目的研究长链非编码RNA核旁斑长点组装转录本1(Neat1)在紫外线B诱导人晶状体上皮细胞(LECs)焦亡中的作用及其机制。
方法体外培养人晶状体上皮细胞系HLE-B3，将处于对数生长期的HLE-B3细胞分别采用紫外线B照射0、2、4和8 h；采用Western blot法检测照射不同时长后焦亡相关蛋白胱天蛋白酶1(caspase-1)的表达，采用实时荧光定量PCR法检测照射不同时长后细胞中Neat1 mRNA相对表达量，采用细胞计数试剂盒8(CCK-8)法检测细胞活力并以此筛选紫外线诱导LECs焦亡的最佳照射时长，最终确定为4 h。另将HLE-B3细胞分为阴性siRNA转染组、siRNA Neat1转染组、阴性siRNA转染+照射组和siRNA Neat1转染+照射组，采用相应试剂转染24 h，其中阴性siRNA转染+照射组和siRNA Neat1转染+照射组转染相应试剂后采用紫外线B照射4 h。采用CCK-8法检测各组细胞活力，流式细胞术检测细胞焦亡，Western blot法检测caspase-1、gasdermin D蛋白(GSDMD)、NOD样受体蛋白3(NLRP3)表达，ELISA法检测白细胞介素(IL)-1β质量浓度，透射电子显微镜下观察各组HLE-B3细胞超微结构变化。
结果随照射时间的延长，caspase-1蛋白表达条带灰度呈递增趋势。照射0、2、4、8 h caspase-1蛋白相对表达量分别为0.05±0.01、0.25±0.07、0.51±0.04和0.74±0.02，总体比较差异有统计学意义( F＝168.223， P<0.001)，其中照射不同时长两两比较，差异均有统计学意义(均 P<0.05)。Neat1 mRNA相对表达量随照射时间延长呈递增趋势，细胞活力值呈递减趋势，照射不同时长两两比较，差异均有统计学意义(均 P<0.05)。与阴性siRNA转染组比较，siRNA Neat1转染组细胞活力值升高，阴性siRNA转染+照射组细胞活力值降低，差异均有统计学意义(均 P<0.01)；与阴性siRNA转染+照射组比较，siRNA Neat1转染+照射组细胞活力值升高，差异有统计学意义( P<0.05)。阴性siRNA转染组和siRNA Neat1转染+照射组细胞焦亡率明显低于阴性siRNA转染+照射组，差异均有统计学意义(均 P<0.01)。阴性siRNA转染+照射组caspase-1、NLRP3、GSDMD蛋白相对表达量均较阴性siRNA转染组和siRNA Neat1转染+照射组高，差异均有统计学意义(均 P<0.01)。阴性siRNA转染+照射组IL-1β质量浓度明显高于阴性siRNA转染组和siRNA Neat1转染+照射组，差异均有统计学意义(均 P<0.05)。透射电子显微镜下观察可见，阴性siRNA转染+照射组和siRNA Neat1转染+照射组细胞肿胀，细胞膜孔隙形成，线粒体肿胀，呈空泡状，线粒体嵴模糊，其中与阴性siRNA转染+照射组相比，siRNA Neat1转染+照射组细胞肿胀程度减轻，细胞膜孔隙减少，线粒体肿胀程度亦减轻。
结论Neat1通过caspase-1介导的焦亡经典途径参与紫外线B诱导的人LECs焦亡过程，沉默Neat1可以抑制人LECs焦亡。
ObjectiveTo investigate the role of long non-coding RNA nuclear paraspeckle assembly transcript 1 (Neat1) in pyroptosis of ultraviolet B (UVB)-induced human lens epithelial cells (LECs) and to explore the possible mechanism.
MethodsThe human lens epithelial cell line HLE-B3 was cultured in vitro, and cells at log phase were exposed to ultraviolet B for 0, 2, 4 and 8 hours, respectively.The expression of cysteine aspartic acid-specific protease-1 (caspase-1), a protein related to pyroptosis, was detected by Western blot.The relative expression level of Neat1 in cells after different irradiation durations was determined by real-time quantitative PCR.Cell viability was determined by the cell counting kit-8 (CCK-8) method to screen the optimal irradiation duration for UVB-induced LECs pyroptosis, which was finally determined to be 4 hours.HLE-B3 cells were divided into negative siRNA transfection group, siRNA Neat1 transfection group, negative siRNA transfection+ irradiation group and siRNA Neat1 transfection+ irradiation group, and were transfected with corresponding reagents for 24 hours.The negative siRNA transfection+ irradiation group and siRNA Neat1 transfection+ irradiation group were irradiated with UVB for 4 hours after transfection.The cell viability was detected by the CCK-8 method.The pyroptosis rate was detected by flow cytometry.The expression levels of caspase-1, gasdermin D (GSDMD) and nod-like receptor protein 3 (NLRP3) proteins were detected by Western blot.The concentration of interleukin (IL)-1β was detected by enzyme-linked immunosorbent assay (ELISA). Ultrastructural changes in HLE-B3 cells were observed under a transmission electron microscope.
ResultsThe grayscale of caspase-1 protein bands increased with the extension of irradiation duration.The relative expression levels of caspase-1 protein at 0, 2, 4 and 8 hours of irradiation were 0.05±0.01, 0.25±0.07, 0.51±0.04 and 0.74±0.02, respectively, with a statistically significant overall difference ( F=168.223, P<0.001), and significant differences were found in paired comparisons (all at P<0.05). With prolonged irradiation, the relative expression level of Neat1 mRNA increased and the cell viability decreased, with statistically significant differences in paired comparisons (all at P<0.05). Compared with negative siRNA transfection group, the cell viability was increased in siRNA Neat1 transfection group and decreased in negative siRNA transfection+ irradiation group, with statistically significant differences (both at P<0.01). Compared with negative siRNA transfection+ irradiation group, the cell viability was increased in siRNA Neat1 transfection+ irradiation group, showing a statistically significant difference ( P<0.05). The pyroptosis rate was significantly lower in negative siRNA transfection group and siRNA Neat1 transfection+ irradiation group than in negative siRNA transfection+ irradiation group, and the differences were statistically significant (both at P<0.01). The relative expression levels of caspase-1, NLRP3 and GSDMD proteins in negative siRNA transfection+ irradiation group were higher than those in negative siRNA transfection group and siRNA Neat1 transfection+ irradiation group and the differences were statistically significant (all at P<0.01). The concentration of IL-1β was significantly higher in negative siRNA transfection+ irradiation group than in negative siRNA transfection group and siRNA Neat1 transfection+ irradiation group, and the differences were statistically significant (all at P<0.05). Cell swelling, formed cell membrane pores, vacuolated cells and fuzzy mitochondrial cristae were seen in negative siRNA transfection+ irradiation group and siRNA Neat1 transfection+ irradiation group by transmission electron microscopy.Compared with negative siRNA transfection+ irradiation group, slighter cell swelling, fewer cell membrane pores and lighter mitochondrial swelling were seen in siRNA Neat1 transfection+ irradiation group.
ConclusionsNeat1 is involved in human LECs pyroptosis induced by UVB through the classic pyroptosis pathway mediated by caspase-1.Knockdown of Neat1 can inhibit the pyroptosis of human LECs.
王敏,王妍茜,陈颖,等. 长链非编码RNA Neat1对紫外线B诱导人晶状体上皮细胞焦亡的抑制作用及其机制[J]. 中华实验眼科杂志,2023,41(06)：536-544.
DOI:10.3760/cma.j.cn115989-20211214-00687版权归中华医学会所有。
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王敏：酝酿和设计实验、实施研究、采集数据、统计分析、分析/解释数据、起草及修改文章；王妍茜：酝酿和设计实验、分析/解释数据、对文章的知识性内容作批评性审阅及指导；陈颖：酝酿和设计实验、实施研究、分析/解释数据、对文章的知识性内容作批评性审阅；赵越越：实施研究、分析/解释数据；杨涛：分析/解释数据；康刚劲：酝酿和设计实验、分析/解释数据、对文章的知识性内容作批评性审阅及定稿
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