Synthetic oligodeoxynucleotides inhibit IgE induction in human lymphocytes.

Synthetic oligodeoxynucleotides inhibit IgE induction in human lymphocytes.
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合成寡脱氧核苷酸可抑制人淋巴细胞中 IgE 的诱导。

DOI:
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发表时间:
2000
影响因子:
24.7
通讯作者:
H. Saito
H. Saito
中科院分区:
医学1区
文献类型:
--
作者:
S. Fujieda;S. Iho;Y. Kimura;H. Yamamoto;H. Igawa;H. Saito

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合成的含有未甲基化的CpG基序的寡核苷酸(ODN)能够刺激小鼠的辅助性T细胞(Th)1型反应。Th1细胞因子被认为是免疫球蛋白E产生的下调因子。在本研究中,我们观察了人工合成的ODN在体外能否抑制IL-4加抗CD40单抗刺激的正常人外周血单核细胞(PBMC)中IgE的产生。从编码牛分枝杆菌卡介苗MPB-70基因的互补DNA中随机选取30个单链寡核苷酸。两个含有CGTACG或AACGTT的ODN可抑制人PBMC产生IgE。当含有CGTACG的ODN中的核心或侧翼寡核苷酸的一部分被其他寡核苷酸取代时,含有NACGTTCG或A/CTCGTTCG序列的ODN在体外特异性地抑制人PBMC产生IgE。某些ODN对IgE产生的抑制作用是由干扰素-γ和IL-12共同介导的,因为这种抑制作用可被抗-干扰素-γ或抗-IL-12单抗阻断。此外,ODN还抑制了IL-4对epsilon生殖系转录的诱导。我们的发现表明,合成的ODN似乎是治疗人类IgE依赖型过敏性疾病的候选药物。
Synthetic oligodeoxynucleotides (ODNs) containing unmethylated CpG motifs have the capacity to stimulate T-helper (Th)1-type responses in mice. Th1 cytokines are known to act as downregulators of IgE production. In this study we investigated whether synthetic ODNs inhibited IgE production in human peripheral blood mononuclear cells (PBMC) from normal donors stimulated with interleukin (IL)-4 plus anti-CD40 monoclonal antibody (mAb) in vitro. Thirty-mer single-stranded ODNs were randomly selected from the complementary DNA encoding the MPB-70 of Mycobacterium bovis Bacillus Calmette-Guerin. Two ODNs, containing CGTACG or AACGTT inhibited IgE production by human PBMC. When other oligonucleotides were substituted in a portion of the sequence of the core or flanking oligonucleotides in the ODN containing CGTACG, ODNs containing NACGTTCG or A/CTCGTTCG sequences specifically inhibited IgE production by human PBMC in vitro. The inhibition of IgE production by certain ODNs was mediated by both interferon (IFN)-gamma and IL-12, since the ODN-induced suppression was blocked by the addition of anti-IFN-gamma or anti-IL-12 mAb. Also, the ODNs inhibited induction of epsilon germline transcripts by IL-4. Our findings indicate that synthetic ODNs appear to be candidates for the treatment of IgE-dependent allergic disease in humans.
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