Toll-like receptor 4-dependent Kupffer cell activation and liver injury in a novel mouse model of parenteral nutrition and intestinal injury

被引:144
作者
El Kasmi, Karim C. [2 ,5 ]
Anderson, Aimee L. [2 ,5 ]
Devereaux, Michael W. [2 ,5 ]
Fillon, Sophie A. [2 ,5 ]
Harris, J. Kirk [3 ,6 ]
Lovell, Mark A. [4 ]
Finegold, Milton J. [7 ,8 ]
Sokol, Ronald J. [1 ,2 ,5 ]
机构
[1] Childrens Hosp Colorado, Colorado Clin & Translat Sci Inst, Aurora, CO 80045 USA
[2] Univ Colorado, Sect Pediat Gastroenterol Hepatol & Nutr, Sch Med, Aurora, CO USA
[3] Univ Colorado, Sect Pulm Med, Sch Med, Dept Pediat, Aurora, CO USA
[4] Univ Colorado, Dept Pathol, Sch Med, Aurora, CO USA
[5] Childrens Hosp Colorado, Digest Hlth Inst, Aurora, CO 80045 USA
[6] Childrens Hosp Colorado, Breathing Inst, Aurora, CO 80045 USA
[7] Baylor Coll Med, Houston, TX 77030 USA
[8] Texas Childrens Hosp, Dept Pathol, Houston, TX 77030 USA
基金
美国国家卫生研究院;
关键词
INFLAMMATION; PERMEABILITY; ANTAGONIST; TIME;
D O I
10.1002/hep.25500
中图分类号
R57 [消化系及腹部疾病];
学科分类号
100201 [内科学];
摘要
Infants with intestinal failure who are parenteral nutrition (PN)-dependent may develop cholestatic liver injury and cirrhosis (PN-associated liver injury: PNALI). The pathogenesis of PNALI remains incompletely understood. We hypothesized that intestinal injury with increased intestinal permeability combined with administration of PN promotes lipopolysaccharide (LPS)Toll-like receptor 4 (TLR4) signaling dependent Kupffer cell (KC) activation as an early event in the pathogenesis of PNALI. We developed a mouse model in which intestinal injury and increased permeability were induced by oral treatment for 4 days with dextran sulphate sodium (DSS) followed by continuous infusion of soy lipid-based PN solution through a central venous catheter for 7 (PN7d/DSS) and 28 (PN28d/DSS) days. Purified KCs were probed for transcription of proinflammatory cytokines. PN7d/DSS mice showed increased intestinal permeability and elevated portal vein LPS levels, evidence of hepatocyte injury and cholestasis (serum aspartate aminotransferase, alanine aminotransferase, bile acids, total bilirubin), and increased KC expression of interleukin-6 (Il6), tumor necrosis factor a (Tnfa), and transforming growth factor beta (Tgf beta). Markers of liver injury remained elevated in PN28d/DSS mice associated with lobular inflammation, hepatocyte apoptosis, peliosis, and KC hypertrophy and hyperplasia. PN infusion without DSS pretreatment or DSS pretreatment alone did not result in liver injury or KC activation, even though portal vein LPS levels were elevated. Suppression of the intestinal microbiota with broad spectrum antibiotics or ablation of TLR4 signaling in Tlr4 mutant mice resulted in significantly reduced KC activation and markedly attenuated liver injury in PN7d/DSS mice. Conclusion: These data suggest that intestinal-derived LPS activates KC through TLR4 signaling in early stages of PNALI. (HEPATOLOGY 2012)
引用
收藏
页码:1518 / 1528
页数:11
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