title: Pluripotent stem cell expansion and neural differentiation in 3-D scaffolds of tunable Poisson's ratio.
abstract: Biophysical properties of the scaffolds such as the elastic modulus, have been recently shown to impact stem cell lineage commitment. On the other hand, the contribution of the Poisson's ratio, another important biophysical property, to the stem cell fate decision, has not been studied. Scaffolds with tunable Poisson's ratio (ν) (termed as auxetic scaffolds when Poisson's ratio is zero or negative) are anticipated to provide a spectrum of unique biophysical 3-D microenvironments to influence stem cell fate. To test this hypothesis, in the present work we fabricated auxetic polyurethane scaffolds (ν=0 to -0.45) and evaluated their effects on neural differentiation of mouse embryonic stem cells (ESCs) and human induced pluripotent stem cells (hiPSCs). Compared to the regular scaffolds (ν=+0.30) before auxetic conversion, the auxetic scaffolds supported smaller aggregate formation and higher expression of β-tubulin III upon neural differentiation. The influences of pore structure, Poisson's ratio, and elastic modulus on neural lineage commitment were further evaluated using a series of auxetic scaffolds. The results indicate that Poisson's ratio may confound the effects of elastic modulus, and auxetic scaffolds with proper pore structure and Poisson's ratio enhance neural differentiation. This study demonstrates that tuning the Poisson's ratio of the scaffolds together with elastic modulus and microstructure would enhance the capability to generate broader, more diversified ranges of biophysical 3-D microenvironments for the modulation of cellular differentiation.
  
  
  
  Biophysical signaling from the substrates and scaffolds plays a critical role in neural lineage commitment of pluripotent stem cells. While the contribution of elastic modulus has been well studied, the influence of Poisson's ratio along with microstructure of the scaffolds remains unknown largely due to the lack of technology to produce materials with tailorable Poisson's ratio. This study fabricated auxetic polyurethane scaffolds with different elastic modulus, Poisson's ratio and microstructure and evaluated neural differentiation of pluripotent stem cells. The findings add a novel angle to understand the impact of biophysical microenvironment on stem cell fate decisions.
authors.affiliation: Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USA.
authors.forename: Yuanwei
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USA; The High-performance Materials Institute, Florida State University, Tallahassee, FL, USA.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USA.
authors.forename: Liqing
authors.initials: L
authors.lastname: Song
authors.affiliation: Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USA; The High-performance Materials Institute, Florida State University, Tallahassee, FL, USA.
authors.forename: Changchun
authors.initials: C
authors.lastname: Zeng
authors.affiliation: Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USA. Electronic address: yli@eng.fsu.edu.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D055592:Biophysical Phenomena; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D015638:Cytochalasin D / Q000494:pharmacology; D055119:Elastic Modulus; D006801:Humans; D051379:Mice; D000066450:Mouse Embryonic Stem Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D039904:Pluripotent Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D011140:Polyurethanes / Q000737:chemistry; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D015415:Biomarkers; D011140:Polyurethanes; D015638:Cytochalasin D
keywords: Auxetic scaffold; Neural differentiation; Pluripotent stem cell; Poisson’s ratio