LITAF mediation of increased TNF-α secretion from inflamed colonic lamina propria macrophages.

LITAF mediation of increased TNF-α secretion from inflamed colonic lamina propria macrophages.
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LITAF 介导发炎的结肠固有层巨噬细胞 TNF-α 分泌增加。

DOI:
10.1371/journal.pone.0025849
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Amar S
Amar S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bushell KN;Leeman SE;Gillespie E;Gower AC;Reed KL;Stucchi AF;Becker JM;Amar S

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固有层巨噬细胞 (LPM) 中 TNF-α 的失调是炎症性肠病 (IBD) 的一个特征。 LPS 诱导的 TNF-α 因子 (LITAF) 是介导 TNF-α 表达的转录因子。为了确定LITAF是否参与介导急性炎症结肠组织中TNF-α表达,我们首先在C57BL/6小鼠中建立TNBS诱导的结肠炎症模型。从非炎症和炎症结肠组织中收获 LPM,并在体外测量炎症参数 TNF-α 和 LITAF mRNA 和蛋白质水平。与未治疗小鼠的 LPM 相比,经 TNBS 治疗的小鼠的 LPM 在基础状态下和对 LPS 的反应中分泌显着更多的 TNF-α (p<0.05)。与未治疗的动物相比,TNBS 的 LPM 中的 LITAF mRNA 和蛋白质水平升高,并且 LPS 进一步增加了发炎组织的 LPM 中的 LITAF 蛋白水平(P<0.05)。为了进一步证实 LITAF 在急性炎症结肠组织中的作用,在 LITAF 巨噬细胞特异性敲除小鼠 (LITAF mac -/- 小鼠) 中产生 TNBS 诱导的结肠炎症,并与野生型 (WT) C57BL/6 进行比较。 TNBS 给药后 24 小时,与 WT C57BL/6 小鼠相比,LITAF mac -/- 小鼠的结肠组织具有较低的 MPO 活性和减少的结肠 TNF-α mRNA(p<0.05)。从 LITAF mac -/- 收获的 LPM 响应 LPS 分泌的 TNF-α 明显少于野生型 (WT) C57BL/6 (p<0.05)。这项研究提供了证据,表明 LITAF 有助于调节急性炎症或 LPS 治疗后收集的 LPM 中的 TNF-α,为未来专注于 LITAF 抑制剂治疗 TNF-α 介导的炎症性疾病的工作铺平了道路。
Dysregulation of TNF-α in lamina propria macrophages (LPM) is a feature of inflammatory bowel diseases (IBD). LPS-Induced-TNF-Alpha-Factor (LITAF) is a transcription factor that mediates TNF-α expression. To determine whether LITAF participates in the mediation of TNF-α expression in acutely inflamed colonic tissues, we first established the TNBS-induced colonic inflammation model in C57BL/6 mice. LPM were harvested from non-inflamed and inflamed colonic tissue and inflammatory parameters TNF-α and LITAF mRNA and protein levels were measured ex-vivo. LPM from TNBS-treated mice secreted significantly more TNF-α at basal state and in response to LPS than LPM from untreated mice (p<0.05). LITAF mRNA and protein levels were elevated in LPM from TNBS compared with untreated animals and LPS further increased LITAF protein levels in LPM from inflamed tissue (P<0.05). To further confirm the role of LITAF in acutely inflamed colonic tissues, TNBS-induced colonic inflammation was produced in LITAF macrophage specific knockout mice (LITAF mac -/- mice) and compared to wild type (WT) C57BL/6. Twenty four hours following TNBS administration, colonic tissue from LITAF mac -/- mice had less MPO activity and reduced colonic TNF-α mRNA then WT C57BL/6 mice (p<0.05). LPM harvested from LITAF mac -/- secreted significantly less TNF-α in response to LPS than wild type (WT) C57BL/6 (p<0.05). This study provides evidence that LITAF contributes to the regulation of TNF-α in LPM harvested following acute inflammation or LPS treatment paving the way for future work focusing on LITAF inhibitors in the treatment of TNF-α-mediated inflammatory conditions.
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