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N6-methylated adenine on the target sites of mamA from Mycobacterium bovis BCG enhances macrophage activation by CpG DNA in mice
Tuberculosis ( IF 2.8 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.tube.2019.101890
Yumiko Tsukamoto 1 , Toshiki Tamura 1 , Yumi Maeda 1 , Kensuke Miyake 2 , Manabu Ato 1
Affiliation  

CpG motifs in DNA sequences are recognized by Toll-like receptor 9 and activate immune cells. Bacterial genomic DNA (gDNA) has modified cytosine bases (5-methylcytosine [5 mC]) and modified adenine bases (6-methyladenine [6 mA]). 5 mC inhibits immune activation by CpG DNA; however, it is unclear whether 6 mA inhibits immune activation by CpG DNA. Mycobacterium bovis BCG (BCG) has three adenine methyltransferases (MTases) that act on specific target sequences. In this study, we examined whether the 6 mA at the target sites of adenine MTases affected the immunostimulatory activity of CpG DNA. Our results showed that only 6 mA located at the target sequence of mamA, an adenine MTase from BCG, enhanced interleukin (IL)-12p40 production from murine bone marrow-derived macrophages (BMDMs) stimulated with CpG DNA. Enhancement of IL-12p40 production in BMDMs was also observed when BMDMs were stimulated with CpG DNA ligated to oligodeoxynucleotides (ODNs) harboring 6 mA. Accordingly, we then evaluated whether gDNA from adenine MTase-deficient BCG was less efficient with regard to stimulation of BMDMs. Indeed, gDNA from a mamA-deficient BCG had less ability to activate BMDMs than that from wild-type BCG. We concluded from these results that adenine methylation on ODNs and bacterial gDNA may enhance immune activity induced by CpG DNA.

中文翻译:

牛分枝杆菌 BCG mamA 靶位点上的 N6 甲基化腺嘌呤通过 CpG DNA 增强小鼠巨噬细胞活化

DNA 序列中的 CpG 基序被 Toll 样受体 9 识别并激活免疫细胞。细菌基因组 DNA (gDNA) 具有修饰的胞嘧啶碱基(5-甲基胞嘧啶 [5 mC])和修饰的腺嘌呤碱基(6-甲基腺嘌呤 [6 mA])。5 mC 通过 CpG DNA 抑制免疫激活;然而,尚不清楚 6 mA 是否抑制 CpG DNA 的免疫激活。牛分枝杆菌 BCG (BCG) 具有三种作用于特定靶序列的腺嘌呤甲基转移酶 (MTase)。在这项研究中,我们检查了腺嘌呤 MTases 靶位点的 6 mA 是否影响 CpG DNA 的免疫刺激活性。我们的结果表明,仅 6 mA 位于 MamA(一种来自 BCG 的腺嘌呤转移酶)的靶序列处,可增强 CpG DNA 刺激的鼠骨髓源性巨噬细胞 (BMDM) 产生的白细胞介素 (IL)-12p40。当 BMDM 被连接到含有 6 mA 的寡脱氧核苷酸 (ODN) 的 CpG DNA 刺激时,也观察到 BMDM 中 IL-12p40 产生的增强。因此,我们随后评估了来自腺嘌呤 MTase 缺陷型 BCG 的 gDNA 是否在刺激 BMDM 方面效率较低。事实上,来自缺乏 mama 的 BCG 的 gDNA 激活 BMDM 的能力低于来自野生型 BCG 的 gDNA。我们从这些结果得出结论,ODN 和细菌 gDNA 上的腺嘌呤甲基化可能会增强 CpG DNA 诱导的免疫活性。与野生型 BCG 相比,来自 mama 缺陷型 BCG 的 gDNA 激活 BMDM 的能力较低。我们从这些结果得出结论,ODN 和细菌 gDNA 上的腺嘌呤甲基化可能会增强 CpG DNA 诱导的免疫活性。与野生型 BCG 相比,来自 mama 缺陷型 BCG 的 gDNA 激活 BMDM 的能力较低。我们从这些结果得出结论,ODN 和细菌 gDNA 上的腺嘌呤甲基化可能会增强 CpG DNA 诱导的免疫活性。
更新日期:2020-03-01
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