Pastable, Adhesive, Injectable, Nanofibrous, and Tunable (PAINT) Biphasic Hybrid Matrices as Versatile Therapeutic Carriers

Seung Hyun Kim, Kyujin Hwang, Haesung A. Lee, Joowon Kim, Mira Cho, Miri Kim, Jeong Eun Shin, Haeshin Lee, Kook In Park, Jae Hyung Jang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A critical challenge in many pharmaceutical fields is developing versatile adjuvant devices that can reduce the off-target delivery of therapeutic materials to target lesions. Herein, a biphasic hybrid fibrous system that can manipulate the spatial and temporal delivery of various therapeutic agents to target lesions by integrating multiple distinct systems and technologies such as fluffy coaxial electrospun polycaprolactone (PCL)/polystyrene (PS) fibers, cyclohexane-mediated leaching to remove PS layers selectively, amine display on PCL fibers, conjugation of naturally occurring adhesive gallol molecules onto hyaluronic acid (HA-g), and electrostatically complexing the aminated PCL fibers with the gallol-conjugated HA. In the context of “paintable” systems on target lesions, the resulting system is called a PAINT matrix (abbreviated according to the initial letter of its features: pastable, adhesive, injectable, nanofibrous, and tunable). Its viscoelastic property, which was attributed by coalescing aminated PCL fibers with viscous HA-g, enabled it to be noninvasively injected and fit into any cavity in the body with various morphologies, manually pasted on tissue surfaces, and adhered onto moisture-rich surfaces to ensure the secure delivery of therapeutics toward the target lesions. The PAINT matrix efficiently supplied immunomodulatory human neural stem cells (hNSCs) at rat hemisectioned spinal cord injury (SCI) sites and promoted both locomotive and sensory recovery in SCI models, presumably by protecting hNSCs against host immunosurveillance. The PAINT matrix will be broadly utilized for efficiently delivering therapeutics to difficult-to-reach target lesions by direct infusion or conventional biomaterial-mediated approaches due to their locations, wet surfaces, or complicated ambient environments.

Original languageEnglish
Pages (from-to)42429-42441
Number of pages13
JournalACS Applied Materials and Interfaces
Issue number36
Publication statusPublished - 2021 Sept 15

Bibliographical note

Funding Information:
This work was supported by the Bio & Medical Technology Development Program (NRF-2019M3A9H1032791, NRF-2018M3A9H2019045, and NRF-2017M3A9B4061968), the Basic Science Research Program (NRF-2018R1A2A2A05020786) funded by the National Research Foundation of Korea (NRF) grant funded by the Korea government, and a grant (21173MFDS562) from Ministry of Food and Drug Safety.

Publisher Copyright:
© 2021 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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