TSH受体活性片段反义肽的免疫调节作用

Immune regulation of antisense peptides of thyrotropin receptor activity fragments

目的通过观察TSH受体(TSHR)活性片段及其反义肽(RHST)对大鼠免疫活性的影响,探讨反义肽的免疫调节作用。方法TSHR片段TR1、TR2、TR3及相应的反义肽RT1、RT2、RT3,或3对互补肽被分别注入不同组大鼠体内,观察免疫前后各组大鼠血清中TT3、TT4、TSH受体抗体(TRAb)、甲状腺刺激型抗体、甲状腺刺激抑制型抗体和TSH抗体(TSHAb)等指标以及甲状腺组织的病理变化。结果3条TSHR片段均刺激TRAb的产生;RT1和RT2可同时诱导出TRAb和TSHAb;TR2引发的甲状腺上皮细胞增生和淋巴细胞浸润可因RT2的注入而缓解。结论实验证明,3条TSHR片段均具有免疫源性;RT1和RT2具有免疫调节作用,可能是TSHR片段的独特型;反义肽可减轻由天然肽引发的体液和细胞免疫,证明了反义肽通过免疫网络进行免疫调节的可能性。

Objective To study the immune regulation of antisense peptide in rats by observing immune function of activity fragments of thyrotropin receptor (TSHR) and their corresponding antisense peptides. Methods TSHR peptides TR1, TR2, TR3 and their antisense peptides RT1, RT2, RT3, and three pairs of complementary peptides were injected into rats of different groups respectively, and the serum levels of TT_3, TT_4, TSHR antibody (TRAb), thyroid stimmulating antibody, thyroid blocking antibody and TSH antibody (TSHAb) and pathological changes in thyroid tissue were investigated. Results Serum TRAb could be induced when each of three fragments of TSHR was injected into rats; TRAb and TSHAb were induced by RT1 or RT2; epithelial hyperplasia and lymphocytic infiltration observed in thyroid tissue of rats injected with TR2 could be abated by injecting RT2 subsequently. Conclusion The results suggest that all 3 TSHR fragments are shown to be immunogenic and are capable to induce TRAb; both RT1 and RT2 show their effect on immune regulation and are idiotypic of TSHR peptides; On the other hand, the humoural and cell immunities are ameliarated by injection of antisense peptides. Therefore, it is possible that antisense peptides may be involved in immune regulation via immune network.