The paper reviews the milestones and prerequisites in the history of the emergence and development of xenotransplantation. The currently existing barriers (immunological, infectious, genetic, ethical, and regulatory) to the development of this organ and tissue transplantation type have been studied. Available data on theoretical research and experimental studies have been reviewed. The prospects for performing xenotransplantation in various combination of species have been assessed. The forms and variants of the xenograft rejection reaction have been described. Genetic engineering approaches to overcoming xenoimmunological incompatibility are described. An assessment is made of ways to overcome existing barriers and prospects for the further development of xenotransplantation as a scientific section of transplantology.
Worldwide, there is a trend towards an increase in the number of patients waiting for liver transplantation, despite an increase in the total number of liver transplantation operations. Solving the problem of donor organ shortage is possible through the use of organs from marginal donors: organs removed after cardiac arrest, organs with a high percentage of steatosis, organs from donors over the age of 60 years. The main reason for refusing to use them is the risk of severe complications and an unfavorable outcome of the operation. Static cold preservation today is the main method of protecting donor organs from thermal damage, which possesses rather effective protective properties. At the same time, the duration of cold preservation has a limited time interval. There is always uncertainty about the viability of the organ. Modern methods for assessing donor organs such as donor history, laboratory data, visual examination and morphology, do not reliably predict liver function after transplantation. In this regard, the development of methods for preserving the organ after removing, which do not degrade the quality of the organ or even are capable of restoring the lost functions, is relevant. The machine perfusion of the liver is one of the new concepts aimed at solving this problem. The article highlights the international experience of using the machine perfusion of the donor liver over the past 15 years. Machine perfusion is a promising trend of transplantation development, which allows reducing the shortage of donor organs and improving their quality.
Моделирова ние иммунологической толерантности позволит отказаться от приема лекарственных средств для профилактики реакции отторжения донорского органа. В обзоре литературы освещаются иммунные механизмы отторжения аллотрансплантата и способы индукции толерантности. Обсуждаются роль мезенхимальных стволовых клеток и их применение для развития толерантности, авторы также обращают внимание на то, что переливание крови от донора органов приводит к снижению интенсивности иммунного ответа на донорские клетки при трансплантации.
Aim. To evaluate results of liver transplantation and ex situ liver resection and autotransplantation in patients with unresectable parasitic and tumor liver lesions. Matherial and methods. A total of 22 orthotopic liver transplants and 4 ex situ liver resection and autotransplantations were performed. Liver transplants performed in 10 cases of unresectable hepatocellular carcinoma, 8 cases of alveolar echinococcosis, 4 cases of hepatic epithelioid haemangioendothelioma. Ex situ liver resection and autotransplantation were performed in 3 cases of alveolar echinococcosis and in 1 case of cholangiocarcinoma. Results. Postoperative complication developed in 38,4% patients. Mortality rate was 19.2%. Patients with alveolar echinococcosis were most complicated group with 36,3% early mortality rate. Mortality in hepatocellular carcinoma group was 10%. There were no early mortality in haemangioendothelioma and cholangiocarcinoma patients. Median overall survival for hepatocelluler carcinoma, alveolar echinococcosis and hepatic epithelioid haemangioendothelioma groups was 48, 36, 20 months respectively. Patient after ex situ liver resection for cholangiocarcinoma alive for 24 months and still disease free. Conclusion. Liver transplantation and ex situ liver resection and autotransplantation is the only opportunity for radical treatment for unresectable alveolar echinococcosis and some oncological diseases of the organ. Patients with unresectable alveolar echinococcosis is a high risk group of postoperative complications due to initial poor physical status, long-time disease, chronically infections and parasitic invasion.
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