Effects of inorganic iron and myoglobin on in vitro proximal tubular lipid peroxidation and cytotoxicity.

Effects of inorganic iron and myoglobin on in vitro proximal tubular lipid peroxidation and cytotoxicity.
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无机铁和肌红蛋白对体外近端肾小管脂质过氧化和细胞毒性的影响。

DOI:
10.1172/jci115682
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发表时间:
1992
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Foerder,CA
Foerder,CA
中科院分区:
--
文献类型:
--
作者:
Zager,RA;Foerder,CA

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最近的体内研究表明,血红素 Fe 会引起近端肾小管脂质过氧化和细胞毒性,从而导致肌红蛋白尿(Mgb)急性肾衰竭的发病机制。由于羟自由基 (.OH) 清除剂 [二甲基硫脲 (DMTU)、苯甲酸盐、甘露醇] 可以减轻这种损伤,因此推测 .OH 是 Mgb 诱导的肾损伤的介质。本研究使用离体大鼠近端肾小管段(PTS)系统测试了这些假设。当将 Fe2+/Fe3+ 的等量混合物(总共 4 mM)添加到 PTS 中时,会引起显着的细胞毒性 [根据乳酸脱氢酶 (LDH) 释放来定义] 和脂质过氧化 [根据丙二醛 (MDA) 增量来评估]。单独的 Fe2+ 或 Fe3+ 均会引起 MDA 大幅升高,但只有 Fe2+ 会引起细胞毒性。尽管 DMTU 和苯甲酸盐在 Fe2+/Fe3+ 挑战期间均减少了 LDH 释放,但甘露醇和 GSH 却没有,尽管 .OH 相应减少(通过水杨酸盐捕获法测定)。 GSH 和过氧化氢酶(但不是 DMTU、苯甲酸盐或甘露醇)降低了 MDA 浓度,表明 Fe 驱动的脂质过氧化作用比 .OH 更依赖于 H2O2。去铁胺完全阻断 Fe 诱导的 LDH 释放,即使在它导致 .OH 生成明显增加的条件下也是如此。矛盾的是,Mgb 可以防止 Fe 介导的 PTS 损伤,这种作用主要由白蛋白复制。总之,这些数据表明:(a) Fe 可通过非 .OH 依赖性机制引起 PTS 脂质过氧化和细胞毒性; (b) Fe 介导的细胞毒性和脂质过氧化没有必然联系; (c) Mgb 反常地保护 PTS 免受 Fe 介导的损伤,这表明: (i) Mgb Fe 在发挥毒性之前可能需要从其卟啉环中释放出来; (ii) 蛋白质残留物可能会减轻所造成的损伤。
Recent in vivo studies suggest that heme Fe causes proximal tubular lipid peroxidation and cytotoxicity, thereby contributing to the pathogenesis of myoglobinuric (Mgb) acute renal failure. Because hydroxyl radical (.OH) scavengers [dimethylthiourea (DMTU), benzoate, mannitol] can mitigate this injury, it is postulated that .OH is a mediator of Mgb-induced renal damage. The present study has tested these hypotheses using an isolated rat proximal tubular segment (PTS) system. An equal mixture of Fe2+/Fe3+ (4 mM total), when added to PTS, caused marked cytotoxicity [as defined by lactate dehydrogenase (LDH) release] and lipid peroxidation [assessed by malondialdehyde (MDA) increments]. Fe2+ or Fe3+ alone each induced massive MDA elevations, but only Fe2+ caused cytotoxicity. Although both DMTU and benzoate decreased LDH release during the Fe2+/Fe3+ challenge, mannitol and GSH did not, despite equivalent reductions in .OH (gauged by the salicylate trap method). GSH and catalase (but not DMTU, benzoate, or mannitol) decreased MDA concentrations, suggesting the Fe-driven lipid peroxidation was more H2O2 than .OH dependent. Deferoxamine totally blocked Fe-induced LDH release, even under conditions in which it caused an apparent increase in .OH generation. Mgb paradoxically protected against Fe-mediated PTS injury, an effect largely reproduced by albumin. In conclusion, these data suggest that: (a) Fe can cause PTS lipid peroxidation and cytotoxicity by a non-.OH-dependent mechanism; (b) Fe-mediated cytotoxicity and lipid peroxidation are not necessarily linked; and (c) Mgb paradoxically protects PTS against Fe-mediated injury, suggesting that: (i) Mgb Fe may require liberation from its porphyrin ring before exerting toxicity; and (ii) the protein residue may blunt the resulting injury.
DOI: 10.1016/s0021-9258(19)47178-0
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影响因子: --
作者:
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DOI: 10.1172/jci113224
发表时间: 1987-11-01
影响因子: 15.9
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WEINBERG, JM;DAVIS, JA;RAJAN, T
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DOI: 10.1152/ajprenal.1988.255.3.f539
发表时间: 1988-09-01
影响因子: --
作者:
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发表时间: 1963
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DOI: 10.1152/ajprenal.1988.254.4.f574
发表时间: 1988
期刊: The American journal of physiology
影响因子: --
作者:
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