体外日本血吸虫卵肉芽肿反应动力学的进一步观察

FURTHER OBSERVATION ON DYNAMICS OF IN VITRO GRANULOMATOUS RESPONSES SURROUNDING SCHISTOSOME EGGS

目的 进一步观察体外日本血吸虫卵肉芽肿反应模型的形态变化及反应强度与脾细胞供鼠感染阶段的关系。方法 取日本血吸虫感染后不同阶段的小鼠脾细胞在体外培养,在培养系统中定量加入日本血吸虫干卵后,对围绕虫卵的脾细胞反应进行形态学观察和计数。结果 感染鼠脾细胞出现显著的围绕虫卵的黏附反应,黏附细胞最初以粒细胞为主,很快被巨噬细胞所替代,周围有淋巴细胞的增生反应,以后出现成纤维细胞;加卵培养后感染鼠脾细胞的肉芽肿反应指数高于对照组(P<0.01或<0.05);感染后7—20周的感染组小鼠脾细胞对虫卵的反应指数也均高于对照组(P均<0.01)。结论 体外肉芽肿反应具有较好的敏感性和稳定性,可作为研究肉芽肿性炎症反应发生机制的有效手段。

Objective To further observe the morphologic changes of in vitro model of granulomatous responses around Schistosoma japonica eggs and determine the relationship of reaction inten-suy to infection stage of those schistosome-infected mice from which the splenocytes were obtained for in vitro experiments.Methods The spleen cells isolated from schistosome-infected mice were incubated and dry schistosome eggs were added into those cultures. These splenocytes responses surrounding eggs were observed and counted under the microscope.Results The splenocytes from infected mice showed obvious adherent responses to the dry eggs. Adhering cells were,at first,granulocytes,then replaced by the macrophages. Around the eggs proliferating lymphocytes,later fibroblasts, were found. The reaction index (RI) of the spleen cells from infected mice were significantly higher (P<0.01 or <0.05) than that from unexposed control mice during incubation period of 2 to 10 days after adding the dry eggs to the splenocytes cultures. The RI of the spleen cells from mice of post-infection 7 to 20 weeks were also significantly higher (P<0.01) than that from the control. Conclusion The in vitro granuloma reaction possesses in sensitivity and stability and the model may become the useful tool for elucidating mechanisms of granulomatous inflammation.