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A novel 3D printing method for cell alignment and differentiation

VIEWS - 2399 (Abstract) 975 (PDF)
Ramya Bhuthalingam, Pei Qi Lim, Scott Alexander Irvine, Animesh Agrawal, Priyadarshini S Mhaisalkar, Jia An, Chee Kai Chua, Subbu Venkatraman

Abstract


The application of bioprinting allows precision deposition of biological materials for bioengineering applications. Here we propose a 2 stage methodology for bioprinting using a back pressure-driven, automated robotic dispensing system. This apparatus can prepare topographic guidance features for cell orientation and then bioprint cells directly onto them. Topographic guidance features generate cues that influence adhered cell morphology and phenotype. The robotic dispensing system was modified to include a sharpened stylus that etched on a polystyrene surface. The same computer-aided design (CAD) software was used for both precision control of etching and bioink deposition. Various etched groove patterns such as linear, concentric circles, and sinusoidal wave patterns were possible. Fibroblasts and mesenchymal stem cells (MSC) were able to sense the grooves, as shown by their elongation and orientation in the direction of the features. The orientated MSCs displayed indications of lineage commitment as detected by fluorescence-activated cell sorting (FACS) analysis. A 2% gelatin bioink was then used to dispense cells onto the etched features using identical, programmed co-ordinates. The bioink allows the cells to contact sense the pattern while containing their deposition within the printed pattern.The application of bioprinting allows the precision deposition of biological material for bioengineering applications. Here we propose a 2 stage methodology for bioprinting using a back pressure driven automated robotic dispensing system. This apparatus can prepare topographic guidance features for cell orientation and then bioprint cells directly to them. Topographic guidance features generate cues that influence adhered cell morphology and phenotype. The robotic dispensing system was modified to include a sharpened stylus that etched a polystyrene surface. The same CAD software was used for both precision control of etching and bioink deposition. Various etched groove patterns were possible, such as linear, concentric circles and sinusoidal wave patterns. Fibroblasts and mesenchymal stem cells (MSC) could sense the grooves, elongating and orientating themselves in the direction of the features, with the MSCs displaying indications of lineage commitment. A 2% gelatin bioink was then used to dispense cells onto the etched features using identical programmed co-ordinates. The bioink allows the cells to contact sense the pattern while containing their deposition within the printed pattern.


Keywords


Bioprinting; surface guidance; automated robotic depositon; precision etching; bioink; stem cells

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References


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DOI: http://dx.doi.org/10.18063/IJB.2015.01.008

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Copyright (c) 2017 Ramya Bhuthalingam, Pei Qi Lim, Scott Alexander Irvine, Animesh Agrawal, Priyadarshini S Mhaisalkar, Jia An, Chee Kai Chua, Subbu Venkatraman

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