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1.
Eur Arch Otorhinolaryngol ; 281(1): 419-425, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37673830

RESUMO

OBJECTIVE: The ultrasonic diagnosis of cervical and facial cystic masses, as well as cases of missed diagnosis and misdiagnosis, was examined, to improve the diagnosis of branchial cleft anomalies. METHODS: A retrospective analysis was conducted on 17 patients with branchial cleft cyst anomalies, including 11 males and 6 females, aged 12-53 years, with an average age of 33 ± 2 years, were unilateral single. All patients who underwent an ultrasound examination and image storage for retrospective analysis, and both longitudinal and transverse sections were scanned to observe the shape, size, boundary, peripheral relationship, and blood flow signal of the masses. All cases were examined with an enhanced CT scan, and pathological reports were generated. RESULTS: Among the 17 cases of branchial cleft anomalies, 15 cases were branchial cleft cysts, while one case involved fistula formation and one case involved sinus tract formation. Based on the type of branchial cleft, the first, second, and third cysts were classified in 4, 12, and 1 case, respectively. The sensitivity rate and specificity of ultrasonic diagnosis were 14/17 (82.4%) and 4/6 (66.7%), respectively. Ultrasonic characteristic analysis for the masses can be found in simple cystic masses or hypoechoic masses, most of them are of a regular shape and have a distinct boundary, and almost no blood flow signal. All patients who were misdiagnosed exhibited blood flow signals, including 1 patient with an abundant blood flow signal, 1 patient suspected of having ectopic thyroid with an abnormal function due to the rat-tail sign, 2 patients misdiagnosed as local inflammatory focus, and 1 patient misdiagnosed with tuberculous lymphadenitis. CONCLUSION: Ultrasound has a detection rate of up to 100% for cervical and facial masses, providing a fundamental determination of lesion characteristics and specific guidance for preoperative diagnosis. If the blood flow signals can be identified and carefully considered their peripheral relationship, the diagnostic rate can be improved.


Assuntos
Branquioma , Fístula , Neoplasias de Cabeça e Pescoço , Masculino , Feminino , Humanos , Animais , Ratos , Adulto , Branquioma/diagnóstico por imagem , Branquioma/cirurgia , Estudos Retrospectivos , Região Branquial/diagnóstico por imagem , Região Branquial/cirurgia , Região Branquial/anormalidades , Neoplasias de Cabeça e Pescoço/diagnóstico por imagem , Neoplasias de Cabeça e Pescoço/cirurgia , Fístula/cirurgia , Ultrassonografia
2.
Inorg Chem ; 62(37): 15300-15309, 2023 Sep 18.
Artigo em Inglês | MEDLINE | ID: mdl-37676490

RESUMO

Polyanionic Na2FePO4F is one of the most important cathode materials for sodium-ion batteries. The orthorhombic ß-Na2FePO4F material has been studied extensively and intensively since it was proposed. In this article, a novel monoclinic sodium phosphate fluoride α-Na2FePO4F is concerned. Kirsanova's experiment showed that Na and Fe ions in α-Na2FePO4F are prone to antisite, leading to strong antisite disorder. Through first-principle calculations, we show that the steric effect, the magnetic exchange and superexchange interactions between transition-metal cations are shown to be the main driving forces for Na+/Fe2+ antisite disorder. We first calculated the crystal structures, electronic properties, and cohesive energies of all the 10 antisite phases of α-Na2FePO4F and ß-Na2FePO4F. Then, we compared the difference charge densities, magnetism, binding energies, and electrostatic potentials of α-Na2FePO4F and ß-Na2FePO4F materials in the antisite and pristine phases. In α-Na2FePO4F, the binding energy of the antisite phase with the lowest binding energy is almost degenerate with that of the pristine phase. Moreover, only small differences of the electrostatic potential and the charge density distribution are found between the antisite (with lowest energy) and the pristine phases of α-Na2FePO4F, which also helped elaborate the facile formation of Na+/Fe2+ antisite in the α-Na2FePO4F material. Our research contributes to the understanding of the mechanism of Na+/Fe2+ antisite and the development of high-performance polyanionic cathode materials.

3.
J Cell Physiol ; 237(3): 1845-1856, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-34881818

RESUMO

Abdominal irradiation (IR) may destroy the intestinal mucosal barrier, leading to severe intestinal infection and multiple organ dysfunction syndromes. The role of intestinal microbiota in the development of IR-induced intestinal injury remains largely unknown. Herein, we reported that abdominal IR altered the composition of the microbiota and reduced the abundance and diversity of the gut microbiome. Alterations of bacteria, in particular reduction of Lactobacillus, played a critical role in IR-induced intestinal injury. Fecal microbiota transplant (FMT) from normal mice or administration of Lactobacillus plantarum to intestinal microbiota-eliminated mice substantially reduced IR-induced intestinal damage and prevented mice from IR-induced death. We further characterized that L. plantarum activated the farnesoid X receptor (FXR) - fibroblast growth factor 15 (FGF15) signaling in intestinal epithelial cells and hence promoted DNA-damage repair. Application of GW4064, an activator of FXR, to microbiota eliminated mice markedly mitigated IR-induced intestinal damage, reduced intestinal epithelial cell death and promoted the survival of IR mice. In contrast, suppression of FXR with Gly-ß-MCA, a bile acid and an intestine-selective and high-affinity FXR inhibitor, abrogated L. Plantarum-mediated protection on the ileum of IR mice. Taken together, our findings not only provide new insights into the role of intestinal flora in radiation-induced intestinal injury but also shed new light on the application of probiotics for the protection of radiation-damaged individuals.


Assuntos
Microbioma Gastrointestinal , Lactobacillus plantarum , Animais , Ácidos e Sais Biliares , Microbioma Gastrointestinal/fisiologia , Mucosa Intestinal/metabolismo , Intestinos , Camundongos , Camundongos Endogâmicos C57BL
4.
Yi Chuan ; 44(6): 466-477, 2022 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-35729095

RESUMO

Cells of the aerobic metabolic organism are inevitably subjected to the damage from reactive oxygen species (ROS). ROS cause multiple forms of DNA damage, among which the oxidation product of guanine G 8-hydroxyguanine (8-oxoG) is the most frequent DNA oxidative damage, recognized by the specific glycosidase OGG1 that initiates the base excision repair pathway. If left unrepaired, 8-oxoG may pair with A instead of C, leading to a mutation of G: C to T: A during replication. Thus, the accumulation of 8-oxoG or the abnormal OGG1 repair is thought to affect gene function, which in turn leads to the development of tumor or aging-related diseases. However, a series of recent studies have shown that 8-oxoG tends to be produced in regulatory regions of the genome. 8-oxoG can be regarded as an epigenetic modification, while OGG1 is a specific reader of this information. Substrate recognition, binding or resection by OGG1 can cause DNA conformation changes or affect histone modifications, causing up-regulation or down-regulation of genes with different properties. Thus, in addition to the potential genotoxicity, the association of guanine oxidative damage with development of tumors is closely related to its aberrant initiation of gene expression through epigenetic mechanisms. In this review, we summarize the underlying mechanism of 8-oxoG and repair enzyme OGG1 in tumor development and progression, with aims to interpret the relationship between DNA oxidative damage and tumor from a new perspective, and provide new ideas and targets for tumor treatment.


Assuntos
DNA Glicosilases , Neoplasias , DNA , Dano ao DNA , DNA Glicosilases/genética , DNA Glicosilases/metabolismo , Reparo do DNA , Guanina/análogos & derivados , Guanina/metabolismo , Humanos , Neoplasias/genética , Estresse Oxidativo , Espécies Reativas de Oxigênio/metabolismo
5.
Am J Physiol Renal Physiol ; 317(7): F12-F22, 2019 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-31042059

RESUMO

Metabolic syndrome (MetS) is associated with nutrient surplus and kidney hyperfiltration, accelerating chronic renal failure. The potential involvement of podocyte damage in early MetS remains unclear. Mitochondrial dysfunction is an important determinant of renal damage, but whether it contributes to MetS-related podocyte injury remains unknown. Domestic pigs were studied after 16 wk of diet-induced MetS, MetS treated with the mitochondria-targeted peptide elamipretide (ELAM; 0.1 mg·kg-1·day-1 sc) for the last month of diet, and lean controls (n = 6 pigs/group). Glomerular filtration rate (GFR) and renal blood flow (RBF) were measured using multidetector computed tomography, and podocyte and mitochondrial injury were measured by light and electron microscopy. Urinary levels of podocyte-derived extracellular vesicles (pEVs; nephrin positive/podocalyxin positive) were characterized by flow cytometry. Body weight, blood pressure, RBF, and GFR were elevated in MetS. Glomerular size and glomerular injury score were also elevated in MetS and decreased after ELAM treatment. Evidence of podocyte injury, impaired podocyte mitochondria, and foot process width were all increased in MetS but restored with ELAM. The urinary concentration of pEVs was elevated in MetS pigs and directly correlated with renal dysfunction, glomerular injury, and fibrosis and inversely correlated with glomerular nephrin expression. Additionally, pEV numbers were elevated in the urine of obese compared with lean human patients. Early MetS induces podocyte injury and mitochondrial damage, which can be blunted by mitoprotection. Urinary pEVs reflecting podocyte injury might represent early markers of MetS-related kidney disease and a novel therapeutic target.


Assuntos
Vesículas Extracelulares/ultraestrutura , Síndrome Metabólica/patologia , Mitocôndrias/fisiologia , Podócitos/ultraestrutura , Animais , Dieta , Dieta Hiperlipídica , Feminino , Frutose/administração & dosagem , Taxa de Filtração Glomerular , Humanos , Rim/irrigação sanguínea , Rim/patologia , Rim/fisiopatologia , Glomérulos Renais/efeitos dos fármacos , Glomérulos Renais/patologia , Síndrome Metabólica/tratamento farmacológico , Síndrome Metabólica/etiologia , Mitocôndrias/ultraestrutura , Obesidade/urina , Oligopeptídeos/uso terapêutico , Podócitos/efeitos dos fármacos , Circulação Renal , Sus scrofa , Urina
6.
J Chem Inf Model ; 58(8): 1662-1668, 2018 08 27.
Artigo em Inglês | MEDLINE | ID: mdl-30044626

RESUMO

Molecular docking, which mainly includes pose prediction and binding affinity calculation, has become an important tool for assisting structure-based drug design. Correctly predicting the ligand binding pose to a protein target enables the estimation of binding free energy using various tools. Previous studies have shown that the consensus method can be used to improve the docking performance with respect to compound scoring and pose prediction. In this report, a novel consensus docking strategy was proposed, which uses a dynamic benchmark data set selection to determine the best program combinations to improve the docking success rate. Using the complexes from PDBbind as a benchmark data set, a 4.9% enhancement in success rate was achieved compared with the best program.


Assuntos
Simulação de Acoplamento Molecular , Proteínas/metabolismo , Software , Animais , Bases de Dados de Proteínas , Humanos , Ligantes , Ligação Proteica , Proteínas/química
7.
J Asian Nat Prod Res ; 19(2): 188-193, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28252343

RESUMO

Phytochemistry investigation on Pteris ensiformis led to the isolation of a new ent-kaurane diterpenoid, ent-kaurane-6ß,16α-diol-3-one (1), along with five known diterpenoids (2-6) and three known sesquiterpenes (7-9). Their structures were established by means of spectroscopic methods. The ethanol extract and the isolated compounds (1-9) were evaluated for their antitumor activity against three cancer cell lines.


Assuntos
Antineoplásicos Fitogênicos/isolamento & purificação , Antineoplásicos Fitogênicos/farmacologia , Diterpenos do Tipo Caurano/isolamento & purificação , Diterpenos do Tipo Caurano/farmacologia , Pteris/química , Antineoplásicos Fitogênicos/química , Diterpenos/química , Diterpenos/isolamento & purificação , Diterpenos/farmacologia , Diterpenos do Tipo Caurano/química , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular
8.
Molecules ; 22(7)2017 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-28753960

RESUMO

A new triterpene glycoside ilexdunnoside A (1) and a new sulfated triterpene derivative ilexdunnoside B (2), together with five known analogues 3-7 were isolated from the roots of Ilex dunniana Levl. The structures were established by NMR spectroscopic analysis and acid hydrolysis. Results of an in vivo study of the biological activity showed that 75% ethanol and n-butanol extracts of the plant displayed anti-inflammatory activities against ear edema in mice, with inhibition rates of 23.5% and 37.5%, respectively, at a dose of 50 mg/kg. Furthermore, Compounds 1, 2 and 3 exhibited moderate indirect inhibitory effects on lipopolysaccharide-induced NO production in BV2 microglial cells in vitro, with IC50 values of 11.60, 12.30 and 9.70 µM, respectively.


Assuntos
Anti-Inflamatórios/farmacologia , Glicosídeos/farmacologia , Ilex/química , Inflamação/tratamento farmacológico , Raízes de Plantas/química , Triterpenos/farmacologia , Animais , Anti-Inflamatórios/química , Linhagem Celular , Edema/tratamento farmacológico , Glicosídeos/química , Camundongos , Triterpenos/química
9.
Phys Chem Chem Phys ; 18(4): 3080-5, 2016 Jan 28.
Artigo em Inglês | MEDLINE | ID: mdl-26742089

RESUMO

Using first-principles calculations, we investigate the strain effects on the charge density wave states of monolayer and bilayer 1T-TaS2. The modified stability of the charge density wave in the monolayer is understood in terms of the strain dependent electron localization, which determines the distortion amplitude. On the other hand, in the bilayer, the effect of strain on the interlayer interaction is also crucial. The rich phase diagram under strain opens new venues for applications of 1T-TaS2. We interpret the experimentally observed insulating state of bulk 1T-TaS2 as inherited from the monolayer by effective interlayer decoupling.

10.
Luminescence ; 30(4): 382-7, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25044504

RESUMO

Procaterol hydrochloride (Prh) can inhibit KClO3 oxidation of fluorescein isothiocyanate (FITC) to form a non-phosphorescent compound, which causes room temperature phosphorescence (RTP) of FITC in the system to enhance sharply the linear relationship between ∆Ip and the Prh content. Thus, a rapid response and highly sensitive phosphorescence sensor for the determination of Prh has been developed based on the inhibiting effect of Prh on KClO3 oxidation of FITC. This simple, high sensitivity (detection limit (LD) calculated by 3Sb /k was 0.019 fg/spot, sample volume 0.40 µl, corresponding concentration 4.8 × 10(-14) g ml(-1) ) and selective sensor with a wide linear range (0.080-11.20 g/spot) has been applied to detect Prh in blood samples, and the results were consistent with those obtained by high-performance liquid chromatography (HPLC). Simultaneously, the mechanism of the phosphorescence sensor for the detection of Prh was also investigated using infrared spectroscopy.


Assuntos
Fluoresceína-5-Isotiocianato/química , Medições Luminescentes/métodos , Procaterol/análise , Procaterol/farmacologia , Animais , Cloratos/química , Cromatografia Líquida de Alta Pressão , Corantes Fluorescentes/química , Humanos , Limite de Detecção , Oxirredução , Procaterol/sangue , Procaterol/urina , Sensibilidade e Especificidade , Espectrofotometria Infravermelho , Sus scrofa
11.
World J Microbiol Biotechnol ; 31(6): 921-7, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25850532

RESUMO

The engineered Escherichia coli 78-7 is a derivative of E. coli JM109 carrying a nitrogen fixation (nif) gene cluster composed of nine genes (nifB, nifH, nifD, nifK, nifE, nifN, nifX, hesA and nifV) and its own σ(70)-dependent nif promoter from a gram-positive bacterium Paenibacillus sp. WLY78. The physiological and biochemical characteristics of the engineered E. coli 78-7 were analyzed by using Biolog GEN III MicroPlate, with E. coli JM109 and JM109/pHY300PLK (E. coli JM109 carrying empty vector) as controls. Analysis of 94 phenotypic tests: 71 carbon source utilization assays and 23 chemical sensitivity tests showed that the engineered E. coli 78-7, E. coli JM109 and JM109/pHY300PLK gave similar patterns of utilization of various substrates as carbon and energy sources. Furthermore, the effect of carbon source, nitrogen source, culture temperature on the nitrogenase activity of the engineered E. coli 78-7 was investigated. Our study demonstrates that the nif capacity of E. coli 78-7 was affected significantly by the different culture condition. The significant nitrogenase activity of E. coli 78-7 were obtained when cells were cultivated in the medium containing 4 g/l glucose (carbon source) and 2 mM glutamate (nitrogen source) and at 30 °C.


Assuntos
Escherichia coli/enzimologia , Engenharia Metabólica , Nitrogenase/metabolismo , Carbono/metabolismo , Clonagem Molecular , Meios de Cultura/química , Metabolismo Energético , Escherichia coli/genética , Escherichia coli/crescimento & desenvolvimento , Família Multigênica , Nitrogênio/metabolismo , Nitrogenase/genética , Paenibacillus/enzimologia , Paenibacillus/genética , Temperatura
12.
Zhongguo Zhong Yao Za Zhi ; 40(14): 2876-81, 2015 Jul.
Artigo em Zh | MEDLINE | ID: mdl-26666043

RESUMO

To investigate the absorption kinetics of Cu B-SDC/PLC-MMs in rat different intestinal segments and compared with the absorption of Cu B suspension. The in vitro everted gut sacs model was established to study the absorption characteristics of Cu B-SDC/ PLC-MMs in rat duodenum, jejunum, ileum and colon, and the content of cucurbitacin B was detected by HPLC method, and the effects of concentrations on intestinal absorption were evaluated as well. The results showed that the absorption of Cu B-SDC/PLC-MMs was linearity at different intestine segment and different concentrations (R2 > 0.9), which was consistent with zero order rate process. The Ka of different intestine segments showed a concentration-dependent increasing along with the raised concentration of Cu B-SDC/ PLC-MMs, indicating that it was likely to be a mechanism of passive absorption. The best absorption site of Cu B-SDC/PLC-MMs was ileum, and its absorptions in different intestinal segments were superior to cucurbitacin B suspension. SDC/PLC-MMs could significantly enhance the intestinal absorption of cucurbitacin B, and the study of intestinal absorption kinetics of Cu B-SDC/PLC-MMs had gave a support to its further reasonable solidfication.


Assuntos
Ácido Desoxicólico/administração & dosagem , Absorção Intestinal , Fosfolipídeos/administração & dosagem , Triterpenos/farmacocinética , Animais , Feminino , Cinética , Masculino , Micelas , Nanopartículas , Ratos , Ratos Wistar , Triterpenos/administração & dosagem
13.
Zhongguo Zhong Yao Za Zhi ; 40(7): 1381-7, 2015 Apr.
Artigo em Zh | MEDLINE | ID: mdl-26281565

RESUMO

Danggui, Agelicae Sinensis Radix, is a widely used Chinese herb to enrich blood, but its quality cannot be effectively assessed by the known chemical markers such as ferulic acid, ligustilide, polysaccharides, etc. A new bioassay was therefore developed to quantify the Enrich-Blood Bioactivity (EBB) for the quality assessment of Danggui raw materials. Danggui sample was first extracted with ethanol and water, respectively. Then the ethanolic extract and water extract were mixed as a test sample to quantify the amount of EBB by mice experiment. The blood deficiency mode in mice was developed by intraperitoneal injecting cyclophospharmide and phenylhdrazine hydrochloride. The quantity of red blood cell was chosen as EBB marker. Cyclosporine A was chosen as a control substance. EBB in analytes was quantified by the amount reaction of parallel line analysis (3, 3') method. The results indicated that the reliability test for quantifying EBB was passed through and the measured value was valid. The analytes showed the significant EBB (P < 0.05). The correlation coefficient was 0.9984 (n=5) between the amount of cyclosporine A (0.035-0.56 g x kg(-1)) and the increased number of red blood cell. The relative standard deviation (RSY) on the amount of EBB was estimated to be 6.15% (n = 6) by six replicated tests, and the confidence limit rate was 26.68% (n = 6). Five Danggui samples, which were collected from different cultivation areas with various morphological characters, showed the variety of EBB in the range of 21.95-44.16 U x g(-1). It is concluded that the developed method is accurate to quantify the EBB of Danggui raw materials, and is therefore suitable to assess its quality.


Assuntos
Angelica sinensis/química , Bioensaio/métodos , Medicamentos de Ervas Chinesas/farmacologia , Eritrócitos/efeitos dos fármacos , Animais , Contagem de Eritrócitos , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Raízes de Plantas/química
14.
J Fluoresc ; 24(6): 1775-83, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25294182

RESUMO

Fluorescein (HFin) could emit strong and stable room temperature phosphorescence (RTP) signal on polyamide membrane (PAM) using Pb(2+) as the ion perturber. Carbaryl could activate effect on NaIO4 oxidating HFin, which caused the RTP signal of the system to quench sharply. The phosphorescence intensity (ΔI p) of activating system higher 3.3 times (119.4/36.0) than that of non-activating system, and is directly proportional to the content of carbaryl. Thus, an activating solid substrate room temperature phosphorimetry (SSRTP) for carbaryl detection has been established. This sensitive (the limit of quantification (LOQ) was 2.0 × 10(-13) g mL(-1)), selective, simple and rapid method has been applied to determine trace carbaryl in water samples with the results consisting with those obtained by fluorimetry, showing its high accuracy. The apparent activation energy (E) and rate constant (k) of this activating reaction were 20.77 kJ mol(-1) and 1.85 × 10(-4) s(-1), respectively. Meanwhile, the mechanism of activating SSRTP for carbaryl detection was also discussed using infrared spectra (IR).

15.
Acta Pharmacol Sin ; 35(8): 1023-30, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24998255

RESUMO

AIM: The roles of G-protein coupled receptors (GPCRs) in stem cell biology remain unclear. In this study, we aimed to identify GPCRs that might contribute to the self-renewal of mouse embryonic stem cells (mESCs). METHODS: The expression levels of pluripotent genes and GPCR gene were detected in E14 mESCs using PCR array and RT-PCR. Immunofluorescent staining was used to examine the expression of pluripotent markers and the receptor translocation. Western blot analysis was used to detect phosphorylation of signal proteins. Knock-down of receptor was conducted to confirm its role in pluripotency maintenance. RESULTS: In leukemia inhibitory factor (LIF)-free medium, mESCs lost the typical morphology of pluripotency, accompanied by markedly decreases in expression of somatostatin receptor type 2 (SSTR2), as well as the pluripotency biomarkers Oct4, Sox2, Rex1 and Nanog. Addition of the SSTR2 agonist octreotide or seglitide (0.1-30 µmol/L) in LIF-free medium dose-dependently promoted the self-renewal of mESCs, whereas the SSTR2 antagonist S4 (0.03-3 µmol/L) dose-dependently blocked octreotide-induced self-renewal. Knock-down of SSTR2 significantly decreased the self-renewal of mESCs even in the presence of LIF. Addition of LIF (1000 U/mL) or octreotide (1 µmol/L) in LIF-free medium significantly increased both phosphorylation and nuclear ocalization of STAT3. CONCLUSION: The activation of SSTR2 contributes to the self-renewal of mESCs via activation of the STAT3 pathway.


Assuntos
Células-Tronco Embrionárias/citologia , Receptores de Somatostatina/genética , Animais , Diferenciação Celular , Linhagem Celular , Proliferação de Células , Células-Tronco Embrionárias/metabolismo , Regulação da Expressão Gênica no Desenvolvimento , Técnicas de Silenciamento de Genes , Fator Inibidor de Leucemia/metabolismo , Camundongos , Receptores de Somatostatina/metabolismo , Fator de Transcrição STAT3/metabolismo , Transdução de Sinais
16.
Exp Mol Pathol ; 95(3): 350-56, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24422232

RESUMO

OBJECTIVE: Cancer-associated fibroblasts (CAFs) are one of the most important components of tumor microenvironment. CAFs are believed to play an important role in tumor invasion and metastasis. Recently, fibroblast activation protein (FAP), a type II integral membrane glycoprotein belonging to the serine protease family, has emerged as a specific marker of CAFs. FAP was overexpressed in stromal fibroblasts of solid malignancies, however, the role of FAP on the process of invasion and metastasis of gastric carcinomas is still unknown. METHODS: Expression of FAP level was detected by immunohistochemistry in 60 gastric cancer surgical specimens (28 with omentum metastasis and 32 without), 20 normal human gastric tissues and omentum of 10 nonneoplastic gastric diseases. Fibroblasts were isolated from patient's tissues in the distal normal zones and tumor zones respectively, which were correspondingly designated as normal zone fibroblasts (NFs) and cancer-associated fibroblasts (CAFs). To explore the effects of FAP on NFs or CAFs, fibroblasts were co-cultured with human gastric cancer cell line MGC-803 cells. The ability of invasion and migration of MGC-803 cells was evaluated after transfecting FAP siRNA into CAFs of gastric carcinomas. RESULTS: We investigated the level of expression of FAP in surgical specimens, and found overexpressed in CAFs and non-expressed in NFs. Expression of FAP level in CAFs is significantly associated with Lauren classification,the degree of differentiation, depth of tumor invasion and TNM stage, but it is not correlated to age and gender in gastric carcinoma patients. There was positive correlation between the FAP level with metastasis to the omentum(p < 0.05, R(2) = 0.2736, p < 0.05, R(2) = 0.1479). In addition, the invasion and migration abilities of MGC-803 cells were significantly increased when cells were co-cultured with CAFs. On the other hand, invasion and migration abilities were significantly decreased by 46.9 and 50.3%, respectively, after knocking down FAP in CAFs.Further, NFs did not have appreciable effect on the invasion and migration of MGC-803 cells. CONCLUSIONS: Our findings showed that FAP was overexpressed in CAFs of gastric carcinomas, and siRNA-mediated knock down of FAP significantly suppressed invasion and migration of MGC-803 cells. FAP may be an important regulator in the invasion and migration of gastric cancer and may provide a novel therapeutic target in gastric carcinomas.


Assuntos
Movimento Celular , Fibroblastos/patologia , Gelatinases/metabolismo , Proteínas de Membrana/metabolismo , Omento/patologia , Serina Endopeptidases/metabolismo , Neoplasias Gástricas/patologia , Estômago/patologia , Western Blotting , Adesão Celular , Proliferação de Células , Células Cultivadas , Endopeptidases , Feminino , Fibroblastos/metabolismo , Mucosa Gástrica/metabolismo , Gelatinases/antagonistas & inibidores , Gelatinases/genética , Humanos , Técnicas Imunoenzimáticas , Metástase Linfática , Masculino , Proteínas de Membrana/antagonistas & inibidores , Proteínas de Membrana/genética , Pessoa de Meia-Idade , Invasividade Neoplásica , Estadiamento de Neoplasias , Omento/metabolismo , RNA Interferente Pequeno/genética , Serina Endopeptidases/genética , Neoplasias Gástricas/metabolismo , Células Estromais/metabolismo , Células Estromais/patologia
17.
Analyst ; 138(1): 278-83, 2013 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-23133827

RESUMO

A novel fluorescent probe (Zr(CDs-COO)(2)EDTA) has been designed for fluoride ion (F(-)) content detection based on the competitive ligand reactions carried out between the carboxylate groups (-COOH) on the surface of the luminescent carbon dots (CDs) and F(-) coordinated to Zr(H(2)O)(2)EDTA. The strong and stable fluorescence signal of this probe was quenched upon the addition of F(-) as a result of the formation of the non-fluorescent complex Zr(F)(2)EDTA, due to the stronger affinity of F(-) than the -COOH in the CDs to Zr(IV). The fluorescence change (ΔF) in this process was linear with respect to the content of F(-), ranging from 0.10 µM to 10 µM. The probe has been applied to F(-) detection in toothpaste and water samples with satisfactory results. Moreover, the mechanism of this Zr(H(2)O)(2)EDTA modulated fluorescent probe for the detection of F(-) was also discussed.


Assuntos
Carbono/química , Corantes Fluorescentes/química , Fluoretos/análise , Compostos Organometálicos/química , Zircônio/química , Fluoretos/química , Espectrometria de Fluorescência
18.
Acta Pharmacol Sin ; 34(6): 765-76, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23603980

RESUMO

The revolutionary induced pluripotent stem cell (iPSC) technology provides a new path for cell replacement therapies and drug screening. Patient-specific iPSCs and subsequent differentiated cells manifesting disease phenotypes will finally position human disease pathology at the core of drug discovery. Cells used to test the toxic effects of drugs can also be generated from normal iPSCs and provide a much more accurate and cost-effective system than many animal models. Here, we highlight the recent progress in iPSC-based cell therapy, disease modeling and drug evaluations. In addition, we discuss the use of small molecule drugs to improve the generation of iPSCs and understand the reprogramming mechanism. It is foreseeable that the interplay between iPSC technology and small molecule compounds will push forward the applications of iPSC-based therapy and screening systems in the real world and eventually revolutionize the methods used to treat diseases.


Assuntos
Descoberta de Drogas/métodos , Células-Tronco Pluripotentes Induzidas/metabolismo , Modelos Biológicos , Alternativas aos Testes com Animais/métodos , Animais , Modelos Animais de Doenças , Desenho de Fármacos , Humanos , Células-Tronco Pluripotentes Induzidas/transplante , Bibliotecas de Moléculas Pequenas/farmacologia
19.
Luminescence ; 28(5): 634-40, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23023763

RESUMO

The rhodamine 6G(+) -perphenazine (Rhod 6G(+) -PPH) compound is formed in the ester-exchange reaction between -OH of PPH and -COOC2 H5 of Rhod 6G(+) . PPH was oxidized to a red compound (PPH') in the presence of K2 S2 O8 . Interestingly, the room temperature phosphorescence (RTP) of Rhod 6G(+) was quenched because the -OH of PPH' reacted with -COOC2 H5 of Rhod 6G(+) -PPH to form Rhod 6G(+) -PPH' and PPH, which decreased the π-electron density (δ) of the carbon atom in the Rhod 6G(+) -PPH' conjugated system and enhanced the nonradiation energy loss of the excited Rhod 6G(+) of the triplet state. The PPH content was directly proportional to the ΔIp of the system. Thus, a new catalytic solid-substrate room temperature phosphorimetry (SSRTP) method was established for the determination of PPH. The method had high sensitivity (the limit of detection was 0.019 fg/spot, corresponding to a concentration of 4.8 × 10(-14) g/mL; the sampling quantity was 0.40 µL/spot), good selectivity, convenience and speed. The analytical results were in accordance with those of high-performance liquid chromatography (HPLC). The structures of Rhod 6G(+) , PPH and Rhod 6G(+) -PPH were characterized by infrared spectra. The reaction mechanism by which PPH was determined is discussed.


Assuntos
Medições Luminescentes/métodos , Perfenazina/análise , Rodaminas/química , Temperatura , Catálise , Elétrons , Estrutura Molecular
20.
Yao Xue Xue Bao ; 48(4): 573-9, 2013 Apr.
Artigo em Zh | MEDLINE | ID: mdl-23833948

RESUMO

To obtain the optimal preparation technology of Fang-bing nasal inhalant from components of traditional Chinese medicine by central composite design, with an apparatus containing nasal inhalant that simulated the expiration and inspiration of nose, the dissolution in vitro of different optimized inhalant samples designed through central composite design were investigated. The accumulative release of linalool, borneol, menthol was detected with GC. Response surface methodology was used to optimize the conditions of preparation technology by establishing multiple linear regression and second-order quadratic models. Then, deviation was carried out through comparing the observed and predicted values. It was showed that the coefficient of correlation of second-order quadratic model was high. The related coefficient reached 0.999 3, 0.998 0, 0.944 9, separately. The optimum conditions of preparation technology were as following: 84.39% of alcohol concentration, the weight of starch 1.45 g and the weight of carmellose sodium (CMC-Na for short) 1.22 g. The deviations between observed and predicated values showed -0.36%, 1.52%, 2.40%, separately. In this experiment, the established model can describe the good relation between factors and indexes from preparation technology of Fang-bing nasal inhalant and the outcome of prediction is well. This optimal Fang-bing nasal inhalant was used to study its in vivo effect on model rats deprived from sleep and showed sedative and sleep aiding, which will bring an instruction on inhalants of components from traditional Chinese medicine.


Assuntos
Canfanos/administração & dosagem , Medicamentos de Ervas Chinesas/administração & dosagem , Hipnóticos e Sedativos/administração & dosagem , Mentol/administração & dosagem , Monoterpenos/administração & dosagem , Tecnologia Farmacêutica/métodos , Monoterpenos Acíclicos , Administração por Inalação , Animais , Canfanos/química , Canfanos/farmacologia , Química Farmacêutica/métodos , Cromatografia Gasosa/métodos , Combinação de Medicamentos , Medicamentos de Ervas Chinesas/química , Medicamentos de Ervas Chinesas/farmacologia , Hipnóticos e Sedativos/química , Hipnóticos e Sedativos/farmacologia , Masculino , Mentol/química , Mentol/farmacologia , Monoterpenos/química , Monoterpenos/farmacologia , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Sono/efeitos dos fármacos
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