摘要
目的 探究ERK抑制剂PD98059对大鼠听泡成骨细胞增殖及分化的影响。方法 用0.25%胰酶和I型胶原酶两步消化法提取SD乳鼠听泡成骨细胞,分别与浓度为0、10、25和50μmol/L的ERK抑制剂PD98059进行共培养,然后采用EDU法连续4天对4组成骨细胞的增殖进行检测,对各组增殖趋势进行对比分析。用10 mmol/L、50μg/ml和10^(-7) mol/L的浓度的β-甘油磷酸钠、L-维生素C和地塞米松对4组成骨细胞进行成骨诱导分化,24 h后采用RT-qPCR技术检测各组成骨相关因子Ocn、Bsp、Runx2、Bmp2、OPG和RANKL mRNA的表达水平,分析结果。结果 浓度为10、25和50μmol/L的ERK抑制剂PD98059对SD乳鼠听泡成骨细胞的增殖均有不同程度的抑制作用,其中浓度为10μmol/L的PD98059对其增殖的抑制作用明显大于其余3组(P<0.05)。此外,上述不同浓度的PD98059对Ocn、Bsp、Runx2、Bmp2和OPG mRNA的表达均有不同程度的抑制作用,其中Ocn、Bsp、Runx2和Bmp2 mRNA的表达在10μmol/L的PD98059组明显低于0、25和50μmol/L的PD98059组(P<0.05);OPG mRNA的表达在10和25μmol/L的PD98059组明显低于0和50μmol/L的PD98059组(P<0.05),而前二者间的差异并无明显统计学意义(P>0.05)。RANKL mRNA的表达在各组中均未检测出CT值。结论 ERK通路抑制剂PD98059对SD乳鼠听泡成骨细胞的增殖和分化均有抑制作用,推测ERK1/2-MAPK通路可能通过影响大鼠听泡成骨细胞的增殖与分化而介导了鼓室硬化的形成。
Objective To investigate the effect of ERK inhibitor PD98059 on the proliferation and differentiation of rat otocyst osteoblasts.Methods SD neonatal rat osteoblasts were extracted by two-step digestion with 0.25% pancreatin and type I collagenase,and co-cultured with ERK inhibitor PD98059 at concentrations of 0 μmol/L,10 μmol/L,25 μmol/L and 50 μmol/L,respectively.Then,the osteoblasts proliferation of the four groups were assessed by EDU method for 4 consecutive days.The proliferation trend of each group was compared and analyzed.Osteoblasts were differentiated by β-sodium glycerophosphate,L-vitamin C and dexamethasone at concentrations of 10 mmol/L,50 ug/ml and 10^(-7) mol/L.After 24 h,the mRNA expression levels of osteogenic factors which include Ocn,Bsp,Runx2,Bmp2,OPG and RANKL in each group were detected by RT-qPCR,and the differences of the results were analyzed.Results All the concentrations of ERK inhibitor PD98059 could inhibit the proliferation of osteoblasts in SD neonatal rat,and the inhibitory effect of PD98059 at concentrations of 10 μmol/L was significantly greater than that of the other three groups(P<0.05).In addition,all the concentrations of PD98059 could inhibit the expressions of Ocn,Bsp,Runx2,Bmp2 and OPG mRNA.The mRNA expressions of Ocn,Bsp,Runx2 and Bmp2 in 10 μmol/L PD98059 group were significantly lower than those in 0 μmol/L,25 μmol/L and 50 μmol/L PD98059 groups(P<0.05).The mRNA expressions of OPG in 10 and 25 μmol/L PD98059 groups were significantly lower than those in 0 and 50 μmol/L PD98059 groups(P<0.05),and there was no significant difference between the first two groups(P>0.05).The CT value of RANKL mRNA was not detected in all groups.Conclusion ERK pathway inhibitor PD98059 can both inhibit the proliferation and differentiation of osteoblasts in rat otocyst.Therefore,we speculate that ERK1/2-MAPK pathway may mediate the formation of tympanosclerosis by affecting the proliferation and differentiation of rat otocyst osteoblasts.
作者
黄玉
刘豆
黄文霞
梁耕田
Huang Yu;Liu Dou;Huang Wenxia;Liang Gengtian(Department of Otolaryngology-Head and Neck Surgery,the Third Hospital of Wuhan,Wuhan,430060,China)
出处
《听力学及言语疾病杂志》
CAS
CSCD
2024年第2期155-161,共7页
Journal of Audiology and Speech Pathology
基金
武汉市科技局知识创新专项曙光计划(2022020801020554)
武汉市卫健委青年项目(WX21Q24)
武汉市卫健委面上项目(WX21A10)
武汉市卫健委面上项目(WX18C05)。
