目的:筛选氧化应激状态下CHCHD2(coiled-coil-helix-coiled-coil-helix domain-containing 2)的互作蛋白,以期挖掘出CHCHD2保护神经细胞对抗氧化应激损伤的潜在机制。方法:通过Lipofectamine 2000分别在人神经母细胞瘤细胞系SH-SY5Y中转染含有Flag标签的对照质粒及CHCHD2过表达质粒,用100μmol/L过氧化叔丁醇(tert-butyl hydroperoxide,TBHP)或蒸馏水处理24 h后,采用免疫共沉淀(CoIP)的方法富集各组细胞中与CHCHD2相结合的蛋白,SDS-PAGE跑浓缩胶,切取条带,胶内酶解后进行液相色谱-质谱联用(LC-MS/MS)分析、数据库检索及生物信息分析,筛选与CHCHD2互作的蛋白,并对功能进行初步分析。结果:(1)CHCHD2具有保护SH-SY5Y细胞对抗TBHP诱导的氧化应激损伤作用;(2)CoIP-MS结果提示,不同于生理状态,在氧化应激状态下共有64个蛋白是与CHCHD2互作的特有差异表达蛋白(differentially expressed proteins,DEPs);(3)通过GO功能注释和KEGG富集分析,我们发现氧化应激状态下特有DEPs主要在外泌体和细胞浆中发挥作用,参与蛋白翻译及翻译起始等生物过程,在蛋白及poly(A)RNA结合方面发挥分子功能,并参与糖代谢过程;(4)DEPs还参与了负性调控活性氧生物合成过程和对过氧化氢的反应等抗氧化应激相关生物过程,其中肿瘤坏死因子受体相关蛋白1(tumor necrosis factor receptor-associated protein 1,TRAP1)和热休克蛋白家族D成员1(heat shock protein family D member1,HSPD1)是抗氧化应激过程中重要的候选蛋白;(5)通过蛋白互作网络分析,我们发现在氧化应激状态下特异性存在3个蛋白[Y盒结合蛋白1(Y-box-binding protein 1,YBX1)、含TCP1分子伴侣亚基6A(chaperonin containing TCP1 subunit 6A,CCT6A)和细胞色素C氧化酶装配因子4同源物(cytochrome C oxidase assembly factor 4 homolog,COA4)]与CHCHD2有直接相互作用,也是后续需要重点关注的蛋白。结论:利用CoIP-MS法成功筛选出生理状态及氧化应激状态下CHCHD2的互作蛋白,并挖掘出与其抗氧化应激过程密切相关的2个候选蛋白(TRAP1和HSPD1)及另外3个与其直接作用的候选蛋白(YBX1、CCT6A和COA4),为进一步深入探索CHCHD2抗氧化应激作用中的生物过程及分子机制奠定基础。
肺肉瘤样癌(pulmonary sarcomatoid carcinoma, PSC)是一种非小细胞肺癌的亚型,定义为存在肉瘤或肉瘤样成分。它的发病率低,是一种以远处转移为特征的肿瘤。然而,转移到牙龈是一个罕见的事件。我院偶见1例肺肉瘤样癌牙龈转移病例,旨在加强临床医生对类似病例患者鉴别诊断,提高警惕。Pulmonary sarcomatoid carcinoma (PSC) is a subtype of non-small cell lung cancer defined as the presence of nasarcomatoid or sarcomatoid components. It has a low incidence and is a tumor characterized by distant metastasis. However, metastasis to the gums is a rare event. One case of gingival metastasis of pulmonary sarcomatoid carcinoma was occasionally reported in our hospital. The purpose is to strengthen the differential diagnosis of similar cases and raise the vigilance of clinicians.
卵巢是转移性肿瘤的好发部位,继发性卵巢肿瘤常来源于胃肠道(最常见)、乳房和泌尿生殖道。近年来肠来源继发性恶性肿瘤有逐渐上升趋势,其临床症状与影像学多无特异性表现。本研究以一例继发性卵巢肿瘤为例,通过讨论病史、疾病临床特征、手术与化疗方案及护理的影响,进一步指导患者诊疗及护理。The ovary is a common site for metastatic tumors, and secondary ovarian tumors often originate from the gastrointestinal tract (most commonly), breast, and urogenital tract. In recent years, secondary malignant tumors of enteric origin have been on the rise gradually, and their clinical symptoms and imaging findings are mostly non-specific. In this study, a case of secondary ovarian tumor was taken as an example to further guide the diagnosis, treatment and nursing of the patient by discussing the history, clinical features of the disease, the influence of surgery and chemotherapy and nursing.
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