Osteocalcin secretion by the human osteosarcoma cell line MG-63

The human osteosarcoma cell line MG-63 has been used to study the production of the bone-specific protein, osteocalcin. In the absence of any stimuli, MG-63 cells secreted very low levels of osteocalcin. The secretion of osteocalcin started after a lag time of 10-12 h upon 1,25-(OH)2D3 treatment. Osteocalcin secretion was measured at doses as low as 0.03 nM (fourfold increase, p less than 0.05), and this activity increased further with higher doses of 1,25-(OH)2D3 to reach a plateau at 50 nM. The secretion increased transiently from very low levels in sparse cell cultures to peak values in subconfluent cultures (+/- 40%), two- to threefold above values obtained for confluent cells. Values for confluent cells average 55.9 +/- 2.0 ng/ml protein per 48 h. A similar behavior is observed for 1,25-(OH)2D3 receptor concentration under similar experimental conditions. Bmax increased transiently from sparse to subconfluent cell cultures (40-60% confluent) and reached values 50% lower in confluent cells. However, the receptor affinity was not affected by cell density. MG-63 cells also possessed an alkaline phosphatase isoenzyme of the bone-liver-kidney type that was stimulated by 1,25-(OH)2D3 treatment (two- to threefold) and inhibited by parathyroid hormone (40 nM, -25%, p less than 0.025). PTH and PGE2 increased cAMP production in a dose-dependent manner, but the cells were irresponsive to salmon calcitonin. Basal and PTH-responsive cyclic AMP production were also modulated by cell density. Dexamethasone pretreatment (100 nM, 48 h) stimulated the PTH-dependent cAMP production but failed to influence the response to PGE2.(ABSTRACT TRUNCATED AT 250 WORDS)     

Melatonin inhibits the proliferation of human osteosarcoma cell line MG-63

It seems established that the onset of osteosarcoma and the reduction in melatonin production run in parallel; this suggests that the decline in the cancer-inhibiting agent, melatonin, may contribute to the occurrence of osteosarcoma and that melatonin supplementation may have promise for preventing the development and progression of this condition. There is, however, no direct evidence regarding an antiproliferative effect of melatonin in osteosarcoma cells. In the current study, we examined whether melatonin inhibits the proliferation of human osteosarcoma cell line MG-63. MTT staining showed that at 4 mM–10 mM concentrations, melatonin significantly reduced the MG-63 cell proliferation in a dose-dependent and time-dependent manner. Flow cytometry documented that 4 mM melatonin significantly increased the fraction of cells in the G₀/G₁ phase of the cell cycle, while simultaneously reducing the proportion in the S and G₂/M phases. Western blot and real-time PCR analyses further confirmed that melatonin's inhibitory effect was possibly because of downregulation of cyclin D1 and CDK4, related to the G₁ phase, and of cyclin B1 and CDK1, related to the G₂/M phase. There was no downregulation of cyclin E, CDK2, and cyclin A, which are related to G₁/S transition and S phase. These findings provide evidence that melatonin may significantly inhibit human osteosarcoma cell proliferation in a dose-dependent and time-dependent manner and this inhibition involves the downregulation of cyclin D1, CDK4, cyclin B1 and CDK1.     

Effect of ciprofloxacin on the proliferation of osteoblast-like MG-63 human osteosarcoma cells in vitro

Locally applied antibiotic therapy is gaining popularity for the treatment of infections associated with open fractures and posttraumatic osteomyelitis. With use of local techniques, ciprofloxacin levels as high as 1,300 μg/ml. or over 200 times the bone levels achieved with intravenous administration, have been reported. To study the possible effects of ciprofloxacin on bone, osteoblast-like cells from the MG-63 human osteosarcoma cell line were studied. The cells were grown in antibiotic-free media and exposed to concentrations of ciprofloxacin at 0, 10, 100, 200, and 1,000 μg/ml to establish an initial dose-response curve. Media containing the appropriate dose of ciprofloxacin were changed every 24 hours. Cell number and [³H]thymidine incorporation per cell were determined at 0, 24 and 72 hours. A second dose-response curve was performed at concentrations of 0, 10, 20, 40, and 80 μg/ ml. Three experiments, each with four observations, were performed. The results of this study demonstrated that ciprofloxacin caused significant decreases (p < 0.05) in cell number at 40 μg/ml at 24 hours and 20 μg/ml at 72 hours. [³H]thymidine incorporation per cell decreased significantly at levels of 80 μg/ml at 24 hours and 20 μg/ml at 72 hours. The authors conclude that reported local levels of ciprofloxacin seen in vivo inhibit the proliferation of human osteoblast-like cells in vitro.     

人参皂苷CK对人骨肉瘤细胞MG-63的凋亡诱导作用

[目的]探讨人参皂苷CK对人骨肉瘤细胞MG-63的凋亡诱导作用及其具体作用机制。[方法]MG-63细胞分为空白对照组和CK药物处理组。采用MTT法检测细胞活性及增殖能力,倒置显微镜下观察细胞凋亡形态。细胞凋亡形态检测、Hoechst细胞核染色及Annexin V/PI细胞凋亡实验检测药物CK对细胞的诱导凋亡作用;Western blotting检测凋亡相关蛋白Caspase-9、Bcl-2及BAX的表达,研究其具体凋亡机制。[结果]CK能够显著降低MG-63的体外活性及生存率(P<0.05);细胞凋亡形态检测、Hoechst细胞核染色及Annexin V/PI细胞凋亡实验证明CK可诱导MG-63凋亡(P<0.05);CK处理后MG-63细胞表达的Caspase-9及BAX表达上调,相反Bcl-2表达下调(P<0.05)。[结论]人参皂苷CK对人骨肉瘤细胞MG-63具有凋亡诱导作用,而以Caspase-9为关键因素的线粒体凋亡途径在此凋亡中起着决定性作用。     

Chemotactic response of osteoblast-like cells to transforming growth factor beta

Transforming growth factor beta (TGF-beta) was tested for its ability to stimulate a chemotactic response in two clonal rat osteosarcoma (ROS) cell lines, 17/2 and 25/1. TGF-beta stimulated dose-dependent chemotaxis in both cell lines. In serum-containing media, maximal response was seen at a concentration of 500 fg (10⁻¹⁵g)/mL for the ROS 17/2 cells and 25 fg/mL for the ROS 25/1 cells. In serum-free media, the maximal chemotactic response to TGF-beta occurred at 5 fg/mL for both the ROS 17/2 and 25/1 cells. TGF-beta was not mitogenic at these dosages. The results indicate that TGF-beta could act as a chemoattractant for osteogenic cells in both demineralized bone matrix induced osteogenesis and in normal bone remodeling.     

噻莱昔布(celecoxib)对人骨肉瘤细胞MG-63增殖与凋亡的影响

目的:研究环氧化酶2(cyclooxygenase2,COX2)抑制剂celecoxib对人骨肉瘤细胞MG63抑制增殖及诱导凋亡的作用。方法:MTT比色观察celecoxib的细胞毒性作用及其浓度依赖性;Hoechst33258荧光染色、透射电子显微镜和TUNEL观察细胞凋亡的形态学变化;流式细胞仪检测细胞凋亡率及其时间依赖性。结果:celecoxib分别以10、20、40、80μmol/L作用后,细胞生长受到不同程度抑制;荧光显微镜、电镜和TUNEL观察到细胞胞浆浓缩、核凝聚、核碎裂和凋亡小体形成。流式细胞仪显示celecoxib40μmol/L作用24、48、72h后,细胞凋亡率分别与对照组比较有非常显著性差异(P<0.01)。结论:celecoxib能抑制人MG63细胞增殖,诱导细胞凋亡。     

Zeolite A increases proliferation, differentiation, and transforming growth factor beta production in normal adult human osteoblast-like cells in vitro.

Silicon in trace amounts enhances bone formation, and the silicon-containing compound zeolite A (ZA) increases eggshell thickness in hens. In the studies reported here, treatment of nearly homogeneous strains of normal human osteoblast-like cells for 48 h with ZA at 0.1-100 micrograms/ml induced a dose-dependent increase (r = 0.35, P < 0.001) in DNA synthesis (n = 31) to 162 +/- 16% (mean +/- SEM) of control and in the proportion of cells in mitosis (n = 4) from 9.1 +/- 1.8 to 27.0 +/- 4.5% (r = 0.69, P < 0.005). ZA treatment also increased alkaline phosphatase activity (P < 0.05) and osteocalcin release (P < 0.05) but did not significantly affect collagen production per individual cell. The mitogenic action of ZA was dependent on cell seeding density over the range of 1250-40,000 cells per cm2, which is consistent with induction of an autocrine factor(s). TGF-beta is a potent mitogen for osteoblasts. ZA treatment increased the steady-state mRNA levels of transforming growth factor beta 1 (TGF-beta 1) and induced the release of the latent form of TGF-beta protein into the conditioned medium within 6 h. We conclude that ZA induces the proliferation and differentiation of cells of the osteoblast lineage.     

甲氨蝶呤对人骨肉瘤MG-63细胞凋亡及28Livin和Caspase-3表达的影响

目的 观察甲氨蝶呤(MTx)对人骨肉瘤MG-63细胞凋亡及Livin和Caspase-3表达的影响.方法 体外培养骨肉瘤MG-63细胞株,用0、50、100、200和400μmol/L的MTX作用于骨肉瘤MG-63细胞24、48、72 h后,用噻唑蓝(MTT)比色法检测骨肉瘤MG-63细胞的增殖活性,用流式细胞仪测细胞的凋亡率,用Western blot检测不同浓度MTX作用于骨肉瘤MG-63细胞24 h后各组细胞的Livin和Caspase-3蛋白表达水平.结果 随MTX浓度增加骨肉瘤MG-63细胞的增殖活性降低,同时细胞的凋亡率增加(P＜0.05),随MTX浓度增加各组细胞中Livin蛋白的表达降低,Caspase-3蛋白表达增加(P＜0.05).结论 MTX诱导人骨肉瘤MG-63细胞凋亡,其机制可能与下调Livin表达继而上调Caspase-3表达有关.

Abstract：

Objective To observe the effect of Methotrexate (MTX) on apoptosis and expression of Livin and Caspase-3 in human osteosarcoma cell line MG-63. Methods After treatment of MG-63 cells with MTX at different concentrations (0, 50, 100,200,400 μmol/L) for 24, 48 and 72 h, methyl thiazol tetrazolium(MTT) assay was used to observe the growth inhibition of MG-63. The apoptosis was assessed by flow cytometry. The protein expression of Livin and Caspase-3 was detected by Western blotting. Results When MTX was added, growth inhibition and increased apoptosis of MG-63 cells were detected,which was showed in a dose- and time-dependent manner. MTX also down-regulated the level of the protein expression of Livin (P＜0.05), and elevated the protein expression of Caspase-3 (P＜0.05). Conclusion MTX can induce apoptosis of MG-63 cells, by down-regulating Livin expression and subsequently up-regulating Caspase-3 expression.     

LC 促进人成骨样 MG-63 细胞增殖及相关机制的研究

目的探讨大黄酸哌嗪雌酚酮(rhein-piperizinyl-estrone,LC)对人成骨样MG-63细胞增殖活性的影响及其相关分子机制。方法在原工作基础上,以兼有两种雌激素受体(estrogen receptor,ER)亚型表达的人成骨样MG-63细胞为研究对象,分别应用MTT法和流式细胞术,观察LC对MG-63细胞的增殖活性和细胞周期分布的影响。利用前期构建的ERα或ERβ稳定高抑制表达的MG-63细胞株,应用免疫印迹技术,对LC的作用机制和可能的信号通路进行研究。结果与对照组相比,LC可明显促进MG-63细胞的增殖活性,该作用具有剂量依赖性;可调节细胞周期分布,使G1期细胞比例减少、G2+S期细胞比例增加,进而促进细胞生长。进一步研究发现,ER阻断剂ICI 182,780可完全阻断LC的促增殖作用,提示LC是经ER途径对MG-63的增殖活性发挥作用的;利用ERα或ERβ高抑制表达的稳定细胞株,证实LC的促增殖作用是由ERα和ERβ共同介导的;该作用与Ras/MEK/ERK、PI3K/Akt信号通路的激活密切相关。结论 LC可经ERα和ERβ共同介导对人成骨细胞的促增殖作用,有望成为治疗绝经后骨质疏松症的新型骨靶向雌激素类药物。     

靶向Survivin的小分子干扰RNA对骨肉瘤细胞的体内外抑制作用

目的 观察靶向Survivin基因的小分子干扰RNA(siRNA)表达载体对人骨肉瘤细胞MG-63的体内外抑制作用.方法 体外构建Survivin siRNA表达载体pSilence2.1-neo-Survivin,转染骨肉瘤细胞株MG-63、逆转录-聚合酶链反应(RT-PCR)、免疫组织化学(SP)法检测转染前后Survivin mRNA及蛋白的表达,流式细胞仪检测细胞周期分布,吖啶橙荧光染色法观察细胞凋亡,建立裸鼠移植瘤模型,记录瘤体形成时间及肿瘤生长.结果 转染后MG-63细胞Survivin基因mRNA水平和蛋白表达显著下降,转染后mRAN表达抑制率为85.08%,增殖指数为空白组的28.20%;细胞周期分析显示:shRNA组G0/G1期细胞明显增多,而G2/M期、S期细胞数目减少;吖啶橙染色显示转染组细胞出现明显核碎裂等凋亡改变,转染组凋亡率为24.54%;稳定转染组细胞裸鼠体内致瘤能力降低,转染组成瘤时间为(13.2±2.0)d,空白组为(6.5±1.6)d,两者比较差异有统计学意义(P＜0.01).4周时同空白组相比转染组瘤体体积小62.89%(P＜0.01),重量轻59.07%(P＜0.01).结论 靶向Survivin基因的siRNA表达载体可以显著抑制骨肉瘤细胞MG-63增殖,促进细胞凋亡;明显抑制人骨肉瘤细胞的致瘤活性及裸鼠移植瘤的生长.     

Survivin基因干扰RNA对骨肉瘤MG-63细胞系增殖和凋亡的影响

[目的]观察Survivin基因siRNA表达载体对骨肉瘤细胞增殖和凋亡的影响。[方法]体外构建Survivin shRNA表达载体pSilence2．1-neo-Survivin，转染骨肉瘤细胞系MG-63，筛选稳定表达的克隆，倒置显微镜观察各组细胞形态学变化，RT-PCR、Weston-blot方法检测转染后Survivin mRNA及蛋白的表达，噻唑蓝（MTT）法、克隆形成实验检测细胞的增殖情况，吖啶橙荧光染色法观察细胞凋亡情况。[结果]转染后MG-63细胞Survivin基因mRNA水平和蛋白表达显著下降，其抑制率分别为85．08％和81．14％；细胞增殖受到显著抑制，培养48h后与空白组比较，抑制率达63．4l％；吖啶橙染色显示转染组细胞出现明显核碎裂等凋亡改变，转染组凋亡率为24．54％。[结论]靶向Survivin基因的siRNA表达载体可以显著抑制骨肉瘤细胞增殖，促进细胞凋亡。     

肺癌抑癌基因1对人骨肉瘤细胞株MG63生长和增殖的影响

目的 观察肺癌抑癌基因1(TSLC1)对人骨肉瘤细胞株MG63的生长和增殖能力的影响.方法 将稳定表达TSLC1的人骨肉瘤MG63细胞株M8T设为研究对象,转染空载体的骨肉瘤MG63细胞株M8P设为对照组,人骨肉瘤细胞株MG63设为空白组.噻唑蓝(MTT)法检测M8T细胞增殖;FACSort流式细胞仪检测细胞周期变化及细胞凋亡;将2×107个瘤细胞皮下注射裸鼠,观察体内成瘤的影响.结果 稳定转染TSLCl的实验组M8T细胞株与对照组及空白组细胞比较,其细胞增殖能力下降,生长速度明显受到抑制;M8T细胞G0-G1期细胞数为(63.76 ±2.78)％,生长周期出现了G0～G1期阻滞,细胞凋亡总数为(28.45 ±0.65)个,显著增加(P＜0.01);裸鼠皮下成瘤于皮下注射后3周开始形成.结论 TSLC1能明显抑制骨肉瘤MG63细胞的生长和增殖.     

LC调节人成骨样MG-63细胞表达OPG、RANKL分子机制的研究

目的 探讨大黄酸哌嗪雌酚酮（rhein-piperizinyl-estrone,命名为 LC）调节人成骨样MG-63细胞表达骨保护素(osteoprotegerin, OPG)、NF-κB激活受体配体(receptor activator of NF-κB ligand, RANKL)的分子机制。方法 在原工作基础上,选择兼有两种雌激素受体(estrogen receptor, ER)亚型表达的人成骨样MG-63细胞为研究模型,采用RT-PCR、免疫印迹及小RNA干扰等技术,探讨LC对人成骨细胞产生的骨吸收调节因子OPG、RANKL表达的作用及作用机制。结果 LC可上调MG-63细胞OPG表达及下调RANKL表达,该作用可被纯ER阻断剂ICI 182,780完全阻断,应用小RNA干扰技术进一步证实LC对成骨细胞OPG、RANKL表达的调节作用主要是由ERα介导的。结论 LC调节成骨细胞表达OPG、RANKL是经ER途径、主要是由ERα介导的。     

肼苯哒嗪对人骨肉瘤细胞的生长抑制及对WWOX基因的调控作用研究

 目的 通过观察肼苯哒嗪、5’-氮杂-2’-脱氧胞嘧啶核苷酸(5’-aza- 2’-deoxycytidine,5-Aza-CdR)及其联合使用对人成骨肉瘤细胞MG-63的生长抑制作用,并检测对骨肉瘤细胞中WWOX基因表达的调控作用,初步明确肼苯哒嗪对骨肉瘤细胞的作用机制。方法 取对数生长期的人骨肉瘤细胞株MG-63制成细胞悬液,计数板计数5×10⁴个/ml,加入96孔板。分为肼苯哒嗪组(药物浓度为0.1、l.0、10 μmol／L)、5-Aza-CdR组(药物剂量为5、10、20 μmol／L)、肼苯哒嗪联合5-Aza-CdR组(药物剂量为0.1　μmo/L+5 μmo/L、l.0 μlmol／L+10 μlmol／L、10 μmol／L+20 μmol／L)及对照组(培养基)。噻唑蓝(MTT)比色法检测药物对MG-63细胞生长抑制作用;流式细胞仪检测药物对细胞周期分布作用及凋亡影响; Real-Time PCR 技术检测WWOX mRNA表达改变情况;Western-blot检测药物处理后各组细胞中WWOX蛋白表达水平。结果 肼苯哒嗪、5-Aza-CdR及其联合应用对MG-63细胞的增殖均有明显抑制作用,且呈浓度依赖性并与作用时间相关;联合应用较单用抑制作用明显增强,且各组差异有统计学意义。肼苯哒嗪、5-Aza-CdR可诱导骨肉瘤MG-63细胞凋亡,联合应用时诱导凋亡作用加强。肼苯哒嗪、5-Aza-CdR对骨肉瘤MG-63细胞中WWOX 基因表达有促进作用,联合作用使WWOX表达明显增强。结论 肼苯哒嗪可明显抑制骨肉瘤细胞的增殖并诱导其凋亡,并促进WWOX基因的表达,其作用机制可能为肼苯哒嗪能够使抑癌基因WWOX基因甲基化状态逆转,表达增加,从而抑制MG-63细胞的增殖。     

Notch1 siRNA对乏氧环境骨肉瘤细胞MG-63增殖及周期的影响

[目的]探讨Notch1 siRNA对乏氧环境人骨肉瘤细胞MG-63细胞增殖和周期的影响。[方法]将骨肉瘤细胞株MG-63细胞置于乏氧(37℃、1%O2、5%CO2)环境下培养作为实验组,以正常氧环境(37℃、21%O2、5%CO2)下培养作为对照组,培养72 h,应用MTT方法检测不同时间乏氧培养对MG-63细胞增殖的影响;采用Notch siRNA转染乏氧环境中的MG-63细胞,MTT方法检测细胞增殖变化;流式细胞术检测细胞周期的变化;Western blot检测细胞HIF-1a、Notch1蛋白表达变化。[结果]乏氧培养可促进MG-63细胞增殖,48 h常氧及乏氧对细胞增殖的作用可见明显差异(2.164±0.075 vs 1.421±0.086)(P<0.01)。流式细胞分析显示实验组、对照组MG-63细胞培养48 h G1/G2期细胞比例分别为(41.79±3.25)%和(53.87±2.31)%(P<0.05),乏氧可以促进细胞周期进展,Notch1 siRNA有效下调乏氧MG-63细胞Notch1蛋白表达,Notchl siRNA作用48 h后乏氧环境MG-63细胞周期阻滞于G1/G2期。Western-blot结果显示乏氧环境下MG-63细胞HIF-1a、Notch1蛋白表达增高。[结论]乏氧环境能通过促进MG-63细胞周期进展,从而明显促进细胞增殖,阻断Notch可逆转乏氧对MG-63细胞促增殖作用,提示Notchl是治疗骨肉瘤的有效分子靶点。     

Effect of transforming growth factor beta on parathyroid hormone receptor binding and cAMP formation in rat osteosarcoma cells.

Transforming growth factor beta (TGF-beta) is now recognized as an important growth regulator and modulator in bone, where it apparently acts in an autocrine or paracrine fashion. In an effort to help elucidate how TGF-beta may interact with parathyroid hormone (PTH) to influence bone turnover, we examined the idea that TGF-beta might alter the number or affinity of PTH receptors in osteoblastic bone cells, PTH receptor binding was assessed in cultured ROS 17/2.8 cells using [125I]PTHrP-(1-34) as labeled ligand. Specific binding to intact cells was measured in the presence of up to 1 microM unlabeled rPTH-(1-34), and cAMP in cell extracts was determined by RIA. Incubation of ROS cells with 2 ng/ml of TGF-beta for the maximally effective time of 3 days increased the number of PTH binding sites (Bmax) by 47 +/- 13%, with no change in the KD (3 nM). TGF-beta also increased the intracellular cAMP response to 0.3 nM rPTH-(1-34) (ED50) by 53 +/- 22%. Both effects were dose dependent, with 1-4 ng/ml of TGF-beta producing maximal effects, and both effects were blocked by the protein synthesis inhibitor cycloheximide (2-5 microM). Since TGF-beta induced comparable increases in both PTH binding and cAMP formation, the findings suggest that TGF-beta can increase the number of functional PTH receptors in cultured ROS 17/2.8 cells. This effect may reflect an action of TGF-beta to slow replication and promote differentiated functions in these cells.     

Interaction of epidermal growth factor and transforming growth factor beta in human prostatic epithelial cells in culture.

The present study was conducted to study the interaction between epidermal growth factor (EGF) and transforming growth factor-beta (TGF-beta) in benign human prostatic epithelial cells in culture. Primary cultures of human prostatic epithelial cells were grown in complete WAJC, which consisted of WAJC-404 medium and, in addition to other defined additives, EGF and bovine pituitary extract (BPE). Incomplete WAJC contained the same composition except EGF and BPE were deleted. TGF-beta was added into media at concentrations of 0, 0.1, and 1.0 ng/ml. When cells were grown in complete WAJC, they proliferated rapidly. Cell proliferation was greatly suppressed when incomplete WAJC was used. Addition of TGF-beta to these cultures caused a significant reduction in the final cell number when either complete WAJC or incomplete WAJC was used. In additional experiments, cells were prelabeled with 3H-thymidine for 72 hr prior to treatment with TGF-beta. The percentage of radioactivity released into the medium at the end of a 6-day culture was used as an indication of the extent of cell death. Trypan blue exclusion test was also used to assess the extent of cell death. Addition of TGF-beta into complete WAJC did not significantly affect the extent of cell death beyond what was considered as the result of normal cellular turnover. Addition of TGF-beta into incomplete WAJC, however, caused a significant increase in the percent of cell death in the culture. These results demonstrated an interaction between EGF and TGF-beta in proliferation and cell death in human prostatic epithelia in culture. In the presence of EGF alone in the culture medium, prostatic epithelial cells were stimulated to proliferate. The rate of proliferation was greatly diminished when EGF was deleted from the medium or when TGF-beta was added in the presence of EGF. Finally, cell death was induced when TGF-beta was added into the medium in the absence of EGF.     

成人成骨细胞和MG-63细胞株孕激素受体的表达

目的 观察成人成骨细胞和MG-63细胞株孕激素受体(progesterone receptor，PR)亚型表达的情况。方法 用改良胶原酶消化法从正常成人松质骨中分离成骨细胞，观察细胞形态，钙钴法行碱性磷酸酶染色，Van Gieson法行Ⅰ型胶原染色，茜素红行矿化结节染色；半定量RT-PCR检测骨钙素和PR亚型mRNA表达；Western blot测定PR蛋白质表达。结果 所分离培养的细胞具有成骨细胞的形态特征，保持了其在体内的功能；人成骨细胞和MG-63细胞株均表达PRA、PRB mRNA和蛋白质。结论 人成骨细胞和MG-63细胞株可能受孕激素的影响。