目的研究微小RNA(miR)-483-3p减轻大鼠心肌纤维化的作用,探讨其机制与细胞自噬的关系。方法选取24只雄性SD大鼠,随机分为假手术组、模型组、空白转染组和高表达组,每组6只,通过尾静脉注射异丙肾上腺素建立心肌纤维化模型。空白转染组及...目的研究微小RNA(miR)-483-3p减轻大鼠心肌纤维化的作用,探讨其机制与细胞自噬的关系。方法选取24只雄性SD大鼠,随机分为假手术组、模型组、空白转染组和高表达组,每组6只,通过尾静脉注射异丙肾上腺素建立心肌纤维化模型。空白转染组及高表达组通过尾静脉分别单次注射腺相关病毒(AAV)-空白转染、AAV-miR-483-3p(5×10^(11)vg)进行预处理。14 d后,假手术组经尾静脉注射0.9%的氯化钠溶液[2.5 ml/(kg·d)],持续14 d;模型组、空白转染组和高表达组通过尾静脉注射异丙肾上腺素[2.5 ml/(kg·d),2 mg/ml],持续14 d。检测大鼠心肌病理损伤程度、心肌纤维化程度、胶原蛋白Ⅰ(Collagen-Ⅰ)表达量以及心肌细胞中微管相关蛋白轻链3(LC3)、细胞自噬相关蛋白5(Atg5)和自噬降解底物(P62)的表达。结果与假手术组比较,模型组心肌纤维化面积、Collagen-Ⅰ阳性表达量、Atg5及LC3-Ⅱ/LC3-Ⅰ比值显著增加,P62蛋白表达水平显著降低(P<0.05)。与模型组比较,高表达组心肌纤维化面积、Collagen-Ⅰ阳性表达量、Atg5及LC3-Ⅱ/LC3-Ⅰ比值显著降低[(13.64±1.51)%vs(27.47±1.55)%,(13.48±3.07)%vs(30.91±2.45)%,0.98±0.17 vs 1.24±0.28,0.66±0.05 vs 1.26±0.09,P<0.05],P62蛋白表达水平显著增高(0.91±0.11 vs 0.74±0.06,P<0.05)。结论miR-483-3p可减轻大鼠心肌纤维化,其机制可能与抑制心肌细胞自噬有关。展开更多
Lung cancer poses a serious threat to human life with high incidence and miRNA is an important biomarkerin tumors. This study aimed to explore the effect of miR-143-3p on the biological function of lung cancer cells a...Lung cancer poses a serious threat to human life with high incidence and miRNA is an important biomarkerin tumors. This study aimed to explore the effect of miR-143-3p on the biological function of lung cancer cells and theunderlying mechanism. Eighty-seven samples of lung cancer tissues and 81 samples of tumor-adjacent tissues from patients undergoing radical lung cancer surgery in our hospital were collected. The lung cancer cells and lung fibroblastcells (HFL-1) were purchased, and then miR-143-3p-mimics, miR-NC, si-CTNND1, and NC were transfected into A549 and PC-9 cells to establish cell models. MiR-143-3p and CTNND1 expression levels were measured by the qRT-PCR, Bax, Bcl-2, and CTNND1 expression levels by the Western Blot (WB), and cell proliferation, invasion, and apoptosis by the MTT assay, Transwell assay, and flow cytometry. Dual luciferase report assay was used to determinethe relationship between miR-143-3p and CTNND1. In this study, miR-143-3p was lowly expressed in lung cancer and CTNND1 was highly expressed in lung cancer. The overexpression of miR-143-3p inhibited cell proliferation and invasion, promoted cell apoptosis, significantly increased Bax protein expression, and decreased Bcl-2 protein expression. The inhibition of CTNND1 led to opposite biological characteristic in cells. The dual luciferase reporter assay demonstrated that miR-143-3p was a target region of CTNND1. Such results suggest that miR-143-3p can inhibitthe proliferation and invasion of lung cancer cells by regulating the expression of CTNND1 and promote the apoptosisof lung cancer cells, sott is expected to be a potential target for lung cancer.展开更多
文摘目的研究微小RNA(miR)-483-3p减轻大鼠心肌纤维化的作用,探讨其机制与细胞自噬的关系。方法选取24只雄性SD大鼠,随机分为假手术组、模型组、空白转染组和高表达组,每组6只,通过尾静脉注射异丙肾上腺素建立心肌纤维化模型。空白转染组及高表达组通过尾静脉分别单次注射腺相关病毒(AAV)-空白转染、AAV-miR-483-3p(5×10^(11)vg)进行预处理。14 d后,假手术组经尾静脉注射0.9%的氯化钠溶液[2.5 ml/(kg·d)],持续14 d;模型组、空白转染组和高表达组通过尾静脉注射异丙肾上腺素[2.5 ml/(kg·d),2 mg/ml],持续14 d。检测大鼠心肌病理损伤程度、心肌纤维化程度、胶原蛋白Ⅰ(Collagen-Ⅰ)表达量以及心肌细胞中微管相关蛋白轻链3(LC3)、细胞自噬相关蛋白5(Atg5)和自噬降解底物(P62)的表达。结果与假手术组比较,模型组心肌纤维化面积、Collagen-Ⅰ阳性表达量、Atg5及LC3-Ⅱ/LC3-Ⅰ比值显著增加,P62蛋白表达水平显著降低(P<0.05)。与模型组比较,高表达组心肌纤维化面积、Collagen-Ⅰ阳性表达量、Atg5及LC3-Ⅱ/LC3-Ⅰ比值显著降低[(13.64±1.51)%vs(27.47±1.55)%,(13.48±3.07)%vs(30.91±2.45)%,0.98±0.17 vs 1.24±0.28,0.66±0.05 vs 1.26±0.09,P<0.05],P62蛋白表达水平显著增高(0.91±0.11 vs 0.74±0.06,P<0.05)。结论miR-483-3p可减轻大鼠心肌纤维化,其机制可能与抑制心肌细胞自噬有关。
文摘Lung cancer poses a serious threat to human life with high incidence and miRNA is an important biomarkerin tumors. This study aimed to explore the effect of miR-143-3p on the biological function of lung cancer cells and theunderlying mechanism. Eighty-seven samples of lung cancer tissues and 81 samples of tumor-adjacent tissues from patients undergoing radical lung cancer surgery in our hospital were collected. The lung cancer cells and lung fibroblastcells (HFL-1) were purchased, and then miR-143-3p-mimics, miR-NC, si-CTNND1, and NC were transfected into A549 and PC-9 cells to establish cell models. MiR-143-3p and CTNND1 expression levels were measured by the qRT-PCR, Bax, Bcl-2, and CTNND1 expression levels by the Western Blot (WB), and cell proliferation, invasion, and apoptosis by the MTT assay, Transwell assay, and flow cytometry. Dual luciferase report assay was used to determinethe relationship between miR-143-3p and CTNND1. In this study, miR-143-3p was lowly expressed in lung cancer and CTNND1 was highly expressed in lung cancer. The overexpression of miR-143-3p inhibited cell proliferation and invasion, promoted cell apoptosis, significantly increased Bax protein expression, and decreased Bcl-2 protein expression. The inhibition of CTNND1 led to opposite biological characteristic in cells. The dual luciferase reporter assay demonstrated that miR-143-3p was a target region of CTNND1. Such results suggest that miR-143-3p can inhibitthe proliferation and invasion of lung cancer cells by regulating the expression of CTNND1 and promote the apoptosisof lung cancer cells, sott is expected to be a potential target for lung cancer.
