研究目的
研究间充质干细胞来源的外泌体是否通过传递微小RNA-126来调节高血糖诱导的视网膜炎症。
研究成果
间充质干细胞来源的外泌体,尤其是那些过表达miR-126的外泌体,通过下调HMGB1信号通路有效减轻高血糖诱导的视网膜炎症,这为糖尿病视网膜病变提供了一种潜在的治疗策略。
研究不足
该研究使用了动物模型和细胞系,可能无法完全模拟人体状况。其治疗作用背后的机制尚未完全阐明,且未评估长期效果或潜在副作用。
1:实验设计与方法选择:
研究从人脐带间充质干细胞(hUCMSCs)中分离外泌体,转入miR-126后,在糖尿病大鼠模型和体外高糖培养的人视网膜内皮细胞(HRECs)中测试其效果。采用ELISA、免疫组化、RT-PCR和Western blotting评估炎症标志物及通路。
2:样本选择与数据来源:
使用链脲佐菌素注射诱导的糖尿病Wistar大鼠及天津赛尔生物公司购买的HRECs。样本包括大鼠玻璃体液和细胞培养上清液。
3:实验仪器与材料清单:
仪器含流式细胞仪(BD FACSAria)、透射电镜、纳米颗粒追踪系统(NanoSight NS300)、酶标仪及Leica DMI4000B显微镜。材料包括抗体、细胞培养基、外泌体提取试剂盒及分子生物学检测试剂。
4:0)、酶标仪及Leica DMI4000B显微镜。材料包括抗体、细胞培养基、外泌体提取试剂盒及分子生物学检测试剂。 实验流程与操作步骤:
4. 实验流程与操作步骤:通过超速离心分离外泌体,测定其粒径和标志物表达后转染miR-126模拟物。体内通过玻璃体内注射入糖尿病大鼠,体外在高糖条件下与HRECs共培养。在特定时间点检测炎症因子及蛋白质/mRNA水平。
5:数据分析方法:
采用SPSS 16.0进行数据分析,根据情况选用Student's t检验、单因素或双因素方差分析,P<0.05视为显著。
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nanoparticle tracking analysis system
NanoSight NS300
Malvern Instruments
Used to measure the size distribution of exosomes.
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centrifuge
CP100WX/CR22N
HITACHI
Used for sequential centrifugation steps during exosome isolation.
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flow cytometer
BD FACSAris
Beckman-Dickinson
Used to examine immunophenotypes of cultured hUCMSCs by detecting surface markers.
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transmission electron microscope
Used to characterize the morphology of exosomes.
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microplate reader
Used for ELISA assays to detect levels of inflammatory factors.
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microscope
Leica DMI4000B
Olympus Soft Imaging Solutions GmbH
Used to take images of immunohistochemically stained retinal sections.
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siPORT NeoFX
Thermo Fisher Scientific
Used for transfection of miR-126 mimics into hUCMSCs.
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ELISA kit
Becton Dickinson
Used to detect levels of caspase-1, IL-1b, and IL-18 in samples.
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antibodies
e.g., CD63, CD9, CD81, HMGB1, NLRP3, NF-jB/P65, VCAM-1, ICAM-1, b-actin
Invitrogen, Thermo Fisher Scientific, Abcam, Sigma-Aldrich Corp.
Used for flow cytometry, Western blotting, and immunohistochemistry to detect specific proteins.
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cell culture medium
DMEM/F12, DMEM, endothelial cell medium
Sigma-Aldrich Corp., Beyotime
Used for culturing hUCMSCs, dermal fibroblasts, and HRECs.
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exosome isolation kit
Used for isolating exosomes from cell supernatants via ultracentrifugation.
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qRT-PCR reagents
TransScript First-Strand cDNA Synthesis SuperMix, TransScript Top Green qPCR SuperMix, TaqMan PCR Reagent
Sigma-Aldrich Corp., TransGen Biotech
Used for quantitative real-time PCR to measure mRNA and miRNA levels.
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BCA assay kit
Used to measure protein concentrations in samples.
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Evans Blue dye
Sigma-Aldrich Corp.
Used to measure blood-retinal barrier breakdown in rats.
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statistical software
SPSS 16.0
SPSS, Inc.
Used for statistical analysis of experimental data.
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