Seung‐Woo Cho

Current hyaluronic acid (HA) hydrogel systems often cause cytotoxicity to encapsulated cells and lack the adhesive property required for effective localization of transplanted cells in vivo. In addition, the injection of hydrogel into certain organs (e.g., liver, heart) induces tissue damage and hemorrhage. In this study, we describe a bioinspired, tissue‐adhesive hydrogel that overcomes the limitations of current HA hydrogels through its improved biocompatibility and potential for minimally inv

Brain organoids derived from human pluripotent stem cells provide a highly valuable in vitro model to recapitulate human brain development and neurological diseases. However, the current systems for brain organoid culture require further improvement for the reliable production of high-quality organoids. Here, we demonstrate two engineering elements to improve human brain organoid culture, (1) a human brain extracellular matrix to provide brain-specific cues and (2) a microfluidic device with per

Matrigel, a mouse tumor extracellular matrix protein mixture, is an indispensable component of most organoid tissue culture. However, it has limited the utility of organoids for drug development and regenerative medicine due to its tumor-derived origin, batch-to-batch variation, high cost, and safety issues. Here, we demonstrate that gastrointestinal tissue-derived extracellular matrix hydrogels are suitable substitutes for Matrigel in gastrointestinal organoid culture. We found that the develop

Abstract Nature has developed materials that are integrated and effective at controlling their properties of adhesiveness and cohesiveness; the chemistry of these materials has been optimized during evolution. For example, a catechol moiety found in the adhesive proteins of marine mussels regulates its properties between adhesion and cohesion, rapidly adapting to environmental conditions. However, in synthetic materials chemistry, introduced chemical moieties are usually monofunctional, either b

Here we show that BMCs have the potential to regenerate vascular tissues and improve patency in tissue-engineered small-diameter vascular grafts. This is the first report of a small-diameter neovessel engineered with BMCs as a cell source.

This study demonstrates that hESC-EC transplantation improves blood perfusion and limb salvage by facilitating postnatal neovascularization in a mouse model of hindlimb ischemia. Thus, hESC-ECs might be useful as an alternative cell source for angiogenic therapy.

Abstract Hydrogels have been applied to improve stem cell therapy and drug delivery, but current hydrogel‐based delivery methods are inefficient in clinical settings due to difficulty in handling and treatment processes, and low off‐the‐shelf availability. To overcome these limitations, an adhesive hyaluronic acid (HA) hydrogel patch is developed that acts as a ready‐to‐use tissue tape for therapeutic application. The HA hydrogel patches functionalized with phenolic moieties (e.g., catechol, pyr

Abstract Exploitation of unique biochemical and biophysical properties of marine organisms has led to the development of functional biomaterials for various biomedical applications. Recently, ascidians have received great attention, owing to their extraordinary properties such as strong underwater adhesion and rapid self‐regeneration. Specific polypeptides containing 3,4,5‐trihydroxyphenylalanine (TOPA) in the blood cells of ascidians are associated with such intrinsic properties generated throu

Serotonin-conjugated hyaluronic acid hydrogel inspired by platelet coagulation provides a multifunctional hemostatic adhesive mediating highly effective hemostasis and preventing abnormal tissue adhesion.

Exoskeletons of insects formed by sclerotization processes exhibit superstrong properties in moduli. Here, it is demonstrated that mimicking the sclerotization process using phenol and polyamine molecules unexpectedly results in a 100% ecofriendly, biocompatible waterborne superglue. Oxygen presented in air and dissolved in water acts as an initiator producing phenolic radical/quinone for superglue curing. Despite synthesis-free uses of water, phenol, and polyamine, its adhesion strength is comp