Decellularized matrices in regenerative medicine.

Decellularized heart ECM hydrogel using supercritical carbon dioxide for improved angiogenesis.

Vascularization of three-dimensional engineered tissues for regenerative medicine applications.

The term "liver tissue engineering" summarizes one of the ultimate goals of modern biotechnology: the possibility of reproducing in total or in part the functions of the liver in order to treat acute or chronic liver disorders and, ultimately, create a fully functional organ to be transplanted or used as an extracorporeal device. All the technical approaches in the area of liver tissue engineering are based on allocating adult hepatocytes or stem cell-derived hepatocyte-like cells within a three-dimensional structure able to ensure their survival and to maintain their functional phenotype. The hosting structure can be a construct in which hepatocytes are embedded in alginate and/or gelatin or are seeded in a pre-arranged scaffold made with different types of biomaterials. According to a more advanced methodology termed three-dimensional bioprinting, hepatocytes are mixed with a bio-ink and the mixture is printed in different forms, such as tissue-like layers or spheroids. In the last decade, efforts to engineer a cell microenvironment recapitulating the dynamic native extracellular matrix have become increasingly successful, leading to the hope of satisfying the clinical demand for tissue (or organ) repair and replacement within a reasonable timeframe. Indeed, the preclinical work performed in recent years has shown promising results, and the advancement in the biotechnology of bioreactors, ex vivo perfusion machines, and cell expansion systems associated with a better understanding of liver development and the extracellular matrix microenvironment will facilitate and expedite the translation to technical applications. (Hepatology Communications 2018;2:131-141).

https://aasldpubs.onlinelibrary.wiley.com/doi/pdf/10.1002/hep4.1136

Liver tissue engineering: From implantable tissue to whole organ engineering

Transplantation is the only curative treatment option available for patients suffering from end-stage organ failure, improving their quality of life and long-term survival. However, because of organ scarcity, only a small number of these patients actually benefit from transplantation. Alternative treatment options are needed to address this problem. The technique of whole-organ decellularization and recellularization has attracted increasing attention in the last decade. Decellularization includes the removal of all cellular components from an organ, while simultaneously preserving the micro and macro anatomy of the extracellular matrix. These bioscaffolds are subsequently repopulated with patient-derived cells, thus constructing a personalized neo-organ and ideally eliminating the need for immunosuppression. However, crucial problems have not yet been satisfyingly addressed and remain to be resolved, such as organ and cell sources. In this review, we focus on the actual state of organ de- and recellularization, as well as the problems and future challenges.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/tri.13462

Strategies based on organ decellularization and recellularization

Bioengineered transplantable porcine livers with re-endothelialized vasculature

Transcranial Optogenetic Stimulation Promotes Corticospinal Tract Axon Regeneration to Repair Spinal Cord Injury by Activating the JAK2/STAT3 Pathway

A biocompatible gelatin sponge scaffold confers robust tissue remodeling after spinal cord injury in a non-human primate model.

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Bioengineered transplantable porcine livers with re-endothelialized vasculature

Transcranial Optogenetic Stimulation Promotes Corticospinal Tract Axon Regeneration to Repair Spinal Cord Injury by Activating the JAK2/STAT3 Pathway

A biocompatible gelatin sponge scaffold confers robust tissue remodeling after spinal cord injury in a non-human primate model.