PI3K／Akt信号通路在骨髓间充质干细胞增殖及成骨分化调控中的作用

目的：研究PI3K/Akt信号通路抑制剂LY294002对骨髓间充质干细胞（mesenchymal stem cells,MSCs）增殖及分化的影响。方法采用贴壁法体外分离人骨髓间充质干细胞（hMSCs）,加入PI3K抑制剂LY294002（1、10μmol/L）,应用MTT法测定细胞增殖,常规成骨诱导分化培养3或7d,采用碱性磷酸酶（ALP）染色观察成骨分化水平,化学比色法测定ALP活性,茜素红染色后观察矿化钙结节数量并定量分析,Westernblot检测磷酸化Akt蛋白表达,应用Realtime-PCR检测各组细胞BMP2、Runx2、OPN及Osterix等成骨分化标记物的基因表达水平。结果从24至72h,LY294002对hMSCs增殖均产生显著抑制,随时间推延,可见抑制增殖效果增强（P＜0.05）。ALP染色和定量测定提示10μmol/L的ALP活性最强,在不同时间显著高于对照组和1μmol/L组（P＜0.05）。成骨诱导培养3和7d,1、10μmol/L组矿化量都显著高于对照组（P＜0.05）。10μmol/L组矿化量在成骨诱导7d也显著高于1μmol/L组（P＜0.05）。Westernblot检测结果证实成骨诱导可激活Akt磷酸化蛋白表达,但LY294002可抑制该蛋白磷酸化。成骨诱导分化7d,1、10μmol/L均明显促进BMP2、Runx2、OPN、Osterix4种基因mRNA表达（均P＜0.05）。结论PI3K/Akt信号通路参与hMSCs增殖和分化过程。成骨分化伴随下游Akt蛋白表达。PI3K抑制剂可抑制hMSCs增殖,但同时促进其向成骨分化和矿化。     

PI3K在CD_3mAb活化T细胞信号转导中的作用

目的探讨磷脂酰肌酶-3激酶（PI3K）在CD3mAb活化T细胞信号转导途径中的作用。方法分离获取健康人外周血单个核细胞（PBMC）,用不同浓度的PI3K特异性抑制剂LY294002处理后再用CD3mAb活化T细胞。0、6、12、24、48、72h后检测总T细胞CD69分子的表达及IL-2表达情况,培养10d后计数总T细胞的增殖情况。结果LY294002呈浓度依赖性地抑制总T细胞CD69的表达、IL-2的产生和T细胞增殖。结论PI3K参与CD3mAb诱导T淋巴细胞活化的信号转导途径,对T细胞的充分活化必不可少。     

达沙替尼对人脐静脉内皮细胞的损伤与PI3K/Akt途径抑制有关

目的探索达沙替尼对人脐静脉内皮细胞(HUVEC)增殖、迁移和凋亡等生物学特性的影响,为完善其临床应用提供资料。方法实验分组:达沙替尼组(达沙替尼处理浓度为50 nmol/L)、LY294002组(PI3K抑制剂,处理浓度为20μmol/L)、联合处理组(达沙替尼处理浓度为50 nmol/L、LY294002处理浓度为20μmol/L)及溶媒对照组(DMSO浓度为0.1%)。CCK8法检测细胞活性,划痕法检测细胞迁移,流式细胞术检测细胞凋亡和细胞周期,Western blot检测Akt和p-Akt蛋白水平。结果达沙替尼(1~400 nmol/L)不仅抑制HUVEC增殖,而且诱导其凋亡、抑制其迁移、阻滞细胞周期G1-S期转化。随浓度的升高与处理时间的延长(50 nmol/L,24 h~96 h)达沙替尼对细胞增殖抑制作用和诱导凋亡作用明显,同时HUVEC的迁移能力随达沙替尼浓度(50~100 nmol/L)的升高而降低。达沙替尼和PI3K抑制剂LY294002两者单独处理时均具有细胞增殖抑制作用,两者均明显抑制Akt蛋白磷酸化水平;两者联合处理时虽然细胞增殖抑制作用增强,但对Akt蛋白磷酸化水平的影响与单独处理相比差异不明显。结论达沙替尼可通过PI3K/Akt通路促进HUVEC损伤,抑制HUVEC增殖和迁移,改变细胞形态,阻滞HUVEC G1-S期转化,诱导细胞凋亡。     

粒细胞集落刺激因子通过PI3K-Akt通路抑制缺血再灌注损伤

目的:研究经冠状动脉(冠脉)内注入粒细胞集落刺激因子(G-CSF)对大鼠心肌缺血再灌注损伤的预防作用,及其与PI3K-Akt信号转导途径的关系。方法:制备大鼠心肌缺血再灌注模型。再灌注同时经冠脉内给予G-CSF或G-CSF+PI3K激酶抑制剂(LY294002),灌注120min后应用TUNEL法检测细胞凋亡,免疫组织化学法观察凋亡相关蛋白Bax及Bcl-2及caspase-3表达情况,免疫印迹检测总-Akt(t-Akt)及磷酸化Akt(p-Akt)表达。结果:缺血再灌注同时给予冠脉内G-CSF治疗能够显著减轻缺血区心肌细胞凋亡,降低Bax、caspase-3的表达,增高心肌细胞内Bcl-2表达,同时p-Akt的蛋白水平显著增高(P<0.01)。LY294002阻断Akt活化后,抑制了G-CSF诱导的抗心肌细胞凋亡作用。结论:缺血再灌注同时冠脉内给予G-CSF可保护梗死区残存的心肌细胞,减少缺血再灌注所诱导的心肌细胞凋亡,其保护机制与PI3K-Akt信号通路有关。     

硼替佐米抑制PI3K/Akt通路增强胃癌细胞对TRAIL诱导凋亡的敏感性

目的:研究硼替佐米对TRAIL诱导胃癌细胞凋亡的影响, 探讨PI3K/Akt通路在TRAIL诱导凋亡中的作用.方法:不同浓度的TRAIL和/或硼替佐米作用于人胃癌细胞系MGC803细胞, MTT法检测细胞存活率, 流式细胞术PI染色检测细胞凋亡.Western blot法检测caspase裂解及p-Akt表达水平的变化.结果:50 nmol/L硼替佐米预处理细胞2 h, 之后予100 μg/L TRAIL继续作用24 h, 细胞存活率明显低于TRAIL单独处理组(35.1%±2.7% vs71.0%±4.3%, P <0.01); 细胞凋亡率明显高于TRAIL单药组(31.3%±2.0% vs 8.2%±0.8%,P <0.01). 20 nmol/L硼替佐米预处理未能增强细胞对TRAIL的敏感性. 进一步研究发现,TRAIL可活化PI3K/Akt通路, 硼替佐米预处理可阻止PI3K/Akt通路的活化, 进而增强细胞对TRAIL诱导凋亡的敏感性.结论:硼替佐米通过抑制TRAIL诱导的PI3K/Ak t通路活化, 增强胃癌MGC803细胞对TRAIL诱导凋亡的敏感性.     

葛根素通过PI3K/Akt途径对大鼠缺血再灌注心肌细胞凋亡的抑制

目的 观察葛根素预处理对缺血再灌注(I/R)大鼠心肌细胞凋亡的影响及其与PI3K/Akt信号通路的关系.方法 30只SD大鼠随机分为假手术组(SH组)、缺血再灌注组(I/R组)、葛根素预处理组(PU组)、葛根素预处理+LY294002组(PU+ LY组)及缺血再灌注+LY294002组(I/R+ LY组).除假手术组外,其他各组大鼠均行结扎冠状动脉前降支30 min,再灌注120 min,监测血流动力学,Western印迹法检测心肌组织p-Akt信号蛋白的表达;TUNEL法检测心肌细胞凋亡.结果 与I/R组比较,PU组能够明显改善心功能,抑制心肌细胞凋亡,并增加Akt的磷酸化水平(P<0.05,P<0.01).结论 葛根素预处理能够抑制缺血再灌注所致的心肌细胞凋亡,其作用机制与PI3K/Akt信号通路活化有关.     

Knockdown of DEAD-box 51 inhibits tumor growth of esophageal squamous cell carcinoma via the PI3K/AKT pathway

BACKGROUND Esophageal squamous cell carcinoma(ESCC)is one of the most prevalent malignancies that seriously threaten people’s health worldwide.DEAD-box helicase 51(DDX51)is a member of the DEAD-box(DDX)RNA helicase family,and drives or inhibits tumor progression in multiple cancer types.AIM To determine whether DDX51 affects the biological behavior of ESCC.METHODS The expression of DDX51 in ESCC tumor tissues and adjacent normal tissues was detected by Immunohistochemistry(IHC)analyses and quantitative PCR(qPCR).We knocked down DDX51 in ESCC cell lines by using a small interfering RNA(siRNA)transfection.The proliferation,apoptosis,and mobility of DDX51 siRNAtransfected cells were detected.The effect of DDX51 on the phosphoinositide 3-kinase(PI3K)/AKT pathway was investigated by western blot analysis.A mouse xenograft model was established to investigate the effects of DDX51 knockdown on ESCC tumor growth.RESULTS DDX51 exhibited high expression in ESCC tissues compared with normal tissues and represented a poor prognosis in patients with ESCC.Knockdown of DDX51 induced inhibition of ESCC cell proliferation and promoted apoptosis.Moreover,DDX51 siRNA-expressing cells also exhibited lower migration and invasion rates.Investigations into the underlying mechanisms suggested that DDX51 knock down induced inactivation of the PI3K/AKT pathway,including decreased phosphorylation levels of phosphate and tensin homolog,PI3K,AKT,and mammalian target of rapamycin.Rescue experiments demonstrated that the AKT activator insulin-like growth factor 1 could reverse the inhibitory effects of DDX51 on ESCC malignant development.Finally,we injected DDX51 siRNA-transfected TE-1 cells into an animal model,which resulted in slower tumor growth.CONCLUSION Our study suggests for the first time that DDX51 promotes cancer cell proliferation by regulating the PI3K/AKT pathway;thus,DDX51 might be a therapeutic target for ESCC.     

PI3K/Akt信号通路对肝癌细胞系HepG2中SP细胞的影响

[目的]探讨PI3K/Akt信号通路对肝癌细胞系HepG2中肿瘤干细胞比例及干细胞特性的影响.[方法]使用PI3K/Akt通路抑制剂处理HepG2细胞后,使用流式技术分析HepG2细胞系中的侧群（SP）细胞的变化.软琼脂克隆形成实验检测PI3K/Akt抑制剂对HepG2细胞中SP细胞和非SP细胞成克隆能力的影响.[结果]HepG2细胞中存在SP细胞,经过LY294002处理后,SP细胞比例下降.LY294002可以显著降低SP细胞的软琼脂成克隆能力,对非SP细胞的软琼脂成克隆能力影响不明显.[结论]HepG2细胞中的SP细胞具有干细胞特性,PI3K/Akt信号通路对HepG2细胞中SP细胞的维持起重要作用,抑制PI3K/Akt信号通路后HepG2细胞中的SP细胞比例明显减低,并能显著抑制SP细胞的增殖速度、软琼脂成克隆能力,增加SP细胞对化疗药物的敏感性,为更加深入地了解肝癌干细胞的特性以及探索针对肿瘤干细胞的治疗提供理论依据.     

Induction of apoptosis in childhood acute leukemia by chemotherapeutic agents: Failure to detect evidence of apoptosis in vivo

Abstract: This study is designed to investigate whether apoptosis occurs in vivo in pediatric patients with acute leukemia during induction therapy. When patients with common acute lymphoblastic leukemia (cALL) and acute myeloblastic leukemia (AML) were treated with prednisolone (60 mg/m²/day, p.o. or i.v.) and etoposide (150 mg/m²/day, i.v.), respectively, the blast cell counts fell to below 30% and 5%, respectively, in 1 week. However, during this cytoreduction phase, neither morphologically apoptotic cells nor fragmentation of DNA derived from peripheral blast cells were detected at any preparations. On the other hand, cALL but not AML cells spontaneously undergo apoptosis following their culture in vitro. The addition of autologous serum instead of fetal calf serum substantially prevented apoptosis from occurring spontaneously in cALL cells. When cALL and AML cells freshly obtained from patients before therapy were treated in vitro with 10 μmol/1 prednisolone and 20 μg/ml etoposide, respectively, these cells underwent apoptosis within 6 hours, as determined by a morphological and DNA fragmentation assay. These in vivo and in vitro findings suggest that, although anticancer drugs may induce apoptosis in vivo, these apoptotic cells cannot be detected due to their rapid removal from the circulation.     

左西孟旦对缺氧复氧诱导的H9c2细胞凋亡、PTEN和PI3K/Akt信号通路的影响

[目的]研究左西孟旦对缺氧复氧(H/R)条件下H9c2细胞凋亡的影响及相关机制。[方法]体外培养H9c2细胞,将细胞分为空白对照组、H/R组、左西孟旦低剂量组、左西孟旦中剂量组、左西孟旦高剂量组。采用四甲基偶氮噻唑蓝法检测H9c2细胞增殖;流式细胞仪检测H9c2细胞凋亡;超氧化物歧化酶(SOD)试剂盒、丙二醛(MDA)试剂盒分别检测SOD活性及MDA含量;荧光探针法检测活性氧(ROS)水平;Western blot检测增殖细胞核抗原(PCNA)、B淋巴细胞瘤2蛋白(Bcl-2)、Bcl-2相关X蛋白(Bax)、磷酸酶及张力蛋白同源物(PTEN)及磷脂酰肌醇3激酶(PI3K)/丝氨酸苏氨酸蛋白激酶(Akt)信号通路蛋白表达。[结果]与空白对照组比较,H/R组H9c2细胞增殖抑制率、凋亡率、MDA含量、ROS水平、PTEN蛋白表达均显著升高(P<0.05),PCNA、Bcl-2、p-PI3K/PI3K、p-Akt/Akt均显著降低,Bax显著升高(P<0.05)。与H/R组比较,左西孟旦低剂量组、左西孟旦中剂量组、左西孟旦高剂量组H9c2细胞增殖抑制率、凋亡率、MDA含量、RO...     

Autocrine IGF-1/IGF-1R signaling is responsible for constitutive PI3K/Akt activation in acute myeloid leukemia: therapeutic value of neutralizing anti-IGF-1R antibody

Background

Alterations in the PI3K/Akt pathway are found in a wide range of cancers and the development of PI3K inhibitors represents a promising approach to cancer therapy. Constitutive PI3K activation, reflecting an intrinsic oncogenic deregulation of primary blast cells, is detected in 50% of patients with acute myeloid leukemia. However, the mechanisms leading to this activation are currently unknown. As we previously reported IGF-1 autocriny in acute myeloid leukemia cells, we investigated whether IGF-1 signaling was involved in the constitutive activation of PI3K.

Design and Methods

We analyzed the IGF-1/IGF-1R signaling pathway and PI3K activity in 40 acute myeloid leukemia bone marrow samples. Specific inhibition of IGF-1/IGF-1R signaling was investigated using neutralizing anti-IGF-1R, anti-IGF-1 antibodies or IGF-1 short interfering RNA. The anti-leukemic activity of the neutralizing anti-IGF-1R was tested by analyzing its effects on leukemic progenitor clonogenicity, blast cell proliferation and survival.

Results

In all samples tested, we found that functional IGF-1R was constantly expressed in leukemic cells. In the acute myeloid leukemia samples with PI3K activation, we found that the IGF-1R was constitutively phosphorylated, although no IGF-1R activating mutation was detected. Specific inhibition of IGF-1R signaling with neutralizing anti-IGF-1R strongly inhibited the constitutive phosphorylation of both IGF-1R and Akt in 70% of the PI3K activated samples. Moreover, both incubation with anti-IGF-1 antibody and IGF-1 short interfering RNA inhibited Akt phosphorylation in leukemic cells. Finally, neutralizing anti-IGF-1R treatment decreased the clonogenicity of leukemic progenitors and the proliferation of PI3K activated acute myeloid leukemia cells.

Conclusions

Our current data indicate a critical role for IGF-1 autocriny in constitutive PI3K/Akt activation in primary acute myeloid leukemia cells and provide a strong rationale for targeting IGF-1R as a potential new therapy for this disease.     

AKT/PI3K信号通路介导的干细胞动员在抗心梗后心律失常中的作用

目的 探讨心肌梗死（MI）后丝氨酸/苏氨酸/磷脂酰肌醇-3激酶（AKT/PI3K）信号通路介导的心脏干细胞（CSCs）动员对抗心梗后心律失常的影响.方法 将大鼠随机分为5组,每组20只：对照组（CON组）、结扎组（LI组）、结扎＋注射组（LI＋LY组）、缺血预处理＋结扎组（IP＋LI组）、缺血预处理＋结扎＋注射组（IP＋LI＋LY组）.采用结扎LAD的方法建立心梗模型,采用流式细胞分析、ELISA法等检测各组AKT/PI3K信号通路相关指标的表达情况及心律失常的发生情况.结果 LI＋LY组炎症反应显著高于其他各组,IP＋LI组显著低于IP＋LI＋LY组、LI＋LY组、LI组（P＜0.05）;IP＋LI组比LI组CD34＋、Oct4＋细胞的数量多（P＜0.05）;与CON组相比,IP＋LI组SDF-1表达显著增加,LI＋LY组及LI组表达明显减少（P＜0.05）;与LI组比较,IP＋LI组心律失常的发生率明显降低,QTc间期也明显缩短（P＜0.05）.结论 通过激活内源性Akt/PI3K信号通路,可有效促进内源性心脏干细胞动员及归巢,使心肌细胞再生,从而改善心脏功能,降低心肌缺血后室性心律失常的发生.     

PI3K/Akt 信号通路与肿瘤细胞凋亡相关研究进展

PI3K/Akt信号通路作为细胞内重要信号转导通路之一,通过影响下游多种效应分子的活化状态,在细胞内发挥抑制凋亡、促进增殖的关键作用,它与人类多种肿瘤的发生发展密切相关.因此,通过对PI3K/Akt信号通路的研究有望寻求肿瘤药物治疗的新靶点.本文综述了PI3K/Akt信号通路的组成与功能、调节以及其抗肿瘤细胞凋亡作用机理等方面的研究进展,并就其抗细胞凋亡作用在肿瘤治疗中的应用作了评述,期待为以PI3K/Akt信号通路中关键分子为靶点的肿瘤治疗研究提供参考.     

IGF-1对Rh1肉瘤细胞PI3K/Akt/mTOR信号通路的影响

目的 探讨胰岛素样生长因子(IGF)1对Rh1肉瘤细胞生长活性和PI3 K/Akt/mTOR信号通路的背景变化.方法 常规细胞培养,用无血清培养基消除内源性因子影响27h,再用IGF-1(终浓度为10 ng/ml)刺激72 h,流式细胞仪检测细胞生长活性;另外Western印迹方法观察IGF-1刺激细胞5、10、20、30和60min后Akt(s473)、S6的动态变化.结果 与对照组相比,IGF-1可促进Rh1细胞存活.IGF-1刺激不同时间后S6磷酸化则随着时间的延长逐渐增强;IGF-1亦导致Akt(s473)位点的磷酸化,随时间的延长,磷酸化Akt在5min时达高峰,此后逐渐减弱.结论 Akt、S6等是PI3K/Akt/mTOR信号通路中的重要信号分子,对Rhl细胞而言,在IGF-1刺激下S6有逐渐增强的变化,Akt (s473)位点磷酸化则有减弱的动态变化.     

杨梅素通过磷脂酰肌醇3-激酶/蛋白激酶B/哺乳动物雷帕霉素靶蛋白信号通路诱导MTB感染巨噬细胞发生自噬的研究

目的对杨梅素通过磷脂酰肌醇3-激酶/蛋白激酶B/哺乳动物雷帕霉素靶蛋白(PI3K/Akt/mTOR)信号通路诱导MTB感染的巨噬细胞发生自噬进行研究,从而探讨杨梅素抗结核作用的机理。方法用CCK8法检测杨梅素对细胞增殖的影响,确定安全的用药范围;以H37Ra菌株感染的小鼠巨噬细胞Raw 264.7为模型组,并设空白组和药物处理组。按感染复数(MOI,即细菌:细胞=10:1)加入模型组、药物处理组,共孵育4 h后,磷酸盐缓冲液(PBS)洗3次以弃掉未进入胞内的MTB。药物处理组分别用不同浓度(12.5、25、50、100μmol/L)的杨梅素作用24 h,Western blot法检测自噬相关蛋白即"微管相关蛋白1轻链3-Ⅱ(LC3-Ⅱ)和p62"表达水平的变化,并以此筛选出杨梅素促进自噬的最佳作用浓度;100μmol/L杨梅素作用于感染细胞72 h后,0.1%聚乙二醇辛基苯基醚(Triton X-100)冰上裂解细胞10 min,菌落形成单位(CFU)法检测巨噬细胞胞内荷菌量;杨梅素作用感染细胞不同时间(30、60、180 min)后Western blot测定PI3K/Akt/mTO...     

Embryonic liver fordin is involved in glucose glycolysis of hepatic stellate cell by regulating PI3K/Akt signaling

AIMTo investigate the role of embryonic liver fordin (ELF) in liver fibrosis by regulating hepatic stellate cells (HSCs) glucose glycolysis.METHODSThe expression of ELF and the glucose glycolysis-related proteins were evaluated in activated HSCs. siRNA was used to silence ELF expression in activated HSCs in vitro and the subsequent changes in PI3K/Akt signaling and glucose glycolysis-related proteins were observed.RESULTSThe expression of ELF increased remarkably in HSCs of the fibrosis mouse model and HSCs that were cultured for 3 wk in vitro. Glucose glycolysis-related proteins showed an obvious increase in the activated HSCs, such as phosphofructokinase, platelet and glucose transporter 1. ELF-siRNA, which perfectly silenced the expression of ELF in activated HSCs, led to the induction of glucose glycolysis-related proteins and extracellular matrix (ECM) components. Moreover, pAkt, which is an important downstream factor in PI3K/Akt signaling, showed a significant change in response to the ELF silencing. The expression of glucose glycolysis-related proteins and ECM components decreased remarkably when the PI3K/Akt signaling was blocked by Ly294002 in the activated HSCs.CONCLUSIONELF is involved in HSC glucose glycolysis by regulating PI3K/Akt signaling.     

TIMP-1抑制大鼠肾小球系膜细胞凋亡与磷脂酰肌醇3激酶/丝/苏氨酸激酶通路的研究

目的探讨磷脂酰肌醇3激酶(phosphoinositide-3-kinase,PI3K)/丝/苏氨酸激酶(serine thre-onine kinase,AKT)通路在基质金属蛋白酶组织抑制剂1(tissue inhibitor of metalloproteinase-1,TIMP-1)抑制高糖诱导大鼠肾小球系膜细胞(rat mesangial cells,RMC)凋亡中的作用和机制。方法(1)脂质体法将正、反义人TIMP-1(hTIMP-1)及空载体转染到大鼠肾小球系膜细胞。(2)Annexin V/PI双染法流式检测系膜细胞凋亡率。(3)Caspase9/Mch6Colorimetric Assay试剂盒检测Caspase9活性。(4)Western blot检测BAD、phospho-BAD、AKT、phospho-AKT蛋白水平。结果与对照组(1·06±0·08)%相比,正义转染组细胞凋亡率降低[(4·51±0·50)%,P<0·05],反义转染组凋亡率显著提高[(24·97±3·64)%,P<0·05],LY294002的加入可部分抵消TIMP-1的抗凋亡作用。TIMP-1的高表达可下调Caspase9活性(0·111±0·064,P<0·05),低表达可上调Caspase9活性(0·461±0·012,P<0·05)。正义TIMP-1能提高细胞phos-pho-BAD、phospho-AKT的蛋白水平,而反义TIMP-1的两种蛋白水平明显减少,且该作用可被LY294002阻断。结论(1)PI3K/AKT通路参与TIMP-1抑制高糖诱导的大鼠肾小球系膜细胞凋亡过程。(2)BAD在其中起重要作用。(3)AKT对Caspase9的抑制亦起主要作用。     

PI3K／Akt信号途径参与高糖诱导的肾小管上皮细胞转分化及对分化抑制因子2表达的影响

目的观察PI3K／Akt在高糖诱导的肾小管上皮细胞转分化中的作用及对分化抑制因子2（1d2）表达的影响。方法大鼠肾小管上皮细胞随机分成3组：对照（Con）组,高糖（H—Glu）组和PI3K抑制剂Wortmannin（Wort）组。Con组加正常培养液,限GIu组在培养液中加30mmol／L葡萄糖,Wort组用Wortmannin预处理1h后,加30mmol／L葡萄糖。24h后用免疫细胞化学、Western blot法和RT-PCR法检测α平滑肌肌动蛋白（α-SMA）、p-Akt和Id2的表达。结果Con组α-SMA、p-Akt阳性表达细胞很少,绝大部分细胞出现Id2阳性表达。与COn组比较,H-Glu组出现α-SMA和p-Akt表达升高,Id2表达降低（P〈0．05）。与H-Glu组比较,Wort组α-SMA和p-Akt表达下降,Id2表达升高（P〈0．05）。结论PI3K／Akt可能通过抑制Id2基因表达,参与高糖诱导的大鼠肾小管上皮细胞转分化。