RELMα/FIZZ1信号通路对血管新生影响的细胞学研究

目的:探讨类抵抗素分子α/炎症区域分子1(RELMα/FIZZ1)对小鼠主动脉血管平滑肌细胞MOVAS Ca~(2+)/CaM信号通路的调控及小鼠主动脉内皮细胞(MAEC)管腔形成能力的影响。方法:将离体培养的MAEC分为p GSadeno-HK组、p GSadeno-RELMα/FIZZ1组、p GSadeno-sh RNA control组和p GSadeno-sh RNA RELMα/FIZZ1组,MTT法检测细胞活力的变化,基质胶管腔形成实验检测血管生成情况;同时将离体培养的MOVAS细胞分为p GSadeno-HK组、p GSadeno-RELMα/FIZZ1组、p GSadeno-sh RNA control组和p GSadeno-sh RNA RELMα/FIZZ1组,MTT法检测MOVAS的细胞活力变化,Fluo-3 AM钙离子荧光探针和流式细胞术检测细胞内的Ca~(2+)浓度,并用real-time PCR和Western blot检测钙调蛋白(Ca M)和肌球蛋白轻链激酶(MLCK)的m RNA和蛋白表达水平。结果:过表达RELMα/FIZZ1显著提高MAEC的细胞活力,管腔形成数目显著增加(P0.05);干扰RELMα/FIZZ1的表达显著抑制MAEC的细胞活力和管腔形成(P0.05)。过表达RELMα/FIZZ1显著促进MOVAS的细胞活力,细胞内Ca~(2+)平均荧光强度增强,Ca M和MLCK的m RNA和蛋白的表达水平均显著上调(P0.05);干扰RELMα/FIZZ1的表达显著抑制MOVAS的细胞活力,细胞内Ca2+平均荧光强度降低,CaM和MLCK的m RNA和蛋白表达水平均显著下调(P0.05)。结论:RELMα/FIZZ1信号通路参与血管管腔的生成,其机制可能是通过细胞内Ca2+浓度变化调节细胞内Ca M和MLCK的表达,进而对管腔相应功能产生影响。

Effect of RELMα/FIZZ1 signaling pathway on angiogenesis: cytological study

AIM: To investigate the RELMα/FIZZ1 signaling pathway on the regulation of the Ca²⁺/CaM signaling pathway in the mouse aortic smooth muscle cells MOVAS and on the formation of blood vessels in the mouse aortic endothelial cells (MAEC). METHODS: The MAEC cultured in vitro were divided into pGSadeno-HK group, pGSadeno-RELMα/FIZZ1 group, pGSadeno-shRNA control group and pGSadeno-shRNA RELMα/FIZZ1 group. MTT assay was used to detect the viability of the MAEC. The formation of stroma tubes was observed for determining angiogenesis. The MOVAS cells cultured in vitro were also divided into pGSadeno-HK group, pGSadeno-RELMα/FIZZ1 group, pGSadeno-shRNA control group and pGSadeno-shRNA RELMα/FIZZ1 group. The viability of MOVAS cells was measured by MTT assay. Fluo-3 AM fluorescence probe was used to detect intracellular Ca²⁺ concentration. The expression of calmodulin (CaM) and myosin light chain kinase (MLCK) at mRNA and protein levels was determined by real-time PCR and Western blot. RESULTS: Over-expression of RELMα/FIZZ1 significantly promoted the viability of the MAEC. The number of lumen formation was increased significantly (P<0.05). Knockdown of the RELMα/FIZZ1 expression inhibited the viability and lumen formation of MAEC (P<0.05). Over-expression of RELMα/FIZZ1 significantly promoted the viability of the MOVAS cells, enhanced the mean fluorescence intensity of intracellular Ca²⁺, and the expression of CaM and MLCK at mRNA and protein levels was significantly increased. Knockdown of the RELMα/FIZZ1 expression significantly inhibited the viability of the MOVAS cells, the mean fluorescence intensity of Ca²⁺ was decreased, the expression of CaM and MLCK at mRNA and protein levels was decreased significantly (P<0.05). CONCLUSION: RELMα/FIZZ1 signaling pathway is involved in the angiogenesis, and the mechanism may be related to the changes of intracellular Ca²⁺ concentration and then to regulate the intracellular CaM and MLCK expression.