摘要
目的探讨变应性鼻炎免疫治疗的新方法。方法构建细胞毒性T淋巴细胞相关抗原4(cytotoxic T lymphocyteassoc iated antigen4,CTLA4)胞外区蛋白的酵母表达系统,以获取具有生物学活性的CTLA4胞外区蛋白;采用卵清蛋白(ovalbumin,OVA)致敏和激发诱导小鼠变应性鼻炎。CTLA4胞外区蛋白组在每次激发前予以CTLA4胞外区蛋白200μg/只腹腔注射,观察小鼠变应性鼻炎相关症状和鼻黏膜形态学改变。结果通过CTLA4胞外区蛋白的酵母表达系统可获得相对分子质量为28000、经蛋白免疫印迹(Westernblot)鉴定的CTLA4胞外区蛋白。该纯化蛋白能显著抑制混合淋巴细胞反应中T细胞的增殖,抑制率为95.4%。变应性鼻炎组小鼠在OVA激发后出现流涕、喷嚏等症状;鼻黏膜出现组织水肿、充血、炎性细胞渗出等形态学改变。CTLA4胞外区蛋白组小鼠鼻部症状不明显,鼻黏膜无明显形态学改变。结论CTLA4胞外区蛋白可阻断小鼠变应性鼻炎的发生,其作用机理可能与其抑制T细胞活化有关。
Objective To explore a new immunotherapy against allergic rhinitis. Methods The recombinant protein of CTLA4 extracellular domain was obtained through construction of CTLA4-yeast expression system. The allergic rhinitis in mice was induced by sensitizing and challenging with ovalbumin （OVA）. The allergic rhinitis related symptoms and the morphological changes in nasal mucosa were compared between the allergic rhinitis group and the CTLA4 extracellular domain group treated with CTLA4 extracellular domain before each challenge by ways of intraperitoneal injection. Results CTLA4 extracellular domain with a molecular weight of 28 000, which was confirmed by Western blot, could be generated through CTLA4-yeast expression system. The purified CTLA4 extracellular domain could inhibit T cells proliferation in mixed lymphocyte reaction with a inhibitory rate of 95.4%. The mice in allergic rhinitis group appeared typical allergic rhinitis symptoms after OVA challenge, such as rhinorrhea and sneeze. Meanwhile the nasal pathological studies showed edema and congestion in mucosa tissue and local influx of inflamatory cells. Whereas in CTLA4 extracellular domain group, the nasal symptoms were rarely observed, and the pathological change in nasal mucosa was significantly abated. Conclusions The protein of CTLA4 extracellular domain could prevent the allergic rhinitis in mice. The underlying mechanism of which might be the inhibition of the T cell activition.
出处
《中华耳鼻咽喉头颈外科杂志》
CAS
CSCD
北大核心
2005年第9期667-670,共4页
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
基金
国家自然科学基金资助项目(30200313)
