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益骨胶囊含药血清对成骨细胞ER和IL-6影响的研究
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摘要
目的:
     运用中药血清药理学方法体外观察益骨胶囊含药血清对新生大鼠成骨细胞增殖、分化、矿化的影响,探讨制备含药血清的时效和量效关系。同时从mRNA水平及蛋白水平研究益骨胶囊含药血清对成骨细胞ER和IL-6表达的影响,试图从雌激素调控途径探讨益骨胶囊防治骨质疏松症的机理。
     方法:
     (1)将12月龄SD大鼠分40只,随机分为4组(益骨胶囊高、中、低剂量组和生理盐水组),制备含药血清和空白对照血清;(2)分离培养新生SD大鼠的OB,采用MTT法、分光光度计比色法和茜素红染色法,分别测定3组即敏感浓度含药血清组(高剂量稀释比1:4)、空白灭活对照血清组和DMEM培养液组对OB增殖、分化和矿化的影响;(3)用RT-PCR技术和RBA法分别检测3组对OB表达ERαmRNA、ERβmRNA及其蛋白的影响;(4)用RT-PCR技术和RIA试剂盒分别检测3组对OBIL-6mRNA及其蛋白表达的影响。
     结果:
     (1)末次灌胃后1.5h采血的MTT值和同组其它时间比较具有统计学意义(P<0.05);血清添加浓度为25%时高剂量组MTT值最高,和其它组比较具有统计学意义(P<0.05)。(2)益骨胶囊含药血清组ALP值及OB矿化结节数量均明显高于空白血清对照组及培养液组(P<0.05)。(3)益骨胶囊含药血清组ERα/β-actin的灰度积分值和对照组比较无统计学意义(P>0.05);ERβ/β-actin高于对照组(P<0.05);IL-6/β-actin低于对照组(P<0.05)。(4)益骨胶囊含药血清组KD值和对照组比较不具有统计学意义(P>0.05);RT值明显高于对照组(P<0.01)。(5)益骨胶囊含药血清组IL-6含量明显低于对照组(P<0.05)。
     结论:
     益骨胶囊含药血清能促进成骨细胞增殖、分化、矿化;能上调OB ERβmRNA表达,增加ER蛋白数量;能下调OB IL-6mRNA表达,抑制OB分泌IL-6;这提示益骨胶囊主要通过ERβ来发挥类雌激素作用。它能促进体外培养的成骨细胞的骨形成,同时可能也影响骨吸收。通过雌激素及其受体调控途径防治OP是益骨胶囊的药理机制之一。
Objective: To use the method of Chinese herbal seropharmacology, to investigate the effect of the rats sera containing Benefiting-bone capsule (BBC) on the cell proliferation, cell differentiation and cell mineralization of rat osteoblast in vitro skulls of neonatal SD rats and to research the relationship between the best time-effectiveness and dosage-effectiveness, and at the same time, to study the significant changes of both alpha and beta estrogen receptors in the osteoblast and the production of Interleukin-6(IL-6) by adding the rats sera containing BBC by studying the expression level of both the mRNA and the protein. This is performed to explore the mechanism of BBC on the prevention and treatment osteoporosis by means of estrogenic modulation and control.
    Methods: Forty female SD rats, aged 12 months, were used and randomly divided into 4 groups including N.S., low dosage, middle dosage and high dosage with BBC, the sera were extracted at different times. The MTT method was used to determine the best time-efficiency and dosage-efficiency. To obtain osteoblasts from neonatal SD rat's skull using the method of twice enzyme digestion, conducted primary culture and subcultures.There are three groups including Group I (containing deactivating sera with BBC), Group II (containing deactivating sera without BBC) and Group III (simple DMEM medium group). Also, spectrophoto- meter colorimetry assays were used to examine the activity of the alkaline phospha tase. Alizarin at 0.1% was used to count the mineralized nodes in discussing the influence involving the differentiation and the mineralization of the osteoblast of the rats sera containing BBC. RT-PCR technology was used to study the estrogenic receptor α,
    βmRNA, IL-6 mRNA and p-actin mRNA. The RBA method was u
    sed to study the affinity of estrogen receptors and the number of receptors. The RIA method was used to study IL-6 in the culture (including the sera) of the osteoblasts.
    Results: The MTT value reached its highest point 1.5 hours after oral administration, which was considered to be statistically significant when compared with others (P<0.05). MTT of high dosage met the maximum value with the concen tration of 25%, and was considered to be statistically significant (P<0.05). Thereby increasing the number of ALP, mineralized nodes and up-modulating the expression of ERp mRNA ( P<0.05), without boosting the affinity of ER compared to the control groups (P>0.05) but increasing the receptors number statistically significantly(P<0.01).
    
    
    
    Both can down-modulate the expression of IL-6 mRNA and protein ( P<0.05). Conclusions: The rats sera containing BBC can promote proliferation, differentiation and mineralization of osteoblasts, there is an up-modulating of the osteoblastular ERβ mRNA and an increase in the number of their receptors' protein, at the same time, a down-modulating of the osteoblastular IL-6 mRNA and a decrease in the amount of IL-6 secreted by osteoblasts. These indicate an estrogenic action on bones through ERβ modulation. BBC, a Chinese herbal complex prescription, can effectively treat Osteoporosis through the modulating mechanism of estrogenic pathway. This is worth further research.
引文
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