Independent Tuning of Nano-Ligand Frequency and Sequences Regulates the Adhesion and Differentiation of Stem Cells

Sunhong Min, Yoo Sang Jeon, Hee Joon Jung, Chandra Khatua, Na Li, Gunhyu Bae, Hyojun Choi, Hyunsik Hong, Jeong Eun Shin, Min Jun Ko, Han Seok Ko, Indong Jun, Hong En Fu, Seung Hyun Kim, Ramar Thangam, Jae Jun Song, Vinayak P. Dravid, Young Keun Kim*, Heemin Kang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The native extracellular matrix (ECM) can exhibit heterogeneous nano-sequences periodically displaying ligands to regulate complex cell–material interactions in vivo. Herein, an ECM-emulating heterogeneous barcoding system, including ligand-bearing Au and ligand-free Fe nano-segments, is developed to independently present tunable frequency and sequences in nano-segments of cell-adhesive RGD ligand. Specifically, similar exposed surface areas of total Fe and Au nano-segments are designed. Fe segments are used for substrate coupling of nanobarcodes and as ligand-free nano-segments and Au segments for ligand coating while maintaining both nanoscale (local) and macroscale (total) ligand density constant in all groups. Low nano-ligand frequency in the same sequences and terminally sequenced nano-ligands at the same frequency independently facilitate focal adhesion and mechanosensing of stem cells, which are collectively effective both in vitro and in vivo, thereby inducing stem cell differentiation. The Fe/RGD-Au nanobarcode implants exhibit high stability and no local and systemic toxicity in various tissues and organs in vivo. This work sheds novel insight into designing biomaterials with heterogeneous nano-ligand sequences at terminal sides and/or low frequency to facilitate cellular adhesion. Tuning the electrodeposition conditions can allow synthesis of unlimited combinations of ligand nano-sequences and frequencies, magnetic elements, and bioactive ligands to remotely regulate numerous host cells in vivo.

Original languageEnglish (US)
Article number2004300
JournalAdvanced Materials
Issue number40
StatePublished - Oct 1 2020


  • cell adhesion
  • nano-ligand frequencies
  • nano-ligand sequences
  • stem cell differentiation
  • unlimited nanobarcode tunability

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)


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