Effects of Lipopolysaccharide on the Induction of Mixed Chimerism in Cyclophosphamide‐Induced Tolerance

Effects of Lipopolysaccharide on the Induction of Mixed Chimerism in Cyclophosphamide‐Induced Tolerance
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脂多糖对环磷酰胺诱导的耐受性中混合嵌合体诱导的影响

DOI:
10.1111/j.1365-3083.2009.02314.x
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发表时间:
2009
影响因子:
3.7
通讯作者:
Ryuji Tominaga
Ryuji Tominaga
中科院分区:
医学4区
文献类型:
--
作者:
T. Onzuka;Y. Tomita;I. Shimizu;Shinji Okano;H. Yamada;Y. Yoshikai;Ryuji Tominaga

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环磷酰胺(CP)诱导的耐受是一种基于混合嵌合体的耐受,是用于诱导移植耐受的策略之一。据报道,Toll样受体(TLR)激动剂能够通过激活同种异体反应性T细胞或通过抑制Treg细胞来消除耐受性的诱导。然而,关于TLR介导的免疫应答对基于混合嵌合体的耐受方案的影响知之甚少。在这项研究中,我们评估了脂多糖(LPS),这是最有名的TLR 4激动剂,对CP诱导的耐受性的影响。BALB/c(H-2d)小鼠在第0天接受由108个供体DBA/2(H-2d)脾细胞(SC)和第2天200 mg/kg CP组成的预处理方案。 在第-2天、第0天、第7天或第35天注射单剂量20μg LPS。我们的研究结果表明,在任何时间点的LPS输注导致供体皮肤移植物的慢性排斥反应和33-60%的受体中混合嵌合体的消除。我们发现皮肤移植物的接受性和较高水平的混合嵌合体之间存在相关性。流式细胞术分析显示,无论LPS输注如何,供体反应性T细胞被永久消除。总之,LPS输注对供体反应性T细胞的免疫应答几乎没有影响,但对CP诱导的耐受中混合嵌合体的诱导和维持有显著影响。
Cyclophosphamide (CP)‐induced tolerance is a mixed chimerism‐based tolerance and is one of the strategies used to induce transplant tolerance. Toll‐like receptor (TLR) agonists are reportedly able to abrogate the induction of tolerance by activating alloreactive T cells, or by inhibiting Treg cells. However, little is known about the effect of the immune response mediated by TLR on mixed chimerism‐based tolerance protocols. In this study, we evaluated the influence of lipopolysaccharide (LPS), which is best known as an TLR4 agonist, on CP‐induced tolerance. BALB/c (H‐2d) mice received a conditioning regimen consisting of 108 donor DBA/2 (H‐2d) spleen cells (SC) on day 0 and 200 mg/kg CP on day 2. A single dose of 20 μg LPS was injected on day −2, 0, 7, or 35. Our results showed that LPS infusion at any time point resulted in chronic rejection of donor skin grafts and the abrogation of mixed chimerism in 33–60% of recipients. We found a correlation between skin graft acceptance and higher levels of mixed chimerism. Flow cytometric analysis revealed that donor‐reactive T cells were permanently eliminated, regardless of LPS infusion. In conclusion, LPS‐infusion had little influence on the immune response of donor‐reactive T cells, but had a significant effect on the induction and maintenance of mixed chimerism in CP‐induced tolerance.
DOI: 10.1172/jci17573
发表时间: 2003-05
期刊: The Journal of clinical investigation
影响因子: --
作者:
D. Goldstein;B. Tesar;S. Akira;Fadi G Lakkis
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发表时间: 2008-01-24
影响因子: 158.5
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通讯作者: Sachs, David H.
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DOI: --
发表时间: 1994
期刊: Journal of immunology (Baltimore, Md. : 1950)
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DOI: 10.1182/blood.v87.6.2337.bloodjournal8762337
发表时间: 1996-03-15
期刊: BLOOD
影响因子: 20.3
作者:
Jansen, PM;Pixley, RA;Colman, RW
通讯作者: Colman, RW
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DOI: 10.1006/viro.2000.0278
发表时间: 2000
期刊: Virology.
影响因子: --
作者:
Welsh,RM;McNally,JM;Brehm,MA;Selin,LK
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