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Nanoparticle Enhanced MRI Scanning to Detect Cellular Inflammation in Experimental Chronic Renal Allograft Rejection

机译:纳米粒子增强MRI扫描以检测实验性慢性肾移植排斥反应中的细胞炎症

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Objectives. We investigated whether ultrasmall paramagnetic particles of iron oxide- (USPIO-) enhanced magnetic resonance imaging (MRI) can detect experimental chronic allograft damage in a murine renal allograft model.Materials and Methods. Two cohorts of mice underwent renal transplantation with either a syngeneic isograft or allograft kidney. MRI scanning was performed prior to and 48 hours after USPIO infusion usingT2∗-weighted protocols.R2∗values were calculated to indicate the degree of USPIO uptake. Native kidneys and skeletal muscle were imaged as reference tissues and renal explants analysed by histology and electron microscopy.Results.R2∗values in the allograft group were higher compared to the isograft group when indexed to native kidney (median 1.24 (interquartile range: 1.12 to 1.36) versus 0.96 (0.92 to 1.04),P<0.01).R2∗values were also higher in the allograft transplant when indexed to skeletal muscle (6.24 (5.63 to 13.51)) compared to native kidney (2.91 (1.11 to 6.46)P<0.05). IncreasedR2∗signal in kidney allograft was associated with macrophage and iron staining on histology. USPIO were identified within tissue resident macrophages on electron microscopy.Conclusion. USPIO-enhanced MRI identifies macrophage.
机译:目标。我们研究了氧化铁-(USPIO-)增强磁共振成像(MRI)的超小顺磁粒子是否可以检测鼠肾同种异体移植模型中实验性慢性同种异体移植物的损伤。材料和方法。两组小鼠均接受了同种异体肾移植或同种异体肾移植。使用T2 *加权方案在输注USPIO之前和之后48小时进行MRI扫描。计算R2 *值以指示USPIO摄取的程度。结果将同种异体移植组的R2 *值比同种异体移植组高(中位数1.24(四分位数范围:1.12至1.12 1.36)vs 0.96(0.92至1.04),P <0.01)。与天然肾脏(2.91(1.11至6.46)P)相比,同种异体移植到骨骼肌上的R2 *值(6.24(5.63至13.51))也更高<0.05)。肾脏同种异体移植物中R2 *信号的增加与组织学上的巨噬细胞和铁染色有关。在电子显微镜下在组织巨噬细胞内鉴定出USPIO。结论。 USPIO增强的MRI可识别巨噬细胞。

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