Rα97-116(V108A)鼻粘膜耐受对实验性自身免疫性重症肌无力T-bet及GATA-3的影响
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摘要
目的:
     1.验证鼠源乙酰胆碱受体抗体α亚基97-116 (Rα97-116)肽段诱导建立实验性自身免疫性重症肌无力(EAMG)动物模型的可行性,为对重症肌无力(MG)进行进一步研究提供理想的实验动物模型。
     2.验证Rα97-116 (V108A)鼻粘膜耐受对EAMG治疗效果,探索鼻粘膜耐受治疗的临床应用价值。
     3.研究Th1、Th2细胞关键转录因子T-bet及GATA-3在正常组,模型组,耐受组中的表达变化规律,探究重症肌无力的发病机制及鼻粘膜耐受治疗理论依据。
     方法:
     将人工合成的鼠源肽段Rα97-116与完全氟氏佐剂(CFA)充分乳化混匀后多点皮下注入6-8周龄雌性Lewis大鼠,并在第30、60天强化注射与不完全氟氏佐剂(IFA)充分混合后的同等量肽段免疫制备EAMG大鼠模型。正常对照组则皮下注入等量的磷酸盐缓冲液(PBS)。通过称量实验大鼠体重,进行Lennon临床评分,低频重复神经电刺激(RNES)观察电衰减反应,ELISA法检测血清中AchR-Ab(IgG)滴度明确EAMG大鼠是否成模。将成模大鼠随机分为EAMG模型组、鼻粘膜耐受组,于第71-80天经双侧鼻腔分别滴注PBS液和含Rα97-116(V108A)肽段。耐受日起每日记录体重变化,隔日记录两组临床评分,至第95天结束观察。取外周血用RT-PCR检测PBMCs中T-betmRNA及GATA-3mRNA表达强度,ELISA测定血浆中IL-4、IFN-γ表达水平,AchR-Ab(IgG)含量。
     结果:
     1.造模Lewis大鼠中75%Lennon临床评分>1分,3Hz、5 Hz低频重复神经电刺激电衰减反应D5>10%,血浆中AchR-Ab IgG滴度与正常对照组血清比值>2.1。验证EAMG模型成模率达75%。
     2.经Rα97-116(V108A)鼻粘膜耐受治疗后第15天,耐受组大鼠体重较模型组鼠明显增加,差异具有统计学意义(P﹤0.05)。
     3.耐受治疗后第10天开始,耐受组、模型组两组平均Lennon临床评分分别为2.1±0.32和1.55±0.27(P<0.05)。
     4. Rα97-116(V108A)鼻粘膜耐受治疗后第25天,耐受组AchR-Ab IgG(0.98±0.15)含量明显下降,与模型组(1.29±0.18)比较有统计学意义(P﹤0.05)。
     5.模型组IL-4、IFN-γ的表达与正常组相比显著性增高(P<0.05);耐受组经Rα97-116(V108A)耐受治疗后,IL-4、IFN-γ表达水平虽与模型组相比显著降低(P<0.05),但仍较正常组略高(P>0.05)。
     6.模型组与正常组比较,T-bet和GATA-3 mRNA的表达显著增强(P<0.05);耐受组经Rα97-116(V108A)治疗后,T-bet和GATA-3 mRNA表达水平与EAMG模型组相比显著减弱(P<0.05)而与正常组相比较,差异无显著性(P>0.05)
     结论:
     1.人工合成鼠源肽段Rα97-116免疫Lewis大鼠可成功诱导EAMG动物模型,成模率约为75%。该实验动物模型为MG的基础研究提供简便易得的研究动物。
     2. Rα97-116(V108A)鼻粘膜耐受能明显改善EAMG大鼠的肌无力症状,为MG的治疗提供新途径。
     3. T-bet和GATA-3在MG的免疫发病机制中可能具有关键性的调控作用,鼻黏膜耐受治疗作用可能与其下调T-bet和GATA-3的表达,抑制异常Th1和Th2反应从而下调AChR特异性T和B细胞异常的免疫应答反应有关。
Objective:
     1. To verify the feasibility of rat-derived 97-116(Rα97-116) peptide of the acetylcholine receptor( AchR) a-subunit inducing experimental autoimmune myasthenia gravis(EAMG) ,in order to provide a simple and available animal models for futher study of myasthenia gravis (MG.).
     2. To verify the therapeutic efficacy of nasal tolerance with Rα97-116(V108A) on the EAMG and explore the clinical application value of nasal tolerance in MG.
     3. To explore the expression changes of T-bet and GATA-3 during normal control group,EAMG group,nasal tolerance group and the pathogenesis of MG as well as the theoretical basis of nasal tolerance .
     Methods:
     Female Lewis rats(6-8 weeks) were injected subcutaneously at four spots with the synthetic peptide Rα97-116 in complete Freund's adjuvant(CFA) and boosted on day 30 and 60 with the same peptide in incomplete Freund's adjuvant(IFA) to iduce rat models of EAMG , or only with phosphate buffer saline(PBS) in control group. Clinical manifestation was evaluated by measurement of body weight and Lennon clinical score. Disease was further confirmed by 3、5 Hz repetitive nerve stimulation (RNS) for positive decremental response and ELISA for sera AchR-Ab(IgG) titers. Modeling Lewis rats were divided into EAMG group and nasal tolerance group , and then PBS and Rα97-116(V108A) was respectively droped in bilasteral nasal cavity on days 71 to 80 once daily , Clinial Lennon score and body weight were evaluated for 24 days since nasal administration. All experiment rats were sacrificed on day 95. The expression levels of transcription factor T-bet/GATA-3mRNA in peripheral blood mononuclear cells(PBMCs) were measured by reverse transcription polymerase chain reaction(RT-PCR).IL-4、IFN-γ、AchR-Ab(IgG) in plasma were detected by ELISA.
     Results:
     1. Signs of EAMG occurred in 75% of Lewis rats ,which was confirmed by the Lennon clinical score>1 grade, the positive decremental response D5 >10% of 3、5 Hz RNS and the ratio >2.1 of the plasma AchR-Ab(IgG) titers to the normal control group. The achievement ratio of EAMG model was 75%.
     2. The 15th day after Lewis rats receiving nasal tolerance with Rα97-116(V108A) , the body weight of Lewis rats in the nasal tolerance group were increased significantly compared with the EAMG group(P﹤0.05).
     3. The 10th day after Lewis rats received nasal tolerance with Rα97-116(V108A), average clinical score of nasal tolerance group was significant better than EAMG group (P<0.05).
     4. Compared with the EAMG group , the amount of anti-AChR IgG in nasal tolerance group decreased (P<0.05) after the 25th day nasal tolerance with Rα97-116(V108A).
     5. The expression levels of IL-4 and IFN-γin EAMG group were much higher than those in normal control group (P<0.05);while IL-4 and IFN-γexpression were obviously decreased after nasal tolerance with Rα97-116(V108A) (P<0.05),there were not significant difference between nasal tolerance group and control group(P>0.05).
     6. The expression levels of T-bet/GATA-3 mRNA in EAMG group were much higher than those in control group (P<0.05);while T-bet/GATA-3 mRNA expression were obviously decreased after nasal tolerance with Rα97-116(V108A) (P<0.05),there were not significant difference between nasal tolerance group and control group (P>0.05).
     Conclusions:
     1. Immunization with the synthetic Rα97-116 peptide could induce EAMG in Lewis rats .The achievement ratio of EAMG model was 75% . This animal models provided a simple and available research materials for MG.
     2. Nasal tolerance with Rα97-116(V108A) could ameliorate muscular weakness and improve related Lab indexes of EAMG rats, which will provide a new way of treament for MG.
     3. T-bet and GATA-3 may play a critical role in pathogenesis of MG, nasal tolerance with Rα97-116(V108A) could surpress ongoing EAMG, which may be related to the decrease of T-bet/GATA-3 expression and downregulation of AChR-specific B-cell responses and AChR-reactive T-cell function.
引文
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