FKBP38蛋白对子宫内膜癌前期病变的影响及其机制研究北大核心CSCD

目的构建子宫特异敲除FKBP38小鼠模型,探究FKBP38对于小鼠子宫内膜癌前期病变的影响及其作用机制。方法通过胚胎注射法使小鼠FKBP38基因上携带loxP位点,构建转基因小鼠模型。在此基础上,以在子宫特异表达的孕酮受体启动子Pgr-Cre小鼠介导FKBP38条件性敲除,以获得FKBP38子宫特异敲除小鼠模型Pgr-Cre;FKBP38^(fl/fl)。通过PCR及Western blot对子宫特异敲除FKBP38小鼠进行鉴定;通过苏木精-伊红染色法(hematoxylin-eosin staining,HE)检测小鼠子宫敲除FKBP38后组织病理性变化;通过Western blot技术检测小鼠子宫敲除FKBP38后对mTOR通路的影响。结果小鼠子宫特异敲除FKBP38后子宫中FKBP38蛋白表达水平明显降低,与同年龄同窝小鼠相比,差异有统计学意义(P<0.01)。在己烯雌酚刺激下,小鼠18月龄时,子宫特异敲除FKBP38小鼠中16.7%(1/6)发生复杂性非典型性增生(complex atypical hyperplasia,CAH),33.3%(2/6)发生简单性增生(simple hyperplasia,SH)。此外,子宫特异敲除FKBP38小鼠子宫中AKT、S6及4E-BP-1蛋白的磷酸化水平明显升高。结论子宫特异敲除FKBP38小鼠子宫中FKBP38蛋白明显降低,表明小鼠子宫特异敲除模型构建成功。此外,子宫特异敲除FKBP38后,小鼠发生SH以及CAH,表明FKBP38可能与子宫内膜癌癌前病变相关。这可能与FKBP38调控mTOR通路关键性蛋白Akt、S6及4E-BP-1蛋白的磷酸化相关。     

Berberine targeting TRIM25 induced cervical cancer HeLa cell apoptosis北大核心CSCD

Aim To study the mechanism and target of apoptosis induced by berberine ( BBR) in cervical cancer HeLa cells. Methods Drug affinity responsive target stability (DARTS) and mass spectrometry (MS) were used to identify the potential binding proteins of berberine. The binding affinity between berberine and candidate target protein was detected by microscale thermophoresis technique (MST) , and cellular thermal shift assay (CETSA) was used to detect the binding of berberine to candidate target proteins in living cells. CRISPR/Cas9 gene editing technique was used to establish candidate target protein TRIM25-deficient tumor cell lines. CCK-8 assay and Annexin V/propidium iodide combined with flow cytometry were used to detect the inhibitory and apoptotic effects of berberine on wild-type and TRIM25-KO cells. Western blot was used to detect the effect of berberine on TRIM25 and its substrate protein levels.Results DARTS found that after berberine treatment, the sensitivity of TRIM25 to pronase proteolysis showed the most significant change. MST and CETSA assays showed that berberine directly bound to TRIM25 at molecular and cellular levels, and its dissociation constant was 4.02 μmol • L -1in vitro. The cervical cancer HeLa cell line with TRIM25 deletion was successfully constructed. TRIM25 knockout significantly alleviated the inhibition of HeLa cell viability and apoptosis induced by berberine. Further studies showed that berberine reduced the protein levels of TRIM25 and its substrate KLF5 in HeLa cells. Conclusions TRIM25 is a potential anti-tumor target of berberine, and berberine can induce the apoptosis of cervical cancer HeLa cells dependent on TRIM25. © 2023 Publication Centre of Anhui Medical University. All rights reserved.     

Mediation of mitochondrial translocator protein by tanshinone ⅡA in apoptosis of HepG2 cells北大核心CSCD

Aim To investigate the role of mitochondrial translocator protein(TSPO)in the apoptosis of HepG2 cells induced by tanshinone IIA(Tan II A)and the involved mechanism. Methods Following the HepG2 cells treated with Tan ⅡA at 2.5, 5 and 10 μmol·L-1, the cell viability was determined by MTT assay, and intracellular ATP content was determined by luciferin-luciferase method. Oxygen utilization was measured polarographically with a Clark oxygen electrode. Cell apoptosis was determined by Hoechst 33342 staining and flow cytometry. The mitochondrial membrane potential was assessed with JC-1 staining. The intracellular distribution of TSPO was examined by TSPO immunostaining, and the expressions of TSPO, Cyto C, caspase-3, caspase-9 were determined by immunoblotting analysis. Results Tan II A inhibited the proliferation of HepG2 cells in a dose-and time-dependent manner. The treatment with Tan II A inhibited ATP production and oxygen utilization of mitochondria. In addition, Tan ⅡA enhanced TSPO expression and accumulation in nuclei and up-regulated the expression of Cyto C, caspase-3 and caspase-9. Conclusions Tan II A induces the apoptosis of HepG2 cells, which may be related to the TSPO-mediated mitochondrial dysfunction. © 2023 Publication Centre of Anhui Medical University. All rights reserved.     

Research progress of Gasdermin D北大核心CSCD

Pyroptosis is a novel process of programmed inflammatory necrosis, which is closely related to microbial infections and autoimmune diseases. In recent years it has been proved that Gasdermin D is an executive protein of pyroptosis. Cleaved Gasdermin D leads to the formation of pores in cell membrane to induce pyroptosis, and the release of inflammatory factors such as IL-1β and IL-18 aggravates the occurrence of inflammatory responses. With the deepening of Gasdermin D research, it is gradually clear its protein structure and activation sites, which has other activation pathways apart from inducing inflammasome activation. Activation of Gasdermin D does not necessarily mean cell death, even if it could induce the formation of pores in cell membrane and regulation of inflammatory cytokine secretion. These findings offer insight into Gasdermin D function and change our understanding of pyroptosis and programmed necrosis. The recent progress of Gasdermin D is highlighted in this review. © 2023 Publication Centre of Anhui Medical University. All rights reserved.     

Effects of overexpression of IncRNA AC079466.1 on apoptosis of NSCLC cells through endoplasmic reticulum stress signaling pathway北大核心CSCD

目的初步探讨lncRNA AC079466.1在非小细胞肺癌(non-small cell lung cancer,NSCLC)组织和细胞中的表达,及其过表达对A549和H1299细胞增殖、凋亡、迁移、侵袭的影响。方法收集20例NSCLC患者癌组织及相应的癌旁组织,qRT-PCR检测lncRNA AC079466.1在组织和细胞中的表达。转染过表达质粒为AC079466.1组,转染空质粒为NC组,无转染为Blank组。MTT、流式细胞术、Transwell检测过表达lncRNA AC079466.1对A549和H1299细胞活力、凋亡、迁移和侵袭的影响;Western blot检测过表达lncRNA AC079466.1对内质网应激相关因子GRP78、PERK、eIF2α、ATF4、CHOP,以及Bax、caspase-3表达的影响。结果与癌旁组织相比,癌组织中lncRNA AC079466.1的表达水平明显降低;与HBE细胞相比,lncRNA AC079466.1在A549和H1299细胞的表达量明显降低。与Blank组和NC组相比,AC079466.1组A549和H1299细胞的活力、迁移、侵袭能力均明显下降,凋亡率明显升高,内质网应激相关因子GRP78、p-PERK、eIF2α、ATF4、CHOP,以及Bax、caspase-3表达均明显上调。结论过表达lncRNA AC079466.1可明显抑制A549和H1299细胞的活力、迁移和侵袭能力,并促进细胞的凋亡,其机制可能与促进内质网应激介导的细胞凋亡有关。     

Gabapentin effectively alleviates pain sensitization and regulates CACNA2D1 expression in postherpetic neuralgia rats北大核心CSCD

Aim To identify the molecular target of gabapentin in the treatment of postherpetic neuralgia(PHN). Methods The molecular target of gabapentin for PHN was analyzed by network pharmacology and molecular docking and confirmed by coprecipitation test. Rats were randomly divided into control group, model group, model+50 mg·kg-1 gabapentin group, model+100 mg·kg-1 gabapentin group, and model+200 mg·kg-1 gabapentin group, with nine rats in each group. The pain-related behaviors of the rats were measured at different time points. The mRNA and protein expressions of CACNA2D1, Bax, and Bcl-2 in rat spinal cord were determined by immunofluorescence, Western blot, and qPCR. Results CACNA2D1 was the target gene of gabapentin that determined via network pharmacology, molecular docking, and co-precipitation tests. After modeling, mechanical pain threshold and thermal pain threshold significantly decreased, and the number of apoptotic GABA cells significantly increased. However, after intraperitoneal injection of 50, 100, and 200 mg·kg-1 gabapentin, mechanical pain threshold and thermal pain threshold significantly increased(P<0.05), and the number of apoptotic GABA cells significantly decreased(P<0.01). Immunofluorescence and Western blot results showed that compared with the model group, with the increase of gabapentin concentration, the positive expression rate of Bax significantly decreased, and the positive expression rate of Bcl-2 and CACNA2D1 significantly increased. The mRNA expression levels of Bax, Bcl-2 and CACNA2D1 detected by qPCR were consistent with the results of immunofluorescence and Western blot. Conclusions Gabapentin up-regulates the expression of target protein CACNA2D1, inhibits the proapoptotic protein Bax, and promotes the expression of apoptotic inhibitor Bcl-2. © 2023 Publication Centre of Anhui Medical University. All rights reserved.     

吗啡对急性心肌缺血大鼠的作用及机制研究北大核心CSCD

目的研究吗啡对急性心肌缺血大鼠心肌损伤的影响及其机制。方法按照体重将SD大鼠随机分为3组:假手术组、模型组、实验组,每组20只。以诱导局部心肌缺血再灌注法建立大鼠急性心肌损伤模型。在大鼠心肌缺血模型再灌注后,实验组大鼠静脉注射吗啡3 mg·kg^(-1),每天1次,连续5 d;假手术组和模型组静脉注射等量生理盐水。通过超声心动图确定射血分数和左心室缩短分数,氯化三苯基四氮唑(TTC)法检测心肌梗死面积,酶联免疫吸附实验检测大鼠血清中乳酸盐脱氢酶(LDH)、超氧化物歧化酶(SOD)和丙二醛(MDA)的含量,末端标记(TUNEL)染色法检测心肌细胞凋亡,蛋白质印迹法检测心肌组织中磷酸化的JNK(p-JNK)、磷酸化的p38(p-p38)的蛋白表达。结果假手术组、模型组、实验组大鼠心肌射血分数分别为(81.21±2.14)%,(42.56±3.84)%和(61.43±4.89)%;这3组大鼠左心室缩短分数分别为(67.51±5.14)%,(40.11±3.55)%和(50.18±4.78)%;这3组大鼠心肌梗死面积分别为(5.01±0.18)%,(57.34±3.64)%和(23.78±1.98)%;这3组大鼠血清中LDH的含量分别为(5.34±0.26),(28.79±1.67)和(15.64±1.24)nmol·mL^(-1);这3组大鼠血清中MDA的含量分别为(0.78±0.04),(1.89±0.14)和(1.13±0.10)nmol·mL^(-1);这3组大鼠血清中SOD的含量分别为(10.59±0.98),(3.85±0.27)和(6.52±0.43)U·mL^(-1);这3组细胞凋亡率分别为(10.21±0.98)%,(34.65±2.89)%和(26.46±2.34)%;这3组p-JNK蛋白水平分别为0.26±0.02,0.68±0.06和0.35±0.03;这3组p-p38蛋白水平分别为0.31±0.03,0.79±0.07和0.42±0.04。上述指标:模型组与假手术组比较,差异均有统计学意义(均P<0.05);实验组与模型组比较,差异均有统计学意义(均P<0.05)。结论吗啡可减轻急性缺血大鼠的心肌损伤,其机制与抑制JNK/p38信号通路相关。     

Effects of salidroside on proliferation,migration, invasion and apoptosis of 97H cells北大核心CSCD

目的探究红景天苷对人高转移性肝癌细胞(97H细胞)增殖、迁移、侵袭和凋亡的影响。方法采用多功能细胞分析仪检测红景天苷对97H细胞增殖的影响,划痕实验检测红景天苷对97H细胞迁移能力的影响,Transwell小室实验检测红景天苷对97H细胞侵袭能力的影响,倒置显微镜观察红景天苷对97H细胞形态的影响,透射电镜观察红景天苷对97H细胞中线粒体的影响,流式细胞术检测红景天苷对97H细胞凋亡及周期分布的影响,q-PCR技术检测红景天苷对97H细胞中相关凋亡基因的影响,蛋白免疫印迹技术检测红景天苷对97H细胞相关迁移、侵袭及凋亡蛋白的影响。结果与空白组相比,红景天苷处理组对97H细胞的增殖、迁移及侵袭均具有一定的抑制作用,且诱导97H细胞凋亡。红景天苷可以上调Caspase-3基因的相对表达(P<0.05),且可以上调E-cad、Bax、Caspase-3及Caspase-9蛋白的相对表达(P<0.05),下调N-cad、Girdin及Bcl-2蛋白的相对表达(P<0.05)。结论红景天苷对97H细胞的增殖、迁移及侵袭均具有抑制作用,且通过线粒体途径诱导97H细胞凋亡。     

GPER inhibitor increases tamoxifen-induced apoptosis in T-47DTR-resistant cells北大核心CSCD

Aim To study the effect of G protein-coupled estrogen receptor(GPER)inhibitor G15 on the sensitivity of breast cancer tamoxifen-resistant cells to T-47DTR. Methods Experiments were carried out with 4-hydroxytamoxifen(4-OHT),the active form of tamoxifen in vivo. The sensitivity of tamoxifen-resistant breast cancer cell line T-47DTR and its parental cell line T-47D to tamoxifen was detected by MTT assay; the expression of GPER protein was analyzed by plasma separation of inhibitor G15; the effect of 4-OHT combined with G15 on the apoptosis of T-47DTR cells was analyzed by flow cytometry AnnexinV-FITC/PI double staining; the expression levels of apoptosis-related proteins Bax,Bcl-2,caspase-3,cleaved caspase-3,caspase-9,cleaved caspase-9 were analysed by Western blot. Results(1)Compared with the parental cell T-47D,the resistance of T-47DTR-resistant cells to 4-OHT was significantly enhanced.(2)When 4-OHT(2 μmol·L-1)was administered,the membrane distribution of GPER increased,indicating that GPER was activated in T-47DTR-resistant cells compared with the control group; Compared with OHT,the use of G15(5 μmol·L-1)and OHT significantly reduced the expression of GPER.(3)GPER inhibitor G15 could increase the apoptotic rate of T-47DTR-resistant cells while down-regulating the anti-apoptotic protein Bcl-2 and up-regulating the expression of pro-apoptotic proteins Bax,cleaved caspase-3,cleaved caspase-9. Conclusions The GPER inhibitor G15 increases the apoptosis of T-47DTR cells and restores the sensitivity of drug-resistant cells to tamoxifen. © 2023 Publication Centre of Anhui Medical University. All rights reserved.     

柴胡皂苷D通过NOB1影响血管瘤内皮细胞凋亡北大核心CSCD

目的研究柴胡皂苷D对血管瘤内皮细胞凋亡的影响和机制。方法将人血管瘤内皮细胞分成对照组、实验组、pcDNA-NC组、pcDNA-NOB1组、实验组+pcDNA-NC组、实验组+pcDNA-NOB1组。对照组细胞正常培养;实验组在0 h时给予80μmol·L^(-1)的柴胡皂苷D处理;pcDNA-NC组、pcDNA-NOB1组在实验前24 h分别转染pcDNA-NC、pcDNA-NOB1;实验组+pcDNA-NC组、实验组+pcDNA-NOB1组转染后在0 h时用80μmol·L^(-1)的柴胡皂苷D处理。以MTT实验检测细胞增殖,以流式细胞术检测凋亡,以蛋白质印迹法(Western blot)检测NOB1、细胞色素C(Cyt C)蛋白表达。结果对照组、实验组血管瘤内皮细胞中NOB1蛋白表达量分别为0.78±0.10和0.40±0.05,差异有统计学意义(P<0.05)。对照组、实验组、实验组+pcDNA-NC组、实验组+pcDNA-NOB1组血管瘤内皮细胞增殖活力(OD值)分别为0.53±0.06,0.26±0.04,0.27±0.03和0.34±0.02;这4组的凋亡率为(6.35±0.58)%,(20.34±2.62)%,(19.87±1.94)%和(8.61±1.05)%;这4组的胞浆中Cyt C蛋白表达量分别为0.22±0.03,0.45±0.05,0.42±0.05和0.30±0.03。上述指标,实验组与对照组比较,差异有统计学意义(P<0.05);实验组+pcDNA-NOB1组与实验组+pcDNA-NC组比较,差异有统计学意义(P<0.05)。结论柴胡皂苷D通过下调NOB1激活线粒体凋亡途径诱导血管瘤内皮细胞凋亡。     

Daidzein affects proliferation and apoptosis in non-small cell lung cancer cells:role of p53 signaling pathway北大核心CSCD

Aim To investigate the effects of daidzein（DD） on the proliferation and apoptosis of non-small cell lung cancer cells,with a focus on the possible role of the p53 signaling pathway in this regard. Methods CCK-8 method and flow cytometry were used to detect the effects of soy isoflavone crude extract and DD on the viability and apoptosis of HELF and H1299 cells. Gene microarray was used to detect the changes in gene expression after treatment of H1299 cells with DD. GSEA and differential analysis were used to screen the major pathways and key genes. RT-qPCR and Western blot were performed to verify the differences in mRNA and protein expression of key genes（p53 and CASP9） in the major pathways. After p53 inhibitor Pifithrin-α inhibited the expression of p53,the effect of DD on p53 mRNA and protein expression levels was examined,and the proliferative effect on H1299 cells was observed. Results Soy isoflavone crude extract and DD promoted proliferation and inhibited apoptosis of normal lung cells and inhibited proliferation and promoted apoptosis of lung cancer cells. p53 signaling pathway was significantly enriched in the DD-treated group（NES=1.78,P=0.000）,and the expressions of p53 and CASP9 genes were found to be significantly up-regulated in the treated group. Compared with the control group,mRNA expression of CASP9 and p53 significantly increased in both HELF and H1299 cells treated with DD（P<0.05）,and p53 protein expression also increased in HELF cells（P<0.05）. After inhibition of p53 expression,DD significantly increased the mRNA expression of p53 in H1299 and HELF cells（P<0.05） and also markedly increased the expression of p53 protein in H1299 cells（P<0.05）,and it was observed that DD inhibited the proliferation of lung cancer cells. Conclusions DD inhibits the proliferation and promotes the apoptosis of lung cancer H1299 cells,and the mechanism mainly involves the p53 signaling pathway. © 2023 Publication Centre of Anhui Medical University. All rights reserved.     

γ-Secretase inhibitor DAPT sensitizes t-AUCB-induced apoptosis of human glioblastoma cells in vitro via blocking the p38 MAPK/MAPKAPK2/Hsp27 pathway

Aim： Trans-4-[4-（3-adamantan-1-yl-ureido）-cyclohexyloxy]-benzoic acid （t-AUCB） is a soluble epoxide hydrolase inhibitor that suppresses glioblastoma cell growth in vitro. The aim of this study was to examine whether the γ-secretase inhibitor N-[N-（3,5-difluorophenacetyl）-l-alanyl]-S-phenylglycine t-butyl ester （DAPT） could sensitize glioma cells to t-AUCB-induced apoptosis.
Methods： Both U251 and U87 human glioblastoma cell lines were tested. Cell growth was assessed using the cell counting kit-8. Cell apoptosis was detected with caspase-3 activity assay kits and flow cytometry. The protein levels in the p38 MAPK/MAPKAPK2/Hsp27 pathway in the cells were analyzed using Western blots.
Results： Pretreatment with DAPT （2 μmol/L） substantially potentiated the growth inhibition caused by t-AUCB （200 μmol/L） in U251 and U87 cells. Furthermore, pretreatment with DAPT markedly increased t-AUCB-induced apoptosis of U251 and U87 cells. T-AUCB alone did not significant affect caspase-3 activity in the cells, but t-AUCB plus DAPT pretreatment caused significant increase of caspase-3 activity. Furthermore, pretreatment with DAPT completely blocked t-AUCB-induced phosphorylation of p38 MAPK, MAPKAPK2 and Hsp27 in the cells.
Conclusion： The γ-secretase inhibitor DAPT sensitizes t-AUCB-induced apoptosis of human glioblastoma cells in vitro via blocking the p38 MAPK/MAPKAPK2/Hsp27 pathway, suggesting that the combination of t-AUCB and DAPT may be a potentially effective strategy for the treatment of glioblastoma.     

Molecular mechanism of a Matijin-su derivative for inhibiting proliferation,invasion and migration of prostate cancer cells北大核心CSCD

目的探讨马蹄金素衍生物HXL130对前列腺癌PC3细胞的增殖、侵袭及迁移的影响及其分子机制。方法采用MTT法检测HXL130对PC3细胞增殖的影响,Hoechst 33258染色和流式细胞术检测对癌细胞凋亡以及对其细胞周期的影响,运用Transwell法检测对癌细胞侵袭与迁移的影响;运用蛋白组学测序技术检测化合物处理癌细胞引起的差异表达蛋白(DEPs),分析DEPs的功能及其调控的相关信号通路,并运用Western blot进行验证。结果PC3细胞成活率随着HXL130浓度和时间的增加而降低,且可明显的诱导细胞凋亡和阻滞G 2期,并可明显的抑制PC3细胞的侵袭和迁移能力;蛋白质组学分析表明,HXL130处理癌细胞引起67个蛋白发生差异表达,包括51个上调蛋白和16个下调蛋白,其主要参与PI3K-AKT、MAPK、细胞凋亡及内质网蛋白处理相关信号通路;Western blot结果研究表明HXL130可明显促进细胞中上述信号通路中的关键蛋白PERK、p-elF2α、CHOP、Bax蛋白表达,抑制Bcl-2、MMP1和VEGF的蛋白表达。结论马蹄金素衍生物HXL130可抑制PC3细胞的增殖和转移,其分子机制主要涉及到PI3K-AKT、MAPK、细胞凋亡及内质网蛋白处理相关信号通路的调控。     

红藻氨酸对小胶质细胞凋亡的影响北大核心CSCD

目的研究红藻氨酸(KA)对BV2小胶质细胞的增殖和凋亡的影响及机制。方法用KA诱导的BV2小胶质细胞模型。将BV2细胞分为对照组和KA组。对照组用正常的培养基培养,KA组用含600μmol·L^(-1)KA的培养基培养。以酶联免疫吸附试验检测肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL^(-1)β)和IL-6水平,以蛋白质印迹法检测半胱天冬酶3(Caspase-3)、Caspase-9和p53表达水平,以钙成像实验测定细胞内Ca^(2+)浓度。结果KA组的24 h TNF-α、IL-1β、IL-6的含量分别为(130.60±9.22)、(9.83±1.10)和(73.79±11.26)pg·mL^(-1)。对照组和KA组小胶质细胞中Caspase-3蛋白相对表达水平分别为1.00±0.06和1.22±0.09,Caspase-9蛋白相对表达水平分别为1.00±0.14和1.44±0.12,p53蛋白相对表达水平分别为1.00±0.14和1.34±0.13,Ca^(2+)水平分别为1.18±0.29和5.26±0.47。KA组的上述指标与对照组比较,差异均有统计学意义(均P<0.05)。结论KA可以激活小胶质细胞促进其释放炎症因子,高浓度KA可促进BV2小胶质细胞的凋亡,其机制可能与细胞内钙离子升高有关。     

EGCG对帕金森病神经保护作用机制研究进展北大核心CSCD

表没食子儿茶素没食子酸酯(Epigallocatechin 3-gallate,EGCG)是一种来源于绿茶提取物的丰富多酚成分,具有多种药理活性。EGCG在帕金森病(Parkinson′s disease,PD)的实验模型中具有多种神经保护作用,成为PD治疗的潜在药物。该文系统总结了EGCG在PD中神经保护的最新进展,重点归纳了其在抗凋亡、抗氧化、抗炎、调节多巴胺生成以及α-突触核蛋白聚集方面的分子机制。该综述强调了EGCG的药理学特征及其对PD的治疗作用,以期为深入研究提供启示意义。     

脱氢枞胺对氟苯甲醛激活JNK/P38通路诱导人肝癌HepG2细胞凋亡北大核心CSCD

目的研究脱氢枞胺对氟苯甲醛(DHAA-F)对人肝癌Hep G2细胞存活的影响,探讨其诱导细胞凋亡作用机制。方法用不同浓度DHAA-F处理Hep G2细胞24,48和72 h,CCK-8法检测细胞存活;DHAA-F20,40和80μmol·L^(-1)处理Hep G2细胞24 h,荧光显微镜观察细胞形态的变化,Annexin V-FITC/PI双染检测细胞凋亡,Western蛋白印迹法检测凋亡相关蛋白BCL-2、BAX、活化的胱天蛋白酶9和胱天蛋白酶3蛋白表达水平,以及丝裂原激活蛋白激酶(MAPK)家族中ERK,JNK和P38蛋白的表达。结果与细胞对照组比较,DHAA-F可显著抑制细胞存活(P<0.01),24,48和72 h的IC50值分别为56.8±4.4,40.2±3.4和24.2±2.4μmol·L^(-1);DHAA-F 20,40和80μmol·L^(-1)作用24 h后,核固缩程度加深,PI染色增多,细胞凋亡率明显增加(P<0.01),由细胞对照组的(6.4±0.6)%分别增加至(12.3±1.7)%,(28.8±3.2)%和(61.8±4.6)%;DHAA-F可以增加Hep G2细胞中JNK和P38蛋白的磷酸化(P<0.01),引起BCL-2表达下调(P<0.01)、BAX及活化的胱天蛋白酶9和胱天蛋白酶3表达上调(P<0.01);与DHAA-F组相比,P38MAPK抑制剂SB203580和JNK抑制剂SP600125可逆转DHAA-F引起的BCL-2表达下调、BAX表达上调和胱天蛋白酶3的活化(P<0.01)。结论 DHAA-F可通过激活JNK/P38通路诱导人肝癌Hep G2细胞发生凋亡。     

丙酮酸钠对小鼠海马神经HT22细胞神经保护作用北大核心CSCD

目的研究丙酮酸钠(sodium pyruvate,SP)在低氧条件下对小鼠海马神经细胞HT22的神经保护作用。方法在低氧条件下,用MTS检测不同浓度SP孵育HT22细胞的活性变化;从形态学上,采用铁染色观察SP对HT22细胞的影响;应用溶酶体染色检测SP对HT22细胞的溶酶体变化;采用Western blot检测Bcl-2、Bax和LC3-Ⅱ/LC3-Ⅰ蛋白的表达。结果5 mmol·L^(-1)的SP能提高HT22细胞活力以及减少HT22细胞损伤;SP提高Bcl-2的表达,降低Bax的表达,使LC3-Ⅱ/LC3-Ⅰ比值增加。结论在低氧的条件下给予SP可能通过减少HT22细胞凋亡,激活自噬发挥神经保护作用,从而降低低氧损伤。     

醋酸铅对PC12细胞的增殖与凋亡研究北大核心CSCD

目的探讨醋酸铅(Pb(Ac)2)对大鼠肾上腺嗜铬细胞瘤PC12细胞的增殖与凋亡中低氧诱导因子-1α(hypoxia inducible factor-1α, HIF-1α)与Rho关联卷曲螺旋蛋白激酶(rho associated coiled coil forming protein kinase, ROCK)信号通路的关系以及潜在的作用机制。方法 (1)将体外培养的PC12细胞分为对照组和实验组。对照组加入含血清的培养基,低、中、高剂量实验组加入100,200,400μmol·L-1的Pb(Ac)2染毒,用噻唑蓝还原法测定药物对细胞增殖率的影响,以乳酸脱氢酶(lactate dehydrogenase, LDH)漏出率试剂盒检测细胞损伤程度,用DCFH-DA探针染色法检测细胞内活性氧(reactive oxygen species, ROS)水平,用Annexin V-FITC/PI细胞凋亡检测试剂盒检测细胞凋亡率,以蛋白质印迹法检测细胞内HIF-1α、 ROCK-1、ROCK-2、淋巴瘤/白血病-2(B cell lymphoma/lewkmia-2,Bcl-2)以及Bcl-2相关X蛋白(Bcl-2 Associated X Protein, Bax)的蛋白表达。(2)采用siRNA技术沉默PC12细胞HIF-1α基因技术,将细胞分为对照组、实验组、阴性对照组、干扰组,观察细胞中HIF-1α、ROCK-1,ROCK-2蛋白表达水平的变化。结果随着Pb(Ac)2剂量的增大,药物对PC12细胞的损伤作用加深。对照组和高剂量实验组的存活率分别为(100.00±3.22)%,(47.21±4.98)%,差异有统计学意义(P<0.01)。与对照组相比,中、高2个剂量实验组细胞凋亡率差异有统计学意义(P<0.01),表明Pb(Ac)2诱导细胞凋亡。Pb(Ac)2可上调细胞内HIF-1α、ROCK-1、ROCK-2、Bax/Bcl-2的蛋白表达比例(均P<0.01)。当采用小RNA干扰HIF-1α后,发现醋酸铅对PC12细胞损伤的程度降低,HIF-1α、ROCK-1、ROCK-2的蛋白表达水平下降(均P<0.01)。结论 Pb(Ac)2诱导PC12细胞发生凋亡可能与HIF-1α和ROCK信号通路的表达以及自由基损伤有关。     

Effects of lentinan on dendritic cell metabolism北大核心CSCD

Aim To study the effects of lentinan(LNT)on the metabolism of dendritic cells(DCs)by metabonomics, and uncover the potential mechanism of its regulation of DC function. Methods DC2.4 cells were co-incubated with LNT for 24 h, and the activity of the cells was detected by thiazolyl blue tetrazolium bromide(MTT)assay. The contents of interleukin-6(IL-6), tumor necrosis factorα(TNF-α)and interleukin-12(IL-12)in supernatant were detected by enzyme-linked immunosorbent assay(ELISA). The metabolic general changes of DC2.4 cells were detected by Ultra performance liquid chromatography-quadrupole time-of-flight mass spectrometry(UPLC-QTOF/MS), and the differential metabolites were analyzed by multi-distance covariates and bioinformatics, partial least squares-discriminant analysis(PLS-DA). Finally, metabolic pathway analysis was performed by MetaboAnalyst 5.0. Results LNT did not significantly inhibit the activity of DC2.4 cells at the dose of 25～100 mg·L-1. LNT(100 mg·L-1)could significantly stimulate the secretion of IL-6, TNF-α and IL-12 in DC2.4 cells. 20 differential metabolites were identified in DC2.4 cells after being stimulated by LNT(100 mg·L-1), which involved 25 metabolic pathways including urea cycle, arginine and proline metabolism. Conclusion The regulation of LNT on DC function involves a variety of amino acid metabolism. © 2023 Publication Centre of Anhui Medical University. All rights reserved.