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Japanese scientists have succeeded in using polymer materials instead of non-toxic viruses as carriers for gene therapy experiments, which may help to improve the efficacy and safety of treatment. Researchers at the National Center for Circulatory Diseases Research at the University of Japan, Ms. Shi, said that most gene therapy uses non-toxic influenza virus as a vector, genetically treating disease-causing genes into certain cells through genetic manipulation, and then injecting them into lesions. To kill germs. The disadvantage of this method is that it is very difficult to accurately send the disease-causing gene to the lesion, so that it is necessary to inject a large amount of drugs, and there is a danger of causing side effects. For security reasons, medical experts around the world are vigorously developing vectors that do not use viruses. Miso Shiba and Tokyo University professor Kataoka Co., Ltd. jointly developed a polymer carrier, which is a chain composed of polyethylene glycol, a raw material for cosmetics, and polylysine, a natural food preservative. The length is 20 to 30 nm. Non-toxic viruses are roughly equivalent. The results of animal experiments show that the use of this carrier improves the safety of the drug. Since polylysine is positively charged, it is easily adsorbed by negatively charged DNA, and it is not easily decomposed, so it is more suitable for treating liver diseases. Japanese scientists plan to advance this treatment to clinical trials two or three years later.