Biomaterials Research (생체재료학회지)

Korean Society for Biomaterials (한국생체재료학회)
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Fabrication of a microfluidic device for studying the in situ drug-loading/release behavior of graphene oxide-encapsulated hydrogel beads

  • Veerla, Sarath Chandra (Department of Organic Materials Engineering, Chungnam National University) ;
  • Kim, Da Reum (Department of Organic Materials Engineering, Chungnam National University) ;
  • Yang, Sung Yun (Department of Organic Materials Engineering, Chungnam National University)
  • Received : 2018.01.15
  • Accepted : 2018.02.28
  • Published : 2018.03.01
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Abstract

Background: Controlled drug delivery system is highly important for not only prolonged the efficacy of drug but also cellular development for tissue engineering. A number of biopolymer composites and nanostructured carriers behave been used for the controlled drug delivery of therapeutics. Recently, in vitro microfluidic devices that mimic the human body have been developed for drug-delivery applications. Methods: A microfluidic channel was fabricated via a two-step process: (i) polydimethyl siloxane (PDMS) and curing agent were poured with a 10:2 mass ratio onto an acrylic mold with two steel pipes, and (ii) calcium alginate beads were synthesized using sodium alginate and calcium chloride solutions. Different amounts (10, 25, $50{\mu}g$) of graphene oxide (GO) were then added by Hummers method, and studies on the encapsulation and release of the model drug, risedronate (Ris), were performed using control hydrogel beads (pH 6.3), GO-containing beads (10GO, 25GO and 50GO), and different pH conditions. MC3T3 osteoblastic cells were cultured in a microchannel with Ris-loaded GO-hydrogel beads, and their proliferation, viability, attachment and spreading were assessed for a week. Results: The spongy and textured morphology of pristine hydrogel beads was converted to flowery and rodshaped structures in drug-loaded hydrogel beads at reduced pH (6.3) and at a lower concentration ($10{\mu}g$) of GO. These latter 10GO drug-loaded beads rapidly released their cargo owing to the calcium phosphate deposited on the surface. Notably, beads containing a higher amount of GO (50GO) exhibited an extended drug-release profile. We further found that MC3T3 cells proliferated continuously in vitro in the microfluidic channel containing the GO-hydrogel system. MTT and live/dead assays showed similar proliferative potential of MC3T3 cells. Therefore, a microfluidic device with microchannels containing hydrogel beads formulated with different amounts of GO and tested under various pH conditions could be a promising system for controlled drug release. Conclusions: The GO and drug (risedronate, Rig) were directed loaded into a hydrogel placed in a microchannel. Through interactions such as hydrogen bonding between Go and the Rig-loaded GO-hydrogel beads, the bead-loaded microfluidic device supported MC3T3 proliferation and development as osteoblast without additional osteogenic differentiation supplements.

Keywords

Acknowledgement

Supported by : National Research Foundation (NRF)

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  1. Retraction Note: Fabrication of a microfluidic device for studying the in situ drug-loading/release behavior of graphene oxide-encapsulated hydrogel beads vol.22, pp.1, 2018, https://doi.org/10.1186/s40824-018-0125-y