Iron mediates production of a neutrophil chemoattractant by rat hepatocytes metabolizing ethanol.

Iron mediates production of a neutrophil chemoattractant by rat hepatocytes metabolizing ethanol.
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铁介导大鼠肝细胞代谢乙醇产生中性粒细胞趋化剂。

DOI:
10.1172/jci114999
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发表时间:
1991
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Roll,FJ
Roll,FJ
中科院分区:
--
文献类型:
--
作者:
Hultcrantz,R;Bissell,DM;Roll,FJ

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肝细胞中的乙醇代谢伴随着对中性粒细胞的强效脂质化学引诱剂的释放。该因子的产生可能引发与酒精性肝炎相关的炎症。在先前对肝脏细胞质溶胶系统的研究中,铁螯合剂以及过氧化氢酶和超氧化物歧化酶会阻断其产生,这表明氧自由基参与了化学引诱剂的形成。这些研究利用从喂食缺铁饮食、对照饮食或含有3%羰基铁饮食的大鼠身上提取的细胞,检验了铁在完整肝细胞中的作用。缺铁细胞的平均铁含量为1.4 nmol/mg蛋白质,对照组为6.3 nmol/mg,含铁细胞为135.3 nmol/mg。各组肝细胞原代培养,用乙醇(10 mM)孵育;测定了该培养基对人中性粒细胞的化学引诱活性。如先前报道的那样,从饲料喂养或含铁动物的培养物中产生化学引诱剂。相比之下,在缺铁培养中检测不到化学引诱剂的产生。添加柠檬酸铁(10微米)可以恢复化学引诱剂的产生,同时使缺乏的细胞中的细胞铁增加不到50%(达到2.3 nmol/mg蛋白质)。向含铁细胞中添加甲磺酸去铁胺可抑制化学引诱剂的产生。这些数据为肝细胞铁在这种与酒精相关的脂质化学引诱剂的产生中的重要性提供了证据,并表明一个小的细胞内“游离”铁池起着关键作用。
Ethanol metabolism in hepatocytes is accompanied by release of a potent lipid chemoattractant for neutrophils. Production of the factor may initiate the inflammation associated with alcoholic hepatitis. In previous studies with a cytosol system from liver, production was blocked by iron chelators as well as by catalase and superoxide dismutase, suggesting the involvement of oxyradicals in formation of the chemoattractant. These studies have examined the role of iron in intact hepatocytes using cells from rats fed an iron-deficient diet, a control diet or a diet containing 3% carbonyl iron. The iron content averaged 1.4 nmol/mg protein in iron-deficient cells, 6.3 in controls and 135.3 in iron-loaded cells. Hepatocytes from all groups were established in primary culture and incubated with ethanol (10 mM); the medium was assayed for chemoattractant activity for human neutrophils. Cultures from chow-fed or iron-loaded animals produced chemoattractant as previously reported. By contrast, chemoattractant production was undetectable in the iron-deficient cultures. Addition of ferric citrate (10 microM) restored chemoattractant production while increasing cellular iron in the deficient cells less than 50% (to 2.3 nmol/mg protein). Addition of desferrioxamine mesylate to cultures of iron-loaded cells ablated chemoattractant production. The data provide evidence for the importance of hepatocellular iron in production of this alcohol-related lipid chemoattractant and suggest that a small intracellular pool of "free" iron plays a critical role.
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DOI: --
发表时间: 1981
期刊: Progress in hematology
影响因子: --
作者:
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通讯作者: Kushner,JP
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发表时间: 1987
期刊: Laboratory investigation; a journal of technical methods and pathology
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发表时间: 2009
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DOI: 10.1016/s0021-9258(17)39218-9
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影响因子: --
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DOI: --
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影响因子: 4.1
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