Vitamin d-directed rheostatic regulation of monocyte antibacterial responses.
Vitamin d-directed rheostatic regulation of monocyte antibacterial responses.
复制标题
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:
影响因子:
--
通讯作者:
Hewison M
中科院分区:
文献类型:
--
作者:
Adams JS;Ren S;Liu PT;Chun RF;Lagishetty V;Gombart AF;Borregaard N;Modlin RL;Hewison M
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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影响因子:
6.2
作者:
Dawson-Hughes, Bess;Bischoff-Ferrari, Heike A.
通讯作者:
Bischoff-Ferrari, Heike A.
DOI:
10.1016/j.pbiomolbio.2006.02.003
发表时间:
2006-09-01
影响因子:
3.8
作者:
Vieth, Reinhold
通讯作者:
Vieth, Reinhold
影响因子:
4.8
作者:
Gombart, AF;Borregaard, N;Koeffler, HP
通讯作者:
Koeffler, HP
影响因子:
56.9
作者:
Liu, PT;Stenger, S;Modlin, RL
通讯作者:
Modlin, RL
DOI:
10.1164/rccm.200701-007oc
发表时间:
2007-07-15
影响因子:
24.7
作者:
Martineau, Adrian R.;Wilkinson, Robert J.;Griffiths, Christopher J.
通讯作者:
Griffiths, Christopher J.