Iron oxide nanoparticle-stabilized Pickering emulsion-templated porous scaffolds loaded with polyunsaturated fatty acids (PUFAs) for bone tissue engineering

Dietary intake of ω-3-polyunsaturated fatty acids (PUFAs) can significantly improve the expression levels of alkaline phosphatase (ALP) and osteocalcin. However, PUFAs are hydrophobic and highly sensitive to temperature, oxygen concentration, pH, and ionic strength. Hence, it is challenging to use P...

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Veröffentlicht in:Journal of materials chemistry. B, Materials for biology and medicine Materials for biology and medicine, 2024-09, Vol.12 (37), p.9312-9324
Hauptverfasser: Aadinath, W, , Saravanakumar, Iniyan, Muthuvijayan, Vignesh
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creator Aadinath, W

Saravanakumar, Iniyan
Muthuvijayan, Vignesh
description Dietary intake of ω-3-polyunsaturated fatty acids (PUFAs) can significantly improve the expression levels of alkaline phosphatase (ALP) and osteocalcin. However, PUFAs are hydrophobic and highly sensitive to temperature, oxygen concentration, pH, and ionic strength. Hence, it is challenging to use PUFAs as bioactive compounds for bone tissue engineering. Here, we encapsulated PUFAs in liposomes to improve their stability. The hydrodynamic size of the PUFA-loaded liposomes was found to be 121.3 ± 35 nm. GC-MS analysis showed that the encapsulation efficiency of the PUFAs was 19.9 ± 3.4%. These PUFA-loaded liposomes were loaded into porous scaffolds that were prepared by polymerizing glycidyl methacrylate and trimethylolpropane triacrylate monomers using the Pickering emulsion polymerization technique. Oleic acid-coated iron oxide nanoparticles were used as the stabilizing agent to prepare these acrylate-based scaffolds containing PUFA-loaded liposomes (P-Lipo-IO(GMA-TMPTA)). SEM micrographs confirmed the porous nature of the scaffolds and the presence of well-adhered liposomes. An in vitro cytotoxicity study conducted using MG63 cells confirmed that these scaffolds showed desirable cytocompatibility. Cell adhesion study showed a well-spread morphology, indicating firm adhesion of the cells. The alizarin red staining of P-Lipo-IO(GMA-TMPTA) scaffolds showed 3- and 2-fold higher calcium deposition compared to the control on days 7 and 14, respectively. ALP activity was also 2-fold higher than that of the control on day 14. RT-PCR analysis of cells exposed to P-Lipo-IO(GMA-TMPTA) scaffolds showed significantly higher expression of osteogenic markers compared to the control. An antibacterial study conducted on Staphylococcus aureus showed a higher percentage inhibition and reactive oxygen species generation in samples treated with P-Lipo-IO(GMA-TMPTA) scaffolds. These desirable biological properties indicate that the developed scaffolds are suitable for bone tissue engineering. Polyunsaturated fatty acids (PUFAs) loaded onto the porous acrylate-based scaffolds significantly enhance the expression of osteogenic markers.
doi_str_mv 10.1039/d4tb00286e
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An in vitro cytotoxicity study conducted using MG63 cells confirmed that these scaffolds showed desirable cytocompatibility. Cell adhesion study showed a well-spread morphology, indicating firm adhesion of the cells. The alizarin red staining of P-Lipo-IO(GMA-TMPTA) scaffolds showed 3- and 2-fold higher calcium deposition compared to the control on days 7 and 14, respectively. ALP activity was also 2-fold higher than that of the control on day 14. RT-PCR analysis of cells exposed to P-Lipo-IO(GMA-TMPTA) scaffolds showed significantly higher expression of osteogenic markers compared to the control. An antibacterial study conducted on Staphylococcus aureus showed a higher percentage inhibition and reactive oxygen species generation in samples treated with P-Lipo-IO(GMA-TMPTA) scaffolds. These desirable biological properties indicate that the developed scaffolds are suitable for bone tissue engineering. 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However, PUFAs are hydrophobic and highly sensitive to temperature, oxygen concentration, pH, and ionic strength. Hence, it is challenging to use PUFAs as bioactive compounds for bone tissue engineering. Here, we encapsulated PUFAs in liposomes to improve their stability. The hydrodynamic size of the PUFA-loaded liposomes was found to be 121.3 ± 35 nm. GC-MS analysis showed that the encapsulation efficiency of the PUFAs was 19.9 ± 3.4%. These PUFA-loaded liposomes were loaded into porous scaffolds that were prepared by polymerizing glycidyl methacrylate and trimethylolpropane triacrylate monomers using the Pickering emulsion polymerization technique. Oleic acid-coated iron oxide nanoparticles were used as the stabilizing agent to prepare these acrylate-based scaffolds containing PUFA-loaded liposomes (P-Lipo-IO(GMA-TMPTA)). SEM micrographs confirmed the porous nature of the scaffolds and the presence of well-adhered liposomes. An in vitro cytotoxicity study conducted using MG63 cells confirmed that these scaffolds showed desirable cytocompatibility. Cell adhesion study showed a well-spread morphology, indicating firm adhesion of the cells. The alizarin red staining of P-Lipo-IO(GMA-TMPTA) scaffolds showed 3- and 2-fold higher calcium deposition compared to the control on days 7 and 14, respectively. ALP activity was also 2-fold higher than that of the control on day 14. RT-PCR analysis of cells exposed to P-Lipo-IO(GMA-TMPTA) scaffolds showed significantly higher expression of osteogenic markers compared to the control. An antibacterial study conducted on Staphylococcus aureus showed a higher percentage inhibition and reactive oxygen species generation in samples treated with P-Lipo-IO(GMA-TMPTA) scaffolds. These desirable biological properties indicate that the developed scaffolds are suitable for bone tissue engineering. Polyunsaturated fatty acids (PUFAs) loaded onto the porous acrylate-based scaffolds significantly enhance the expression of osteogenic markers.</abstract><cop>England</cop><pub>Royal Society of Chemistry</pub><pmid>39171408</pmid><doi>10.1039/d4tb00286e</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0003-4921-9073</orcidid></addata></record>
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source Royal Society Of Chemistry Journals 2008-
subjects Adhesion
Alizarin
Alkaline phosphatase
Bioactive compounds
Biocompatibility
Biological properties
Bones
Cell adhesion
Cytotoxicity
Diet
Dietary intake
Emulsion polymerization
Emulsions
Encapsulation
Fatty acids
Food intake
Hydrophobicity
Ionic strength
Iron oxides
Liposomes
Nanoparticles
Oleic acid
Osteocalcin
Oxygen
Photomicrographs
Polyunsaturated fatty acids
Reactive oxygen species
Scaffolds
Stabilizers (agents)
Tissue engineering
Trimethylolpropane triacrylate
title Iron oxide nanoparticle-stabilized Pickering emulsion-templated porous scaffolds loaded with polyunsaturated fatty acids (PUFAs) for bone tissue engineering
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