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1.
Math Biosci Eng ; 16(6): 6923-6933, 2019 07 29.
Artigo em Inglês | MEDLINE | ID: mdl-31698596

RESUMO

Objective: To investigate whether miR-125a-5p can inhibit the proliferation and invasion of breast cancer cells and induce apoptosis by targeting GAB2. Methods: qRT-PCR was used to detect the expression of miR-125a-5p in normal mammary epithelial cells and breast cancer cell lines; The miR-125a-5p overexpression plasmid was transiently transfected into MDA-MB-157 cells, and the proliferation, invasion and apoptosis of breast cancer cells were detected by CCK8 kit, Transwell chamber and flow cytometry, respectively; Gene silencing was used to knock down GAB2 gene in MDA-MB-157 cells, and the changes of proliferation, invasion, apoptosis and apoptosis-related proteins in breast cancer cells were detected by CCK8 kit, Transwell chamber, flow cytometry and western blot, respectively; The direct interaction between miR-125a-5p and GAB2 was detected by dual-luciferase reporter assay. The miR-125a-5p overexpression plasmid was transiently transfected into MDA-MB-157 cells, and the expression levels of GAB2 and apoptosis-related proteins were detected by western blot. Results: The expression of miR-125a-5p in breast cancer cell lines, MDA-MB-157 cells, MDA-MB-361 cells and MDA-MB-415 cells, was significantly lower than that in normal breast epithelial cells, MCF-10A cells; The proliferation and invasion ability of MDA-MB-157 cells transfected with miR-125a-5p were significantly inhibited, and the apoptosis rate was significantly increased; Since GAB2 knocked down, the proliferation and invasion ability of MDA-MB-157 cells were significantly inhibited, while the apoptosis rate was significantly increased, the Bax protein expression was significantly down-regulated, and the Bcl-2 protein expression was significantly up-regulated; The dual-luciferase reporter assay demonstrated that miR-125a-5p can specifically target GAB2. Transfected with miR-125a-5p, the GAB2 protein expression and Bax protein expression were significantly down-regulated, but the Bcl-2 protein expression was significantly up-regulated. Conclusion: miR-125a-5p inhibits the proliferation and invasion of breast cancer cells and induces their apoptosis by negatively regulating GAB2.

2.
Mol Med Rep ; 16(3): 2851-2855, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28656246

RESUMO

Platanus acerifolia (P. acerifolia) is an important cause of pollinosis in cities. The use of allergen extracts on patients with allergic diseases is the most commonly applied method to attempt to treat pollinosis. Pla a 3, a non­specific lipid transfer protein, is a major allergen present in P. acerifolia pollen extracts. In the present study, the Pla a 3 gene was sub­cloned into a pSUMO­Mut vector using Stu I and Xho I sites and transformed into the Arctic Express™ (DE3) RP E. coli host strain. The purified Pla a 3 allergen was analyzed by western blotting and the results revealed that the Pla a 3 allergen has the ability to bind IgE in the P. acerifolia pollen of allergic patients' sera. Moreover, the authors predicted the potential B cell epitopes of the Pla a 3 allergen using the DNAStar Protean system, the Bioinformatics Predicted Antigenic Peptides system and the BepiPred 1.0 server. In addition, the T cell epitopes were predicted by the SYFPEITHI database and the NetMHCII­2.2 server. As a result, two B cell epitopes (35­45 and 81­86) and four potential T cell epitopes including 2­15, 45­50, 55­61 and 67­73 were predicted in the present study. The current results can be used to contribute to allergen immunotherapies and useful in peptide­based vaccine designs of pollen allergy.


Assuntos
Epitopos de Linfócito B/imunologia , Epitopos de Linfócito T/imunologia , Imunoglobulina E/imunologia , Magnoliopsida/imunologia , Rinite Alérgica Sazonal/imunologia , Adolescente , Adulto , Antígenos de Plantas/química , Antígenos de Plantas/genética , Antígenos de Plantas/imunologia , Antígenos de Plantas/isolamento & purificação , Clonagem Molecular , Epitopos de Linfócito B/química , Epitopos de Linfócito B/genética , Epitopos de Linfócito B/isolamento & purificação , Epitopos de Linfócito T/química , Epitopos de Linfócito T/genética , Epitopos de Linfócito T/isolamento & purificação , Escherichia coli/genética , Feminino , Humanos , Imunoglobulina E/sangue , Magnoliopsida/química , Magnoliopsida/genética , Masculino , Pessoa de Meia-Idade , Modelos Moleculares , Pólen/química , Pólen/genética , Pólen/imunologia , Conformação Proteica , Rinite Alérgica Sazonal/sangue , Adulto Jovem
3.
Stem Cell Res Ther ; 4(3): 45, 2013 May 02.
Artigo em Inglês | MEDLINE | ID: mdl-23673003

RESUMO

Acute lung injury (ALI), and its more severe form, acute respiratory distress syndrome (ARDS), are syndromes of acute hypoxemic respiratory failure resulting from a variety of direct and indirect injuries to the gas exchange parenchyma of the lungs. Current treatment of ALI/ARDS is primarily supportive, with lung protective ventilation and fluid conserving strategies. Despite improvement in these strategies, recent data indicate that the mortality of ALI/ARDS is still as high as 30 to 50%. Thus, there is a need for innovative therapies to further improve clinical outcomes of ALI/ARDS. Recent studies involving the administration of mesenchymal stem cells (MSCs) for the treatment of experimental ALI/ARDS have shown promising results. This review focuses on existing studies that have tested the use of MSCs in models of ALI/ARDS, and the potential mechanisms underlying their therapeutic effects.


Assuntos
Lesão Pulmonar Aguda/terapia , Transplante de Células-Tronco Mesenquimais , Síndrome do Desconforto Respiratório do Adulto/terapia , Animais , Humanos , Células-Tronco Mesenquimais/citologia , Comunicação Parácrina
4.
J Spinal Disord Tech ; 24(6): E49-56, 2011 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-21685804

RESUMO

STUDY DESIGN: An in vitro biomechanical cadaver study. OBJECTIVES: To evaluate the pull-out strength after 5000 cyclic loading among 4 revision techniques for the loosened iliac screw using corticocancellous bone, longer screw, traditional cement augmentation, and boring cement augmentation. SUMMARY OF BACKGROUND DATA: Iliac screw loosening is still a clinical problem for lumbo-iliac fusion. Although many revision techniques using corticocancellous bone, larger screw, and polymethylmethacrylate (PMMA) augmentation were applied in repairing pedicle screw loosening, their biomechanical effects on the loosened iliac screw remain undetermined. METHODS: Eight fresh human cadaver pelvises with the bone mineral density values ranging from 0.83 to 0.97 g/cm were adopted in this study. After testing the primary screw of 7.5 mm diameter and 70 mm length, 4 revision techniques were sequentially established and tested on the same pelvis as follows: corticocancellous bone, longer screw with 100 mm length, traditional PMMA augmentation, and boring PMMA augmentation. The difference of the boring technique from traditional PMMA augmentation is that PMMA was injected into the screw tract through 3 boring holes of outer cortical shell without removing the screw. On an MTS machine, after 5000 cyclic compressive loading of -200∼-500 N to the screw head, axial maximum pull-out strengths of the 5 screws were measured and analyzed. RESULTS: The pull-out strengths of the primary screw and 4 revised screws with corticocancellous bone, longer screw and traditional and boring PMMA augmentation were 1167 N, 361 N, 854 N, 1954 N, and 1820 N, respectively. Although longer screw method obtained significantly higher pull-out strength than corticocancellous bone (P<0.05), the revised screws using these 2 techniques exhibited notably lower pull-out strength than the primary screw and 2 PMMA-augmented screws (P<0.05). Either traditional or boring PMMA screw showed obviously higher pull-out strength than the primary screw (P<0.05); however, no significant difference of pull-out strength was detected between the 2 PMMA screws (P>0.05). CONCLUSIONS: Wadding corticocancellous bone and increasing screw length failed to provide sufficient anchoring strength for a loosened iliac screw; however, both traditional and boring PMMA-augmented techniques could effectively increase the fixation strength. On the basis of the viewpoint of minimal invasion, the boring PMMA augmentation may serve as a suitable salvage technique for iliac screw loosening.


Assuntos
Cimentos para Ossos , Parafusos Ósseos , Ílio/cirurgia , Vértebras Lombares/cirurgia , Falha de Prótese , Idoso , Fenômenos Biomecânicos , Feminino , Humanos , Fixadores Internos , Masculino , Pessoa de Meia-Idade , Reoperação
5.
Clin Biomech (Bristol, Avon) ; 26(6): 556-61, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21345556

RESUMO

BACKGROUND: Iliac screw loosening has been a clinical problem in the lumbo-pelvic reconstruction. Although iliac screws are commonly inserted into either upper or lower iliac column, the biomechanical effects of the two fixations and their revision techniques with bone cement remain undetermined. The purpose of this study was to compare the anchoring strengths of the upper and lower iliac screws with and without cement augmentation. METHODS: 5 pairs of formalin fixed cadaveric ilia with the bone mineral density values ranged from 0.82 to 0.97 g/cm(2) were adopted in this study. Using screws with 70-mm length and 7.5-mm diameter, 2 conventional iliac screw fixations and their revision techniques with cement augmentation were sequentially established and tested on the same ilium as follows: upper screw, upper cement screw, lower screw, and lower cement screw. Following 2000 cyclic compressive loading of -300 N to -100 N to the screw on a material testing machine, the maximum pull-out strengths were measured and analyzed. FINDINGS: The average pull-out strengths of upper, upper cement, lower, and lower cement screws were 964 N, 1462 N, 1537 N, and 1964 N, respectively. The lower screw showed significantly higher pull-out strength than the upper one (P=0.008). The cement augmentation notably increased the pull-out strengths of both upper and lower screws. The positive correlation between pull-out strength and bone mineral density value was obtained for the 4 fixations. INTERPRETATION: The lower iliac screw technique should be the preferred choice in lumbo-pelvic stabilization surgery; cement augmentation may serve as a useful salvage technique for iliac screw loosening; preoperative evaluation of bone quality is crucial for predicting fixation strength of iliac screw.


Assuntos
Cimentos para Ossos/química , Parafusos Ósseos , Idoso , Fenômenos Biomecânicos , Densidade Óssea , Feminino , Humanos , Ílio/química , Masculino , Pessoa de Meia-Idade , Ossos Pélvicos/patologia , Pelve/patologia , Estresse Mecânico
6.
Zhonghua Liu Xing Bing Xue Za Zhi ; 29(9): 930-3, 2008 Sep.
Artigo em Chinês | MEDLINE | ID: mdl-19173862

RESUMO

OBJECTIVE: To explore the relationships between the polymorphisms of xeroderma pigmentosum A (XPA) and the susceptibility of esophageal cancer (EC), as well as its interaction with environmental factors-gene in Changzhi area, Shanxi province. METHODS: A case-control study was conducted, including 196 cases of EC and 201 controls. XPA 23G polymorphisms were determined with polymerase chain-restriction on fragment length polymorphism (PCR-RFLP). RESULTS: The risk of EC was significantly degraded in the individuals who had been carrying the XPA heterozygote (A/G) and mutation genotype (G/G), compared to those with wild genotype (chi2 = 16.21, P < 0.01) and the ORs were 0.58 (0.37-0.91) and 0.32 (0.18-0.56), respectively. There was negative interaction between XPA 23G mutation genotype and the consumption of pickled food (S = 0.04, API= -0.77). CONCLUSION: Genetic polymorphism in the XPA 23G might be associated with esophageal cancer in Changzhi area, and there was a negative action between XPA predisposing genotype and the consumption of pickled food.


Assuntos
Neoplasias Esofágicas/genética , Polimorfismo Genético , Proteína de Xeroderma Pigmentoso Grupo A/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos de Casos e Controles , Feminino , Predisposição Genética para Doença , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade
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