研究目的
为验证18F-氟化物PET/CT能识别动脉粥样硬化斑块早期微钙化灶的假设,并评估18F-氟化物的结合机制。
研究成果
在PET阳性但CT阴性的区域中,18F-氟化物PET信号源自正在形成的微钙化灶,这种信号因小微钙化灶的高表面积效应而得到放大,从而支持将其作为识别高危动脉粥样硬化斑块的标志物。
研究不足
离体孵育模型可能无法完全重现18F-氟化物静脉注射的体内环境,且部分容积效应可能影响冠状动脉信号。需进一步研究以区分18F-氟化物PET/CT成像中的假阳性和假阴性。
1:实验设计与方法选择:
本研究采用体外3D胶原水凝胶模型、离体人体标本和小鼠动脉粥样硬化模型,通过近红外荧光分子成像和组织学验证18F-氟化物信号放大效果。
2:样本选择与数据来源:
使用人冠状动脉平滑肌细胞、患者颈动脉内膜切除术及冠状动脉标本,以及LDLr缺陷小鼠。
3:实验设备与材料清单:
包括伽马井型计数器、荧光显微镜、共聚焦显微镜、PET/CT扫描仪、多种钙盐、NIRF示踪剂及组织学染色剂。
4:实验流程与操作步骤:
涉及样本与18F-氟化物及NIRF示踪剂孵育、PET/CT和显微成像,以及组织学分析。
5:数据分析方法:
使用GraphPad Prism进行统计分析,包括Kruskal-Wallis检验、ANOVA、t检验和Pearson相关性分析。
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hydroxyapatite
289396-25G
Sigma-Aldrich
Used in calcium affinity study to test binding with NIRF and 18F-fluoride.
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calcium phosphate
900205-50G
Sigma-Aldrich
Used in calcium affinity study to test binding with NIRF and 18F-fluoride.
-
calcium pyrophosphate
401552-25G
Sigma-Aldrich
Used in calcium affinity study to test binding with NIRF and 18F-fluoride.
-
calcium oxalate
455997-5G
Sigma-Aldrich
Used in calcium affinity study to test binding with NIRF and 18F-fluoride.
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calcium carbonate
C4830-100G
Sigma-Aldrich
Used in calcium affinity study to test binding with NIRF and 18F-fluoride.
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OsteoSense680
NEV10020EX
Perkin Elmer
NIRF calcium tracer used for molecular imaging of calcifications.
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Wizard2 Gamma Counter
Wizard2
Perkin Elmer
Used to measure radioactivity of samples.
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Eclipse 80i microscope
Eclipse 80i
Nikon
Used for fluorescence microscopy imaging.
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human coronary artery smooth muscle cells
PromoCell
Used in in vitro microcalcification model.
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rat tail collagen
BD Biosciences
Used to prepare collagen hydrogels for in vitro model.
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nanoScan PET/CT
nanoScan
Mediso Medical Imaging Systems
Used for high-resolution μPET and CT imaging of specimens.
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OsiriX workstation
OsiriX version 7.5.1, 64-bit
OsiriX Imaging Software
Used for analyzing μPET-CT images.
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von Kossa Stain
KTVKO
American MasterTech
Used to detect calcification in histological sections.
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VECTOR Red Alkaline Phosphatase Substrate kit
SK-5100
Vector Laboratories
Used to detect osteogenic activity and early microcalcifications.
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Nikon A1 confocal microscope
Nikon A1
Nikon
Used for confocal microscopy imaging.
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fluorescence reflectance imaging Kodak imager
Kodak
Used for fluorescence imaging of mouse aortas.
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GraphPad Prism
GraphPad
Software used for statistical analysis.
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