Dose-response studies of methylated and nonmethylated CpG ODNs from Bifidobacterium longum subsp. infantis for optimizing Treg cell stimulation.

IF 2.6 3区 医学 Q2 ALLERGY
Dongmei Li, Idalia Cruz, Sharareh Sorkhabi, Patricia L Foley, Julie Wagner, Joseph A Bellanti
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引用次数: 0

Abstract

Background: Allergen immunotherapy (AIT) is the most effective treatment for atopic allergic diseases, aiming to induce regulatory T cells (Treg) that modify the immune response to specific allergens, which leads to long-term tolerance and reduced symptoms. Enhancing Treg activity is crucial for improving immunotherapy outcomes. In a previous murine model study, we examined the effects of a synthetic methylated DNA oligodeoxynucleotide (ODN) from the Bl-T2 m5C motif of Bifidobacterium longum subsp. infantis. The ODN that contains the methylated BI-T2 m5C motif (methylated ODNA) sequence conjugated with ovalbumin induced Treg production, whereas ODN that contains the unmethylated BI-T2 m5C motif (unmethylated ODNB) induced proinflammatory responses, which demonstrated the potential of methylated ODNs for AIT. Objective: In building on these results, this study explored the effects of methylated and nonmethylated DNA motifs from B. longum subsp. infantis on inflammation and Treg induction, while investigating the dose-response relationships of methylated Cytosine-phosphate-Guanine (CpG) ODNs for optimal Treg stimulation in clinical applications. Methods: Serum levels of IL-17A, IL-4, IL-10, and transforming growth factor beta (TGF-β) were measured by enzyme linked immunosorbent assay (ELISA), and flow cytometry assessed splenic Treg populations in BALB/c mice receiving graded doses of methylated or unmethylated ODNs. Mice were immunized intraperitoneally with a single 100-μg dose (plan A) or multiple 25 μg (plan B) or 100 μg (plan C) doses. Calf thymic DNA served as a positive control, with phosphate-buffered saline solution and alum as negative controls. Results: Methylated ODNs significantly increased CD25+FOXP3+ Tregs compared with unmethylated ODNs and controls. Plan A (100 μg) elevated serum IL-10, which indicated effective Treg induction, whereas plan B (four 25 μg doses) did not activate Tregs. Plan C (multiple 100 μg doses) reduced Treg responses, which highlighted a critical dosing threshold for optimal Treg induction. Conclusion: This study demonstrated the potential of methylated DNA motifs as therapeutic agents in AIT. The dose-response relationships of methylated CpG ODNs from B. longum pave the way for clinical applications that target Treg activity in allergic diseases.

长双歧杆菌甲基化和非甲基化CpG ODNs的剂量反应研究。优化婴儿Treg细胞刺激。
背景:过敏原免疫疗法(Allergen immunotherapy, AIT)是治疗特应性变态反应性疾病最有效的方法,旨在诱导调节性T细胞(regulatory T cells, Treg)改变对特定过敏原的免疫反应,从而导致长期耐受性和减轻症状。增强Treg活性对改善免疫治疗效果至关重要。在之前的一项小鼠模型研究中,我们检测了长双歧杆菌Bl-T2 m5C基序合成的甲基化DNA寡脱氧核苷酸(ODN)的影响。对象的。含有甲基化的BI-T2 m5C基序(甲基化的ODNA)序列与卵清蛋白结合的ODN诱导Treg产生,而含有未甲基化的BI-T2 m5C基序(未甲基化的ODNB)的ODN诱导促炎反应,这表明甲基化的ODN在AIT中的潜力。目的:在这些结果的基础上,本研究探讨了长芽孢杆菌亚种甲基化和非甲基化DNA基序的影响。同时研究甲基化胞嘧啶-磷酸-鸟嘌呤(CpG) ODNs的剂量-反应关系,以在临床应用中获得最佳的Treg刺激。方法:采用酶联免疫吸附法(ELISA)检测BALB/c小鼠血清IL-17A、IL-4、IL-10和转化生长因子β (TGF-β)水平,并用流式细胞术评估接受分级剂量甲基化或未甲基化odn的小鼠脾Treg群。小鼠腹腔注射单次100 μg剂量(a方案)或多次25 μg (B方案)或100 μg (C方案)免疫。小牛胸腺DNA作为阳性对照,磷酸盐缓冲盐水溶液和明矾作为阴性对照。结果:与未甲基化的ODNs和对照组相比,甲基化的ODNs显著增加CD25+FOXP3+ Tregs。方案A (100 μg)升高血清IL-10,表明Treg诱导有效,而方案B(4次25 μg剂量)未激活Treg。方案C(多次100 μg剂量)降低了Treg反应,这突出了最佳Treg诱导的临界剂量阈值。结论:本研究证明了甲基化DNA基序作为AIT治疗药物的潜力。长芽胞杆菌甲基化CpG ODNs的剂量-反应关系为靶向Treg活性在过敏性疾病中的临床应用铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.70
自引率
35.70%
发文量
106
审稿时长
6-12 weeks
期刊介绍: Allergy & Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists. The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma. Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.
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