简述Ⅱ型干扰素的作用。
(1)激活巨噬细胞和NK细胞,增强机体抗感染和抗肿瘤作用。(2) 促进Thl细胞形成。增强细胞免疫功能。(3)促进抗原提呈细胞(Apc)表达NHC-I/Ⅱ类分子和共刺激分子,提高抗原提呈能力。(4)促进T细胞合成分泌IL -2和表述IL -2R。
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