Journal
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
Volume 19, Issue 10, Pages 1347-1362Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1163/156856208786052371
Keywords
Micropatterning; vascular smooth muscle cell orientation; scaffold engineering
Funding
- NHLBI NIH HHS [R01 HL072900-04, R01 HL072900] Funding Source: Medline
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL072900] Funding Source: NIH RePORTER
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Successful artificial tissue scaffolds support regeneration by promoting cellular organization as well as appropriate mechanical and biological functionality. We have previously shown in vitro that 2-D substrates with micrometer-scale grooves (5 mu m deep, 18 mu m wide, with 12 mu m spacing) can induce cell orientation and ECM alignment. Here, we have transferred this microtopography onto biodegradable polycaprolactone (PCL) thin films. We further developed a technique to layer these cellularized microtextured scaffolds into a 3-D tissue construct. A surface modification technique was used to attach photoreactive acrylate groups on the PCL scaffold surface onto which poly(ethylene glycol)-diacrylate (PEG-DA) gel could be photopolymerized. PEG-DA serves as an adhesive layer between PCL scaffolds, resulting in a VSMC-seeded layered 3-D composite structure that is highly organized and structurally stable. The PCL surface modification chemistry was confirmed via XPS, and the maintenance of cell number and orientation on the modified PCL scaffolds was demonstrated using colorimetric and imaging techniques. Cell number and orientation were also investigated after cells were cultured in the layered 3-D configuration. Such 3-D tissue mimics fabricated with precise cellular organization will enable systematic testing of the effects of cellular orientation on the functional and mechanical properties of tissue-engineered blood vessels.
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