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Research Article

Enhanced cellular infiltration of tissue-engineered scaffolds fabricated by PLLA nanogrooved microfibers

Lei Zhan1,§Lingtian Wang2,§Jixia Deng1Yi Zheng1Qinfei Ke1Xinrui Yang3( )Xing Zhang3Weitao Jia2( )Chen Huang1( )
Engineering Research Center of Technical Textiles, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China
Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
Department of Vascular Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200011, China

§ Lei Zhan and Lingtian Wang contributed equally to this work.

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Graphical Abstract

Inspired by the fact that pore size of fibrous architectures is always positively related to fiber diameter, we fabricated three-dimensional (3D) electrospun scaffolds composed of poly(L-lactic acid) (PLLA) microfibers with nanogrooves on fiber surface. The topographical cues from nanogrooves ensured fast cell adhesion, whilst the stable large pores formed by microfibers enabled sufficient cell ingrowth.

Abstract

Nanofibers prepared by electrospinning technique are extensively applied as building blocks for tissue-engineered scaffolds because of their high resemblance to natural extracellular matrix (ECM) and the capacity to provide more cell contacts than microfibers. However, conventional electrospun scaffolds only allow superficial growth of cells in that the size of inter-fiber pores is much smaller than the size of cells. By taking advantage of the positive correlation between fiber diameter and pore size in fibrous materials, we report here a simple method for fabricating poly-L-lactic acid (PLLA) microfiber scaffold with longitudinally aligned nanogrooves on fiber surface. Three-dimensional (3D) and structurally stable PLLA scaffolds with an average pore size of 16 μm were successfully acquired when the fiber diameter was 4.22 μm. The topographical cues from nanogrooves ensured fast cell adhesion of scaffolds, whilst the large inter-fiber pores enabled sufficient cell infiltration. Moreover, the nanogrooved microfiber scaffold showed improved curative effects of wound healing in a rat skin injury model, making us believe its practical significance in biomedical areas that requires fast cell adhesion and high cell infiltration.

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Nano Research
Pages 1614-1625
Cite this article:
Zhan L, Wang L, Deng J, et al. Enhanced cellular infiltration of tissue-engineered scaffolds fabricated by PLLA nanogrooved microfibers. Nano Research, 2023, 16(1): 1614-1625. https://doi.org/10.1007/s12274-022-4838-9
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Received: 16 June 2022
Revised: 26 July 2022
Accepted: 30 July 2022
Published: 26 August 2022
© Tsinghua University Press 2022
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