MTT分析法检测沙立度胺对乳腺癌细胞增殖的作用

目的观察沙立度胺对乳腺癌细胞MCF-7和MDA—MB-231增殖的抑制作用。方法设置溶剂对照及沙立度胺不同浓度组、时间组，采用四甲基偶氮唑蓝（MTT）法检测各组细胞存活和生长情况，分析量效关系、时效关系。结果①在10—200μg／ml浓度范围，沙立度胺对MCF-7和MDA—MB-231细胞增殖均有抑制作用。在药物作用48h后各组的细胞抑制率均达到高峰，48h时又以100μg／ml浓度组抑制率最高。结论在一定浓度范围，沙立度胺对MCF-7和MDA—MB-231细胞增殖具有抑制作用。     

4种中药制剂对人肺癌A549细胞增殖的影响

目的　研究人肺癌A5 49细胞和乳腺癌MCF7细胞对市售 4种中药制剂 (斑蟊酸钠、苦参素、华蟾素和川芎素 )的敏感性 ,以及川芎素影响肺癌A5 49细胞增殖的可能机制。方法　采用MTT法测定药物对细胞增殖的抑制率和药物间的协同抑制作用 ;流式细胞法测定细胞周期。结果　4种中药对乳腺癌MCF7细胞的增殖均有不同程度的抑制作用 ,但只有川芎素可明显抑制肺癌A5 49细胞的增殖 ;川芎素与 3种化疗药物联合对A5 49细胞有协同作用 ;川芎素可诱导A5 49细胞凋亡。结论　斑蟊酸钠、苦参素和华蟾素对不同肿瘤细胞的抑制效果差异很大 ;川芎素不仅有抑制肿瘤细胞增殖的作用 ,还与化疗药物有协同效果 ;川芎素抑制A5 49细胞增殖的机制与其诱导细胞凋亡有关。     

连花清瘟胶囊对乳腺癌MCF－7细胞增殖抑制与诱导凋亡作用的观察

目的：研究连花清瘟胶囊抗肿瘤的药理作用。方法应用MTT法检测连花清瘟胶囊对乳腺癌 MCF－7细胞增殖的抑制程度,AO／EB双荧光染色法检测细胞凋亡形态,DNA琼脂糖凝胶电泳观察细胞 DNA 片段。结果在浓度为200～2667μg? mL －1内,连花清瘟胶囊对乳腺癌MCF－7细胞的增殖有显著的抑制作用,其抑制作用随药物浓度的增加而增强,对MCF－7细胞增殖抑制率由10．50％增加到43．83％,与对照组比较呈显著差异性（P＜0．05vs正常组）。连花清瘟胶囊明显影响乳腺癌MCF－7细胞的染色质,发生固缩等凋亡形态的变化及细胞凋亡的 DNA梯带形状。结论连花清瘟胶囊具有抑制乳腺癌细胞增殖和诱导其凋亡的抗肿瘤的药理作用。     

黄芩素对人胰腺癌细胞增殖与凋亡的影响

摘 要 目的：探讨黄芩素对人胰腺癌细胞增殖与凋亡的影响。方法: 人胰腺癌细胞株BxPC 3和PANC 1经不同浓度（0,50,75,100 μmol·L-1）的黄芩素处理后,通过CCK 8检测、划痕愈合实验、细胞迁移、侵袭实验、显微镜观察、Real time qPCR 检测增殖和凋亡相关基因的影响等方法,观察黄芩素在胰腺癌细胞增殖、迁移、侵袭以及凋亡、基因表达的影响。结果: 与空白对照组比较,黄芩素能够显著抑制胰腺癌细胞BxPC 3和PANC 1的增殖,并且随着浓度的加大,对BxPC 3和PANC 1增殖的抑制作用在加强（P＜0.01）;且黄芩素对两种胰腺癌细胞系的作用效果与临床常用抗癌药吉西他滨（2 μmol·L-1）的作用效果相似。黄芩素能显著抑制胰腺癌细胞的迁移和侵袭,诱导癌细胞的凋亡,诱导胰腺癌细胞自噬;经过黄芩素处理的癌细胞,细胞周期相关基因和抗凋亡基因（cyclinD1、cyclinE、cyclinA和Bcl 2）表达水平下降,而细胞凋亡相关基因（caspase 3和Bax）的表达水平上调明显。结论: 黄芩素能有效抑制胰腺癌细胞BxPC 3和PANC 1的增殖、迁移和侵袭,并且可以通过凋亡和自噬诱导细胞死亡。     

黄芩素对miR-183/Kif2a介导乳腺癌细胞增殖和凋亡的机制研究

目的探讨黄芩素对miR-183/Kif2a介导的乳腺癌MDA-MB-231细胞增殖和凋亡的作用及可能机制。方法噻唑蓝(methylthiazolyldiphenyl-tetrazolium bromide,MTT)法检测黄芩素对乳腺癌细胞增殖活性的影响,实时荧光定量聚合酶链式反应法检测细胞中miR-183和Kif2a信使RNA的表达,在线靶基因预测软件预测miR-183和Kif2a的靶向关系。转染miR-183抑制剂和pcDNA 3.1-Kif2a,黄芩素处理细胞后,MTT法检测细胞增殖活性,流式细胞术测定细胞凋亡,蛋白质免疫印记技术(western blot,WB)检测细胞中G1/S-特异性周期蛋白-D1(Cyclin D1)、p21、半胱氨酸天冬氨酸蛋白酶3(C-Caspase-3)及半胱氨酸天冬氨酸蛋白酶9(C-Caspase-9)蛋白表达。结果经黄芩素处理后的乳腺癌细胞增殖能力下降(P<0.05),细胞中miR-183水平升高(P<0.05),Kif2a信使RNA水平降低(P<0.05)。miR-183靶向结合Kif2a并负向调控Kif2a的表达(P<0.05)。miR-183抑制剂或pcDNA 3.1-Kif2a转染可以逆转黄芩素对乳腺癌增殖、凋亡以及C-Caspase-3、C-Caspase-9、Cyclin D1、p21蛋白表达的作用。结论黄芩素通过miR-183/Kif2a调控乳腺癌细胞增殖和凋亡。     

尿多酸肽对乳腺癌细胞增殖的抑制作用

目的:研究尿多酸肽(CDAII)对乳腺癌细胞增殖的抑制作用。方法:将CDAII与乳腺癌细胞株MCF7和MDAMB231进行体外培养,观察CDAII对乳腺癌细胞生长曲线及形态学等方面的影响。结果:CDAII对两种不同生物特征的乳腺癌细胞株ER MCF7细胞和ER-MDAMB231细胞生长和增殖均有不同程度的抑制作用,而且其生长抑制作用在一定时间和剂量范围内,呈剂量依赖性;形态上,加CDAII培养后,细胞体积增大,生长密度稀疏,细胞间隙拉宽,胞质增多,核质比例下降,核仁小而少,细胞固缩、退变。结论:CDAII可抑制不同生物学特性的两株乳腺癌细胞的生长和增殖。     

汉黄芩素体外抗人喉癌 Hep2细胞增殖、凋亡和侵袭的作用及机制研究

目的：研究汉黄芩素对人喉癌Hep-2细胞增殖、凋亡及侵袭能力的影响,并探讨其作用机制。方法运用CCK-8检测汉黄芩素对人喉癌Hep-2细胞增殖活性的影响。运用流式细胞仪检测汉黄芩素对人喉癌Hep-2细胞凋亡的影响。运用Hoechst染色法检测汉黄芩素对人喉癌Hep-2细胞核形态变化的影响。运用transwell侵袭实验比较汉黄芩素对人喉癌Hep-2细胞侵袭能力的影响。运用Western blot检测汉黄芩素对人喉癌Hep-2细胞hTERT、Bcl-2、Bax蛋白表达水平的影响。结果 CCK-8法发现汉黄芩素能抑制人喉癌Hep-2细胞增殖,其作用呈浓度依赖性。流式细胞术分析发现汉黄芩素能诱导人喉癌Hep-2细胞发生凋亡。 Hoechst染色发现汉黄芩素能诱导人喉癌Hep-2细胞核形态变化。 Transwell实验发现汉黄芩素能抑制人喉癌Hep-2细胞的体外侵袭能力。 Western blot 检测发现测汉黄芩素能有效降低人喉癌Hep-2细胞hTERT、Bcl-2蛋白表达水平以及增加Bax蛋白表达水平（ P ＜0．05）。结论汉黄芩素在体外能够有效抑制人喉癌Hep-2细胞增殖,诱导细胞凋亡,同时抑制喉癌细胞的体外侵袭能力。其作用可能与调控Bcl-2蛋白家族及hTERT蛋白表达水平相关。     

5，7-DMF诱导14-3-3σ基因甲基化促进乳腺癌MDA-MB-453 细胞凋亡的实验研究

目的探讨5,7-二甲氧基黄酮（5,7-DMF）对人乳腺癌细胞凋亡的影响及其可能机制。方法体外培养乳腺癌MDA—MB-453、MCF-7细胞和永生化人乳腺上皮HBL-100细胞,经5,7-DMF处理后,通过MTT法测定细胞活力：碘化丙啶（PI）染色流式细胞术（FCM）分析细胞凋亡率;甲基化特异性聚合酶链反应（MSP）检测14—3—3σ基因甲基化状态：Westem blotting分析14—3—3σ蛋白表达水平。结果5,7-DMF对MDA—MB-453细胞活性的抑制作用最强;不同浓度（5、10和20μmol．L^-1）5,7-DMF作用48小时后,可显著诱导MDA—MB-453细胞凋亡,其细胞内14—3—3σ基因甲基化水平显著升高,而14—3—3σ蛋白表达水平显著降低。结论5,7-DMF可诱导乳腺癌MDA—MB-453细胞凋亡,其机制可能与促进14—3—3σ基因的甲基化和降低其蛋白表达有关。     

阿霉素诱导小鼠MCF-7乳腺癌细胞凋亡和抑制增殖的体内实验研究

目的:探讨阿霉素对荷瘤鼠MCF7乳腺癌细胞凋亡和增殖的影响。方法:建立小鼠MCF7乳腺癌细胞模型,用TUNEL法和免疫组化法检测阿霉素作用下MCF7乳腺癌细胞的凋亡和PCNA表达的变化。结果:1.25mg·kg-1阿霉素的抑瘤率为43%。MCF7乳腺癌细胞的凋亡指数为1.93%,较荷瘤对照组的1.11%明显升高(P<0.05)。增殖指数为35.75%,较荷瘤对照组的56.38%明显下降(P<0.01)。结论:阿霉素有诱导小鼠MCF7乳腺癌细胞凋亡和抑制其增殖的作用。     

杠柳苷元抑制人乳腺癌细胞增殖作用的研究

目的 观察杠柳苷元(periplogenin)对人乳腺癌细胞MCF7的抑制作用并考察其抑制作用的机理.方法 使用四氮唑盐(MTT)法测定杠柳苷元对MCF7细胞的增殖抑制效果,并使用蛋白免疫印迹法测定其中凋亡蛋白的表达.结果 杠柳苷元对MCF7细胞起到了明显的抑制作用,其抑制作用呈剂量依赖性,蛋白免疫印迹法也观察到杠柳苷元促进MCF7细胞内凋亡相关蛋白的表达,其表达呈时间依赖性.结论 杠柳苷元具有显著的体外抑制MCF7细胞增殖的作用,其抑制作用是通过促进MCF7细胞凋亡而发挥的.     

Baicalein inhibits the migration and invasive properties of human hepatoma cells

Flavonoids have been demonstrated to exert health benefits in humans. We investigated whether the flavonoid baicalein would inhibit the adhesion, migration, invasion, and growth of human hepatoma cell lines, and we also investigated its mechanism of action. The separate effects of baicalein and baicalin on the viability of HA22T/VGH and SK-Hep1 cells were investigated for 24 h. To evaluate their invasive properties, cells were incubated on matrigel-coated transwell membranes in the presence or absence of baicalein. We examined the effect of baicalein on the adhesion of cells, on the activation of matrix metalloproteinases (MMPs), protein kinase C (PKC), and p38 mitogen-activated protein kinase (MAPK), and on tumor growth in vivo. We observed that baicalein suppresses hepatoma cell growth by 55%, baicalein-treated cells showed lower levels of migration than untreated cells, and cell invasion was significantly reduced to 28%. Incubation of hepatoma cells with baicalein also significantly inhibited cell adhesion to matrigel, collagen I, and gelatin-coated substrate. Baicalein also decreased the gelatinolytic activities of the matrix metalloproteinases MMP-2, MMP-9, and uPA, decreased p50 and p65 nuclear translocation, and decreased phosphorylated I-kappa-B (IKB)-β. In addition, baicalein reduced the phosphorylation levels of PKCα and p38 proteins, which regulate invasion in poorly differentiated hepatoma cells. Finally, when SK-Hep1 cells were grown as xenografts in nude mice, intraperitoneal (i.p.) injection of baicalein induced a significant dose-dependent decrease in tumor growth. These results demonstrate the anticancer properties of baicalein, which include the inhibition of adhesion, invasion, migration, and proliferation of human hepatoma cells in vivo.     

Baicalein, a flavonoid extracted from a methanolic extract of Oroxylum indicum inhibits proliferation of a cancer cell line in vitro via induction of apoptosis

A methanolic extract of the fruits of Oroxylum indicum, which is widely used in traditional Chinese herbal medicine for its anti-inflammatory, anti-pyretic and anti-hypersensitivity effects, inhibited in vitro proliferation of HL-60 cells. The flavonoid baicalein was found as an active component in the extract. Analysis of freeze-dried fruits of the plant indicated that this component comprised about 4% of the material by dry weight. In this study, we investigated the in vitro effects of baicalein on the viability and induction of apoptosis in the HL-60 cell line. The cell viability after treating with baicalein for 24 h was quantified by counting viable cells using trypan blue staining. The results showed that baicalein caused a 50% inhibition of HL-60 cells at concentrations of 25-30 microM. The inhibition of proliferation of HL-60 cells due to 36-48 h exposure to 10 or 20 microM baicalein was associated with the accumulation of cells at S or G2M phases. However, proliferation inhibition at a higher dose may be associated with induction by apoptosis, as evidenced by the typical nuclear fragmentation using DNA fragmentation assay and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL). The results indicate that baicalein has anti-tumor effects on human cancer cells, and Oroxylum indicum extract could be used in supplementary cancer therapy.     

Inhibition of 12-lipoxygenase during baicalein-induced human lung nonsmall carcinoma H460 cell apoptosis.

Baicalein is known as a 12-lipoxygenase (12-LOX) inhibitor. The 12-LOX is found to be involved in the progression of human cancers and the inhibitor of 12-LOX offers a target for the prevention cancer. We demonstrated the inhibitory effect of baicalein on the gene and protein expression of 12-LOX in H460 human lung nonsmall carcinoma cell line. Treatment of baicalein inhibited the growth of H460 cells in a dose-dependent manner. Following 24h exposure to 50muM baicalein, cell cycle analysis revealed an increase in the cell population in S-phase. During the S-phase arrest, baicalein decreased the protein levels of cdk1 and cyclin B1, which are the regulating proteins of S-phase transition to G2/M-phase, in this study. Furthermore, baicalein induced the most of H460 cell apoptosis after treatment for 48h. H460 cells formed vesicles and apoptotic body, and then floated after treatment with baicalein. Baicalein-induced H460 cell apoptosis was confirmed by DNA condensation and fragmentation. Baicalein-induced apoptosis were also accompanied by decreasing in Bcl-2 and proform of caspase-3 and increasing p53 and Bax protein levels. Pretreatment with a specific caspase-3 inhibitor, Ac-DEVD-CHO, partially reduced baicalein-induced cell death, indicating baicalein induces apoptosis is partially dependent on caspase-3 pathway in H460 cells. These data suggest that baicalein, a 12-LOX inhibitor, inhibits the proliferation of H460 cells via S-phase arrest and induces apoptosis in association with the regulation of molecules in the cell cycle and apoptosis-related proteins.     

Different effects of baicalein, baicalin and wogonin on mitochondrial function, glutathione content and cell cycle progression in human hepatoma cell lines

The effects of the flavonoids from Scutellaria baicalensis Georgi (baicalein, baicalin and wogonin) in cultured human hepatoma cells (Hep G2, Hep 3B and SK-Hep1) were compared by MTT assay and flow cytometry. All three flavonoids dose-dependently decreased the cell viabilities accompanying the collapse of mitochondrial membrane potential and the depletion of glutathione content. However, the influence of baicalein, baicalin or wogonin on cell cycle progression was different. All three flavonoids resulted in prominent increase of G2/M population in Hep G2 cells, whereas an accumulation of sub G1 (hypoploid) peak in Hep 3B cells was observed. In SK-Hep1 cells, baicalein and baicalin resulted in dramatic boost in hypoploid peak, but wogonin made mainly in G1 phase accumulation. These data, together with the previous findings in other hepatoma cell lines, suggest that baicalein, baicalin and wogonin might be effective candidates for inducing apoptosis or inhibiting proliferation in various human hepatoma cell lines.     

The lipoxygenase inhibitor, baicalein, modulates cell adhesion and migration by up-regulation of integrins and vinculin in rat heart endothelial cells

BACKGROUND AND PURPOSE: Endothelial cell proliferation, migration and adhesion are necessary for the formation of new blood vessels. We reported previously that baicalein strongly inhibited proliferation of rat heart endothelial cells and here we assess effects on migration and adhesion of these cells. EXPERIMENTAL APPROACH: Effects of baicalein on endothelial migration and adhesion were determined by in vitro wound assays and in modified Boyden chambers. Protein expression and subcellular distribution in rat heart endothelial cells were analysed by immunoblots and immunofluorescence staining. RESULTS: Pretreatment with baicalein for 48 h resulted in a concentration-dependent inhibition of endothelial migration, with an IC(50) of approximately 20 microM. Adhesion assays revealed that baicalein stimulated endothelial cell adhesion to fibronectin and vitronectin, effects blocked by the synthetic peptide Arg-Gly-Asp (RGD). Moreover, treatment with a blocking antibody against integrin alpha5beta1 drastically attenuated baicalein-mediated endothelial adhesion to fibronectin, but not to vitronectin. Furthermore, baicalein-mediated anti-migration effect and adhesion promotion could be partially reversed by the addition of 12(S)-hydroxyeicosatetraenoic acid (12(S)-HETE). Western blot analysis indicated that baicalein increased expression levels of integrin-alpha5beta1, -alphavbeta3 and vinculin proteins. Immunofluorescence staining showed that baicalein induced a marked reorganization of actin stress fibres and the recruitment of vinculin and integrins to focal adhesion plaques, with consequently increased formation of focal adhesion contacts. CONCLUSIONS AND IMPLICATIONS: Baicalein markedly inhibited the migration and enhanced the adhesion of rat heart endothelial cells, possibly by up-regulation of the integrins (alpha5beta1 and alphavbeta3) and vinculin and by promotion of actin reorganization and focal adhesion contact formation.     

黄芩素联合紫杉醇对人肺癌细胞的生长抑制作用

目的 探讨黄芩素联合紫杉醇对人肺癌细胞株QG-56的影响。方法 以不同浓度的黄芩素、紫杉醇分别组成单药组和联合用药组,另设不加药的空白对照组,分别作用于QG-56细胞24,48,72和96 h,观察细胞数量和形态的变化,MTT法检测各组对QG-56细胞的增殖抑制作用,用流式细胞仪检测各组细胞凋亡率的改变。结果 不同浓度的各实验组作用后细胞数量明显减少、形态不规则,部分细胞核固缩和胞质减少,而对照组细胞生长状态良好。黄芩素、紫杉醇单用与联用均能抑制QG-56细胞增殖,呈剂量-时间依赖效应,联用组细胞抑制率较单药组明显增高,差异有统计学意义（P〈0.05）。黄芩素、紫杉醇单用与联用均能诱导QG-56细胞凋亡,联合组更为明显（P〈0.05）。结论 黄芩素可显著抑制人肺癌细胞株QG-56细胞生长,并能有效增强紫杉醇对人肺癌QG-56细胞的增殖抑制作用;两者具有协同作用。     

黄芩苷元选择性诱导人白血病K562细胞凋亡

目的研究黄芩苷元诱导人白血病细胞凋亡的作用及机理。方法MTT法测细胞毒活性，Hoechst 33258荧光染色法观察凋亡小体形成，流式细胞仪Annexin V FITC-PI法检测细胞凋亡发生率，PI染色法检测凋亡峰及细胞周期，同时流式细胞仪检测细胞Bcl-2，Fas和Caspase 3蛋白表达情况。结果黄芩苷元能选择性抑制人白血病K562细胞生长且呈浓度依赖关系，并能诱导细胞凋亡，细胞增殖被阻滞于S期；同时细胞Fas和Caspase 3蛋白表达增高，而Bcl-2蛋白表达不变。结论黄芩苷元能激活Caspase 3蛋白表达，诱导人白血病K562细胞凋亡且呈时效量效关系，此作用与Fas蛋白表达上调有关，与Bcl-2蛋白表达无关。     

Baicalein induces G1 arrest in oral cancer cells by enhancing the degradation of cyclin D1 and activating AhR to decrease Rb phosphorylation

Baicalein is a flavonoid, known to have anti-inflammatory and anti-cancer effects. As an aryl hydrocarbon receptor (AhR) ligand, baicalein at high concentrations blocks AhR-mediated dioxin toxicity. Because AhR had been reported to play a role in regulating the cell cycle, we suspected that the anti-cancer effect of baicalein is associated with AhR. This study investigated the molecular mechanism involved in the anti-cancer effect of baicalein in oral cancer cells HSC-3, including whether such effect would be AhR-mediated. Results revealed that baicalein inhibited cell proliferation and increased AhR activity in a dose-dependent manner. Cell cycle was arrested at the G1 phase and the expression of CDK4, cyclin D1, and phosphorylated retinoblastoma (pRb) was decreased. When the AhR was suppressed by siRNA, the reduction of pRb was partially reversed, accompanied by a decrease of cell population at G1 phase and an increase at S phase, while the reduction of cyclin D1 and CDK4 did not change. This finding suggests that the baicalein activation of AhR is indeed associated with the reduction of pRb, but is independent of the reduction of cyclin D1 and CDK4. When cells were pre-treated with LiCl, the inhibitor of GSK-3β, the decrease of cyclin D1 was blocked and the reduction of pRb was recovered. The data indicates that in HSC-3 the reduction of pRb is both mediated by baicalein through activation of AhR and facilitation of cyclin D1 degradation, which causes cell cycle arrest at the G1 phase, and results in the inhibition of cell proliferation.     

Baicalein induces a dual growth arrest by modulating multiple cell cycle regulatory molecules

Baicalein, a flavonoid present in the root of Scutellaria baicalensis Georgi, has been reported to inhibit cell proliferation in several types of cells. In this study, the effect of baicalein on cell growth and the mechanism of growth modulation were examined in primary cultured rat heart endothelial cells. Here, we report that treatment with 100-microM baicalein caused an almost complete inhibition of cell proliferation after 5 days of incubation. Baicalein mediated G1 and G2 growth arrest accompanied by the down-regulation of cyclin D2, cyclin A, cyclin-dependent kinase 1 (Cdk1) and cyclin-dependent kinase 2 (Cdk2), and up-regulation of p15(Ink4B), p21(CIP1/Waf1), p53 and cyclin E. Evaluation of the kinase activity of cyclin-Cdk complexes showed that baicalein decreased Cdk1, Cdk2, cyclin D2 and cyclin A expression in endothelial cells, leading to markedly reduced Cdk/cyclin-associated kinase activities. These results suggest that baicalein inhibits the proliferation of rat heart endothelial cells via G1 and G2 arrest in association with the down-regulation of the expression and function of Cdk1, Cdk2, cyclin D2 and cyclin A proteins, and up-regulation of cyclin E, p15(Ink4B), p53 and p21(CIP1/Waf1).     

Strong antiproliferative effects of baicalein in cultured rat hepatic stellate cells.

Recently, antifibrogenetic effects of Sho-saiko-to, a traditional herbal medicine in Japan, have been shown in experimental hepatic fibrosis, and flavonoids in Sho-saiko-to are suspected as active ingredients. Thus, we evaluated the effects of baicalein, a major flavonoid in Sho-saiko-to, on proliferation and protein synthesis in cultured rat hepatic stellate cells. Baicalein decreased [3H]thymidine incorporation in cells stimulated with platelet-derived growth factor-B subunit homodimer (PDGF-BB) in a concentration-dependent manner (approximate ED50<10 microM, P<0.0001), and the decrease observed with 10 microM baicalein was greater than those observed with 5 microM retinol or 500 microM 3-isobutyl-1-methylxanthine (IBMX). Baicalein consistently decreased [3H]thymidine incorporation and cell number in cells stimulated with fetal calf serum (ED50<10 microM, P<0.0001), and moderately suppressed [3H]leucine and [3H]proline incorporation (P<0.0001). These results demonstrate the strong antiproliferative effect of baicalein in hepatic stellate cells, showing the possibility of baicalein as an antifibrogenetic drug for hepatic fibrosis.