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机体对各种损伤—化学的、微生物的、免疫学的或其他方面而发动炎症反应的能力是哺乳动物作为保卫现象而获得的进化特征。炎症的程度是通过复杂的内环境稳定或末梢血淋巴细胞及其亚群的免疫调节机制而加以限制。只有当炎症反应超过共有用的目的时,才产生疾病。末梢血淋巴细胞包括三种类型:B细胞、T细胞和零细胞(null cells);衍生自胸腺的T淋巴细胞在内环境稳定中起着主要的作用。T淋巴细胞进一步可分为四种主要亚群:辅助性T细胞(T_H)、抑制性T细胞(T_S)、细胞毒性T细胞(T_C)和迟发型超敏感性T细胞(T_(DH))。
The ability of the body to respond to various injuries - chemical, microbiological, immunological, or otherwise, to initiate an inflammatory response is an evolutionary feature that mammals acquire as a safeguard. The degree of inflammation is limited by the complex mechanisms of regulation of the homeostasis or of peripheral blood lymphocytes and their subsets. Only when the inflammatory response exceeds the common purpose, then the disease. There are three types of peripheral blood lymphocytes: B cells, T cells, and null cells; T lymphocytes derived from the thymus play a major role in the homeostasis. T lymphocytes can be further divided into four major subgroups: T helper T, T S, T_C and T_ (DH) .