表达反义细胞周期蛋白cyclinD1载体对胰腺癌细胞生长和凋亡的影响

目的观察反义细胞周期蛋白ｃｙｃｌｉｎＤ１对胰腺癌细胞生长的影响。方法采用Ｓｏｕｔｈｅｒｎｂｌｏｔ和Ｎｏｒｔｈｅｒｎｂｌｏｔ方法检测了５株人胰腺癌细胞系中ｃｙｃｌｉｎＤ１的扩增及表达情况，发现ＰＣ７细胞中基因有扩增及过度表达。我们构建了反义（ＡＳ）ｃｙｃｌｉｎＤ１的表达载体，采用ｌｉｐｏｆｅｃｔｉｎ转染方法转染ＰＣ７细胞，获得转化细胞系ＰＣ７／ＡＳｃｙｃｌｉｎＤ１。经Ｎｏｒｔｈｅｒｎｂｌｏｔ、Ｗｅｓｔｅｒｎｂｌｏｔ检测转化细胞系，表明有外源反义ｃｙｃｌｉｎＤ１的表达，而内源性ｃｙｃｌｉｎＤ１ｍＲＮＡ表达及蛋白合成下调，并进行了细胞凋亡分析。结果转化细胞系细胞恶性生物学行为及表型部分逆转，细胞生长速度、ＤＮＡ合成及细胞增殖和代谢能力均明显下降，软琼脂集落形成能力减低。流式细胞术分析发现细胞被阻滞于Ｇ１期，ＤＮＡ凝胶电泳、原位凋亡检测发现凋亡细胞增多。结论通过反义ＲＮＡ技术，下调在细胞周期调控中起重要作用的ｃｙｃｌｉｎＤ１的表达，可使胰腺癌细胞恶性表型部分逆转。     

周期蛋白E在细胞周期调节中的作用

ｃｙｃｌｉｎ Ｅ是Ｇ１期的周期蛋白,基因定位于１９ｑ１２－１３,参与细胞周期的调节及肿瘤的发生。ｃｙｃｌｉｎ Ｅ与ＣＤＫ２结合在Ｇ１期末发挥作用,促进细胞进入Ｓ期。ｃｙｃｌｉｎ Ｅ的过量表达通过对ｐＲＢ及其它低物的磷酸化、释放出转录因子进而启动ＤＮＡ的合成,加速细胞的Ｇ１期进程。ｐ２１、ｐ２７及ＴＧＦ－β通过对ｃｙｃｌｉｎ Ｅ－ＣＤＫ２活性的抑制而减缓Ｇ１期的进程。ｃｙｃｌｉｎ Ｅ是周期进程的基本     

反义周期蛋白B1基因转染HT29细胞后若干细胞增殖调控相关基因表达的变化

用基因重组技术将插入有反义周期蛋白Ｂ１（ｃｙｃｌｉｎＢ１）基因ｐＸＪ４１－ｎｅｏ质粒，转染人结肠腺癌ＨＴ２９，获得了ＨＴＢ１细胞株。ＨＴＢ１细胞显示出ｃｙｃｌｉｎＢ１ｍＲＮＡ明显的表达抑制。为了探讨ＨＴＢ１细胞生长变慢和它的增殖相关基因表达之间的关系，我们用异硫氰酸胍－酚一步法提取ＨＴＢ１和ＨＴ２９细胞的总ＲＮＡ，并用一些有关的基因探针进行杂交实验。其结果表明：ｃ－ｍｙｃ和ＣＤＫ４在ＨＴＢ１中的表达低于在ＨＴ２９中的表达；而另一方面，ｐ５３、Ｒｂ、ＴＧＦβ和ｃｙｃｌｉｎＤ３在ＨＴＢ１细胞中的表达高于对照组。而ｃｄｃ２基因表达二者维持相似水平。根据研究结果我们发现，转染有反义ｃｙｃｌｉｎＢ１基因的ＨＴＢ１细胞在一组正、负调节基因的协同作用下，导致细胞周期运转的变化。     

钙调素拮抗剂对HeLa细胞S期进程的影响

目的　探讨钙调素拮抗剂三氟拉嗪（ＴＦＰ）对ＨｅＬａ细胞Ｓ期进程的影响及其分子机理。　方法　通过ＴｄＲ双阻断法获得同步化的Ｓ期ＨｅＬａ细胞,以３Ｈ－ＴｄＲ掺入法和Ｗｅｓｔｅｒｎ 技术分别观察了ＴＦＰ对ＨｅＬａ 细胞Ｓ期进程和胸苷激酶（ｔｈｙｍ ｉｄｉｎｅ ｋｉｎａｓｅ,ＴＫ）活性及细胞周期引擎分子ＣｙｃｌｉｎＡ、Ｃｄｋ２ 和细胞周期调节蛋白ｐ８０ｃｄｃ２５Ｂ、ＰＣＮＡ、ｐ２１ 蛋白表达水平的影响。　结果　ＴＦＰ（２０μｍ ｏｌ／Ｌ）能使３ Ｈ－ＴｄＲ的掺入峰值后移,并抑制了Ｃｙ－ｃｌｉｎＡ、ＰＣＮＡ、ｐ８０ｃｄｃ２５Ｂ的表达和提高了ｐ２１ 蛋白的水平,但对Ｃｄｋ２的表达几乎无影响。　结论　ＣａＭ 除了能通过影响ＰＣＮＡ的水平直接作用于ＤＮＡ 合成,同时又可通过作用于ＣｙｃｌｉｎＡ、ｐ８０ｃｄｃ２５Ｂ、ｐ２１ 等周期引擎分子和调控因子水平正调ＨｅＬａ 细胞Ｓ期进程。     

EBV-LMP1通过NFκB介导的信号传导 途径活化CyclinD1机制初探

目的 :探讨ＥＢＶ -ＬＭＰ1促进细胞增殖 ,参与ＥＢＶ相关疾病致瘤的分子机制和ＥＢＶ -ＬＭＰ1通过ＮＦκＢ介导的信号传导途径活化细胞周期重要正性调节因子ＣｙｃｌｉｎＤ1表达的机制。方法 :利用已建株的 ,ＬＭＰ1表达受四环素衍生物强力霉素严密调控的ｐＴｅｔ-ｏｎ -ＬＭＰ1 -ＨＮＥ2稳定鼻咽癌细胞系 ,用强力霉素诱导ＬＭＰ1的表达 ,Ｗｅｓｔｅｒｎｂｌｏｔｔｉｎｇ从蛋白质水平分析ＬＭＰ1诱导ＣｙｃｌｉｎＤ1表达的表达动力学 ,包括时间效应及剂量效应 ,进一步在ＬＭＰ1稳定表达的鼻咽癌细胞系ＣＮＥ -ＬＭＰ1中 ,用反义硫代磷酸化…     

原癌基因CyclinD1在肺癌中表达的初步研究

目的：探讨ＣｙｃｌｉｎＤ１基因表达与肺癌发生发展关系。方法：应用免疫组化技术（ＳＰ法）检测ＣｙｃｌｉｎＤ１基因在２５例肺癌及４例癌旁正常肺组织中的表达。结果：ＣｙｃｌｉｎＤ１在肺癌中有较高表达，过表达阳性率２８％（７／２５例）；在４例癌旁正常肺组织中无表达；７例过表达者均为非小细胞肺癌；过表达与肿瘤体积呈正相关。结论：ＣｙｃｌｉｎＤ１基因过表达是肺癌尤其是非小细胞肺癌发生发展过程中的重要事件。     

端粒酶反义腺病毒载体对乳腺癌细胞MCF-7端粒酶的抑制作用

端粒酶ＲＮＡ的反义地人乳腺癌细胞系ＭＣＦ－７细胞端粒酶活性的影响。方法用重组腺病毒转移并表达端粒酶ＲＮＡ的反义ｃＤＮＡ,采用基因重组腺脂质体共转当闰酶反义重组病毒,用Ｓｏｕｔｈｅｒｎ杂交鉴定病毒的整合功能,用ＴＲＡＰ－ 染法检测端粒酶活性。结果ＭＣＦ－７细胞是恶性乳腺癌的典型细胞系。对对照组ＭＣＦ－７、ＭＣＦ－７、ｖＡｄ－ＡＡＶ细胞相比,反义病毒感染后的细胞是恶性乳腺癌的典型细胞系。与对照组ＭＣＦ     

自杀基因TK联合细胞因子FL真核表达载体的构建及其相 …

目的 探讨自杀基因ＴＫ（ｔｈｙｍｉｄｉｎｅ ｋｉｎａｓｅ,胸苷激酶）与细胞因子ＦＬ（ＬＩｔ－３ｌｉｇａｎｄ,ＦＩｔ－３配体）在同一细胞克隆中表达的特性,为肿瘤的基因冶疗提供实验基础。方法 构建以ＩＲＥＳ（内部核糖体进入位点）相连的ＴＫ与ＦＬ的真核表达质粒,脂质体法转入人乳腺癌细胞株ＭＣＦ－７中。ＭＴＴ法检ＧＣＶ（Ｇａｎｃｉｃｌｏｖｉｒ,更昔洛韦）对ＭＣＦ－７／ＴＫ－ＦＬ细胞的杀伤活性,电镜、光镜     

表达反义细胞周期蛋白cyclinD1载体对胰腺癌细胞生长和凋亡的 …

观察反义细胞周期蛋白ｃｙｃｌｉｎＤ１对胰腺癌细胞的生长影响。方法采用Ｓｏｕｔｈｅｒｎｂｌｏｔ和Ｎｏｒｔｈｅｒｍｂｌｏｔ方法检测了５株人胰腺癌细胞中ｃｙｃｌｉｎＤ１的扩增及表达情况。     

c—myc反义寡核苷酸对PDGF所致肺血管平滑肌细胞增殖的影响

ｃ－ｍｙｃ原癌基因是细胞增殖调控中的一种关键基因。文中报道了硫代磷酸修饰的ｃ－ｍｙｃ反义寡核苷酸（ＯＤＮＳ）对血小板源性生长因子（ＰＤＧＦ）刺激的肺动脉平滑肌细胞（ＳＭＣ）增殖及ｃ－ｍｙｃ基因表达的影响。Ｎｏｒｔｈｅｍ杂交结果表明：反义ＯＤＮＳ能显著下调ＰＤＧＦ刺激的ｃ－ｍｙｃ基因表达：３Ｈ－ＴｄＲ试验及细胞生长分析表明：反义ＯＤＮｓ能显著抑制ＰＤＧＦ刺激的ＳＭＣ增殖。同义００Ｎｓ无上述作用。     

人乳头状瘤病毒16型E6E7肿瘤性转化人永生化支气管上皮细胞

目的 探讨人乳头状瘤病毒（ＨＰＶ）１６型Ｅ６Ｅ７片段对人永生化支气管上皮细胞系ＴＲ细胞的作用。方法 将Ｅ６Ｅ７片段构建入逆转录病毒载体,导入ＴＲ细胞,观察生长特性和致瘤性的改变;并用免疫沉淀（ＩＰ）－Ｗｅｓｔｅｒｎ ｂｌｏｔ检测ｐ２７蛋白功能及ＦＡＫ、桩蛋白数量及磷酸化状况,结果 嘌呤霉素抗药性克隆ＴＲ／Ｅ６Ｅ７有Ｅ６Ｅ７的存在和稳定表达;ＴＲ／Ｅ６Ｅ７细胞系细胞生长加快,软琼脂集落形成能力增强,     

布托啡诺调控PBX3基因抑制乳腺癌细胞系MCF7增殖、迁移和侵袭

目的探讨布托啡诺(butorphanol)对乳腺癌细胞增殖、迁移和侵袭的影响以及相关的分子机制。方法用MTT法检测不同浓度布托啡诺对人乳腺癌细胞系MCF7的抑制作用;用Transwell迁移及侵袭实验检测不同浓度布托啡诺对人乳腺癌MCF7细胞迁移及侵袭的影响;RT-qCR与Western blot法分别检测乳腺癌细胞系、正常乳腺上皮细胞以及布托啡诺对MCF7细胞中PBX3 mRNA及蛋白表达的影响;观察转染si-PBX3或si-con后,MCF7细胞增殖、迁移及侵袭能力的变化;PBX3过表达验证布托啡诺对乳腺癌增殖、迁移及侵袭的作用机制。Western blot检测cyclin D1和MMP-2蛋白表达。结果PBX3在乳腺癌细胞系中的表达上调,沉默PBX3表达可明显抑制MCF7细胞增殖、迁移及侵袭,同时抑制cyclin D1和MMP-2的表达;不同浓度的布托啡诺干预能显著抑制MCF7细胞增殖、迁移及侵袭且具有浓度依赖性,还可抑制PBX3、cyclin D1和MMP-2的表达;过表达PBX3可逆转布托啡诺对乳腺癌细胞增殖、迁移及侵袭的抑制作用。结论布托啡诺可通过抑制PBX3降低乳腺癌细胞增殖、迁移及侵袭能力。     

Effects of apicidin, a histone deacetylase inhibitor, on the regulation of apoptosis in H-ras-transformed breast epithelial cells

The cellular susceptibility of cancer cells to histone deacetylase (HDAC) inhibitors is increased by the etopic expression of oncogenic Ras. However, the ability of HDAC inhibitors to regulate the apoptotic pathway in human breast cancer cells is still not completely understood. In this study, the anti-proliferative effects of apicidin were compared in H-ras-transformed human breast epithelial (MCF10A-ras) and non-transformed epithelial (MCF10A) cells. MCF10A-ras cells showed a significantly higher growth rate than MCF10A cells. Apicidin significantly increased the levels of acetylated histone H3 and H4 in both cell lines. Western blot analysis and flow cytometry were used to determine if the anti-proliferative effects of apicidin in MCF10A and MCF10A-ras cells could be mediated by modulating the cell cycle. Apicidin attenuated the expression of cyclin E and CDK2 in MCF10A cells, decreased cyclin D1 and cyclin E levels in MCF10A-ras cells, and increased the levels of CDK inhibitors, p21WAF1/Cip1 and p27Kip1, in both cell lines. Notably, the levels of hyperphosphorylation of the Rb protein levels were lower in the MCF10A-ras cells after apicidin treatment. Studies on the regulation of apoptosis showed that apicidin induces the up-regulation of p53 and the downstream activation of ERK in MCF10A-ras cells. The up-regulation of p53 promoted Bax expression leading to activation of caspases-9 and -6, and eventually to apoptosis in MCF10A-ras cells. In addition, apicidin significantly increased the levels of ERK1/2 phosphorylation in MCF10A-ras cells. Therefore, the apicidin-mediated ERK pathway appears to play an important role in modulating the pro-apoptotic pathway in MCF10A-ras cells.     

沉默GRP94 基因对乳腺癌MCF7 细胞增殖和凋亡的影响

目的： 研究沉默葡萄糖调节蛋白GRP94 (Glucose regulated protein,GRP94)对乳腺癌MCF7细胞增殖、凋亡的影响及潜在机制。方法：设计并化学合成靶向沉默GRP94基因的小干扰RNA,通过脂质体转染入MCF7细胞中,采用qRT-PCR和Western blot分别检测GRP94、cyclinD1、Bax和Bcl-2 mRNA和蛋白的表达水平;通过流式细胞术检测细胞凋亡比例变化,Hoechst 33258染色检测凋亡细胞核变化、CCK8实验检测细胞增殖能力的变化。结果： GRP94 siRNA组GRP94基因的表达水平被有效抑制;与对照组相比,GRP94-siRNA转染组的细胞凋亡比例明显增加;凋亡细胞核形态发生变化;增殖能力明显下降;mRNA及蛋白水平cyclinD1、Bcl-2表达明显下调,Bax表达增加。结论：沉默GRP94基因可明显抑制乳腺癌MCF7细胞增殖能力,促进细胞凋亡的发生,且其可能通过下调cyclinD1、Bcl-2和上调Bax表达参与其中。     

ATF4对皮肤癌细胞增殖的影响及相关机制

目的：探讨沉默/过表达ATF4对人皮肤癌细胞增殖的影响及其相关作用机制。方法：Western blot技术检测不同类型皮肤癌细胞中ATF4的蛋白表达水平。构建ATF4沉默/过表达的A431皮肤癌细胞株,采用CCK-8法、克隆形成实验和流式细胞术检测A431细胞增殖能力的变化及细胞周期分布;Western blot技术检测细胞周期调控因子cyclin D1、cyclin E、P21和p-Rb/Rb的蛋白表达水平。结果：ATF4在3种不同类型的皮肤癌细胞中均呈高表达。CCK-8法和克隆形成实验结果显示沉默ATF4的A431细胞存活率和增殖能力均显著降低(P<0.05),而过表达ATF4可促进A431细胞的增殖;流式细胞仪检测结果显示沉默ATF4可明显抑制A431细胞从G0/G1期向S期转换,过表达ATF4则促进其G1/S转换。同时Western blot实验结果显示沉默ATF4后,cyclin D1、cyclin E和p-Rb的蛋白水平均显著降低,而P21的蛋白表达显著增加(P<0.05),过表达ATF4后则cyclin D1、cyclin E和p-Rb的蛋白水平显著增加,而P21的蛋白表达显著降低(P<0.05)。结论：ATF4能够促进人皮肤鳞状细胞癌细胞株A431的增殖,其潜在作用机制可能与促进细胞周期G1/S转换及影响相关周期调控因子的表达有关,提示AT F 4可作为治疗皮肤癌的一个潜在作用靶点。     

Effects of trichostatin A, a histone deacetylase inhibitor, on the regulation of apoptosis in H-ras-transformed breast epithelial cells

This study examined the mechanism for the anti-cancer effects of histone deacetylase (HDAC) inhibitor trichostatin A (TsA) in H-ras-transformed human breast epithelial (MCF10A-ras) cells. The effects of TsA on anti-cancer effects of MCF10A-ras cells were determined by measuring the level of cell cycle regulator expression and apoptotic cell death using Western blotting and flow cytometry analysis, respectively. TsA induced morphological changes, apoptotic cell death and modulation of the cell cycle regulatory proteins in the MCF10A-ras cells. TsA increased the levels of acetylated histone H3 and H4 in MCF10A-ras cells. In addition, TsA markedly down-regulated the expression of cyclin D1 and CDK4, up-regulated the expression of p21WAF1 and p53 and induced cell cycle arrest at the G1 phase in MCF10A-ras cells. The levels of hyperphosphorylation of the Rb protein were lower in MCF10A-ras cells after the TsA treatment. Furthermore, the up-regulation of p53 promoted Bax expression, which led to the activation of pro-caspase-3 and eventually to apoptosis in MCF10A-ras cells. TsA significantly increased the levels of ERK1/2 phosphorylation in MCF10A-ras cells. Overall, the TsA-activated ERK pathway plays an important role in cell cycle arrest and apoptosis through the ERK-dependent induction of p21 in Ras-related human cancer cells.     

鞘糖脂微结构域1相关磷酸化蛋白基因的筛选及其对转移性前列腺癌细胞生物学行为的影响

目的 筛选肿瘤转移相关新基因,探讨鞘精脂微结构域1相关磷酸化蛋白基因(PAG1)转染对人前列腺癌细胞系PC-3M的高转移亚系PC-3M-1E8体外生物学行为的影响.方法 利用PC-3M高转移亚系PC-3M-1E8、低转移亚系PC-3M-284,人肺巨细胞痛细胞系(PG)高转移亚系PG-BE1和低转移亚系PG-LH7 cDNA制作4张基因芯片,筛选出PC-3M和PG高、低转移亚系共同差异表达基因.对在两个转移亚系共同表达下调的PAG1基因做进一步研究,采用即时定量PCR及Western blot验证PAG1在PC-3M细胞系中的表达.构建pcDNA3.0-PAG1真核表达载体,稳定转染PC-3M-1E8细胞.MTT比色实验及软琼脂集落形成实验检测肿瘤细胞体外增殖能力;流式细胞术检测肿瘤细胞周期及凋亡;Matrigel穿膜实验检测肿瘤细胞体外侵袭能力.结果 基因芯片初步筛选出PC-3M高、低转移亚系差异表达基因共327个,上调基因123个,下调基因204个.PG高、低转移亚系差异表达基因共281个,上调基因167个,下调基因114个.PC-3M与PG高转移亚系共同表达下调基因9个、上调基因8个.即时定量PCR及Western blot证实PAG1在PC-3M高转移亚系中表达低于低转移亚系.MTT比色及软琼脂集落形成实验显示转染pcDNA3.0-PAG1组细胞增殖速度明显低于转染空载体组和未转染组(均P<0.05).细胞周期检测转染pcDNA3.0-PAG1组比转染空载体组和未转染组处于G_0～G_1期的细胞百分数明显增加(P<0.05).转染pcDNA3.0-PAG1组与转染空载体组和未转染组相比凋亡细胞百分率无显著差异(P>0.05).体外穿膜侵袭实验结果表明转染pcDNA3.0-PAG1组比转染空载体组和未转染组穿膜细胞数目明显减少,分别为(35.1±4.9)、(127.6±6.6)和(135.0±5.0)个(P<0.05).结论 利用同一母系来源的高、低转移亚系制作基因芯片可以摒除转移无关基因的干扰,筛选出差异表达的肿瘤转移相关基因.PAG1基因稳定转染能抑制人前列腺癌高转移亚系PC-3M-1E8细胞的体外增殖能力和侵袭能力,PAG1基因可能是一个潜在的肿瘤增殖、侵袭和转移的抑制基因.     

Concerted overexpression of the genes encoding p21 and cyclin D1 is associated with growth inhibition and differentiation in various carcinomas.

AIMS: To investigate the expression of the genes encoding cyclin D1 and p21 in proliferative and non-proliferative cells, as demonstrated by the Ki67 antibody, and to correlate these findings with differentiation. METHODS: Immunohistochemistry and immunofluorescence double staining were performed on three breast cancers, two squamous cell cancers of the head and neck, and one ovarium cystadenocarcinoma. In addition, the in vitro effect of cyclin D1 on p21 gene expression in MCF7 breast cancer cells was evaluated. RESULTS: Immunofluorescence double staining showed a differentiation related gradient in the detection of the Ki67 antigen, cyclin D1, and p21 in squamous cell cancers of the head and neck: Ki67 was detected in the basal layers of the tumour and the cyclin D1 and p21 genes were coexpressed in the higher, more differentiated layers of the tumour. The breast and ovarian cancers often had cells that coexpressed the p21 and cyclin D1 genes, whereas coexpression of cyclin D1 and Ki67 did not occur. Western blot analysis of the MCF7 breast cancer cells showed an upregulation of p21 production when cyclin D1 gene expression was induced. CONCLUSION: Overexpression of the cyclin D1 gene seems to lead to growth arrest in a variety of human cancers, possibly through the induction of p21 by cyclin D1. In squamous cell cancer, concerted overexpression of the genes encoding cyclin D1 and p21 might also induce differentiation.     

Concerted overexpression of the genes encoding p21 and cyclin D1 is associated with growth inhibition and differentiation in various carcinomas.

AIMS: To investigate the expression of the genes encoding cyclin D1 and p21 in proliferative and non-proliferative cells, as demonstrated by the Ki67 antibody, and to correlate these findings with differentiation. METHODS: Immunohistochemistry and immunofluorescence double staining were performed on three breast cancers, two squamous cell cancers of the head and neck, and one ovarium cystadenocarcinoma. In addition, the in vitro effect of cyclin D1 on p21 gene expression in MCF7 breast cancer cells was evaluated. RESULTS: Immunofluorescence double staining showed a differentiation related gradient in the detection of the Ki67 antigen, cyclin D1, and p21 in squamous cell cancers of the head and neck: Ki67 was detected in the basal layers of the tumour and the cyclin D1 and p21 genes were coexpressed in the higher, more differentiated layers of the tumour. The breast and ovarian cancers often had cells that coexpressed the p21 and cyclin D1 genes, whereas coexpression of cyclin D1 and Ki67 did not occur. Western blot analysis of the MCF7 breast cancer cells showed an upregulation of p21 production when cyclin D1 gene expression was induced. CONCLUSION: Overexpression of the cyclin D1 gene seems to lead to growth arrest in a variety of human cancers, possibly through the induction of p21 by cyclin D1. In squamous cell cancer, concerted overexpression of the genes encoding cyclin D1 and p21 might also induce differentiation.     

地西他滨抑制K562白血病细胞增殖和诱导分化的作用

目的:观察地西他滨(DAC)抑制白血病K562细胞生长和诱导分化的作用。方法:不同浓度的DAC处理K562细胞。MTT法和半固体集落生成实验检测K562细胞增殖能力;瑞氏染色观察细胞形态;流式细胞术检测分化相关抗原CD11b和CD42b阳性表达率;Western blot检测细胞周期蛋白依赖性激酶2(CDK2)、细胞周期蛋白E1(cyclin E1)、细胞周期负调控因子P27、红系分化核转录因子GATA-1及粒系分化核转录因子PU.1蛋白的表达水平。结果:DAC能够减少K562细胞集落形成的数量,降低细胞活力,减少核质比,抑制K562细胞进入S期,并阻滞在G_2/M期,提高分化相关抗原CD11b和CD42b阳性表达率,上调P27、GATA-1和PU.1蛋白表达,同时下调CDK2和cyclin E1蛋白表达。结论:DAC可能通过调控细胞周期抑制K562细胞增殖,同时诱导多向分化。