ABSTRACT
Objective To explore the expressions of c-Met and c-Src in non-small cell lung cancer (NSCLC), and its relationship with clinical pathological characters and prognosis. Methods The c-Met and c-Src expressions were detected by immunohistochemistry in 88 patients with NSCLC from April 2011 to January 2013. The relationship between the expressions of c-Met and c-Src and clinical pathological features and prognosis were analyzed. Results The c-Met and c-Src were all significantly expressed in NSCLC tissues, and no expression showed in interstitial and normal lung tissues. The expressions of c-Met and c-Src in patients with NSCLC were associated with sex, differentiation, pathology type, T staging and TNM staging (P<0.05 or <0.01); and the expression of c-Met was associated with lymph node metastasis (P<0.01). The expressions of c-Met and c-Src in patients with NSCLC were not associated with age, and the expression of c-Src was not associated with lymph node metastasis (P>0.05). Pearson correlation analysis result showed that the expressions of c-Met and c-Src in lung cancer tissues was positive correlation (r=0.662, P<0.01). Kaplan-Meier survival curve analysis result showed that the disease free survival time (DFS) and overall survival time (OS) in c-Met high expression patients (51 cases) were significantly shorter than those in c-Met low expression patients (37 cases): (18.08 ± 1.34) months vs. (23.76 ± 1.79) months and (33.63 ± 1.95) months vs. (42.24 ± 2.68) months, the DFS and OS in c-Src high expression patients (25 cases) were significantly shorter than those in c-Src low expression patients (63 cases): (16.96 ± 2.56) months vs. (21.86 ± 1.15) months and (27.84 ± 2.89) months vs. (40.98 ± 1.81) months, the DFS and OS in both c-Met and c-Src high expression patients (25 cases) were significantly shorter than those in both c-Met and c-Src low expression patients (37 cases): (16.96 ± 2.56) months vs. (23.76 ± 1.79) months and (27.84 ± 2.89) months vs. (42.24 ± 2.68) months, and there were statistical differences (P<0.05). Cox multiplicity result showed that T staging (RR=2.174, 95％CI 1.354 to 3.490, P=0.001) and high expressions of c-Met and c-Src (RR=1.447, 95％CI 1.114 to 1.880, P=0.006) were the independent risk factors of DFS in patients with NSCLC;pathology type (RR=0.610, 95％CI 0.377 to 0.986, P=0.044), T staging (RR=2.215, 95％CI 1.357 to 3.616, P=0.001) and high expressions of c-Met and c-Src (RR=1.979, 95％CI 1.455 to 2.692, P = 0.000) were the independent risk factors of OS in patients with NSCLC. Conclusions The c-Met and c-Src are involved in the development of NSCLC and affect the prognosis of patients with NSCLC.
ABSTRACT
Hexachlorobenzene (HCB) is a widespread environmental pollutant and an endocrine disruptor. Chronic exposure of humans to HCB elicits porphyria, neurologic symptoms, immune disorders and thyroid dysfunctions. It is a dioxin-like compound and a weak ligand of the AhR (aryl hydrocarbon receptor), a transcription factor that modulates genes related to detoxification, proliferation, migration and invasion. This study was carried out to revise the results of HCB action on mammary gland and breast cancer, summarizing the main ideas of its mechanism of action. HCB increases tumor development and active c-Src/EGFR (epidermal growth factor receptor) signaling pathways, while reducing tyrosine537-ER-alpha (estrogen receptor-alpha) phosphorylation, and promoting a phenotype with enhanced malignancy and lung metastasis in different animal models. In a rat mammary gland, HCB promotes an estrogenic microenvironment by activation of ER-alpha and Insulin/IGFs (insulin growth factors) pathways. HCB induces cell proliferation, promoting cell cycle progression and enhancing cyclin D1 expression and c-Src/p27 interaction in (ER-alpha) MCF-7 human breast cancer cell line. In (ER-alpha)(-) MDA-MB-231 breast cancer cells, the pesticide enhances cell migration and invasion as well as metalloproteases and TGF-beta1 (transformig growth factor-beta1) expression. In conclusion our current study suggests that alterations in the estrogenic microenvironment may influence the biological behavior of mammary gland or breast tumors, leading to preneoplastic lesions or enhanced malignancy, respectively. Our findings suggest that HCB may be a risk factor for human breast cancer progression.
El hexaclorobenceno (HCB) es un contaminante ambiental ampliamente distribuido y un desorganizador endocrino. Su exposición crónica en seres humanos produce porfiria, síntomas neurológicos, trastornos inmunitarios y disfunciones tiroideas. Es un agonista débil del receptor de hidrocarburos aromáticos (AhR), un factor de transcripción que modula genes relacionados con el metabolismo de xenobióticos, la proliferación, la migración y la invasión. Nuestro objetivo es revisar los efectos del HCB en la glándula mamaria y el cáncer mamario, resumiendo los principales mecanismos de acción. El HCB aumenta el desarrollo tumoral y activa vías de señalización de c-Src/receptor del factor de crecimiento epidérmico (EGFR), mientras que disminuye la fosforilación de tirosina 537/receptor de estrógenos alfa (RE-alfa), promoviendo un fenotipo de mayor malignidad y metástasis pulmonar en diferentes modelos con animales. En la glándula mamaria de rata genera un microambiente estrogénico por activación del RE-alfa y las vías de insulina/factores de crecimiento similares a la insulina (IGF). En células de cáncer mamario humanas MCF-7 (RE-alfa) induce proliferación celular, promoviendo la progresión del ciclo, aumentando la ciclina D1 y la interacción p27/c-Src. En MDA-MB-231 (-RE-alfa) estimula la migración e invasión, así como la expresión de metaloproteasas y factor de crecimiento transformante beta 1 (TGF-beta 1). Estos estudios indican que las alteraciones en el microambiente estrogénico podrían influir el comportamiento biológico de la glándula mamaria y los tumores, lo que provoca lesiones preneoplásicas o aumento en la malignidad tumoral mamaria. Nuestros hallazgos sugieren que el HCB podría ser un factor de riesgo para la progresión del cáncer de mama humano.
Subject(s)
Humans , Pesticides , Breast Neoplasms , HexachlorobenzeneABSTRACT
Objective To study the effect of zoledronate (ZOL) on Ca2+/calmodulin-dependent kinase Ⅱ δ (CaMK Ⅱ δ) and down-stream gene expressions during osteoclast differentiation.Methods Mouse osteoclast precursors RAW264.7 cells were divided into the control group and ZOL group.The cells in both groups were induced with 50μg/L receptor activator of nuclear factor kappa B ligand (RANKL) and were harvested on 5 d,while the cells in ZOL group were also simultaneously treated with 1 × 10-6 mol/L ZOL for 2 d.Five days later,the cells were harvested and examined osteoclastogenesis,as well as gene expressions of CaMK Ⅱ δ,nuclear factor of activated T-cells cytoplasmic 1 (NFATc1),tartrate-resistant acid phosphatase (TRAP) and cell-sarcoma receptor coactivator (c-Src).Results The number of TRAP positive multinuclear osteoclasts,number and size of dentin absorption lacunae and area in the ZOL group were (20.0±3.2),(18.0±4.2) and (6 335.3± 1 043.2)μm2 respectively,which were significantly lower than (36.0 ± 8.4),(37.2 ± 5.0) and (11 636.2 ± 3 661.1) μm2 in the control group and decreased by 44.4 ％,51.6 ％ and 45.6 ％ respectively (P＜0.01).ZOL also significantly inhibited the gene expressions of CaMK Ⅱ δ,NFATc1,TRAP and c-Src,and the mRNA levels of these genes were decreased by 44.1％,49.0％,53.8％ and 49.6％ respectively,the protein level were decreased by 43.5 ％,32.2 ％,45.5 ％ and 48.0 ％ respectively.The immunofluorescent cytochemistry detection results showed the fluorescence intensity of CaMK Ⅱ δ,NFATc1,TRAP and c-Srcin in the ZOL group was significantly weakened when compared with the control group.Conclusion ZOL could significantly inhibit the osteoclast formation and bone absorption function,and down-regulates gene expressions of CaMK Ⅱ δ,NFATc1,TRAP and c-Src in osteoclast differentiation.
ABSTRACT
AIM: To investigate the effect of digoxin on apoptosis and growth in human gastric carcinoma SGC7901 cells and its possible mechanism.METHODS: SGC7901 cells were incubated in the medium containing digoxin at different concentrations for 24 h.CCK-8 assay was employed to detect the anti-tumor effect of digoxin on SGC7901 cells, and IC50 value of digoxin was calculated.Flow cytometry was used to determine the apoptosis and the cell cycle.Western blot was used to analyze the protein levels of c-Src, p-c-Src(Tyr416), Akt, p-Akt(Ser473), ERK1/2 and p-ERK1/2 (Tyr204).The mRNA expression of c-Src was by RT-PCR.RESULTS: As the concentration of digoxin increased, the cell viability was reduced gradually starting at 50 nmol/L digoxin treatment (P<0.05).The cell viability was reduced to the lowest extent by exposure to 500 nmol/L digoxin (P<0.05).The IC50 value of digoxin was 191.45 nmol/L for 24 h.After treatment with 200 nmol/L digoxin for 24 h, the apoptotic rate and the proportion of G0/G1 phase were significantly increased (P<0.05), the phosphorylated levels of c-Src, ERK1/2 and Akt declined (P<0.05), the mRNA and protein levels of c-Src were down-regulated (P<0.05) and the ability of migration was weaker (P<0.05) than that in control group.CONCLUSION: Digoxin may suppress the growth and induce the apoptosis of human gastric carcinoma SGC7901 cells by inhibiting the expression of c-Src gene and down-regulating the phosphorylated levels of ERK1/2 and Akt.
ABSTRACT
Objective To examine the role of c-Src activation in hepatitis B virus X (HBx) protein induced epithelial-mesenchymal transition (EMT) in liver cancer.Methods SMMC-7721 liver cancer cells were transfected with HBx gene to induce EMT and the activated c-Src expression was evaluated by Western blot.Both the morphological changes and the epithelial and mesenchymal markers expression (real-time PCR,western blot and immunocytochemistry) of HBx-transfected SMMC-7721 cell treated by c-Src kinase inhibitor PP2 and negative control PP3 were observed and compared,respectively.Results The activated c-Src expression in HBx gene transfected SMMC-7721 cells was significantly increased compared to that in mock transfected cells,c-Src kinase inhibitor PP2 could enable the HBx-transfected SMMC-7721 cells to transmit from spindle-like shape to original epithelial morphology.Western blot and immunocytochemistry confirmed that the expression of epithelial markers and mesenchymal markers almost returned to the levels of parental cells,indicating the mesenchymal-epithelial transition.Conclusions c-Src activation plays a key role in the process of EMT induced by HBx protein in SMMC-7721 cells.
ABSTRACT
Objective To screen for the proteins interacting with CXCR4 during nuclear localization in renal cell carcinoma (RCC) A498 cells. Methods Specific band in co-immunoprecipitation (Co-IP) experiments was sent for mass spectrometry. With the results of Co-IP experiments and mass spectrometry, the proteins interacting with CXCR4 were determined by bioinformatics analyses. Results Three specific bands were found after Co-IP with anti-CXCR4 antibody, and the results of mass spectrometry of the three specific bands showed 36 proteins possibly interacting with CXCR4. Bioinformatics analyses showed that NR1D2, c-src and HSPA8 might interact with CXCR4 and participate in CXCR4 nuclear localization. Conclusion NR1D2, c-src and HSPA8 might have participated in CXCR4 nuclear localization in RCC A498 cells.
ABSTRACT
Endoplasmic reticulum (ER) stress regulates a wide range of cellular responses including apoptosis, proliferation, inflammation, and differentiation in mammalian cells. In this study, we observed the role of 2-deoxy-D-glucose (2DG) on inflammation of chondrocytes. 2DG is well known as an inducer of ER stress, via inhibition of glycolysis and glycosylation. Treatment of 2DG in chondrocytes considerably induced ER stress in a dose- and time-dependent manner, which was demonstrated by a reduction of glucose regulated protein of 94 kDa (grp94), an ER stress-inducible protein, as determined by a Western blot analysis. In addition, induction of ER stress by 2DG led to the expression of COX-2 protein with an apparent molecular mass of 66-70kDa as compared with the normally expressed 72-74 kDa protein. The suppression of ER stress with salubrinal (Salub), a selective inhibitor of eif2-alpha dephosphorylation, successfully prevented grp94 induction and efficiently recovered 2DG-modified COX-2 molecular mass and COX-2 activity might be associated with COX-2 N-glycosylation. Also, treatment of 2DG increased phosphorylation of Src in chondrocytes. The inhibition of the Src signaling pathway with PP2 (Src tyrosine kinase inhibitor) suppressed grp94 expression and restored COX-2 expression, N-glycosylation, and PGE2 production, as determined by a Western blot analysis and PGE2 assay. Taken together, our results indicate that the ER stress induced by 2DG results in a decrease of the transcription level, the molecular mass, and the activity of COX-2 in rabbit articular chondrocytes via a Src kinase-dependent pathway.
Subject(s)
Animals , Rabbits , Cartilage, Articular/pathology , Cells, Cultured , Chondrocytes/drug effects , Cyclooxygenase 2/genetics , Deoxyglucose/pharmacology , Down-Regulation , Endoplasmic Reticulum/drug effects , Glycosylation/drug effects , Inflammation , Signal Transduction/drug effects , Stress, Physiological/drug effects , src-Family Kinases/metabolismABSTRACT
Lysophosphatidic acid (LPA) is a bioactive phospholipids and involves in various cellular events, including tumor cell migration. In the present study, we investigated LPA receptor and its transactivation to EGFR for cyclooxygenase-2 (COX-2) expression and cell migration in CAOV-3 ovarian cancer cells. LPA induced COX-2 expression in a dose-dependent manner, and pretreatment of the cells with pharmacological inhibitors of Gi (pertussis toxin), Src (PP2), EGF receptor (EGFR) (AG1478), ERK (PD98059) significantly inhibited LPA- induced COX-2 expression. Consistent to these results, transfection of the cells with selective Src siRNA attenuated COX-2 expression by LPA. LPA stimulated CAOV-3 cell migration that was abrogated by pharmacological inhibitors and antibody of EP2. Higher expression of LPA2 mRNA was observed in CAOV-3 cells, and transfection of the cells with a selective LPA2 siRNA significantly inhibited LPA-induced activation of EGFR and ERK, as well as COX-2 expression. Importantly, LPA2 siRNA also blocked LPA-induced ovarian cancer cell migration. Collectively, our results clearly show the significance of LPA2 and Gi/Src pathway for LPA-induced COX-2 expression and cell migration that could be a promising drug target for ovarian cancer cell metastasis.
Subject(s)
Female , Humans , Butadienes/pharmacology , Cell Line, Tumor , Cell Movement/drug effects , Cyclooxygenase 2/biosynthesis , Extracellular Signal-Regulated MAP Kinases/antagonists & inhibitors , Flavonoids/pharmacology , GTP-Binding Protein alpha Subunits, Gi-Go/antagonists & inhibitors , Lysophospholipids/pharmacology , Nitriles/pharmacology , Ovarian Neoplasms/metabolism , Pertussis Toxin/pharmacology , Protein-Tyrosine Kinases/antagonists & inhibitors , Proto-Oncogene Proteins/antagonists & inhibitors , Pyrimidines/pharmacology , ErbB Receptors/antagonists & inhibitors , Receptors, Lysophosphatidic Acid/metabolism , Receptors, Prostaglandin E/metabolism , Signal Transduction , Transcriptional Activation , Tyrphostins/pharmacologyABSTRACT
AIM: The aim of the present study was to clarify the mechanism of intracellular signal transduction in Ang Ⅱ- induced proliferation of vascular smooth muscular cells (VSMC) by observing the effect of c- Src on Ang Ⅱ- mediated mitogen- activated protein kinase (MAPK) activation and c- Fos protein expression in cultured VSMC of rats. METHODS: Cultured aortic VSMCs from SD rats were transfected with anti-sense c-Src oligodeoxynucleotides (ODNs) wrapt with lipofectin to inhibit c- Src activity and protein production. Untransfected VSMCs were used as control. We observed the role of Ang Ⅱ stimulation in MAPK activation and c- Fos protein expression. c- Src kinase activity was measured by protein immunoprecipitation and kinase autophosphorylation. The phosphorylation rate of the substrate myelin basic protein (MBP) was employed to assess MAPK activity.Western immunoblot was used to detect protein expression of c- Src and c-Fos. RESULTS: c-Src protein expression in VSMC transfected with different concentrations of anti- sense ODNs significantly decreased in a negative dose- effect manner. c- Src kinase activity was also markedly inhibited. Following the stimulation of Ang Ⅱ on transfected VSMCs with anti-sense ODNs, the increase rate of c- Src activity was 8.7% of that in control, the activity of MAPK was 1.6% compared with control and c- Fos protein expression was as 30.0% as that of control. CONCLUSION: Ang Ⅱ induces c- Src activation. MAPK activation and c - Fos protein expression by Ang Ⅱ is dependent on c- Src activation. These findings indicate that c- Src is an important signal factor in Ang Ⅱ-induced VSMC proliferation.
ABSTRACT
OBJECTIVE: The purpose of this study was to investigate the transcriptional expression and translational localization of c-Src and Csk, related to signal transduction of cell growth, differentiation, death, and DNA synthesis in the human endometrium during the normal menstrual cycle. METHODS: The specimens were obtained from the hysterectomized uterus and endometrial biopsies that showed no endometrial pathology. The mRNA level of c-Src and Csk were examined by RT-PCR and the expression of these proteins were confirmed by immunohistochemistry. RESULTS: The c-Src mRNA was strongly expressed at all phases, except in late secretory phase. The Csk mRNA was highly expressed at all phases. In stromal cells and glandular cells, immunohistochemical expression of c-Src protein was moderate in proliferative phase and was strong in the secretory phase. The expression of Csk protein was strong at all phases and more intensive in glandular cell than stromal cell. CONCLUSION: It is suggested that c-Src may play an important role in the signaling of the differentiation of the human endometrium and the Csk may modulate the c-Src kinase activity.
Subject(s)
Female , Humans , Biopsy , DNA , Endometrium , Immunohistochemistry , Menstrual Cycle , Pathology , Phosphotransferases , RNA, Messenger , Signal Transduction , Stromal Cells , UterusABSTRACT
Pervanadate, a complex of vanadate and H2O2, has an insulin mimetic effect, and acts as an inhibitor of protein tyrosine phosphatase. Pervanadate-induced phospholipase D (PLD) activation is known to be dependent on the tyrosine phosphorylation of cellular proteins and protein kinase C (PKC) activation, and yet underlying molecular mechanisms are not clearly understood. Here, we investigated the signaling pathway of pervanadate-induced PLD activation in Rat2 fibroblasts. Pervanadate increased PLD activity in dose- and time- dependent manner. Protein tyrosine kinase inhibitor, genistein, blocked PLD activation. Interestingly, AG-1478, a specific inhibitor of the tyrosine kinase activity of epidermal growth factor receptor (EGFR) blocked not only the PLD activation completely but also phosphorylation of p38 mitogen- activated protein kinase (MAPK). However, AG-1295, an inhibitor specific for the tyrosine kinase activity of pletlet drived growth factor receptor (PDGFR) did not show any effect on the PLD activation by pervanadate. We further found that pervanadate increased phosphorylation levels of p38, extracellular signal-regulated kinase (ERK) and c-Jun NH2-terminal kinase (JNK). SB203580, a p38 MAPK inhibitor, blocked the PLD activation completely. However, the inhibitions of ERK by the treatment of PD98059 or of JNK by the overexpression of JNK interacting peptide JBD did not show any effect on pervanadate-induced PLD activation. Inhibition or down-regulation of PKC did not alter the pervanadate-induced PLD activation in Rat2 cells. Thus, these results suggest that pervanadate-induced PLD activation is coupled to the transactivation of EGFR by pervanadate resulting in the activation of p38 MAP kinase.
Subject(s)
Animals , Rats , Cell Line , Enzyme Activation/drug effects , Fibroblasts , Mitogen-Activated Protein Kinases/metabolism , Phospholipase D/metabolism , ErbB Receptors/agonists , Vanadates/pharmacology , src-Family Kinases/metabolismABSTRACT
Src is a non-receptor protein tyrosine kinase activated by a number of extracellular signal moleculars. It is recruited to peripheral sites through myristoylation and the SH3 domain. Src initiates intracellular signal trandsduction pathways that influence cell adhesion, migration, growth, differentiation and survival though catalytic domain. Src is normally maintained in an inactive conformation because of carboxy terminal Src kinase, but can be activated transiently during cellular events such as mitosis or constitutively by abnormal events such as mutation and some cancers. In additions, c-Src protein is found to be highly activated and the Src gene is frequently over-expressed in many cancers. These findings suggest that the relationship between c-Src activation/over-expression and cancer progression appears to be significant.
ABSTRACT
AIM: To investigate whether or not short-term high pressur e proliferates human umbilical vein endothelial cells (HUVECs), and the role of pp60c-src in cell proliferation. METHODS: Cultured HUVECs of 3-6th passa ge were exposed to atmosphere 0 mmHg (AP), 120 mmHg (MP), 180 mmHg (HP) and interfered with cap top ril(Cap, 10 ?mol/L)or irbesartan(Irb, 10 ?mol/L) Cell proliferation was q uantified by measuring hexosaminidase activity. The content of pp 60 c-src in cells was investigated by Western blotting. RESULTS:① Hexos aminidase activities which reflected cell number increased significantly at 4 h in MP and HP(0 145?0 018 and 0 144?0 019 vs 0 118?0 003,P