Nano Lett:科学家研制成功新型钆纳米颗粒T2核磁共振造影剂

2019-03-28 佚名 中国科学技术大学

近日,国际学术期刊Nano Letters 在线发表了中国科学技术大学化学与材料科学学院教授梁高林课题组的研究成果,文章标题为γ-Glutamyltranspeptidase Triggered Intracellular Gadolinium Nanoparticle Formation Enhances the T2-Weighted MR Contrast of Tumor。该文报道了一种由

近日,国际学术期刊Nano Letters 在线发表了中国科学技术大学化学与材料科学学院教授梁高林课题组的研究成果,文章标题为γ-Glutamyltranspeptidase Triggered Intracellular Gadolinium Nanoparticle Formation Enhances the T2-Weighted MR Contrast of Tumor。该文报道了一种由γ-谷氨酰转肽酶(GGT)诱导的细胞内原位组装钆纳米颗粒的策略,并实现了高强磁场下肿瘤的横向(T2)磁共振成像增强。

γ-谷氨酰转肽酶普遍存在于哺乳动物细胞和细菌的膜上,参与内源性谷胱甘肽的代谢和细胞内半胱氨酸水平的平衡,在维持细胞的氧化还原平衡中发挥重要作用。此外,GGT可能通过调节细胞内的氧化还原代谢以促进肿瘤的发展、入侵和耐药。报道表明,许多恶性肿瘤如肝癌、宫颈癌、卵巢癌乳腺癌中都有过度表达的GGT。作为一种重要的生物标志物,GGT的特异性检测可以用于癌症的早期诊断。磁共振成像(MRI)具有非侵入性、高穿透深度以及优良的空间分辨率,在深层肿瘤的诊断中有着独特的优势。但是,MRI的灵敏度很低,通常需要造影剂来增强正常组织与病理组织的成像对比度。钆造影剂在临床上用于软组织的纵向(T1)磁共振成像。有趣的是,梁高林课题组发现钆纳米结构在高强磁场下(9.4 T)可以用作一种新型T2磁共振造影剂。因此,他们在该工作中设计了一种可以在细胞内自组装形成纳米颗粒的钆小分子探针。该小分子探针在进入细胞的过程中被细胞膜上的GGT特异性剪切,然后在细胞内被谷胱甘肽还原,通过CBT-Cys点击缩合反应在细胞内自组装形成钆纳米颗粒(见下图)。他们与中科院合肥物质科学研究院强磁场科学中心研究员钟凯课题组合作,在9.4 T下小鼠肿瘤活体磁共振成像结果表明,相比于对照组,这种原位GGT特异性诱导的钆纳米颗粒显着增强了小鼠肿瘤的T2加权磁共振成像信号。这种新型的T2磁共振造影剂有望未来应用于临床上γ-谷氨酰转肽酶相关疾病(包括癌症)的诊断。



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    2019-03-30 sodoo

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蒽环霉素引起的心脏毒性是一个重要的临床问题,然而尚缺乏早期预测蒽环霉素引起的心脏毒性的标志物。本研究的目的旨在动物实验中通过连续多参数心脏磁共振(CMR)来评估阿霉素引起的心脏毒性。 本研究纳入了20只实验猪,其中5只接受了5次两周一次的冠脉内阿霉素的输注(0.45 mg/kg),随访16周;5只接受了3次两周一次的冠脉内阿霉素的输注,随访16周,第三组动物在第三次给药后被处死。所有动物