High mobility group box 1 protein is methylated and transported to cytoplasm in clear cell renal cell carcinoma.

High mobility group box 1 protein is methylated and transported to cytoplasm in clear cell renal cell carcinoma.
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在透明细胞肾细胞癌中,高迁移率族蛋白 1 蛋白被甲基化并转运至细胞质。

DOI:
10.7314/apjcp.2013.14.10.5789
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发表时间:
2013-10
期刊:
Asian Pac J Cancer Prev
影响因子:
--
通讯作者:
Lu, Jia-Ju
Lu, Jia-Ju
中科院分区:
其他
文献类型:
--
作者:
Zhao, Zuo-Hui;Ding, Sen-Tai;Wu, Hai-Hu;Lu, Jia-Ju

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背景 高迁移率族蛋白1(HMGB 1)蛋白是一种广泛存在于大多数细胞类型的核蛋白。它通常位于细胞核中,在转录调控中作为核辅因子发挥作用。然而,HMGB 1也可以定位于细胞质中并释放到细胞外基质中,在那里它在致癌和炎症中起关键作用。然而,在肾透明细胞癌(ccRCC)中HMGB 1是否重新定位到细胞质中仍然是难以捉摸的。 方法 通过不同的方案从20个ccRCC样品和相应的邻近肾组织中提取核和胞质蛋白。Western blotting和免疫组化法检测肾细胞癌中HMGB 1的表达。为了阐明HMGB 1胞质易位的潜在机制,通过免疫沉淀富集HMGB 1蛋白并通过质谱(MS)分析。 结果 在ccRCC样品中HMGB 1蛋白过表达并且部分定位于细胞质中(12/20,60%,p<0.05)。免疫组化结果显示,高核分级的ccRCC中HMGB 1的迁移率高于低核分级的ccRCC(p<0.05)。生物信息学分析表明,HMGB 1在ccRCC中的甲基化修饰可能影响其与DNA的结合能力并介导其转位。 结论 在ccRCC中证实了HMGB 1向细胞质的重新定位。HMGB 1在赖氨酸112位的甲基化可能是该辅因子蛋白的再分布。
BACKGROUND The high mobility group box 1 (HMGB1) protein is a widespread nuclear protein present in most cell types. It typically locates in the nucleus and functions as a nuclear cofactor in transcription regulation. However, HMGB1 can also localize in the cytoplasm and be released into extracellular matrix, where it plays critical roles in carcinogenesis and inflammation. However, it remains elusive whether HMGB1 is relocated to cytoplasm in clear cell renal cell carcinoma (ccRCC). METHODS Nuclear and cytoplasmic proteins were extracted by different protocols from 20 ccRCC samples and corresponding adjacent renal tissues. Western blotting and immunohistochemistry were used to identify the expression of HMGB1 in ccRCC. To elucidate the potential mechanism of HMGB1 cytoplasmic translocation, HMGB1 proteins were enriched by immunoprecipitation and analyzed by mass spectrometry (MS). RESULTS The HMGB1 protein was overexpressed and partially localized in cytoplasm in ccRCC samples (12/20, 60%, p<0.05). Immunohistochemistry results indicated that ccRCC of high nuclear grade possess more HMGB1 relocation than those with low grade (p<0.05). Methylation of HMGB1 at lysine 112 in ccRCC was detected by MS. Bioinformatics analysis showed that post-translational modification might affect the binding ability to DNA and mediate its translocation. CONCLUSION Relocation of HMGB1 to cytoplasm was confirmed in ccRCC. Methylation of HMGB1 at lysine 112 might the redistribution of this cofactor protein.
DOI: 10.1136/bmj.g4797
发表时间: 2014-11-10
期刊: BMJ (Clinical research ed.)
影响因子: --
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