Oxygen-releasing nanofibers for breathable bone tissue engineering application

Abstract

Oxygen is a vital molecule for cell and tissue processes. Electrospun fibers have been extensively used as drug loading carriers due to possibility of well control over drug release with modulating fiber properties. However, they have not been used as depots for oxygen release. In the present study, an oxygen-releasing nanofibrous scaffold has been developed by electrospinning of polylactic acid/nano-calcium peroxide suspension with different polylactic acid concentrations (6.5 and 13% w/v). The electrospun fibers with calcium peroxide cargo provided oxygen content of 30–94 mmHg in a period of 14 days which lies well within the oxygen level of osseous tissue. The release profile of 13% polylactic acid fibers was different with that of 6.5% fibers with respects to the initial content of released oxygen and the release rate. Not only did 13% fibers supply oxygen with a slower rate, but also they resulted in a lower burst release of oxygen. Cell culture studies in hypoxia corroborated that 13% polylactic acid fibers better preserve cell viability comparing 6.5% counterparts as perceived by MTT assay. Moreover, they endowed more favored milieu for adherence, arrangement and migration of mesenchymal stem cells as confirmed by microscopy images. The oxygen-releasing fibers equally affected alkaline phosphatase, osteocalcin, and calcium deposition by mesenchymal stem cells most likely due to interplay between topographical and metabolic cues offered by 6.5 and 13% formulations.

Nanofibrous composite from polycaprolactone‐polyethylene glycol‐aloe vera as a promising scaffold for bone repairing

“…At each time point, the cells were fixed with paraformaldehyde (2% wt/vol) for 40 min and then stained with Alizarin red (2% wt/vol) solution (pH = 4.2) for 45 min at room temperature. Finally, the superfluous color was removed with extensive washing and the cells were observed by an optical microscope with a 40× objective 23 …”

“…Finally, the superfluous color was removed with extensive washing and the cells were observed by an optical microscope with a 40Â objective. 23…”

Electrospun Composite Bead-on-String Nanofibers Containing CaO2 Nanoparticles and MnO2 Nanosheets as Oxygen-Release Systems for Biomedical Applications

“…Overall, our results indicate the potential of electrospun fibers exhibiting a bead-on-string structure, especially the PLA/7.5_CaO 2 /1.25_MnO 2 formulation, as a controlled oxygen-release system for periodontitis treatment. To date, some studies have explored the electrospinning technique to prepare composite membranes as oxygen-release systems. − However, none of them reported the incorporation of calcium peroxide nanoparticles as well as manganese dioxide into the fiber structure. In addition, such studies did not report the bead-on-string structure and were not devoted to the application of periodontitis treatment.…”

Influence of process parameters on the characteristics of oxygen‐releasing poly (lactic acid) microparticles: A multioptimization strategy

“…The oxygen release profiles achieved in the current study suggest that the desired oxygen release profile can be achieved by changing various process parameters. Such tunable systems would be highly desirable as the demand for oxygen varies in different applications 34‐36 …”