近年来已有许多报道,证明未致敏机体的淋巴细胞,对同系、同种异体、异种肿瘤靶细胞,病毒感染的细胞及体外长期培养的正常细胞株等具有自然杀伤功能。这现象引起了免疫学界的极度重视和广泛兴趣,因为它不仅与同种异体骨髓移植的排斥和自身免疫现象有关,而且也涉及抗病毒感染和防御肿瘤的免疫监视。行使这自然杀伤功能的效应者称NK细胞。国外对这细胞群已进行了大量的研究。 In recent years, there have been many reports that lymphocytes that are not sensitized have natural killer functions against homologous, allogeneic, xenogeneic tumor target cells, virus-infected cells and normal long-term cultured normal cell lines. This phenomenon has drawn great attention and widespread interest from the immunological community as it relates not only to the rejection and autoimmune phenomena of allogeneic bone marrow transplantation but also to the immunological surveillance of antiviral and defensive tumors. NK cells are used to exercise this natural killer effect. A large number of studies have been conducted abroad on this cell population.