Open AccessBiomimicking Fiber Scaffold as an Effective In Vitro and In Vivo MicroRNA Screening Platform for Directing Tissue Regeneration
Author(s) -
Zhang Na,
Milbreta Ulla,
Chin Jiah Shin,
Pinese Coline,
Lin Junquan,
Shirahama Hitomi,
Jiang Wei,
Liu Hang,
Mi Ruifa,
Hoke Ahmet,
Wu Wutian,
Chew Sing Yian
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201800808
Subject(s) - in vivo , microrna , gene silencing , regeneration (biology) , in vitro , microbiology and biotechnology , biology , gene , biochemistry
MicroRNAs effectively modulate protein expression and cellular response. Unfortunately, the lack of robust nonviral delivery platforms has limited the therapeutic application of microRNAs. Additionally, there is a shortage of drug‐screening platforms that are directly translatable from in vitro to in vivo. Here, a fiber substrate that provides nonviral delivery of microRNAs for in vitro and in vivo microRNA screening is introduced. As a proof of concept, difficult‐to‐transfect primary neurons are targeted and the efficacy of this system is evaluated in a rat spinal cord injury model. With this platform, enhanced gene‐silencing is achieved in neurons as compared to conventional bolus delivery ( p < 0.05). Thereafter, four well‐recognized microRNAs (miR‐21, miR‐222, miR‐132, and miR‐431) and their cocktails are screened systematically. Regardless of age and origin of the neurons, similar trends are observed. Next, this fiber substrate is translated into a 3D system for direct in vivo microRNA screening. Robust nerve ingrowth is observed as early as two weeks after scaffold implantation. Nerve regeneration in response to the microRNA cocktails is similar to in vitro experiments. Altogether, the potential of the fiber platform is demonstrated in providing effective microRNA screening and direct translation into in vivo applications.