Sprague-Dawley大鼠肺发育中miR-431的连续表达研究
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摘要
目的探讨miR-431在肺发育形态学中的潜在作用。方法根据肺发育分期,选择Sprague-Dawley大鼠孕16 d(E16)、孕19 d(E19)、孕21 d(E21)、生后1 d(P1)、生后3 d(P3)、生后7 d(P7)、生后14 d(P14)及生后10周(P10周)成年大鼠的肺组织作为观察点,利用苏木精-伊红染色(HE)及透射电镜方法进行肺组织形态学观察;利用荧光原位杂交和实时荧光定量PCR技术检测肺发育关键时期(E19、E21及P3)肺组织中miR-431的表达情况。结果 E19组胎肺组织发现关键事件板层小体及Ⅱ型肺泡上皮细胞的出现;随胎龄增加板层小体数量增加,并出现聚集与排出;生后肺泡形成迅速发生,间质变薄,微血管系统逐渐成熟。荧光原位杂交及实时荧光定量PCR结果均显示随着胎龄的增加,miR-431的表达量逐渐降低(P<0.05)。结论获得系统而连续的肺发育形态学资料。miR-431在肺发育过程中可能起重要的负向调控作用,为后续进一步研究肺发育及相关性疾病的机制提供基础和方向。
Objective To study the role of miR-431 in lung development and morphology. Methods According to the stage of lung development in rats, Sprague-Dawley rats at embryonic day 16(E16), embryonic day(E19),embryonic day(E21), postnatal day 1(P1), postnatal day 3(P3), postnatal day 7(P7), postnatal day 14(P14) and 10 weeks after birth(P10 weeks) were selected, and lung tissue samples were collected for observation. Hematoxylin-eosin staining and transmission electron microscopy were performed to observe the morphology of lung tissue. Fluorescence in situ hybridization and real-time PCR were used to measure the expression of miR-431 during the critical stages of lung development(E19, E21 and P3). Results The E19 group had the formation of the lamellar body and type II alveolar epithelial cells in the fetal lung tissue. The number of lamellar bodies increased with the increasing gestational age, with aggregation and excretion. Pulmonary alveoli formed rapidly, the lung interstitium became thinner, and the microvascular system became mature after birth. Fluorescence in situ hybridization and real-time PCR showed that the expression of miR-431 gradually decreased with the increasing gestational age(P<0.05). Conclusions The systematic and continuous morphological data of lung development is obtained in this experiment. In addition, miR-431 may play an important role in the negative regulation of lung development, which provides basis and direction for further research on the mechanism of lung development and related diseases.
Objective To study the role of miR-431 in lung development and morphology. Methods According to the stage of lung development in rats, Sprague-Dawley rats at embryonic day 16(E16), embryonic day(E19),embryonic day(E21), postnatal day 1(P1), postnatal day 3(P3), postnatal day 7(P7), postnatal day 14(P14) and 10 weeks after birth(P10 weeks) were selected, and lung tissue samples were collected for observation. Hematoxylin-eosin staining and transmission electron microscopy were performed to observe the morphology of lung tissue. Fluorescence in situ hybridization and real-time PCR were used to measure the expression of miR-431 during the critical stages of lung development(E19, E21 and P3). Results The E19 group had the formation of the lamellar body and type II alveolar epithelial cells in the fetal lung tissue. The number of lamellar bodies increased with the increasing gestational age, with aggregation and excretion. Pulmonary alveoli formed rapidly, the lung interstitium became thinner, and the microvascular system became mature after birth. Fluorescence in situ hybridization and real-time PCR showed that the expression of miR-431 gradually decreased with the increasing gestational age(P<0.05). Conclusions The systematic and continuous morphological data of lung development is obtained in this experiment. In addition, miR-431 may play an important role in the negative regulation of lung development, which provides basis and direction for further research on the mechanism of lung development and related diseases.
引文
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[2]Schmalisch G,Wilitzki S,Roehr CC,et al.Development of lung function in very low birth weight infants with or without bronchopulmonary dysplasia:longitudinal assessment during the first 15 months of corrected age[J].BMC Pediatr,2012,12:37.
[3]Stocks J,Hislop A,Sonnappa S.Early lung development:lifelong effect on respiratory health and disease[J].Lancet Respir Med,2013,1(9):728-742.
[4]Ortiz LE,McGrath-Morrow SA,Sterni LM,et al.Sleep disordered breathing in bronchopulmonary dysplasia[J].Pediatr Pulmonol,2017,52(12):1583-1591.
[5]Bhaskaran M,Wang Y,Zhang H,et al.MicroRNA-127modulates fetal lung development[J].Physiological genomics,2009,37(3):268-278.
[6]Lu Y,Thomson JM,Wong HY,et al.Transgenic over-expression of the microRNA miR-17-92 cluster promotes proliferation and inhibits differentiation of lung epithelial progenitor cells[J].Dev Biol,2007,310(2):442-453.
[7]Yang Y,Kai G,Pu XD,et al.Expression profile of microRNAs in fetal lung development of Sprague-Dawley rats[J].Int J Mol Med,2012,29(3):393-402.
[8]Kan Q,Ding S,Yang Y,et al.Expression profile of plasma microRNAs in premature infants with respiratory distress syndrome[J].Mol Med Rep,2015,12(2):2858-2864.
[9]Hussain M,Xu C,Lu M,et al.Wnt/beta-catenin signaling links embryonic lung development and asthmatic airway remodeling[J].Biochim Biophys Acta,2017,1863(12):3226-3242.
[10]柳琪林,胡森,盛志勇.肺泡Ⅱ型上皮细胞形态与功能的研究进展[J].中国危重病急救医学,2003,15(7):445-446.
[11]El-Gendy N,Kaviratna A,Berkland C,et al.Delivery and performance of surfactant replacement therapies to treat pulmonary disorders[J].Ther Deliv,2013,4(8):951-980.
[12]Wang H,Gao X,Liu C,et al.Morbidity and mortality of neonatal respiratory failure in China:surfactant treatment in very immature infants[J].Pediatrics,2012,129(3):e731-e740.
[13]Strueby L,Thebaud B.Advances in bronchopulmonary dysplasia[J].Expert Rev Respir Med,2014,8(3):327-338.
[14]Ali Z,Schmidt P,Dodd J,et al.Bronchopulmonary dysplasia:a review[J].Arch Gynecol Obstet,2013,288(2):325-333.
[15]Jensen EA,Foglia EE,S chmidt B.Evidence-based pharmacologic therapies for prevention of bronchopulmonary dysplasia:application of the grading of recommendations assessment,development,and evaluation methodology[J].Clin Perinatol,2015,42(4):755-779.
[16]刘友红,陈贻骥.维生素A在肺泡分隔期中的作用[J].实用儿科临床杂志,2008,23(16):1287-1289.
[17]Jain D,Bancalari E.Bronchopulmonary dysplasia:clinical perspective[J].Birth Defects Res A Clin Mol Teratol,2014,100(3):134-144.
[18]Bishop AE.Pulmonary epithelial stem cells[J].Cell Prolif,2004,37(1):89-96.
[19]Condo V,Cipriani S,Colnaghi M,et al.Neonatal respiratory distress syndrome:are risk factors the same in preterm and term infants?[J].J Matern Fetal Neonatal Med,2017,30(11):1267-1272.
[20]Pan L,Ren F,Rong M,et al.Correlation between downexpression of miR-431 and clinicopathological significance in HCC tissues[J].Clin Transl Oncol,2015,17(7):557-563.
[21]Liu Y,Li L,Liu Z,et al.Downregulation of MiR-431 expression associated with lymph node metastasis and promotes cell invasion in papillary thyroid carcinoma[J].Cancer Biomark,2018,22(4):727-732.
[22]Yang J,Zhu H,Jin Y,et al.MiR-431 inhibits cell proliferation and induces cell apoptosis by targeting CDK14 in pancreatic cancer[J].Eur Rev Med Pharmacol Sci,2018,22(14):4493-4499.
[23]Su WB,Liu ZY.MiR-431 inhibits colorectal cancer cell invasion via repressing CUL4B[J].Eur Review Med Pharmacol Sci,2018,22(10):3047-3052.
[24]Wertz MH,Winden K,Neveu P,et al.Cell-type-specific miR-431 dysregulation in a motor neuron model of spinal muscular atrophy[J].Hum Mol Genet,2016,25(11):2168-2181.
[25]Lee KP,Shin YJ,Panda AC,et al.miR-431 promotes differentiation and regeneration of old skeletal muscle by targeting Smad4[J].Genes Dev,2015,29(15):1605-1617.
[26]Wu R,Li H,Li T,et al.Myostatin regulates miR-431 expression via the Ras-Mek-Erk signaling pathway[J].Biochem Biophys Res Commun,2015,461(2):224-229.