简介：目的：检测Semaphorin（Sema）3A及其受体Neuropilin1（NRP1）在舌癌组织和舌鳞状细胞癌SCC9细胞株中的表达情况,同时观察外源性Sema3A蛋白对舌鳞状细胞癌SCC9细胞株的影响。方法：通过细胞免疫化学、RT-PCR和Westernblot-ting方法检测Sema3A、NRP1在舌癌组织和SCC9细胞株中的表达情况;通过MTT实验检测外源性Sema3A蛋白对SCC9细胞株增殖的影响;通过Transwell检测外源性Sema3A蛋白对SCC9细胞株迁移、侵袭的影响。结果：Sema3A在舌癌组织和SCC9细胞株中阴性表达,NRP1在舌癌组织和SCC9细胞株中阳性表达;100ng/ml外源性Sema3A蛋白明显抑制SCC9细胞株的增殖（P〈0.05）,对其迁移、侵袭能力影响未见统计学差异（P〉0.05）。结论：舌癌组织和舌鳞状细胞癌SCC9细胞株中Sema3A的阴性表达、NRP1的阳性表达可能与舌癌的发生发展有关。

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简介：Inthepost-genomicera,variouscomputationalmethodsthatpredictprotein-proteininteractionsatthegenomelevelareavailable;however,eachmethodhasitsownadvantagesanddisadvantages,resultinginfalsepredictions.Herewedevel-opedauniqueintegratedapproachtoidentifyinteractingpartner(s)ofSemaphorin5A(SEMA5A),beginningwithsevenproteinssharingsimilarligandinteractingresiduesasputativebindingpartners.ThemethodsincludeDwyerandRoot-Bernstein/Dillontheoriesofproteinevolution,hydropathiccomplementarityofproteinstructure,patternofproteinfunctionsamongmolecules,informationondomain-domaininteractions,co-expressionofgenesandproteinevolution.AmongthesetofsevenproteinsselectedasputativeSEMA5Ainteractingpartners,wefoundthefunctionsofPlexinB3andNeuropilin-2tobeassociatedwithSEMA5A.WemodeledthesemaphorindomainstructureofPlexinB3andfoundthatitsharessimilaritywithSEMA5A.Moreover,avirtualexpressiondatabasesearchandRT-PCRanalysisshowedco-expressionofSEMA5AandPlexinB3andtheseproteinswerefoundtohaveco-evolved.Inaddition,weconfirmedtheinterac-tionofSEMA5AwithPlexinB3inco-immunoprecipitationstudies.Overall,thesestudiesdemonstratethatanintegratedmethodofpredictioncanbeusedatthegenomelevelfordiscoveringmanyunknownproteinbindingpartnerswithknownligandbindingdomains.

简介：目的：观察Semaphorin3A（SEMA3A）及其受体Neuropilin-1（Nrp-1）在舌癌组织及舌癌细胞系Tca8113中的表达,探讨其对舌癌中血管生成的意义。方法：应用免疫组织化学方法检测舌癌组织和癌旁组织中SEMA3A及Nrp-1的表达,应用免疫细胞化学检测SEMA3A及Nrp-1在Tca8113中的表达,并用Western印迹检测舌癌组织、癌旁组织及舌癌细胞系Tca8113中SEMA3A及其受体Nrp-1的表达情况。采用SPSS11.0软件包对数据进行χ2检验。结果：免疫组织化学显示,17/20例舌癌组织SEMA3A呈阴性表达,18例Nrp-1呈阳性表达。19/20例癌旁组织中SEMA3A阳性表达,而Nrp-1均呈阴性表达。免疫细胞化学显示,SEMA3A在舌癌细胞中检测不到,而Nrp-1均呈阳性表达。Western印迹检测与此结果完全相符。SEMA3A及Nrp-1在舌癌及癌旁组织中的表达有显著差异（P〈0.001）。结论：SEMA3A及其受体Nrp-1在舌癌组织及细胞系中表达异常,提示其可能与肿瘤血管生成相关。

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简介：AbstractBackground:Mesenchymal stem or stromal cells (MSCs) derived from the induced pluripotent stem cells (iPSCs) have uniform biological activity, which makes the clinical application of MSCs in bone repair possible. Culturing the iPSC-MSCs onto osteoconductive materials is a promising tissue engineering-based strategy in bone regeneration. The aim of this work was to evaluate the effects of semaphorin 3A (Sema3A) and hypoxia inducible factor 1 subunit alpha (HIF1α) co-overexpression on the survival and osteogenic differentiation of iPSC-MSCs.Methods:Sema3A and HIF1α were linked together with the three (GGGGS; G, glycine; S, serine) peptide fragment, and their co-expression in iPSC-MSCs was mediated by a lentiviral vector. The fusion protein retained the immune reactivity for both Sema3A and HIF1α as determined with Western blotting. iPSC-MSCs were infected with overexpression lentivirus (oeLenti) as negative control, oeLenti-Sema3A, oeLenti-HIF1α or oeLenti-Sema3A-HIF1α lentiviruses.Results:Sema3A overexpression alone promoted the osteogenic differentiation of iPSC-MSCs (the activity and/or expression of osteoblast markers, such as alkaline phosphatase, osteopontin, and osteocalcin, were upregulated), and suppressed cell survival. The Sema3A-HIF1α fusion protein showed a comparable osteoconductive effect to that of Sema3A without reducing cell survival. We further seeded iPSC-MSCs modified by SemaA-HIF1α overexpression onto hydroxyapatite (HA) scaffolds, and evaluated their growth and differentiation on this three-dimensional material. Additional data indicated that, as compared to iPSC-MSCs cultured in ordinary two-dimensional dishes, cells cultured in HA scaffolds grew (blank vs. HA scaffolds: 0.83 vs. 1.39 for survival) and differentiated better (blank vs. HA scaffolds: 11.29 vs. 16.62 for alkaline phosphatase activity).Conclusion:Modifying iPSC-MSCs with pro-osteogenic (Sema3A) and pro-survival (HIF1α) factors may represent a promising strategy to optimize tissue engineering-based strategy in bone repair.

简介：目的：构建人舌鳞状细胞癌／大鼠背根神经节（dorsalrootganglion，DRG）体外共培养的实验模型，研究神经轴突导向因子Semaphorin3A（Sema3A）及其受体Neuropilin-1（NRP-1）在肿瘤排斥神经的现象中可能发挥的作用。方法：鉴定Sema3A在人舌鳞状细胞癌细胞系SCC25中的表达以及NRP-1在大鼠DRG神经元中的表达，建立人舌鳞状细胞癌／大鼠DRG体外共培养的实验模型，针对NRP-1靶点进行特异性拮抗，观察SCC25排斥DRG轴突生长的程度变化。结果：免疫荧光结果显示，Sema3A在SCC25中表达，而NRP-1在大鼠DRG神经元中也呈阳性表达；共培养实验结果表明，DRG组织块中NRP-1被特异性拮抗后，SCC25对DRG轴突的排斥程度较对照组明显减弱。结论：Sema3A及其受体NRP-1在SCC25排斥大鼠DRG轴突生长过程中起着重要作用。