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1. 淋巴细胞归巢(lymphocyte homing):是指淋巴细胞的定向游动,包括淋巴干细胞向中枢淋巴器官归巢,成熟淋巴细胞向外周淋巴器官归巢,淋巴细胞再循环,以及淋巴细胞向炎症部位迁移。其分子基础是淋巴细胞归巢受体与内皮细胞上地址素之间的相互作用。 +n0y/0Au
2. 淋巴细胞归巢受体(lymphocyte homing receptor,LHR):是指存在于淋巴细胞表面的某些粘附分子,如:L-selectin, CLA, LFA-1, VLA-4, CD44, α4β7等。他们可以与血管内皮细胞上相应的地址素粘附分子相互作用,介导淋巴细胞的归巢。 A}%sF MA
3. 非特异性免疫(nonspecific immunity):又称固有免疫(innate immunity),是生物体在长期种系发育和进化过程中逐渐形成的一系列防卫机制。此免疫在个体出生时就具备,可对外来病原体迅速应答,产生非特异抗感染免疫作用,同时在特异性免疫应答过程中也起重要作用。 V7&