Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Medical Nanotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.
Sci Rep. 2022 Jul 11;12(1):11774. doi: 10.1038/s41598-022-15660-2.
Here, we investigated the photothermal effect of gold nanorods (GNRs) on human neuroblastoma CD133 cancer stem cells (CSCs) via autophagic cell death. GNRs were synthesized using Cetyltrimethylammonium bromide (CTAB), covered with bovine serum albumin (BSA). CD133 CSCs were enriched from human neuroblastoma using the magnetic-activated cell sorting (MACS) technique. Cells were incubated with GNRs coated with BSA and exposed to 808-nm near-infrared laser irradiation for 8 min to yield low (43 °C), medium (46 °C), and high (49 °C) temperatures. After 24 h, the survival rate and the percent of apoptotic and necrotic CSCs were measured using MTT assay and flow cytometry. The expression of different autophagy-related genes was measured using polymerase chain reaction (PCR) array analysis. Protein levels of P62 and LC3 were detected using an enzyme-linked immunosorbent assay (ELISA). The viability of CSC was reduced in GNR-exposed cells compared to the control group (p < 0.05). At higher temperatures (49 °C), the percent of apoptotic CSCs, but not necrotic cells, increased compared to the lower temperatures. Levels of intracellular LC3 and P62 were reduced and increased respectively when the temperature increased to 49 °C (p < 0.05). These effects were non-significant at low and medium temperatures (43 and 46 °C) related to the control CSCs (p > 0.05). The clonogenic capacity of CSC was also inhibited after photothermal therapy (p < 0.05). Despite these changes, no statistically significant differences were found in terms of CSC colony number at different temperatures regardless of the presence or absence of HCQ. Based on the data, the combination of photothermal therapy with HCQ at 49 °C can significantly abort the CSC clonogenic capacity compared to the control-matched group without HCQ (p < 0.0001). PCR array showed photothermal modulation of CSCs led to alteration of autophagy-related genes and promotion of co-regulator of apoptosis and autophagy signaling pathways. Factors related to autophagic vacuole formation and intracellular transport were significantly induced at a temperature of 49 °C (p < 0.05). We also note the expression of common genes belonging to autophagy and apoptosis signaling pathways at higher temperatures. Data showed tumoricidal effects of laser-irradiated GNRs by the alteration of autophagic response and apoptosis.
在这里,我们通过自噬细胞死亡研究了金纳米棒(GNRs)对人神经母细胞瘤 CD133 癌症干细胞(CSC)的光热效应。GNRs 是使用十六烷基三甲基溴化铵(CTAB)合成的,并用牛血清白蛋白(BSA)覆盖。使用磁激活细胞分选(MACS)技术从人神经母细胞瘤中富集 CD133 CSC。将 GNRs 与 BSA 涂层孵育,并在 808nm 近红外激光下照射 8 分钟,产生低(43°C)、中(46°C)和高(49°C)温度。24 小时后,使用 MTT 测定法和流式细胞术测量 CSC 的存活率和凋亡性及坏死性 CSC 的百分比。使用聚合酶链反应(PCR)阵列分析测量不同自噬相关基因的表达。使用酶联免疫吸附测定(ELISA)检测 P62 和 LC3 的蛋白水平。与对照组相比,暴露于 GNR 的细胞中 CSC 的活力降低(p<0.05)。在更高的温度(49°C)下,与较低的温度相比,凋亡性 CSC 的百分比增加,但坏死细胞没有增加。当温度升高到 49°C 时,细胞内 LC3 和 P62 的水平分别降低和升高(p<0.05)。在低温和中温(43 和 46°C)下,与对照 CSC 相比,这些作用不显著(p>0.05)。光热治疗后,CSC 的集落形成能力也受到抑制(p<0.05)。尽管发生了这些变化,但无论是否存在 HCQ,不同温度下 CSC 集落数量均无统计学差异。基于这些数据,与未用 HCQ 对照匹配组相比,在 49°C 时将光热疗法与 HCQ 联合使用可显著阻止 CSC 的集落形成能力(p<0.0001)。PCR 阵列显示,光热调节 CSC 导致自噬相关基因的改变,并促进凋亡和自噬信号通路的共调节因子。在 49°C 时,与自噬泡形成和细胞内转运相关的因子显著上调(p<0.05)。我们还注意到在较高温度下属于自噬和细胞凋亡信号通路的常见基因的表达。数据表明,通过改变自噬反应和细胞凋亡,激光照射的 GNR 具有肿瘤杀伤作用。
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