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Creators/Authors contains: "Li, Wuwei"

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  1. Abstract

    Gelatin, as a common hemostatic agent, has been processed into a variety of forms for clinical applications. To enhance wound healing and reduce postoperative complications after liver trauma or surgery, naturally‐derived materials can be incorporated into gelatin to improve its physical and biological properties. In this study, we developed an extracellular matrix (ECM) enriched gelatin (EG) sponge through combining liver ECM digestion and gelatin at different proportions. By increasing the gelatin concentration, the EG sponge exhibited reduced porous structure, lower water absorption rate, superior degradation resistant, and higher elastic modulus, whereas, by increasing the ECM concentration, the porous structure and swelling ratio of the EG sponge were significantly improved. We tested the in vivo response of EG sponge for liver parenchyma wound repair as compared with the ECM‐only or gelatin‐only sponges. Liver wound repaired with the gelatin‐only sponge exhibited a severe inflammation and tissue adhesion. In contrast, both ECM‐only and EG sponges repaired liver wound showed desired biocompatibility as evidenced by a smooth liver surface, reduced wound size, earlier material absorption, and accelerated liver regeneration. In conclusion, the properly designed EG sponge is a more effective and safer topical hemostatic agent than the traditional gelatin sponge for repairing liver injury.

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  2. Abstract

    Bone marrow derived mesenchymal stem cells (BM‐MSC) is a promising alternative cell source to primary hepatocytes because of their ability to differentiate into hepatocyte‐like cells. However, their inability to differentiate efficiently and potential to turn into myofibroblasts restrict their applications. This study developed a plate coating from the liver extracellular matrix (ECM) and investigated its ability in facilitating the BM‐MSCs proliferation, hepatic differentiation, and hepatocyte‐specific functions duringin vitroculture. After 28‐day culture, BM‐MSCs on the ECM coating showed hepatocyte‐like morphology, and certain cells took up low‐density lipoprotein. Synthesis of albumin, urea, and anti‐alpha‐fetoprotein, as well as expression of certain hepatic markers, in cells cultured on ECM were higher than cells cultured on non‐coated and Matrigelcoated plates. mRNA levels of CYP3A4, albumin, CK18, and CYP7A1 in cells on ECM coating were significantly higher than cells cultured on the non‐coating environment. In conclusion, viability and hepatogenic differentiation of BM‐MSCs cultured on both Matrigel and ECM coating were significantly enhanced compared with those cultured on non‐coated plates. Moreover, the liver ECM coating induced additional metabolic functions relative to the Matrigel coating. The liver ECM hydrogel preserves the natural composition, promotes simple gelling, induces efficient stem cell hepatogenic differentiation, and may have uses as an injectable intermedium for hepatocytes. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 829–838, 2018.

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