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The relationship between platelet-derived growth factor expression and angiogenesis/lymphangiogenesis

Guocheng LIU MD, Shouhua YANG MD, Zehua WANG MD,

《医学前沿(英文)》 2009年 第3卷 第4期   页码 447-451 doi: 10.1007/s11684-009-0082-x

摘要: This paper is aimed to examine if changes in platelet-derived growth factor (PDGF) expression at different stages of cervical cancer are related to the variation in blood vessel density (BVD) and lymphatic vessel density (LVD) to evaluate the relationship between PDGF expression and stages and metastasis of cervical cancer. Polymerase chain reaction (PCR) and RT-PCR were used to detect the expression levels of PDGF in 45 cervical cancer tissue samples (the experimental group). The samples were immunohistochemically stained with monoclonal antibodies D2-40 and CD34, and BVD and LVD were measured. The expressions of PDGF-A, -B, and- D were all higher in the experimental group than in the control group (<0.05); no significant difference was found in the expression of PDGF-C between the experimental group and the control group (>0.05). PDGF-A and -B expression was positively related with BVD and LVD (<0.01, R= 0.49, 0.527, 0.327, 0.68). The expression levels of PDGF-C and -D were not significantly related with BVD and LVD. At the early stage of cervical cancer, BVD and LVD were significantly higher than in the controls (<0.01). The BVD and LVD in tissues in the surrounding areas of cervical cancer were significantly higher than in tissues at cancer center, and LVD was related to lymph node metastasis (<0.001). BVD and LVD were not associated with the differentiation and pathological stages of cervical cancer. The expressions of PDGF-A, -B, and -D in cervical cancer were closely related with the clinical stages of cervical cancer. PDGF-A and -B were intimately associated with the lymph node metastasis and prognosis of cervical cancer.

关键词: cervical cancer     lymphatic vessel density     blood vessel density     platelet-derived growth factor    

Involvement of p38 mitogen-activated protein kinase in the regulation of platelet-derived growth factor

GONG Xiaowei, WEI Jie, LI Yusheng, CHENG Weiwei, DENG Peng, JIANG Yong

《医学前沿(英文)》 2007年 第1卷 第3期   页码 248-252 doi: 10.1007/s11684-007-0047-x

摘要: The aim of this study was to investigate the role of p38 mitogen-activated protein kinase (MAPK) in cell migration induced by platelet-derived growth factor (PDGF). Western blot was performed to detect the phosphorylation of p38 in NIH3T3 cells treated with PDGF. A Transwell cell migration system was used to determine the effects of PDGF treatment on the migration of NIH3T3 cells and the influence of deficiency on this process in a gene knockout (p38) mouse embryonic fibroblast cell line. On the stimulation of PDGF, the migration of NIH3T3 cells was significantly increased (〈0.001) compared to the control and p38 MAP kinase was simultaneously phosphorylated. Furthermore, the PDGF-induced cell migration was significantly blocked in gene knockout (p38) mouse embryonic fibroblasts (MEFs) (〈0.001) as compared with the wild type cells (p38). p38 MAPK plays an important role in the regulation of cell migration induced by PDGF.

关键词: control     stimulation     mitogen-activated     growth factor     process    

Expression of PC-cell-derived growth factor in breast cancer

Haiping SONG MD, Lan SHI MD, Chunping LIU MD, Tao HUANG MD,

《医学前沿(英文)》 2009年 第3卷 第4期   页码 426-430 doi: 10.1007/s11684-009-0085-7

摘要: This study is mainly aimed at evaluating the expression of PC-cell-derived growth factor (PCDGF) in breast cancer and breast adenofibroma, and to compare with other commonly used clinical pathological indices, then to investigate the diagnostic and targeted therapeutic purpose of PCDGF in breast cancer tissue. In this study, we detected the expression of PCDGF, p53 and CerbB-2 in breast cancer tissue and the expression of PCDGF in breast adenofibroma tissue by immunohistochemical method, and analyzed the relationship between them. We found that PCDGF was expressed in most breast cancer tissue, but was not in breast adenofibroma tissue, and the expression of PCDGF was related with the tumor’s pathological category and the expression of estrogen receptor (ER) and progesterone receptor (PR) and p53, but there was no statistical dependability between PCDGF and cerbB-2. From this study, we predict that PCDGF may serve as a marker in the secondary diagnosis of breast cancer, and may participate in the generation and differentiation of breast cancer cells, and become an effective target of therapy for breast cancer.

关键词: PC-cell-derived growth factor     breast neoplasms     clinical markers    

Tramadol reinforces antidepressant effects of ketamine with increased levels of brain-derived neurotrophicfactor and tropomyosin-related kinase B in rat hippocampus

null

《医学前沿(英文)》 2012年 第6卷 第4期   页码 411-415 doi: 10.1007/s11684-012-0226-2

摘要:

Ketamine exerts rapid and robust antidepressant properties in both animal models and depressed patients and tramadol possesses potential antidepressant effects. Brain-derived neurotrophic factor (BDNF) is an important biomarker for mood disorders and tropomyosin-related kinase B (TrkB) is a high affinity catalytic receptor for BDNF. We hypothesized that tramadol pretreatment might reinforce ketamine-elicited antidepressant effects with significant changes in hippocampal BDNF and TrkB levels in rats. Immobility time of rats receiving different treatment in the forced swimming test (FST) was observed. Levels of BDNF and TrkB in hippocampus were measured by enzyme linked immunosorbent assay. Results showed that tramadol (5 mg/kg) administrated alone neither elicited antidepressant effects nor altered BDNF or TrkB level. However, pretreatment with tramadol (5 mg/kg) enhanced the ketamine (10 mg/kg) -elicited antidepressant effects and upregulated the BDNF and TrkB levels in hippocampus. In conclusion, tramadol pretreatment reinforces the ketamine-elicited antidepressant effects, which is associated with the increased levels of BDNF and TrkB in rat hippocampus.

关键词: tramadol     ketamine     antidepressant     brain-derived neurotrophic factor     tropomyosin-related kinase B    

Fibroblast growth factor 21: a novel metabolic regulator from pharmacology to physiology

null

《医学前沿(英文)》 2013年 第7卷 第1期   页码 25-30 doi: 10.1007/s11684-013-0244-8

摘要:

Fibroblast growth factor 21 (FGF21) is a member of the fibroblast growth factor family. It actually functions as endocrine hormones but does not regulate cell growth and differentiation. It is demonstrated that FGF21 acts on multiple tissue to coordinate carbohydrate and lipid metabolism, including enhancing insulin sensitivity, decreasing triglyceride concentrations, causing weight loss, ameliorating obesity-associated hyperglycemia and hyperlipidemia. Moreover, FGF21 also plays important roles in some physiological processes, such as fasting and feeding, growth hormone axis and thermogenic function of brown adipose tissue. Clinical relevance of FGF21 in humans is still unclear, and the basis and consequences of increased FGF21 in metabolic disease remain to be determined. Both the pharmacological actions and physiological roles make FGF21 attractive drug candidates for treating metabolic disease, but some questions remain to be answered. This article concentrates on recent advances in our understanding of FGF21.

关键词: FGF21     metabolism     pharmacology     physiology     clinical relevance    

>In situ growth of phosphorized ZIF-67-derived amorphous CoP/Cu2O@CF electrocatalyst

《化学科学与工程前沿(英文)》 2023年 第17卷 第10期   页码 1430-1439 doi: 10.1007/s11705-023-2320-1

摘要: Transition metal phosphides have been extensively studied for catalytic applications in water splitting. Herein, we report an in situ phosphorization of zeolitic imidazole frameworks (ZIF-67) to generate amorphous cobalt phosphide/ZIF-67 heterojunction on a self-supporting copper foam (CF) substrate with excellent performance for hydrogen evolution reaction (HER). The needle-leaf like copper hydroxide was anchored on CF surface, which acted as implantation to grow ZIF-67. The intermediate product was phosphorized to obtain final electrocatalyst (CoP/Cu2O@CF) with uniform particle size, exhibiting a rhombic dodecahedron structure with wrinkles on the surface. The electrochemical measurement proved that CoP/Cu2O@CF catalyst exhibited excellent HER activity and long-term stability in 1.0 mol·L–1 KOH solution. The overpotential was only 62 mV with the Tafel slope of 83 mV·dec–1 at a current density of 10 mA·cm–2, with a large electrochemical active surface area. It also showed competitive performance at large current which indicated the potential application to industrial water electrolysis to produce hydrogen. First-principle calculations illustrated that benefit from the construction of CoP/ZIF-67 heterojunction, the d-band center of CoP downshifted after bonding with ZIF-67 and the Gibbs free energy (ΔGH*) changed from –0.18 to –0.11 eV, confirming both decrease in overpotential and excellent HER activity. This work illustrates the efficient HER activity of CoP/Cu2O@CF catalyst, which will act as a potential candidate for precious metal electrocatalysts.

关键词: CoP/Cu2O@CF     electrocatalyst     phosphorization     HER     DFT    

Mechanism of vascular endothelial growth factor on the prevention of restenosis after angioplasty

Qigong LIU, Honglian ZHOU, Yan ZENG, Shan YE, Jiani LIU, Zaiying LU

《医学前沿(英文)》 2009年 第3卷 第2期   页码 177-180 doi: 10.1007/s11684-009-0021-x

摘要: To evaluate the mechanism of vascular endothelial growth factor (VEGF) on the prevention of restenosis after angioplasty, the recombinant adenovirus vector containing hVEGF cDNA was constructed and transfected into vascular smooth muscle cells (VSMC) . The conditioned medium containing VEGF was collected 72 h after the infection. Then, the VSMC and human umbilical vein endothelial cells (HUVEC) were divided into control group, H O -treated group and H O +VEGF-treated group to observe the proliferation and apoptosis by water soluble tetrazolium (WST-1) method, nick end labeling (TUNEL) and flow cytometry (FCM). Compared with the control and H O +VEGF-treated groups, the absorbance ( ) value of HUVEC was decreased, and apoptosis of HUVEC was significantly increased in H O -treated group. The changes of value and apoptosis of VSMC were contrary to those of HUVEC. H O could stimulate the proliferation of VSMC and induce the apoptosis of HUVEC, inhibit the proliferation of HUVEC and the apoptosis of VSMC and induce restenosis. VEGF could inhibit the effect of H O on HUVEC and VSMC and prevent restenosis. These results offered further theoretical evidence for VEGF on the prevention of restenosis after angioplasty.

关键词: vascular endothelial growth factors     restenosis     reactive oxygen species     endothelial cells     vascular smooth muscle cell    

An investigation on prevalent strategies for XFEM-based numerical modeling of crack growth in porous

《结构与土木工程前沿(英文)》 2021年 第15卷 第4期   页码 914-936 doi: 10.1007/s11709-021-0750-8

摘要: Crack growth modeling has always been one of the major challenges in fracture mechanics. Among all numerical methods, the extended finite element method (XFEM) has recently attracted much attention due to its ability to estimate the discontinuous deformation field. However, XFEM modeling does not directly lead to reliable results, and choosing a strategy of implementation is inevitable, especially in porous media. In this study, two prevalent XFEM strategies are evaluated: a) applying reduced Young’s modulus to pores and b) using different partitions to the model and enriching each part individually. We mention the advantages and limitations of each strategy via both analytical and experimental validations. Finally, the crack growth is modeled in a natural porous media (Fontainebleau sandstone). Our investigations proved that although both strategies can identically predict the stress distribution in the sample, the first strategy simulates only the initial crack propagation, while the second strategy could model multiple cracks growths. Both strategies are reliable and highly accurate in calculating the stress intensity factor, but the second strategy can compute a more reliable reaction force. Experimental tests showed that the second strategy is a more accurate strategy in predicting the preferred crack growth path and determining the maximum strength of the sample.

关键词: numerical modeling     extended finite element method     porous media     crack growth     stress intensity factor    

Repurposed benzydamine targeting CDK2 suppresses the growth of esophageal squamous cell carcinoma

《医学前沿(英文)》 2023年 第17卷 第2期   页码 290-303 doi: 10.1007/s11684-022-0956-8

摘要: Esophageal squamous cell carcinoma (ESCC) is one of the leading causes of cancer death worldwide. It is urgent to develop new drugs to improve the prognosis of ESCC patients. Here, we found benzydamine, a locally acting non-steroidal anti-inflammatory drug, had potent cytotoxic effect on ESCC cells. Benzydamine could suppress ESCC proliferation in vivo and in vitro. In terms of mechanism, CDK2 was identified as a target of benzydamine by molecular docking, pull-down assay and in vitro kinase assay. Specifically, benzydamine inhibited the growth of ESCC cells by inhibiting CDK2 activity and affecting downstream phosphorylation of MCM2, c-Myc and Rb, resulting in cell cycle arrest. Our study illustrates that benzydamine inhibits the growth of ESCC cells by downregulating the CDK2 pathway.

关键词: benzydamine     cyclin-dependent kinase 2     patient-derived xenograft     esophageal squamous cell carcinoma    

Role of nitric oxide in biological effects of vascular endothelial growth factor

Qigong LIU M D , Yan ZENG , Jiani LIU , Shan YE , Yongdong LI , Zaiying LU M D ,

《医学前沿(英文)》 2009年 第3卷 第3期   页码 284-286 doi: 10.1007/s11684-009-0062-1

摘要: To evaluate the role of nitric oxide in the biological effects of vascular endothelial growth factor (VEGF) and the possible mechanism of VEGF, the cultured vascular endothelial cells of rabbit aorta were divided into control group, VEGF-treated group and VEGF+ -nitro-L-arginine methyl ester (L-NAME)-treated group. The absorbance () value of vascular endothelial cells and the levels of prostaglandin (PGI), endothelin-1 (ET-1) and von Willebrand factor (vWF) in the supernatant were observed by water-soluble tetrazolium salt assay, radioimmunoassay and enzyme-linked immunosorbent assay. The values and PGI in VEGF-treated group and VEGF+L-NAME-treated group were higher than those in control group (<0.05 and <0.01). The ET-1 and vWF were significantly decreased in VEGF-treated group and VEGF+L-NAME-treated group compared with the control (<0.05 and <0.01). These results indicate that VEGF could promote the proliferation and secretion of PGI and inhibit the secretion of ET-1 and vWF in vascular endothelial cells and that L-NAME could inhibit the effect of VEGF partially. Nitric oxide is an important mediator in the process of stimulating proliferation and regulating secretion of vascular endothelial cells by VEGF.

关键词: vascular endothelial growth factor     nitric oxide     N-nitro-L-arginine methyl ester     vascular endothelial cells    

monophosphate-specific phosphodiesterase 5 prevented cardiac fibrosis through inhibition of transforming growthfactor β-induced Smad signaling

null

《医学前沿(英文)》 2014年 第8卷 第4期   页码 445-455 doi: 10.1007/s11684-014-0378-3

摘要:

Recent evidences suggested that cyclic guanosine monophosphate-specific phosphodiesterase 5 (PDE5) inhibitor represents an important therapeutic target for cardiovascular diseases. Whether and how it ameliorates cardiac fibrosis, a major cause of diastolic dysfunction and heart failure, is unknown. The purpose of this study was to investigate the effects of PDE5 inhibitor on cardiac fibrosis. We assessed cardiac fibrosis and pathology in mice subjected to transverse aortic constriction (TAC). Oral sildenafil, a PDE5 inhibitor, was administered in the therapy group. In control mice, 4 weeks of TAC induced significant cardiac dysfunction, cardiac fibrosis, and cardiac fibroblast activation (proliferation and transformation to myofibroblasts). Sildenafil treatment markedly prevented TAC-induced cardiac dysfunction, cardiac fibrosis and cardiac fibroblast activation but did not block TAC-induced transforming growth factor-β1 (TGF-β1) production and phosphorylation of Smad2/3. In isolated cardiac fibroblasts, sildenafil blocked TGF-β1-induced cardiac fibroblast transformation, proliferation and collagen synthesis. Furthermore, we found that sildenafil induced phosphorylated cAMP response element binding protein (CREB) and reduced CREB-binding protein 1 (CBP1) recruitment to Smad transcriptional complexes. PDE5 inhibition prevents cardiac fibrosis by reducing CBP1 recruitment to Smad transcriptional complexes through CREB activation in cardiac fibroblasts.

关键词: PDE5     cardiac fibrosis     TGF-β     CREB    

Overcoming resistance to endocrine therapy in hormone receptor-positive human epidermal growth factor

Wenjie Zhu, Binghe Xu

《医学前沿(英文)》 2021年 第15卷 第2期   页码 208-220 doi: 10.1007/s11684-020-0795-4

摘要: New targeted therapies have been developed to overcome resistance to endocrine therapy (ET) and improve the outcome of HR /HER2 advanced breast cancer (ABC). We conducted a meta-analysis and systemic review on randomized controlled trials evaluating various targeted therapies in combination with ET in HR /HER2 ABC. PUBMED and EMBASE databases were searched for eligible trials. Hazard ratios (HRs) for progression-free survival (PFS), odds ratios (ORs) for objective response rate (ORR), clinical benefit rate (CBR), and toxicity were meta-analyzed. Twenty-six studies with data on 10 347 patients were included and pooled. The addition of cyclin-dependent kinase 4/6 inhibitors to ET significantly improved median PFS (pooled HR= 0.547, <0.001), overall survival (pooled HR= 0.755, <0.001), and tumor response rates (ORR, pooled OR= 1.478, <0.001; CBR, pooled OR= 1.201, <0.001) with manageable toxicities (pooled OR= 3.280, <0.001). The mammalian targets of rapamycin inhibitors and exemestane were not clinically beneficial for this pooled population including ET-naïve and ET-resistant patients. Moderate improvement in PFS (pooled HR= 0.686, <0.001) yet pronounced toxicities (pooled OR= 2.154, <0.001) were noted in the combination of phosphatidylinositol-4,5-bisphosphate 3-kinase inhibitors with fulvestrant. Future studies are warranted to optimize the population and the dosing sequence of these available options.

关键词: endocrine-resistant     HR+/HER2- advanced breast cancer     randomized clinical trials     meta-analysis     targeted therapy    

Abivertinib inhibits megakaryocyte differentiation and platelet biogenesis

《医学前沿(英文)》 2022年 第16卷 第3期   页码 416-428 doi: 10.1007/s11684-021-0838-5

摘要: Abivertinib, a third-generation tyrosine kinase inhibitor, is originally designed to target epidermal growth factor receptor (EGFR)-activating mutations. Previous studies have shown that abivertinib has promising antitumor activity and a well-tolerated safety profile in patients with non-small-cell lung cancer. However, abivertinib also exhibited high inhibitory activity against Bruton’s tyrosine kinase and Janus kinase 3. Given that these kinases play some roles in the progression of megakaryopoiesis, we speculate that abivertinib can affect megakaryocyte (MK) differentiation and platelet biogenesis. We treated cord blood CD34+ hematopoietic stem cells, Meg-01 cells, and C57BL/6 mice with abivertinib and observed megakaryopoiesis to determine the biological effect of abivertinib on MK differentiation and platelet biogenesis. Our in vitro results showed that abivertinib impaired the CFU-MK formation, proliferation of CD34+ HSC-derived MK progenitor cells, and differentiation and functions of MKs and inhibited Meg-01-derived MK differentiation. These results suggested that megakaryopoiesis was inhibited by abivertinib. We also demonstrated in vivo that abivertinib decreased the number of MKs in bone marrow and platelet counts in mice, which suggested that thrombopoiesis was also inhibited. Thus, these preclinical data collectively suggested that abivertinib could inhibit MK differentiation and platelet biogenesis and might be an agent for thrombocythemia.

关键词: abivertinib     Btk inhibitor     platelet     megakaryocyte     megakaryopoiesis     thrombopoiesis    

FGF23 associated bone diseases

null

《医学前沿(英文)》 2013年 第7卷 第1期   页码 65-80 doi: 10.1007/s11684-013-0254-6

摘要:

Recently, fibroblast growth factor 23 (FGF23) has sparked widespread interest because of its potential role in regulating phosphate and vitamin D metabolism. In this review, we summarized the FGF superfamily, the mechanism of FGF23 on phosphate and vitamin D metabolism, and the FGF23 related bone disease.

关键词: fibroblast growth factor 23     FGF receptor     phosphate metabolism     Klotho     bone disease    

星突江鲽胰岛素样生长因子I的体外重组表达及生物活性分析

徐永江,臧 坤,柳学周,史 宝,陈圣毅

《中国工程科学》 2015年 第17卷 第1期   页码 67-73

摘要:

为了在蛋白水平认识星突江鲽(Platichthys stellatus)胰岛素样生长因子I(IGF-I)的生长调控作用及机制,采用RT-PCR方法扩增了其成熟肽片段,利用原核表达载体pET-28a成功构建了重组星突江鲽IGF-I/pET-28a质粒,转化至大肠杆菌BL21(DE3)后经IPTG诱导获得了N端含6个组氨酸的重组星突江鲽IGF-I蛋白。获得的重组IGF-I蛋白大小为12.1 kD,37 ℃下用0.5 mmol/L的异丙基-β-D-硫代半乳糖苷(IPTG)诱导3 h时目的蛋白表达量最高,占菌体总蛋白的39.8 %,主要以包涵体形式存在。Western blotting免疫印迹表明星突江鲽IGF-I重组蛋白均可被6×His抗体特异性识别。包涵体经6 mol/L盐酸胍变性、Ni2+离子亲和柱纯化和尿素梯度复性后,可获得高纯度的IGF-I重组蛋白。细胞增殖试验结果显示0.6 μg/mL 的星突江鲽IGF-I重组蛋白能显著促进人胚胎肾细胞HEK293T的增殖而大于1.8 μg/mL时则表现出抑制作用。本研究成功构建了星突江鲽IGF-I体外高效表达系统,并获得具有细胞水平生物活性的星突江鲽IGF-I重组蛋白,结果可为深入探究IGF-I在星突江鲽生长发育中的作用机制及研制高效绿色的促生长制剂提供基础资料。

关键词: 星突江鲽;胰岛素样生长因子I;原核表达;生物活性    

标题 作者 时间 类型 操作

The relationship between platelet-derived growth factor expression and angiogenesis/lymphangiogenesis

Guocheng LIU MD, Shouhua YANG MD, Zehua WANG MD,

期刊论文

Involvement of p38 mitogen-activated protein kinase in the regulation of platelet-derived growth factor

GONG Xiaowei, WEI Jie, LI Yusheng, CHENG Weiwei, DENG Peng, JIANG Yong

期刊论文

Expression of PC-cell-derived growth factor in breast cancer

Haiping SONG MD, Lan SHI MD, Chunping LIU MD, Tao HUANG MD,

期刊论文

Tramadol reinforces antidepressant effects of ketamine with increased levels of brain-derived neurotrophicfactor and tropomyosin-related kinase B in rat hippocampus

null

期刊论文

Fibroblast growth factor 21: a novel metabolic regulator from pharmacology to physiology

null

期刊论文

>In situ growth of phosphorized ZIF-67-derived amorphous CoP/Cu2O@CF electrocatalyst

期刊论文

Mechanism of vascular endothelial growth factor on the prevention of restenosis after angioplasty

Qigong LIU, Honglian ZHOU, Yan ZENG, Shan YE, Jiani LIU, Zaiying LU

期刊论文

An investigation on prevalent strategies for XFEM-based numerical modeling of crack growth in porous

期刊论文

Repurposed benzydamine targeting CDK2 suppresses the growth of esophageal squamous cell carcinoma

期刊论文

Role of nitric oxide in biological effects of vascular endothelial growth factor

Qigong LIU M D , Yan ZENG , Jiani LIU , Shan YE , Yongdong LI , Zaiying LU M D ,

期刊论文

monophosphate-specific phosphodiesterase 5 prevented cardiac fibrosis through inhibition of transforming growthfactor β-induced Smad signaling

null

期刊论文

Overcoming resistance to endocrine therapy in hormone receptor-positive human epidermal growth factor

Wenjie Zhu, Binghe Xu

期刊论文

Abivertinib inhibits megakaryocyte differentiation and platelet biogenesis

期刊论文

FGF23 associated bone diseases

null

期刊论文

星突江鲽胰岛素样生长因子I的体外重组表达及生物活性分析

徐永江,臧 坤,柳学周,史 宝,陈圣毅

期刊论文