products. Proceedings of the National Conference on Bioprocessing and R-DNA Technology. Central Drug Research Institute, Lucknow, India 27 - 28 Mar 1998

A comparison of the variable region genes of two human monoclonal antibodies to myeloperoxidase
Locke, I.C., Rahman, M.A.A. and Cambridge, G. 1998. A comparison of the variable region genes of two human monoclonal antibodies to myeloperoxidase. British Society for Immunology 6th Annual Meeting. Harrogate, UK 12/1998

Adjacent proline residues in the inhibitory domain of the Oct-2 transcription factor play distinct functional roles
Liu, Y.Z., Lee, I.K., Locke, I.C., Dawson, S. and Latchman, D. 1998. Adjacent proline residues in the inhibitory domain of the Oct-2 transcription factor play distinct functional roles. Nucleic Acids Research. 26 (10), pp. 2464-2472.

Purification of a streptococcal deoxyribonuclease by affinity chromatography based on a DNA-cellulose matrix
Locke, I.C., Cox, S.F. and Carpenter, B.G. 1997. Purification of a streptococcal deoxyribonuclease by affinity chromatography based on a DNA-cellulose matrix. Journal of Chromatography A. 788 (1-2), pp. 75-80.

A Methylmalonyl-CoA mutase in Escherichia coli?
Roy, I. and Leadlay, P.F. 1997. A Methylmalonyl-CoA mutase in Escherichia coli? in: Ahmad, F. (ed.) Advances in gene technology: biomolecular design, form and function Nature Publishing Group.

Autoantibodies to myeloperoxidase in systemic sclerosis
Locke, I.C., Worral, J.G., Leaker, B., Black, C.M. and Cambridge, G. 1997. Autoantibodies to myeloperoxidase in systemic sclerosis. Journal of Rheumatology. 24 (1), pp. 86-89.

The masked cysteine residues in methylmalonyl-CoA mutase from Propionibacterium shermanii are essential for catalytic activity
Roy, I. 1996. The masked cysteine residues in methylmalonyl-CoA mutase from Propionibacterium shermanii are essential for catalytic activity. FEBS Letters. 394 (2), pp. 126-128.

Characteristics of antibodies to myeloperoxidase in vasculitic and non-vasculitic conditions
Locke, I.C., Leaker, B. and Cambridge, G. 1996. Characteristics of antibodies to myeloperoxidase in vasculitic and non-vasculitic conditions. American College of Rheumatology 60th National Scientific Meeting. Orlando, USA 10/1996

Characteristics of anti-myeloperoxidase autoantibodies in vasculitis and other conditions
Locke, I.C., Leaker, B. and Cambridge, G. 1996. Characteristics of anti-myeloperoxidase autoantibodies in vasculitis and other conditions. American Society of Nephrology 29th Annual Meeting. New Orleans, USA 11/1996

Autoantibodies to neutrophil granule proteins: pathogenic potential in vasculitis?
Locke, I.C. and Cambridge, G. 1996. Autoantibodies to neutrophil granule proteins: pathogenic potential in vasculitis? British Journal of Biomedical Science. 53 (4), pp. 302-316.

A human monoclonal anti-myeloperoxidase antibody can prime human neutrophils in vitro
Cambridge, G., Leaker, B., Locke, I.C., Noronha-Dutra, A. and Epperlein, M. 1996. A human monoclonal anti-myeloperoxidase antibody can prime human neutrophils in vitro. American Society of Nephrology 29th Annual Meeting. New Orleans, USA 11/1996

Autoantibodies to myeloperoxidase in systemic sclerosis
Worral, J.G., Locke, I.C., Leaker, B., Black, C.M. and Cambridge, G. 1995. Autoantibodies to myeloperoxidase in systemic sclerosis. British Society for Rheumatology Heberden Round 1995. Keele University, UK 9/1995

Automated analysis of the deoxyribonuclease active constituents of the medicament Varidase ®
Locke, I.C., Ramsay, M.P., Hill, S.S. and Carpenter, B.G. 1993. Automated analysis of the deoxyribonuclease active constituents of the medicament Varidase ®. The Journal of Automatic Chemistry. 15, pp. 65-70.

Physical map location of the new Escherichia coli gene sbm
Roy, I. and Leadlay, P.F. 1992. Physical map location of the new Escherichia coli gene sbm. Journal of Bacteriology. 174 (17), pp. 5763-5764.

Automated analysis of the deoxyribonuclease active constituents of the medicament Varidase ®
Locke, I.C., Ramsey, M.P., Hill, S.S. and Carpenter, B.G. 1992. Automated analysis of the deoxyribonuclease active constituents of the medicament Varidase ®. IMLS XX Triennial Conference. Liverpool, UK 9/1992

Mechanism and structure of a coenzyme-B12 dependent enzyme
Roy, I., Patchett, M.L., Keep, N.H. and Leadlay, P.F. 1990. Mechanism and structure of a coenzyme-B12 dependent enzyme. Proceedings of the Royal Society of Chemistry Fifth International Symposium on the Mechanisms of Reactions in Solution. University of Kent, UK 02 - 06 Jul 1990

Purification of the seed lectin from Dolichos biflorus by chromatofocusing
Rogers, D.J., Locke, I.C., Gibbs, R. and Carpenter, B.G. 1990. Purification of the seed lectin from Dolichos biflorus by chromatofocusing. 12th International Lectin Conference. University of Davis, USA 9/1990

The expression of adenosylcobalamin dependent methylmalonyl-CoA mutase from Propionibacterium shermanii in Escherichia coli
McKie, N., Keep, N.H., Roy, I., Patchett, M.L. and Leadlay, P.F. 1989. The expression of adenosylcobalamin dependent methylmalonyl-CoA mutase from Propionibacterium shermanii in Escherichia coli. Proceedings of the Royal Society of Chemistry International Symposium on the Molecular Mechanisms in Bioorganic Processes. University of Newcastle upon Tyne, UK 17 - 20 Jul 1989

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