Abstract
To effectively harness the great potential of stem cells, we designed a dual growth factor delivery system for the application toward stem cell differentiation into specific lineages. This system carries a core-shell structure within microcapsules made of poly(l-lactide-co-glycolide) (PLGA) and alginate, which were fabricated using a coaxial electro-dropping method. Both PLGA and alginate were supplied from the inner and outer nozzles, respectively. The size and shape of microcapsules were greatly varying depending on the variables: nozzle size, applied voltage, volumetric feeding ratio (PLGA:alginate), feeding rate, and polymer concentrations. Once proper conditions were met, single or multi PLGA cores were found settled within the microcapsules. From the microscopic images, wrinkled surfaces of microcapsules were observed, along with the PLGA cores inside the alginate domain. When two different microcapsules were made, switching the position of bone morphogenetic protein (BMP)-2 and dexamethasone (Dex) for either core or shell domain, their release profiles were very unique on a temporal basis, based on their location in the microcapsules. An initial burst of biomolecules was highly suppressed when either biomolecule was loaded in the PLGA core. It was clear that the osteogenic biomolecules encapsulated in the microcapsule could be released together and their concentrations were disparate at each time point. Meanwhile as the hydrogel constructs including rat bone marrow stromal cells (BMSCs) and osteogenic factor-loaded microcapsules were cultured for up to 4. weeks, the gene expressions levels of osteopontin, type I collagen, and osteocalcin were significantly upregulated as compared to the control group. The present coaxial system was very effective in manufacturing PLGA core-alginate shell microcapsules and in encapsulating multiple biomolecules essential for stem cell differentiation.
| Original language | English |
|---|---|
| Pages (from-to) | 193-201 |
| Number of pages | 9 |
| Journal | Journal of Controlled Release |
| Volume | 147 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2010 Oct 15 |
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Keywords
- Alginate
- Coaxial system
- Core-shell microcapsule
- Dual growth factor delivery
- PLGA
- Stem cells
ASJC Scopus subject areas
- Pharmaceutical Science
Cite this
Fabrication of core-shell microcapsules using PLGA and alginate for dual growth factor delivery system. / Choi, Dong Hoon; Park, Chul Ho; Kim, Ik Hwan; Chun, Heung Jae; Park, Kwideok; Han, Dong Keun.
In: Journal of Controlled Release, Vol. 147, No. 2, 15.10.2010, p. 193-201.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fabrication of core-shell microcapsules using PLGA and alginate for dual growth factor delivery system
AU - Choi, Dong Hoon
AU - Park, Chul Ho
AU - Kim, Ik Hwan
AU - Chun, Heung Jae
AU - Park, Kwideok
AU - Han, Dong Keun
PY - 2010/10/15
Y1 - 2010/10/15
N2 - To effectively harness the great potential of stem cells, we designed a dual growth factor delivery system for the application toward stem cell differentiation into specific lineages. This system carries a core-shell structure within microcapsules made of poly(l-lactide-co-glycolide) (PLGA) and alginate, which were fabricated using a coaxial electro-dropping method. Both PLGA and alginate were supplied from the inner and outer nozzles, respectively. The size and shape of microcapsules were greatly varying depending on the variables: nozzle size, applied voltage, volumetric feeding ratio (PLGA:alginate), feeding rate, and polymer concentrations. Once proper conditions were met, single or multi PLGA cores were found settled within the microcapsules. From the microscopic images, wrinkled surfaces of microcapsules were observed, along with the PLGA cores inside the alginate domain. When two different microcapsules were made, switching the position of bone morphogenetic protein (BMP)-2 and dexamethasone (Dex) for either core or shell domain, their release profiles were very unique on a temporal basis, based on their location in the microcapsules. An initial burst of biomolecules was highly suppressed when either biomolecule was loaded in the PLGA core. It was clear that the osteogenic biomolecules encapsulated in the microcapsule could be released together and their concentrations were disparate at each time point. Meanwhile as the hydrogel constructs including rat bone marrow stromal cells (BMSCs) and osteogenic factor-loaded microcapsules were cultured for up to 4. weeks, the gene expressions levels of osteopontin, type I collagen, and osteocalcin were significantly upregulated as compared to the control group. The present coaxial system was very effective in manufacturing PLGA core-alginate shell microcapsules and in encapsulating multiple biomolecules essential for stem cell differentiation.
AB - To effectively harness the great potential of stem cells, we designed a dual growth factor delivery system for the application toward stem cell differentiation into specific lineages. This system carries a core-shell structure within microcapsules made of poly(l-lactide-co-glycolide) (PLGA) and alginate, which were fabricated using a coaxial electro-dropping method. Both PLGA and alginate were supplied from the inner and outer nozzles, respectively. The size and shape of microcapsules were greatly varying depending on the variables: nozzle size, applied voltage, volumetric feeding ratio (PLGA:alginate), feeding rate, and polymer concentrations. Once proper conditions were met, single or multi PLGA cores were found settled within the microcapsules. From the microscopic images, wrinkled surfaces of microcapsules were observed, along with the PLGA cores inside the alginate domain. When two different microcapsules were made, switching the position of bone morphogenetic protein (BMP)-2 and dexamethasone (Dex) for either core or shell domain, their release profiles were very unique on a temporal basis, based on their location in the microcapsules. An initial burst of biomolecules was highly suppressed when either biomolecule was loaded in the PLGA core. It was clear that the osteogenic biomolecules encapsulated in the microcapsule could be released together and their concentrations were disparate at each time point. Meanwhile as the hydrogel constructs including rat bone marrow stromal cells (BMSCs) and osteogenic factor-loaded microcapsules were cultured for up to 4. weeks, the gene expressions levels of osteopontin, type I collagen, and osteocalcin were significantly upregulated as compared to the control group. The present coaxial system was very effective in manufacturing PLGA core-alginate shell microcapsules and in encapsulating multiple biomolecules essential for stem cell differentiation.
KW - Alginate
KW - Coaxial system
KW - Core-shell microcapsule
KW - Dual growth factor delivery
KW - PLGA
KW - Stem cells
UR - http://www.scopus.com/inward/record.url?scp=77957018566&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957018566&partnerID=8YFLogxK
U2 - 10.1016/j.jconrel.2010.07.103
DO - 10.1016/j.jconrel.2010.07.103
M3 - Article
VL - 147
SP - 193
EP - 201
JO - Journal of Controlled Release
JF - Journal of Controlled Release
SN - 0168-3659
IS - 2
ER -