miR-199a-5p下调NF-κB信号通路激活水平抑制宫颈癌细胞恶性生物学行为

目的探讨miR-199a-5p对宫颈癌细胞生长、侵袭和迁移的影响和机制。方法 Real-time PCR测定miR-199a-5p在宫颈癌HeLa、HCC94、Ca Ski细胞和正常宫颈Ect1/E6E7细胞中的表达差异。在宫颈癌细胞中转染miR-199a-5p mimics,real-time PCR检测过表达效果,MTT检测增殖,克隆形成实验测定克隆形成能力,Transwell小室测定侵袭和迁移能力,Westernblot检测细胞中p-p65、p-IκB蛋白表达变化。使用核因子-κB(NF-κB)激活剂PMA处理转染miR-199a-5p mimics后的宫颈癌细胞,同样使用上述方法测定细胞生长、克隆、侵袭和迁移能力变化。结果 miR-199a-5p在宫颈癌HeLa、HCC94、CaSki细胞中的表达水平低于正常宫颈Ect1/E6E7细胞。miR-199a-5p mimics提高宫颈癌细胞中miR-199a-5p表达水平,降低细胞增殖、克隆、侵袭和迁移能力,减少细胞中p-p65、p-IκB蛋白表达。NF-κB激活剂PMA可以逆转miR-199a-5p对宫颈癌细胞增殖、克隆、侵袭和迁移能力的抑制作用。结论 miR-199a-5p通过下调NF-κB信号通路激活水平抑制宫颈癌细胞生长、侵袭和迁移。     

miR-107抑制胶质瘤细胞的体外增殖、迁移和侵袭

目的探讨miR-107对胶质瘤细胞增殖、迁移和侵袭的调控机制。方法运用RT-qPCR检测人正常的星形胶质细胞系NHA、神经胶质瘤细胞系U87、A172、U251中miR-107和FOXK1的表达;将细胞分为miR-NC组(转染miR-NC)、miR-107组(转染miR-107 mimics)、si-NC组(转染si-NC)、si-FOXK1组(转染si-FOXK1)、miR-107+pcDNA3.1组(共转染miR-107 mimics和pcDNA3.1)和miR-107+pcDNA3.1-FOXK1组(共转染miR-107 mimics和pcDNA3.1-FOXK1);用脂质体法分别转染至U87细胞;CCK-8法检测细胞的增殖;Transwell小室实验检测细胞的迁移和侵袭;Western blot检测细胞中FOXK1的蛋白表达;双荧光素酶报告基因检测实验检测细胞的荧光活性。结果与正常的星形胶质细胞NHA相比,神经胶质瘤细胞U87、A172、U251中miR-107表达明显下调,FOXK1表达明显上调(P<0.05);过表达miR-107、敲减FOXK1均可抑制U87细胞的增殖、迁移和侵袭;miR-107可抑制野生型FOXK1的细胞荧光活性,并负向调控FOXK1的表达;过表达FOXK1可逆转miR-107对U87细胞增殖迁移侵袭的抑制作用。结论 miR-107抑制胶质瘤细胞增殖、迁移和侵袭的作用机制可能与靶向负调控FOXK1有关,将可为胶质瘤的诊断和治疗提供靶向治疗的依据。     

过表达miR-217调控EZH2促进骨质疏松模型小鼠BM-MSCs成骨分化

目的 探究微小RNA-217(miR-217)对骨质疏松症(OP)模型小鼠骨髓间充质干细胞(BM-MSCs)成骨分化的影响及其可能调控机制。方法 将小鼠分为OP组、假手术(sham)组,各12只,均进行了双侧卵巢切除术。将OP小鼠BM-MSCs分为对照组、miR-NC组、miR-217 mimics组、miR-217 mimics+pcDNA 3.1组、miR-217 mimics+pcDNA 3.1-EZH2(果蝇zeste基因增强子同源物2)组,分别不做转染、转染miR-NC、转染miR-217 mimics、转染miR-217 mimics及pcDNA 3.1、转染miR-217 mimics及pcDNA 3.1-EZH2,之后进行成骨诱导分化。RT-qPCR/Western blot检测miR-217及EZH2、OCN、Runx2、collagenⅠmRNA和蛋白表达情况;酶标仪检测各组BM-MSCs碱性磷酸酶(ALP)活性;利用茜素红S(ARS)染色测定法对各组BM-MSCs进行染色,观察染色情况;双荧光素酶报告基因验证miR-217与EZH2的靶向关系。结果 OP组小鼠骨组...     

miR-874-3p靶向GALNT4调控宫颈癌细胞增殖与凋亡的分子机制研究北大核心CSCD

目的:研究miR-874-3p是否通过靶向GALNT4影响宫颈癌细胞增殖和凋亡。方法:qRT-PCR和Western blot检测宫颈癌细胞系miR-874-3p、GALNT4 mRNA和GALNT4蛋白表达。HeLa细胞转染miR-874-3p或si-GALNT4,Western blot检测GALNT4、细胞周期蛋白D1(CyclinD1)、Cleaved-Caspase-3、β-catenin表达,CCK-8检测细胞增殖,流式细胞术检测细胞凋亡。starBase预测与双荧光素酶活性检测分析miR-874-3p和GALNT4的靶向关系。共转染miR-874-3p和pcDNA-GALNT4,观察过表达GALNT4对miR-874-3p过表达诱导的HeLa细胞增殖和凋亡的影响。结果:与宫颈上皮永生化细胞H8相比,宫颈癌SiHa、HeLa、Caski细胞miR-874-3p表达降低,GALNT4 mRNA和蛋白表达增加(P<0.05)。过表达miR-874-3p降低HeLa细胞CyclinD1、β-catenin蛋白表达及细胞增殖率,提高Cleaved-Caspase-3蛋白表达和凋亡率(P<0.05)。抑制GALNT4表达降低HeLa细胞CyclinD1蛋白表达及增殖率,提高Cleaved-Caspase-3蛋白表达和细胞凋亡率(P<0.05)。miR-874-3p靶向调控GALNT4表达。过表达GALNT4可部分反转miR-874-3p过表达对宫颈癌HeLa细胞增殖、CyclinD1、β-catenin蛋白表达的抑制作用,及对细胞凋亡、Cleaved-Caspase-3蛋白表达的促进作用。结论:miR-874-3p通过靶基因GALNT4调控Wnt/β-catenin信号通路,抑制宫颈癌细胞增殖,并诱导其凋亡。     

抑制lncRNA LINC01503通过靶向调控miR-335-5p对肺癌细胞活力、迁移和侵袭的影响及其机制研究

目的:探讨长链非编码RNA(lncRNA)LINC01503对肺癌细胞活力、迁移和侵袭的影响及其作用机制。方法:将人肺癌H1299细胞分为si-NC组(转染si-NC)、si-LINC01503组(转染si-LINC01503)、pcDNA组(转染pcDNA)、pcDNA-LINC01503组(转染pcDNA-LINC01503)、miR-NC组(转染miR-NC)、miR-335-5p组(转染miR-335-5p mimics)、si-LINC01503+anti-miR-NC组(共转染si-LINC01503和anti-miR-NC)、si-LINC01503+anti-miR-335-5p组(共转染si-LINC01503和anti-miR-335-5p)、miR-NC+WT-LINC01503组(共转染miR-NC和WT-LINC01503)、miR-NC+MUT-LINC01503组(共转染miR-NC和MUT-LINC01503)、miR-335-5p+WT-LINC01503组(共转染miR-335-5p和WT-LINC01503)和miR-335-5p+MUT-LINC...     

circCBLB抑制类风湿性关节炎成纤维细胞样滑膜细胞增殖促进细胞凋亡并增加抗炎细胞因子水平

目的 探讨环状RNA Cbl原癌基因B(circCBLB)/miR-486-5p功能轴对类风湿性关节炎成纤维细胞样滑膜细胞(RA-FLS)增殖、凋亡及炎症因子产生的影响。方法 人RA-FLS,用100μL的10 ng/mL肿瘤坏死因子α(TNF-α)刺激RA-FLS建立模型。采用双荧光素酶靶向验证circCBLB/miR-486-5p的结合关系。构建pcDNA3.1/siRNA-circCBLB、阴性对照(pcDNA3.1-NC/si-NC)和mimics-miR-486-5p,分别转染至RA-FLS。实验分为对照组、 TNF-α处理的RA-FLS、 pcDNA3.1-circCBLB组、 pcDNA3.1-NC组、 si-circCBLB组、 si-NC组、 pcDNA3.1-circCBLB联合miR-486-5p-mimics组。采用CCK-8法检测细胞活力,流式细胞术检测细胞周期与细胞凋亡,平板集落形成实验检测细胞平板集落形成能力,实时定量PCR检测各组circCBLB、 miR-486-5p表达水平,ELISA检测各组细胞上清液抗炎因子白细胞介素4(IL-4)、 IL-10,...     

miR-195-5p靶向调控ELMO2抑制IL-17诱导的胃癌细胞AGS侵袭和迁移

目的:研究miR-195-5p调控吞噬细胞运动蛋白2(ELMO2)对白介素17(IL-17)诱导的胃癌细胞AGS侵袭和迁移的影响和机制。方法:以胃癌细胞AGS作为实验对象,转染miR-195-5p mimics,给予IL-17处理,qRT-PCR方法测定细胞中miR-195-5p表达;Transwell小室测定细胞侵袭和迁移能力;Western blot测定细胞中E-cadherin、Vimentin蛋白表达水平。生物信息学软件预测miR-195-5p的靶基因可能为ELMO2,双荧光素酶系统鉴定靶向关系。在胃癌细胞AGS中共转染miR-195-5p mimics、pcDNA3.1-ELMO2,检测细胞侵袭和迁移能力变化。结果:IL-17处理后的胃癌细胞AGS中miR-195-5p表达水平下调,细胞侵袭和迁移能力升高,细胞中E-cadherin蛋白表达水平下降,Vimentin蛋白表达水平升高。转染miR-195-5p mimics后的细胞经过IL-17处理以后,细胞中miR-195-5p表达水平升高,细胞侵袭和迁移能力降低,细胞中E-cadherin蛋白表达水平升高,Vimentin蛋...     

miR-105靶向负调控KIFC1抑制非小细胞肺癌细胞增殖、迁移和侵袭能力

目的:研究微小RNA-105(miR-105)对非小细胞肺癌细胞增殖、迁移和侵袭的影响,并探讨其机制。方法:运用RT-qPCR法检测非小细胞肺癌组织及癌旁组织和细胞中miR-105和驱动蛋白家族成员C1(KIFC1) mRNA的表达;用Western blot检测非小细胞肺癌组织及癌旁正常组织和细胞中KIFC1蛋白的表达。将细胞分为miR-105组(转染miR-105 mimics)、miR-NC组(转染mimics阴性对照序列)、inhibitor-NC组(转染inhibitor阴性对照序列)、inhibitor-miR-105组(转染miR-105 inhibitor)、si-NC组(转染阴性对照siRNA)、si-KIFC1组(转染KIFC1 siRNA)、miR-105+vector组(miR-105 mimics和pcDNA 3.1共转染)和miR-105+KIFC1组(miR-105 mimics和pcDNA 3.1-KIFC1共转染),均以脂质体法转染至非小细胞肺癌H460细胞;MTT法检测各组细胞活力;Transwell法检测各组细胞的迁移和侵袭能力;双萤光素酶报告基因检测实验检测各组细胞萤光素酶相对活性。结果:与癌旁组织相比,非小细胞肺癌组织中的miR-105表达显著降低,KIFC1的表达显著升高(P0.05);与人正常胚肺成纤维细胞MRC-5相比,H460细胞中的miR-105表达显著降低,KIFC1的表达显著升高(P0.05);miR-105可降低野生型KIFC1的H460细胞萤光素酶相对活性,且负向调控KIFC1的蛋白表达。过表达miR-105或敲减KIFC1表达均可显著抑制H460细胞的增殖、迁移和侵袭能力,且过表达KIFC1可逆转miR-105对细胞活力、迁移和侵袭能力的抑制作用。结论:miR-105可抑制非小细胞肺癌细胞增殖、迁移和侵袭,其机制与靶向负调控KIFC1的表达有关。     

LINC01352对口腔鳞状细胞癌的影响及其作用机制

目的探讨LINC01352对口腔鳞状细胞癌增殖、迁移与侵袭的影响及其机制。方法培养口腔鳞癌SCC25细胞, 分为LINC01352过表达(pc-LINC01352)组及其阴性对照(pc-NC)组、miR-629-5p mimics组及其阴性对照(miR-NC)组, 将pc-LINC01352、pc-NC、miR-629-5p mimics、miR-NC分别转染相应组的SCC25细胞中。pc-LINC01352组和pc-NC组SCC25细胞转染后, 采用实时荧光定量聚合酶链反应检测细胞中LINC01352、miR-629-5p的相对表达情况, 采用细胞计数试剂盒(CCK)-8检测细胞活力, 采用EdU检测细胞增殖能力, 采用Transwell小室检测细胞侵袭和迁移能力。通过LncRNASNP2在线网站预测LINC01352潜在的下游靶基因及其与LINC01352的结合位点。使用转染后的miR-629-5p mimics组、miR-NC组的SCC25细胞, 采用双荧光素酶报告基因实验验证LINC01352潜在的下游靶基因及其与LINC01352的结合位点。结果 SCC25细胞转染pc-LI...     

微小RNA-98-5p靶向调控核糖核苷酸还原酶小亚基M2调控宫颈癌细胞顺铂的耐药性

目的 探讨微小RNA(miR)-98-5p对顺铂(DDP)耐药宫颈癌细胞顺铂敏感性的调控及其机制.方法 用脂质体法将 DDP+miR-NC 组(转染 miR-NC)、DDP+miR-98-5p 组(转染 miR-98-5p mimics)、DDP+si-NC 组(转染si-NC)、DDP+si-核糖核苷酸还原酶小亚基M...     

Langerhans cells - dendritic cells of the epidermis

Langerhans cells (LC) are dendritic cells of the epidermis. They are highly specialized leukocytes that serve immunogenic and tolerogenic purposes. Here, we review some aspects of LC biology, emphasizing those areas where LC are or may turn out to be special.     

Langerhans cells: antigen presenting cells of the epidermis

While epidermis in the skin provides an excellent barrier to the environment, it is an incomplete one. Some antigenic material can penetrate through the stratum corneum (or be introduced pathologically) where strategically placed epidermal Langerhans cells reside. In this review, we have assembled relevant data concerning the antigen presenting potential of epidermal Langerhans cells. Strong circumstantial evidence derived from in vitro studies of epidermal cell suspensions enriched for Langerhans cells indicates that Langerhans cells possess this capability. In vivo studies with intact skin indicate that critical numbers of functioning Langerhans cells are essential for successful induction of contact hypersensitivity by epicutaneously applied haptens. And within the past several months, experiments with purified preparations of epidermal Langerhans cells have proven that these cells, and perhaps they alone among epidermal cells, possess the capacity of processing and presenting haptenic determinants to the immune system. The challenge for the future is to determine the extent to which this unique property of Langerhans cells affords physiologic protection to the skin and under what pathologic circumstances altered Langerhans cell function leads to disease.     

Mast cells: the forgotten cells of renal fibrosis

BACKGROUND/AIMS: Mast cells, when activated, secrete a large number of fibrogenic factors and have been implicated in the development of fibrotic conditions of the liver, lung, and skin. There is evidence that renal fibrosis is closely linked with a chronic inflammatory cell infiltrate within the interstitium, but a potential role for mast cells in this process has yet to be defined. Therefore, the numbers of mast cells in normal and fibrotic kidneys with various pathologies were investigated. METHODS: Mast cells were quantified in renal transplants showing acute and chronic rejection and cyclosporin toxicity, kidneys removed for chronic pyelonephritis, and renal biopsies from patients with IgA nephropathy, membranous nephropathy, and diabetic nephropathy. Mast cells were stained using two methods: acid toluidine blue detected less than 30% of the mast cells revealed by immunohistochemistry for mast cell tryptase. RESULTS: Mast cells were scarce or absent in normal kidney (median, 1.6 mast cells/mm2) but numerous throughout the cortex and medulla in all specimens that showed fibrosis. They were almost entirely confined to the renal interstitium. Mast cells were present in large numbers in biopsies from patients with membranous nephropathy (median, 21.7 mast cells/mm2) and diabetic nephropathy (median, 29.2 mast cells/mm2), which were selected on the basis of showing chronic injury. In 24 unselected IgA nephropathy biopsies there was a close correlation between numbers of mast cells and the extent of interstitial fibrosis (r = 0.771; p < 0.0001). In renal transplant biopsies, mast cells were associated with allograft fibrosis in chronic rejection (median, 27.1 mast cells/mm2) and chronic cyclosporin toxicity (median, 10.6 mast cells/mm2) but not acute rejection (median, 2.7 mast cells/mm2) or acute cyclosporin toxicity (median, 2.0 mast cells/mm2). There was no detectable increase in mast cell numbers during acute rejection in those transplants that subsequently progressed to chronic rejection. In some biopsies the mast cells were largely intact, but in most cases some or all were degranulated. CONCLUSIONS: An increased number of mast cells is a consistent feature of renal fibrosis, whatever the underlying pathology, and the number of mast cells correlates with the extent of interstitial fibrosis. This suggests that mast cells might play a pathogenetic role in the fibrotic process.     

Hepatoma cells inhibit the differentiation and maturation of dendritic cells and increase the production of regulatory T cells

Tumor cells may escape from the immune responses because of defective differentiation of dendritic cells (DC). Recent studies have found an increased number of regulatory T cells (Treg) in both peripheral blood and tissues from patients with hepatocellular carcinoma. In the present study, we used tumor culture supernatants (TSN) from hepatoma-derived cell lines to investigate whether TSN interfere with the differentiation of human monocyte-derived DC and/or their ability to increase Treg. The results showed that exposure to TSN significantly inhibited the differentiation of monocytes into DC with retained CD14 molecule and reduced expression of CD1a. These TSN-exposed immature DC also produced significant amount of immunosuppressive cytokine IL-10 and displayed an increased expression of co-stimulatory molecules. Upon stimulation with LPS, however, the TSN-exposed DC failed to undergo full maturation, with a blockage of the upregulation of co-stimulatory molecules on their surface and a switch to an IL-10(high)IL-12(low)TNF-alpha(low) phenotype. Moreover, exposure of DC to TSN selectively inhibited their capacity to stimulate the proliferation of allogeneic CD8(+) T cells, but promoted the generation of CD4(+)CD25(hi)Foxp3(+) Treg cells. These findings, together with previous clinical studies showing that CD4(+)CD25(hi) Treg cells are concentrated within hepatocellular carcinoma tissue, suggest that the local tumor microenvironment may favor the induction of Treg cells through inhibiting the differentiation and maturation of DC.     

Endocrine cells and parietal cells in the stomach of the developing rat

Gastrin-immunoreactive cells were fairly numerous in the pancreas and upper duodenum of the rat at about the time of birth. A minor population of these cells stained with antibodies directed against the N-terminal region of gastrin-34 as well as with antibodies directed against the C-terminal region. The remainder of the cells stained with the C-terminally directed antibodies only. Within a fortnight after birth all gastrin-immunoreactive cells disappeared from the pancreas and were greatly reduced in number in the duodenum; those that remained were probably CCK cells. Gastrin cells were rare in the antrum at birth and remained rare during the first days after birth. They increased in number, slowly until after weaning (15-20 days of age) and then more rapidly, until 25-30 days of age when the gastrin cell density reached that in adult rats. At the time of birth the gastrin concentration in serum was low; the subsequent increase during the first 2 weeks paralleled the development of the antral gastrin cell system. Adult postprandial serum gastrin concentrations were reached 12 days after birth. Somatostatin cells were rare in both the antral and oxyntic mucosa at birth. They increased gradually in number until about a month after birth when the cell density reached that seen in adult rats. In the oxyntic mucosa the ECL and A-like cells are the predominant endocrine (argyrophil) cell types. They were not detected until about 4 days after birth. Their number increased slowly until about 30 days of age. They did not stain argyrophil until about 2-4 weeks after birth. Parietal cells were few at birth; ultrastructurally they appeared to be in an active state and histochemically they were shown to contain carbonic anhydrase. The pH of the gastric content of newborn rats was close to 5; 15-17 days after birth the pH was about 4 in freely fed rats. In fasted rats shortly after birth the pH was about 4. Two weeks later it was around 2, which is the pH measured in older rats. Hence, the full capacity for acid secretion is probably not established until weaning. Fasting greatly lowers the serum gastrin concentration and the histidine decarboxylase activity of the ECL cells in adult rats. Before weaning, fasting produced these effects only to a minor degree.(ABSTRACT TRUNCATED AT 400 WORDS)     

从G-CSF动员的外周血细胞悬液培养的成纤维细胞样细胞的特性分析

目的： 研究从G-CSF动员的外周血细胞（PBC）悬液培养的成纤维细胞样（F-L）细胞的特性。 方法： 取PBC中贴壁细胞分4组培养：①RPMI-1640组；②L-DMEM组；③粒细胞集落刺激因子（G-CSF）组；④白细胞介素-3（IL-3）组。流式细胞仪分析各组培养的F-L细胞特性。 结果： 培养2-3周后，4组均能收获到F-L细胞，细胞贴壁生长，但不融合，不能连续传代培养，③④组细胞数量明显多于①②组，4组F-L细胞表型相似：CD33+、CD11c+、CD64+、CD14+、CD45+、HLA-DR+、CD86+、CD34-、CD38-、CD3-、CD19-、CD56-、CD29-、CD44-、CD105-；与单核细胞（PB-M）表型差异仅CD38表达不同而与间质干细胞（MSC）或树突状细胞（DC）表型明显不同。 结论： 从PBC培养的F-L细胞为巨噬细胞，不是MSC或DC；G-CSF、IL-3能提高F-L细胞培养数量，不改变PB-M向巨噬细胞分化的分化方向。     

Human natural killer cells suppress the proliferation of B cells

We have investigated the suppressive effect of human natural killer (NK) cells on autologous B-cell proliferation. Removal of NK cells by anti-NK-cell monoclonal antibodies (CD16, Leu 11b; Leu 7) increased by 2-3-fold the proliferative response of purified B cells activated by anti-mu and B-cell growth factor (BCGF). The inhibitory effect of NK cells was observed using recombinant IL-2 or semi-purified BCGF-I as sources of BCGF. Moreover NK cells, highly purified by centrifugation on a Percoll discontinuous density gradient, suppressed the proliferative response of purified autologous B cells activated by anti-mu and BCGF. These results show a suppressive effect of human NK cells on B-cell proliferation in vitro.     

Human plasmacytoid-derived dendritic cells and the induction of T-regulatory cells

Suppression by T-regulatory (Tr) cells is essential for the induction of T-cell tolerance and the prevention of autoimmune diseases, organ rejection, and graft-versus-host disease. Increasing attention has been devoted to understand the role of dendritic cells (DC) in the control of Tr-cell differentiation. Here we review the recent evidence that cluster designation (CD)40-ligand activated plasmacytoid-derived DCs (DC2) have the ability to induce primary Tr-cell differentiation. We propose that in addition to the regulatory functions of immature myeloid DC, Tr-cell induction by DC2 represents a nonredundant mechanism for the safeguard of peripheral T-cell tolerance. DC2 can be used as tool to drive potent antigen specific Tr-cell differentiation and expansion in vitro and in vivo.     

TCRγδ cells: Mysterious cells of the immune system

γδ cells participate in pathogenic infections and autoimmune conditions, yet, almost a decade after their discovery, little is known regarding their TCR repertoire or effector functions. Unlike MHC-restricted antigen recognition employed by TCRαβ cells, TCRγδ cells can recognize whole unprocessed antigens in an MHC-independent manner. The nature of positive and negative selection used to shape the repertoire of TCRγδ cells is unclear, especially in the nonlymphoid tissues where these cells predominate. While TCRγδ cells express an activated phenotype and are present in pathological conditions, their roles in immunological protection is unknown. This review will focus on our efforts to study these issues of TCRγδ biology.