Vitamin d-directed rheostatic regulation of monocyte antibacterial responses.

Vitamin d-directed rheostatic regulation of monocyte antibacterial responses.
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维生素 D 介导的单核细胞抗菌反应的变阻调节。

DOI:
10.4049/jimmunol.0803736
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发表时间:
2009-04-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Hewison M
Hewison M
中科院分区:
其他
文献类型:
--
作者:
Adams JS;Ren S;Liu PT;Chun RF;Lagishetty V;Gombart AF;Borregaard N;Modlin RL;Hewison M

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维生素D的活性形式1,25-二羟基维生素D(1,25(OH)2D)通过诱导中草药抗菌肽(HCAP)增强天然免疫功能。在单核/巨噬细胞中,这主要发生在Toll样受体(TLR)的激活反应中,TLR诱导维生素D受体的表达,并由前体25-羟基维生素D3(25OHD)局部合成1,25(OH)2D。为了阐明维生素D和先天免疫之间的关系,我们评估了在骨科诊所就诊的受试者(n=50)体内和体外HCAP表达的变化。其中,38%的人维生素D不足(&lt;75 NM 25OHD),并接受维生素D补充(每周两次,共5周,50000国际单位维生素D2)。基线25OHD状态或补充维生素D对循环HCAP水平没有影响。因此,使用10%自体血清培养的外周血单核细胞来评估每个受试者的HCAP的体外变化(n=28)。在这些维生素D“不足”的条件下,TLR2/1配体19 kDa脂肽(19 KDa)或TLR4配体脂多糖,单核细胞显示维生素D激活酶CYP27b1的表达增加(分别为5倍和5.5倍,均P<0.001),但HcapmRNA的表达(分别为10倍和30倍,均P<0.001)。在19 kDa处理后,HCAP的表达:1)与血清培养补充剂中的25OHD水平相关(R=0.649,p&lt;0.001);2)外源性25OHD(5 NM)显著增强;3)补充体内维生素D的患者血清显著增强。这些数据表明,维生素D在先天性免疫中的一个关键作用是在单核细胞TLR激活后维持局部抗菌HCAP的产生。
The active form of vitamin D, 1,25-dihydroxyvitamin D (1,25(OH)2D) enhances innate immunity by inducing the cathelicidin antimicrobial peptide (hCAP). In monocytes/macrophages, this occurs primarily in response to activation of toll-like receptors (TLR), that induce expression of the vitamin D receptor and localized synthesis of 1,25(OH)2D from precursor 25-hydroxyvitamin D3 (25OHD). To clarify the relationship between vitamin D and innate immunity, we assessed changes in hCAP expression in vivo and ex vivo in human subjects attending a bone clinic (n=50). Of these, 38% were vitamin D-insufficient (<75 nM 25OHD) and received supplementation with vitamin D (50,000 IU vitamin D2 twice weekly for 5 weeks). Baseline 25OHD status or vitamin D supplementation had no effect on circulating levels of hCAP. Therefore, ex vivo changes in hCAP for each subject were assessed using peripheral blood monocytes cultured with 10% autologous serum (n=28). Under these vitamin D ‘insufficient’ conditions the TLR2/1 ligand 19 kDa lipopeptide (19 kDa) or the TLR4 ligand lipopolysaccharide, monocytes showed increased expression of the vitamin D-activating enzyme CYP27b1 (5- and 5.5-fold respectively, both p<0.01) but decreased expression of hCAP mRNA (10-fold and 30-fold, both p<0.001). Following treatment with 19 kDa, expression of hCAP: 1) correlated with 25OHD levels in serum culture supplements (R=0.649, p<0.001); 2) was significantly enhanced by exogenous 25OHD (5 nM); 3) was significantly enhanced with serum from vivo vitamin D-supplemented patients. These data suggest that a key role of vitamin D in innate immunity is to maintain localized production of antibacterial hCAP following TLR activation of monocytes.
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发表时间: 2007-12-01
影响因子: 6.2
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影响因子: 56.9
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DOI: 10.1164/rccm.200701-007oc
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