Maritime English teaching has placed higher requirements on the part of the teachers. In combination with the requirements and the characteristics of maritime English teaching, this article puts forth new viewpoints f...Maritime English teaching has placed higher requirements on the part of the teachers. In combination with the requirements and the characteristics of maritime English teaching, this article puts forth new viewpoints for the self management of maritime English teachers and provides evidence in the aspects of theory and practice.展开更多
Background Transforming growth factor-β1 （TGF-β1） is known to have a role in keloid formation through the activation of fibroblasts and the acceleration of collagen deposition. The objective of this current study ...Background Transforming growth factor-β1 （TGF-β1） is known to have a role in keloid formation through the activation of fibroblasts and the acceleration of collagen deposition. The objective of this current study was to isolate TGF-β1 phage model peptides from a phage display 7-mer peptide library to evaluate their therapeutic effect on inhibiting the activity of keloid fibroblasts.Methods A phage display 7-mer peptide library was screened using monoclonal anti-human TGF-β1 as the target to obtain specific phages containing ectogenous model peptides similar to TGF-β1. Enzyme-linked immunosorbent assay （ELISA） was performed to select monoclonal phages with good binding activity, which underwent DNA sequencing. MTT assay and apoptosis assessment were used to evaluate the biological effects of the phage model peptides on keloid fibroblasts. Immunofluorescence assay was employed to show the binding affinity of the model peptides on phages causing keloid fibroblasts. Quantitative real-time PCR analysis was carried out to detect the expressions of nuclear factor κB （NF-κB） mRNA, connective tissue growth factor （CTGF） mRNA and TGF-β receptor Ⅱ （TβRII） mRNA in keloid fibroblasts.Results Specific phages with good results of ELISA were beneficiated. Four phage model peptides were obtained. The data of MTT showed that TGF-β1 and one phage model peptide （No. 4） could promote keloid fibroblasts proliferation,however, three phage model peptides （No. 1-3） could inhibit keloid fibroblasts proliferation. The results of apoptosis assessment showed that the three phage model peptides could slightly induce the apoptosis in keloid fibroblasts. The data of immunofluorescence assay revealed that the model peptides on phages rather than phages could bind to keloid fibroblasts. The findings of quantitative real-time PCR analysis suggested that the expressions of NF-κB mRNA and CTGF mRNA in the three phage model peptide groups decreased, while the expression of TβRII mRNA slightly increased.Conclusions Three phage model peptides isolated from a phage display 7-mer peptide library can inhibit keloid fibroblasts proliferation and induce the apoptosis in keloid fibroblasts. They can inhibit the activity of keloid fibroblasts by blocking TGF-β1 binding to its receptor and then regulating the expressions of NF-κB, CTGF and TβRII.展开更多
Background Random flap is one kind of the most widely used skin flaps in reconstructive surgery; however, partial necrosis of its distal end remains a significant problem now. The aim of this study was to evaluate the...Background Random flap is one kind of the most widely used skin flaps in reconstructive surgery; however, partial necrosis of its distal end remains a significant problem now. The aim of this study was to evaluate the effect of hypoxia preconditioned bone marrow mesenchymal stem cells （HpBMSCs） transplantation on ultra-long random skin flap survival in rats. Methods Normoxic bone marrow mesenchymal stem cells （nBMSCs） were cultured under normoxia （20% 02） and HpBMSCs under hypoxia （1% 02） for 48 hours before transplantation. Thirty Sprague-Dawley rats were randomly divided into control group, nBMSCs group and HpBMSCs group with each consisting of 10 rats. Survival area of ultra-long random skin flap on the dorsal of rats was measured seven days after flap surgery and cell transplantation. Cell survival in vivo, microvessel density and vascular endothelial growth factor （VEGF） were evaluated by histological examination and enzyme-linked immunosorbent assay. Results Compared with other two groups, flap survival area in HpBMSCs group was significantly larger （P 〈0.05）. Microvessel density in HpBMSCs group （36.20-.8.19） was higher than that in nBMSCs group （30.01-.5.68） and control group （17.60..4.19） （P 〈0.05）. VEGF in HpBMSCs group （（300.05-.50.41） pg/g） was higher than those in nBMSCs group （（240.55_＋33.64） pg/g） and control group （（191.65..32.58） pg/g） （P 〈0.05）. Conclusion HpBMSCs transplantation improves ultra-long random skin flap survival via promoting angiogenesis of more survival cells.展开更多
Background Keratinocyte growth factor （KGF） significantly influences epithelial wound healing. The aim of this study was to isolate KGF phage model peptides from a phage display 7-mer peptide library to evaluate the...Background Keratinocyte growth factor （KGF） significantly influences epithelial wound healing. The aim of this study was to isolate KGF phage model peptides from a phage display 7-mer peptide library to evaluate their effect on promoting epidermal cell proliferation. Methods A phage display 7-mer peptide library was screened using monoclonal anti-human KGF antibody as the target. Enzyme linked immunosorbent assay （ELISA） was performed to select monoclonal phages with good binding activity. DNA sequencing was done to find the similarities of model peptides. Three-（4,5-dimethylthiazol-2-yl） -2,5-diphenyl tetrazolium bromide （MTT） assay, immunofluorescence assay and quantitative real-time PCR analysis were employed to evaluate the effect of the phage model peptides on epidermal cells. Results Thirty-three out of fifty-eight （56.9%） of the isolated monoclonal phages exhibited high binding activity by ELISA. Ten of fifteen obtained phage model peptides were similar to KGF or epidermal growth factor （EGF）. MTT assay data showed that four （No. 1-4） of the ten phage model peptides could promote epidermal cell proliferation. The expression of keratinocyte growth factor receptor （KGFR） mRNA in the KGF control group and the two phage model peptide groups （No. 1 and No. 2） increased. Expression of c-Fos mRNA and c-Jun mRNA in the KGF control group increased, but did not increase in the four phage model peptide groups （No.1-4）. Conclusion Four phage model peptides isolated from the phage display 7-mer peptide library can safely promote epidermal cell proliferation without tumorigenic effect.展开更多
文摘Maritime English teaching has placed higher requirements on the part of the teachers. In combination with the requirements and the characteristics of maritime English teaching, this article puts forth new viewpoints for the self management of maritime English teachers and provides evidence in the aspects of theory and practice.
基金This study was supported by grants from the Nationa1 Natura1 Science Foundation of China （No. 30670571, 30772258 and 81071560）, Science and Technology Research Program of Shandong Province （No. 2009GG10002078）, Scientific Research Development Plan of the Department of Education of Shandong Province （No. J07WD03） and National Basic Research Program of China （973 Program） （No. 2005CB522603）.
文摘Background Transforming growth factor-β1 （TGF-β1） is known to have a role in keloid formation through the activation of fibroblasts and the acceleration of collagen deposition. The objective of this current study was to isolate TGF-β1 phage model peptides from a phage display 7-mer peptide library to evaluate their therapeutic effect on inhibiting the activity of keloid fibroblasts.Methods A phage display 7-mer peptide library was screened using monoclonal anti-human TGF-β1 as the target to obtain specific phages containing ectogenous model peptides similar to TGF-β1. Enzyme-linked immunosorbent assay （ELISA） was performed to select monoclonal phages with good binding activity, which underwent DNA sequencing. MTT assay and apoptosis assessment were used to evaluate the biological effects of the phage model peptides on keloid fibroblasts. Immunofluorescence assay was employed to show the binding affinity of the model peptides on phages causing keloid fibroblasts. Quantitative real-time PCR analysis was carried out to detect the expressions of nuclear factor κB （NF-κB） mRNA, connective tissue growth factor （CTGF） mRNA and TGF-β receptor Ⅱ （TβRII） mRNA in keloid fibroblasts.Results Specific phages with good results of ELISA were beneficiated. Four phage model peptides were obtained. The data of MTT showed that TGF-β1 and one phage model peptide （No. 4） could promote keloid fibroblasts proliferation,however, three phage model peptides （No. 1-3） could inhibit keloid fibroblasts proliferation. The results of apoptosis assessment showed that the three phage model peptides could slightly induce the apoptosis in keloid fibroblasts. The data of immunofluorescence assay revealed that the model peptides on phages rather than phages could bind to keloid fibroblasts. The findings of quantitative real-time PCR analysis suggested that the expressions of NF-κB mRNA and CTGF mRNA in the three phage model peptide groups decreased, while the expression of TβRII mRNA slightly increased.Conclusions Three phage model peptides isolated from a phage display 7-mer peptide library can inhibit keloid fibroblasts proliferation and induce the apoptosis in keloid fibroblasts. They can inhibit the activity of keloid fibroblasts by blocking TGF-β1 binding to its receptor and then regulating the expressions of NF-κB, CTGF and TβRII.
基金The study was funded by grants from National Natural Science Foundation of China （No. 30900309, 30772269） and Graduate Independent Innovation Foundation of Shandong University （No. yzc09085）.
文摘Background Random flap is one kind of the most widely used skin flaps in reconstructive surgery; however, partial necrosis of its distal end remains a significant problem now. The aim of this study was to evaluate the effect of hypoxia preconditioned bone marrow mesenchymal stem cells （HpBMSCs） transplantation on ultra-long random skin flap survival in rats. Methods Normoxic bone marrow mesenchymal stem cells （nBMSCs） were cultured under normoxia （20% 02） and HpBMSCs under hypoxia （1% 02） for 48 hours before transplantation. Thirty Sprague-Dawley rats were randomly divided into control group, nBMSCs group and HpBMSCs group with each consisting of 10 rats. Survival area of ultra-long random skin flap on the dorsal of rats was measured seven days after flap surgery and cell transplantation. Cell survival in vivo, microvessel density and vascular endothelial growth factor （VEGF） were evaluated by histological examination and enzyme-linked immunosorbent assay. Results Compared with other two groups, flap survival area in HpBMSCs group was significantly larger （P 〈0.05）. Microvessel density in HpBMSCs group （36.20-.8.19） was higher than that in nBMSCs group （30.01-.5.68） and control group （17.60..4.19） （P 〈0.05）. VEGF in HpBMSCs group （（300.05-.50.41） pg/g） was higher than those in nBMSCs group （（240.55_＋33.64） pg/g） and control group （（191.65..32.58） pg/g） （P 〈0.05）. Conclusion HpBMSCs transplantation improves ultra-long random skin flap survival via promoting angiogenesis of more survival cells.
基金This study was supported by grants from the National Natural Science Foundation of China （No. 30670571 and No. 30772258）, Science and Technology Research Program of Shandong Province （No. 2009GG10002078）, Scientific Research Development Plan of the Department of Education of Shandong Province （No. J07WD03） and National Basic Research Program of China （973 Program, No. 2005CB522603）.
文摘Background Keratinocyte growth factor （KGF） significantly influences epithelial wound healing. The aim of this study was to isolate KGF phage model peptides from a phage display 7-mer peptide library to evaluate their effect on promoting epidermal cell proliferation. Methods A phage display 7-mer peptide library was screened using monoclonal anti-human KGF antibody as the target. Enzyme linked immunosorbent assay （ELISA） was performed to select monoclonal phages with good binding activity. DNA sequencing was done to find the similarities of model peptides. Three-（4,5-dimethylthiazol-2-yl） -2,5-diphenyl tetrazolium bromide （MTT） assay, immunofluorescence assay and quantitative real-time PCR analysis were employed to evaluate the effect of the phage model peptides on epidermal cells. Results Thirty-three out of fifty-eight （56.9%） of the isolated monoclonal phages exhibited high binding activity by ELISA. Ten of fifteen obtained phage model peptides were similar to KGF or epidermal growth factor （EGF）. MTT assay data showed that four （No. 1-4） of the ten phage model peptides could promote epidermal cell proliferation. The expression of keratinocyte growth factor receptor （KGFR） mRNA in the KGF control group and the two phage model peptide groups （No. 1 and No. 2） increased. Expression of c-Fos mRNA and c-Jun mRNA in the KGF control group increased, but did not increase in the four phage model peptide groups （No.1-4）. Conclusion Four phage model peptides isolated from the phage display 7-mer peptide library can safely promote epidermal cell proliferation without tumorigenic effect.
