3D culture of bone-derived cells immobilised in alginate following light-triggered gelation

Alan M. Smith, Jonathan J. Harris, Richard M. Shelton, Yvonne Perrie

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Photoreactive liposomes have been exploited as a means of developing 3D tissue constructs. Liposomes formulated using the photosensitive lipid 1,2-bis(4-(n-butyl)phenylazo-4'-phenylbutyroyl)phosphatidylcholine (Bis Azo PC), which undergoes conformational change on stimulation with long wavelength ultraviolet light, were prepared with entrapped CaCl(2) before being incorporated into a 4% alginate solution. It was shown that stimulation of the photosensitive lipid using a light emitting diode (LED) (peak emission at 385 nm, dose equivalent to 9 mJ/cm(2)) caused the release of liposome-entrapped CaCl(2), resulting in cross-linking of the alginate solution and immobilisation of bone-derived cells over a range of seeding densities, approximately 97% of which remained viable for periods of up to 14 days in culture. Entrapment volumes of a variety of liposome types were evaluated and interdigitating fusion vesicles were identified as having the highest payload (24%), however the inclusion of cholesterol as a means of shifting Bis Azo PC sensitivity into the visible light wavelengths resulted in an approximately 10-fold reduction in calcium entrapment. This application of light-sensitised liposomes offers the potential to create complex tissue engineering substrates containing cells immobilised in precise locations, in contrast with substrates onto which cells are seeded post-production.

LanguageEnglish
Pages94-101
Number of pages8
JournalJournal of Controlled Release
Volume119
Issue number1
DOIs
Publication statusPublished - 14 May 2007

Fingerprint

Immobilized Cells
Liposomes
Light
Bone and Bones
Lipids
Tissue Engineering
Ultraviolet Rays
Immobilization
Cholesterol
alginic acid
Calcium
1,2-bis(4-(n-butyl)phenylazo-4'-phenylbutyroyl)phosphatidylcholine

Keywords

  • alginates
  • bone marrow cells
  • cell culture techniques
  • cell survival
  • drug carriers
  • gels
  • glucuronic acid
  • hexuronic acids
  • liposomes
  • photic stimulation
  • rats

Cite this

Smith, Alan M. ; Harris, Jonathan J. ; Shelton, Richard M. ; Perrie, Yvonne. / 3D culture of bone-derived cells immobilised in alginate following light-triggered gelation. In: Journal of Controlled Release. 2007 ; Vol. 119, No. 1. pp. 94-101.
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abstract = "Photoreactive liposomes have been exploited as a means of developing 3D tissue constructs. Liposomes formulated using the photosensitive lipid 1,2-bis(4-(n-butyl)phenylazo-4'-phenylbutyroyl)phosphatidylcholine (Bis Azo PC), which undergoes conformational change on stimulation with long wavelength ultraviolet light, were prepared with entrapped CaCl(2) before being incorporated into a 4{\%} alginate solution. It was shown that stimulation of the photosensitive lipid using a light emitting diode (LED) (peak emission at 385 nm, dose equivalent to 9 mJ/cm(2)) caused the release of liposome-entrapped CaCl(2), resulting in cross-linking of the alginate solution and immobilisation of bone-derived cells over a range of seeding densities, approximately 97{\%} of which remained viable for periods of up to 14 days in culture. Entrapment volumes of a variety of liposome types were evaluated and interdigitating fusion vesicles were identified as having the highest payload (24{\%}), however the inclusion of cholesterol as a means of shifting Bis Azo PC sensitivity into the visible light wavelengths resulted in an approximately 10-fold reduction in calcium entrapment. This application of light-sensitised liposomes offers the potential to create complex tissue engineering substrates containing cells immobilised in precise locations, in contrast with substrates onto which cells are seeded post-production.",
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3D culture of bone-derived cells immobilised in alginate following light-triggered gelation. / Smith, Alan M.; Harris, Jonathan J.; Shelton, Richard M.; Perrie, Yvonne.

In: Journal of Controlled Release, Vol. 119, No. 1, 14.05.2007, p. 94-101.

Research output: Contribution to journalArticle

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AB - Photoreactive liposomes have been exploited as a means of developing 3D tissue constructs. Liposomes formulated using the photosensitive lipid 1,2-bis(4-(n-butyl)phenylazo-4'-phenylbutyroyl)phosphatidylcholine (Bis Azo PC), which undergoes conformational change on stimulation with long wavelength ultraviolet light, were prepared with entrapped CaCl(2) before being incorporated into a 4% alginate solution. It was shown that stimulation of the photosensitive lipid using a light emitting diode (LED) (peak emission at 385 nm, dose equivalent to 9 mJ/cm(2)) caused the release of liposome-entrapped CaCl(2), resulting in cross-linking of the alginate solution and immobilisation of bone-derived cells over a range of seeding densities, approximately 97% of which remained viable for periods of up to 14 days in culture. Entrapment volumes of a variety of liposome types were evaluated and interdigitating fusion vesicles were identified as having the highest payload (24%), however the inclusion of cholesterol as a means of shifting Bis Azo PC sensitivity into the visible light wavelengths resulted in an approximately 10-fold reduction in calcium entrapment. This application of light-sensitised liposomes offers the potential to create complex tissue engineering substrates containing cells immobilised in precise locations, in contrast with substrates onto which cells are seeded post-production.

KW - alginates

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KW - liposomes

KW - photic stimulation

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