目的：研究桑白皮化学拆分组分的免疫调节作用，初步阐释桑白皮发挥免疫调节作用的有效部位。方法：采用碳廓清试验、血清溶血素试验、E-花环试验和淋巴细胞转化试验，考察桑白皮各化学拆分组分对正常小鼠免疫器官、非特异性免疫、体液免疫和细胞免疫的影响。结果：在碳廓清试验中，50%乙醇组分能够降低胸腺系数（P<0.01）和校正吞噬指数α（P<0.05）；在溶血素试验中，30%乙醇组分和脂肪油组分能够提高半数溶血值（HC50）（P<0.05）；在E-花环试验中，30%乙醇组分能够提高花环形成率（P<0.05）；在淋巴细胞转化试验中，30%乙醇组分能够促进体外胸腺和脾淋巴细胞的增殖（P<0.05或P<0.01），而50%乙醇组分则抑制其增殖（P<0.05或P<0.01）。结论：30%乙醇组分对体液免疫和细胞免疫都有促进作用；50%乙醇组分能够抑制胸腺的生长，对非特异性免疫和细胞免疫具有抑制作用；脂肪油组分能够促进体液免疫。

This article was aimed to study immunomodulatory effect of chemical split fractions of Mori Cortex, in order to initially explain effective parts that played a role in immunomodulatory effect of Mori Cortex. The carbon clearance test, serum hemolysin test, E-rosette test, and lymphocyte transformation test were carried out to explore influence of these chemical split fractions of Mori Cortex on immune organs, nonspecific immunity, humoral immunity and cellular immunity. The results showed that in the carbon clearance test, 50% ethanol fraction markedly reduced the thymus index (P<0.01) and the correction index α (P<0.05). In hemolysin test, the half value hemolysis (HC50) was improved by 30% ethanol fraction and fatty oil fraction (P<0.05). Besides, in the E-rosette test, the E-rosette ration was increased in the 30% ethanol fraction group (P<0.05). In the lymphocyte transformation test, the 30% ethanol fraction can promote the thymus and spleen lymphocytes proliferation (P<0.05 or P<0.01), while the 50% ethanol fraction inhibited the proliferation (P<0.05 or P<0.01). It was concluded that the 30% ethanol fraction can boost both the humoral immunity and cellular immunity; the 50% ethanol fraction can induce the growth of thymus with a suppressive effect on nonspecific immunity and cellular immunity; the fatty oil fraction can improve humoral immunity.

科学技术部国家重点基础研究发展计划“973计划”项目（2013CB531802）：宣泻利水中药的药性研究，负责人：郑晓珂。