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2.
Clin Transl Gastroenterol ; 11(11): e00262, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33259161

RESUMO

OBJECTIVES: To establish and verify a simple noninvasive model based on the left gastric vein (LGV) to predict the grade of esophageal varices (EV) and high-risk EV (HEV), to facilitate clinical follow-up and timely treatment. METHODS: We enrolled 320 patients with B-viral cirrhosis. All patients underwent endoscopy, laboratory tests, liver and spleen stiffness (SS), and ultrasonography. HEV were analyzed using the χ test/t test and logistic regression in the univariate and multivariate analyses, respectively. EV grades were analyzed using the variance/rank-sum test and logistic regression. A prediction model was derived from the multivariate predictors. RESULTS: In the training set, multivariate analysis showed that the independent factors of different EV grades were SS, LGV diameter, and platelet count (PLT). We developed the LGV diameter-SS to PLT ratio index (LSPI) and LGV diameter/PLT models without SS. The area under the receiver operating characteristic curve of the LSPI for diagnosis of small EV, medium EV, large EV, and HEV was 0.897, 0.899, 0.853, and 0.954, respectively, and that of the LGV/PLT was 0.882, 0.890, 0.837, and 0.942, respectively. For the diagnosis of HEV, the negative predictive value was 94.07% when LSPI < 19.8 and the positive predictive value was 91.49% when LSPI > 23.0. The negative predictive value was 95.92% when LGV/PLT < 5.15, and the positive predictive value was 86.27% when LGV/PLT > 7.40. The predicted values showed similar accuracy in the validation set. DISCUSSION: Under appropriate conditions, the LSPI was an accurate method to detect the grade of EV and HEV. Alternatively, the LGV/PLT may also be useful in diagnosing the varices when condition limited.

3.
PLoS One ; 13(2): e0193193, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29466419

RESUMO

Previously, we obtained the sweetpotato somatic hybrid KT1 from a cross between sweetpotato (Ipomoea batatas (L.) Lam.) cv. Kokei No. 14 and its drought-tolerant wild relative I. triloba L. KT1 not only inherited the thick storage root characteristic of Kokei No. 14 but also the drought-tolerance trait of I. triloba L. The aim of this study was to explore the molecular mechanism of the drought tolerance of KT1. Four-week-old in vitro-grown plants of KT1, Kokei No. 14, and I. triloba L. were subjected to a simulated drought stress treatment (30% PEG6000) for 0, 6, 12 and 24 h. Total RNA was extracted from samples at each time point, and then used for transcriptome sequencing. The gene transcript profiles of KT1 and its parents were compared to identify differentially expressed genes, and drought-related modules were screened by a weighted gene co-expression network analysis. The functions of ABI-like protein and Ca2+-ATPase, two proteins screened from the cyan and light yellow modules, were analyzed in terms of their potential roles in drought tolerance in KT1 and its parents. These analyses of the drought responses of KT1 and its somatic donors at the transcriptional level provide new annotations for the molecular mechanism of drought tolerance in the somatic hybrid KT1 and its parents.


Assuntos
ATPases Transportadoras de Cálcio/biossíntese , Quimera/metabolismo , Resistência à Doença , Perfilação da Expressão Gênica , Ipomoea batatas/metabolismo , Pressão Osmótica , Proteínas de Plantas/biossíntese , ATPases Transportadoras de Cálcio/genética , Quimera/genética , Desidratação/genética , Desidratação/metabolismo , Ipomoea batatas/genética , Proteínas de Plantas/genética , Polietilenoglicóis/farmacologia , Transcriptoma/efeitos dos fármacos
4.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi ; 25(3): 571-7, 2008 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-18693433

RESUMO

Under laboratory condition, the compound materials of Poly (DL-lactic-co-glycolic acid)/Tricalcium phosphate [PLGA/TCP(L), with component ratio of 7:3] were fabricated by combining the thermally induced phase separation (TIPS) with solvent-casting particulate-leaching (SCPL) approach. On the other hand, rapid prototyping (RP) technique manufactured PLGA/TCP scaffolds [PLGA/TCP(RP)] were obtained. These two kinds of carriers were coated with collagen type I (Col I). The extracted bovine bone morphogenetic protein (bBMP) was loaded into carriers to establish biomimetic synthetic bones. PLGA/TCP(L) scaffolds, demineralized bone matrices (DBM) of bovine cancellous bone, PLGA/TCP(L) scaffolds, biomimetic synthetic bones and OsteoSet bone graft substitutes were investigated. Scanning electron microscopy revealed that the microarchitecture of PLGA/TCP(RP) scaffolds was much better than that of PLGA/TCP(L) scaffolds. The diameter of macropore of PLGA/TCP(RP) scaffold was 350 microm. The porosities of PLGA/ TCP(L) scaffolds, DBM, PLGA/TCP(RP) scaffolds and OsteoSet bone graft substitutes were 21.5%, 70.4%, 58.6% and 0%, respectively (P<0.01). Modification of PLGA/TCP scaffolds with collagen type I [PLGA/TCP(L)-Col I and PLGA/TCP(RP)-Col I] essentially increased the affinity of the carriers to bBMP. Among these synthetic materials, PLGA/TCP(RP)-Col I-bBMP composite is promising as a novel bone graft substitute due to its advanced fabrication technique, good tri-dimensional microarchitecture and ideal components.


Assuntos
Materiais Biocompatíveis/química , Substitutos Ósseos/química , Fosfatos de Cálcio/química , Ácido Láctico/química , Ácido Poliglicólico/química , Engenharia Tecidual , Proteínas Morfogenéticas Ósseas/química , Humanos , Microscopia Eletrônica de Varredura , Copolímero de Ácido Poliláctico e Ácido Poliglicólico , Porosidade , Propriedades de Superfície , Engenharia Tecidual/métodos
5.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi ; 23(4): 795-9, 2006 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-17002110

RESUMO

Tri-dimensional poly (DL-lactic-co-glycolic acid) (PLGA) scaffolds were fabricated using a rapid prototyping (RP) technique and the gene of human bone morphogenetic protein 2 (hBMP-2) was transferred into rabbit bone marrow stromal cells (MSCs) via recombinant adeno-associated virus vectors (rAAV-hBMP-2). Thirty-two PLGA scaffolds, size (4 mm X 4 mm X 4 mm), were coated with collagen type I and equally divided into 2 groups. In group A, each scaffold was loaded with 2 X 10(4) hBMP-2 (+) MSCs to establish a hBMP-2 (+) MSCs/PLGA composite. In group B, each scaffold was loaded with 2 X 10(4) hBMP-2 (-) MSCs to establish a hBMP-2 (-) MSCs/PLGA composite. The composites in both groups were cultured for subcutaneous implantation in nude mice. All animals were killed 30 days after implantation and the differentiation of composites was evaluated. As a result, MSCs infected with rAAV-hBMP-2 efficiently expressed hBMP-2 protein. RP-based PLGA scaffolds had ideal microarchitecture. The diameters of macropore and micropore of the scaffolds were 300 microm and 3-5 microm, respectively. At 3-5 days after culture, a number of seeding cells well grew on the scaffolds of both groups. The composites in group A had chondrogenesis ability in vivo and the expression of collagen type II was positive. In group B, however, only polymers and fiber tissues were predominantly found. The percentage of polymer remnant area was significantly lower in group A than in group B (P<0.01). Our results therefore indicate that RP-based PLGA scaffolds efficiently coated with collagen type I have good biocompatibility with hBMP-2 (+) MSCs and the techniques developed in this study may favor cartilage tissue engineering.


Assuntos
Materiais Biocompatíveis , Condrogênese , Regeneração Tecidual Guiada , Ácido Láctico , Ácido Poliglicólico , Polímeros , Engenharia Tecidual , Animais , Células da Medula Óssea/citologia , Proteína Morfogenética Óssea 2 , Proteínas Morfogenéticas Ósseas/genética , Diferenciação Celular , Células Cultivadas , Regeneração Tecidual Guiada/métodos , Humanos , Implantes Experimentais , Masculino , Camundongos , Camundongos Nus , Copolímero de Ácido Poliláctico e Ácido Poliglicólico , Coelhos , Células Estromais/citologia , Engenharia Tecidual/métodos , Transfecção , Fator de Crescimento Transformador beta/genética
6.
Zhonghua Wai Ke Za Zhi ; 43(8): 531-4, 2005 Apr 15.
Artigo em Chinês | MEDLINE | ID: mdl-15938914

RESUMO

OBJECTIVE: To observe the treating effect of collage-heparin sulfate after the 10 mm rat sciatic nerve defect was bridged by it. METHODS: A new kind of nervous tissue engineering scaffold was produced by freeze-drying technique from collagen-heparin sulfate. Thirty-two SD rats were randomly divided into A, B, C and D groups. Sciatic nerve defect in group A was bridged by collagen-heparin sulfate. In group B, sciatic nerve was bridged by auto-nerve transplantation. Group C was the blank control group. Animals in group D were normal. And 10 mm sciatic nerve defect was bridged in the experiment. Thirty-six weeks after the operation, the experimental animals were detected by HRP labeled retrograde trace, HE staining, toluidine staining, silvering staining, S100, GAP-43 and NF immunohistological staining, MBP immunofluorescence staining and transmission electron microscope to observe the nerve regeneration inducing effect of this new scaffold. RESULTS: Nine months after operation, the collage-heparin sulfate scaffold was replaced by newly regenerated nerve. The number of HRP labeled spinal cord anterior horn cells and the area of sensation nerve fiber at the posterior horn were similar with that was repaired by auto-nerve. GAP-43, NF and S100 labeled regenerated nerve fiber had passed the total scaffold and entered the distal terminal. The regenerated nerve fibers were paralleled, lineage arranged, coincide with the prearranged regenerating "channel" in the collagen-heparin sulfate scaffold. MBP immunofluorescence staining also proved that the newly regenerated nerve fiber could be ensheathed. In the experimental group, the area of myelinated nerve fiber and the thickness of the myelin sheath had no obvious difference with that of the group repaired by auto-nerve, except that the density of the regenerated myelinated sheath fiber was lower than that of the control group. CONCLUSION: Nervous tissue engineering scaffold produced by collagen-heparin sulfate can guide the regeneration of nerve fibers. The nerve function recovers fine. This kind of material has great application potential.


Assuntos
Materiais Biocompatíveis , Heparitina Sulfato , Nervo Isquiático/cirurgia , Ésteres do Ácido Sulfúrico , Engenharia Tecidual/métodos , Animais , Masculino , Implantação de Prótese , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Nervo Isquiático/lesões , Nervo Isquiático/patologia
7.
Chin J Traumatol ; 6(1): 3-7, 2003 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-12542956

RESUMO

OBJECTIVE: To explore reciprocal action between BMP-2 (bone morphogenetic protein-2) and BMP-3 for better understanding of the mechanism of BMP during bone fracture union. METHODS: rhBMP-2 was added into the cultured fibroblasts with the concentration of 1,200 ng/ml. The expression of BMP-3 in fibroblasts was detected by immunohistochemistry. Eukaryotic expression vector pcDNA3-BMP-3 was transfected into the fibroblasts. After the effective expression of BMP-3 was identified, BMP-2 was also detected by immunohistochemistry in BMP-3 expression cells. The fibroblasts transfected with empty vector pcDNA3 were used as the control. RESULTS: Exogenous rhBMP-2 could promote the expression of BMP-3 in fibroblasts. BMP-3 also could be detected in these cells. CONCLUSIONS: BMP-2 and BMP-3 could reciprocally adjust the expression in fibroblasts.


Assuntos
Proteínas Morfogenéticas Ósseas/metabolismo , Fibroblastos/metabolismo , Consolidação da Fratura/fisiologia , Osteogênese/fisiologia , Fator de Crescimento Transformador beta , Proteína Morfogenética Óssea 2 , Proteína Morfogenética Óssea 3 , Células Cultivadas , Imuno-Histoquímica
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