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1.
Yuru Luo Ruiqi Zhang Jing Gao Yali Wang Weimin Zhang Suzhu Qing 《Reproduction in domestic animals》2020,55(7):822-832
Epidermal growth factor (EGF) is one of the important regulatory factors of EGF family. EGF has been indicated to effectively inhibit the apoptosis of follicular cells, to promote the proliferation of granulosa cells and the maturation of oocytes, and to induce ovulation process via binding to epidermal growth factor receptor (EGFR). However, little is known about the distribution and expression of EGF and EGFR in cattle ovary especially during oestrous cycle. In this study, the localization and expression rule of EGF and EGFR in cattle ovaries of follicular phase and luteal phase at different time points in oestrous cycle were investigated by using IHC and real-time qPCR. The results showed that EGF and EGFR in cattle ovary were mainly expressed in granulosa cells, cumulus cells, oocytes, zona pellucida, follicular fluid and theca folliculi externa of follicles. The protein and mRNA expression of EGF/EGFR in follicles changed regularly with the follicular growth wave both in follicular and in luteal phase ovaries. In follicular phase ovaries, the protein expression of EGF and EGFR was higher in antral follicles than that of those in other follicles during follicular growth stage, and the mRNA expression of EGFR was also increased in stage of dominant follicle selection. However, in luteal phase ovaries, the growth of follicles was impeded during corpus luteum development under the action of progesterone secreted by granular lutein cell. The mRNA and protein expressions of EGF and EGFR in ovarian follicles during oestrous cycle indicate that they play a role in promoting follicular development in follicular growth waves and mediating the selection process of dominant follicles. 相似文献
2.
AIM:To investigate the relationship of microRNA-7 (miRNA-7) over-expression and epidermal growth factor receptor (EGFR)/phosphatidylinositol kinase-3 (PI3K)/protein kinase B (PKB, also called Akt) pathway in human nasopharyngeal carcinoma 5-8F cells. METHODS:The 5-8F cells were transfected with miRNA-7 mimics (carrying by Lipofectamine 2000). The expression of miRNA-7 was detected by real-time PCR. The cell proliferation was analyzed by CCK-8 assay. The cell colony-forming capability was determined by cell colony formation test. The expression of EGFR/PI3K/Akt at mRNA and protein levels was examined by real-time PCR and Western blotting. RESULTS:The expression level of miRNA-7 was significantly increased in 5-8F cells compared with negative control (NC) group and control group (P<0.01). The proliferation of NPC 5-8F cells was decreased extremely after tansfected with the miRNA-7 mimics (P<0.01), so did the result of the cell colony-formation test. The expression of EGFR/PI3K/Akt at mRNA and protein levels was significantly down-regulated compared with NC group and control group (P<0.01). CONCLUSION: Over-expression of miRNA-7 significantly inhibits the proliferation and colony-forming ability of nasopharyngeal carcinoma 5-8F cells by down-regulation of EGFR/PI3K/Akt pathway. 相似文献
3.
为探讨氟对不同日龄雄性Wistar大鼠睾丸组织中表皮生长因子（EGF）及其受体（EGFR）表达的影响,选用40日龄雄性Wistar大鼠200只,随机分为2组分别饮用含150mg/L氟化钠的去离子水和去离子水,并于50,80,100,120日龄时处死大鼠,对睾丸组织中EGF及其EGFR的表达情况进行分析。结果表明,染氟组50日龄时睾丸组织间质细胞、精原细胞和生精细胞中EGF的表达量极显著下降（P〈0.01）,精子细胞和管腔脱落物中EGF的表达量降低不明显（P〉0.05）;80,100,120日龄时虽有下降趋势,但无统计学意义（P〉0.05）。而染氟组睾丸组织中EGFR的表达量在50,80,100日龄时均降低,但50,80日龄睾丸组织精子细胞和100日龄睾丸组织曲细精管管腔脱落物中EGFR的表达量极显著下降（P〈0.01）,50日龄时生精细胞中EGFR的表达量显著降低（P〈0.05）;而120日龄时睾丸组织中EGFR的表达量均增高,且管腔脱落物中极显著增高（P〈0.01）。证明氟可降低雄性Wist-ar大鼠性成熟时EGF的表达量以影响精子的生长发育,长期抑制EGF的表达使EGFR的表达增高影响生殖功能。 相似文献
4.
AIM: To investigate the effects of microRNA(miRNA)-126 on the proliferation, migration and invasion of human lung cancer cell lines, and to explore its mechanism. METHODS: The A549 cells were transfected with miRNA-126 agomir by Lipofectamine 2000. The expression of miRNA-126 was detected by real-time PCR. The cell activity was detected by MTT assay. The number of viable A549 cells was counted by the method of Trypan blue exclusion. The cell colony-forming capability was determined by cell colony formation test. The cell migration and invasion abilities were assayed by wound healing and Transwell methods, respectively. The protein levels of p-EGFR, EGFR, p-AKT, AKT, p-mTOR and mTOR were determined by Western blot. RESULTS: The expression level of miRNA-126 was significantly increased in the A549 cells compared with negative control(NC) group and control group(P<0.01). The proliferation of A549 cells was decreased extremely after transfected with the miRNA-126 agomir(P<0.01), so did the result of the cell colony-formation test. The migration and invasion abilities of the lung cancer cells were also significantly inhibited. The protein levels of p-EGFR, p-AKT and p-mTOR were significantly down-regulated compared with NC group and control group(P<0.01). CONCLUSION: Over-expression of miRNA-126 significantly inhibits the proliferation, migration and invasion ability of human lung cancer A549 cells by down-regulation of EGFR/AKT/mTOR pathway. 相似文献
5.
K. Shiomitsu C. L. Johnson D. E. Malarkey A. F. Pruitt D. E. Thrall 《Veterinary and comparative oncology》2009,7(2):106-114
Epidermal growth factor (EGF) and vascular endothelial growth factor (VEGF) signalling pathways play a role in carcinogenesis. Inhibition of EGF receptor (EGFR) and of VEGF is effective in increasing the radiation responsiveness of neoplastic cells both in vitro and in human trials. In this study, immunohistochemical evaluation was employed to determine and characterize the potential protein expression levels and patterns of EGFR and VEGF in a variety of canine malignant epithelial nasal tumours. Of 24 malignant canine nasal tumours, 13 (54.2%) were positive for EGFR staining and 22 (91.7%) were positive for VEGF staining. The intensity and percentage of immunohistochemically positive neoplastic cells for EGFR varied. These findings indicate that EGFR and VEGF proteins were present in some malignant epithelial nasal tumours in the dogs, and therefore, it may be beneficial to treat canine patients with tumours that overexpress EGFR and VEGF with specific inhibitors in conjunction with radiation. 相似文献
6.
Immunohistochemical expression of Epidermal Growth Factor Receptor (EGFR) in canine mammary tissues 总被引：2，自引：0，他引：2
Epidermal Growth Factor Receptor (EGFR) has been extensively studied in human breast cancer; however, systematic studies of EGFR protein expression in canine mammary gland tumours are lacking. Therefore, we evaluated its immunohistochemical expression in a series of 136 canine mammary tumours and representative areas of adjacent normal and hyperplastic mammary tissue and investigated a possible correlation between EGFR overexpression and several clinicopathological parameters and survival. In normal and hyperplastic canine mammary glands, EGFR expression was consistently observed in myoepithelial cells, with luminal cells usually negative. In tumour tissues, EGFR overexpression was found in 9 benign (19.6%) and 38 malignant (42.2%) lesions, with EGFR positivity significantly related with malignancy. Besides animal age and tumour size, there were no significant associations between other clinicopathological parameters and EGFR overexpression. On survival analysis, tumours with EGFR overexpression showed a reduced disease-free and overall survival; however these associations failed to reach statistically significant levels. 相似文献
7.
Li M Liang CG Xiong B Xu BZ Lin SL Hou Y Chen DY Schatten H Sun QY 《Domestic animal endocrinology》2008,34(4):360-371
Previous studies have shown that epidermal growth factor (EGF) has the ability to promote in vitro cultured porcine oocyte maturation. However, little is known about the detailed downstream events in EGF-induced meiotic resumption. We designed this study to determine the relationship of EGF, EGFR, phosphatidylinositol 3-kinase (PI3-kinase), MAPK, and germinal vesicle breakdown (GVBD) during oocyte maturation. Our results showed that GVBD in cumulus-enclosed oocytes (CEOs) but not in denuded oocytes (DOs) was induced by EGF in a dose-dependent manner, which indicated that cumulus cells but not oocyte itself were the main target for EGF-induced meiotic resumption. Furthermore, we found that MAPK in cumulus cells rather than in oocyte was activated immediately after EGF administration. To explore whether EGF exerts its functions through MAPK pathway, the activities of EGF receptor (EGFR) and MAPK were inhibited by employing AG1478 and U0126, respectively. Inhibition of MAPK blocked EGF-induced GVBD, whereas inhibition of EGFR prevented MAPK activation. Both AG1478 and U0126 could lead to the failure of EGF-induced GVBD singly. Notably, we found that LY294002, a specific inhibitor of PI3-kinase, effectively inhibited EGF-induced MAPK activation as well as subsequent oocyte meiotic resumption and this inhibition could not be reversed by adding additional EGF. Thus, PI3-kinase-induced MAPK activation in cumulus cells mediated EGF-induced meiotic resumption in porcine CEOs. Together, this study provides evidences demonstrating a linear relationship of EGF/EGFR, PI3-kinase, MAPK and GVBD and presents a relatively definitive mechanism of EGF-induced meiotic resumption of porcine oocyte. 相似文献
8.
目的：研究表皮生长因子受体(EGFR)在妊娠滋养细胞疾病的表达及其临床意义。方法：采用免疫组化方法，检测石蜡包埋的l05例妊娠滋养细胞疾病和20例正常早孕绒毛组织EGFR蛋白表达水平。结果：EGFR蛋白在妊娠滋养细胞疾病和正常早孕绒毛中均有不同程度的表达，在合体滋养层中，妊娠滋养细胞疾病和正常早孕绒毛组织均强烈表达EGFR蛋白，它们之间的表达差异无显著性。在细胞滋养层，正常早孕绒毛EGFR蛋白表达显著高于葡萄胎(P＜0．01)，葡萄胎EGFR蛋白表达显著高于侵蚀性葡萄胎和绒癌(P＜0．01)，EGFR蛋白表达在侵蚀性葡萄胎和绒癌之间差异无显著性(P＞0．05)。EGFR蛋白表达水平与滋养细胞肿瘤临床指标无关。结论：EGFR表达降低反映了在妊娠滋养细胞疾病发生发展过程中EGFR起重要作用。 相似文献
9.
仿刺参EGFR基因的克隆与表达分析 总被引：1，自引：1，他引：0
表皮生长因子受体(EGFR)是多种细胞因子的受体,在细胞增殖、迁移及分化中具有重要的作用。应用RACE法首次从仿刺参体腔细胞中克隆出EGFR基因的全长cDNA序列。该cDNA全长3 826 bp,包括821 bp的5’-UTR,281 bp的3’-UTR,开放阅读框2 724 bp,编码907个氨基酸。推导的氨基酸序列55-184aa和365-487aa符合EGFR基因所具有的L1和L2受体结构域,在203-344aa和503-823aa含有EGFR家族特征区域CR1和CR2半胱氨酸富集区,并同为跨膜糖蛋白,在结构上具有一致性。经BlastP与GenBank已知物种氨基酸序列进行同源性比对,仿刺参EGFR基因氨基酸序列与果蝇EGFR相似性为49%,同源性为34%,与斑马鱼EGFR相似性为47%,同源性为34%,与淡水椎实螺EGFR相似性为49%,同源性为31%。据此推断,仿刺参EGFR基因属于EGFR家族成员。利用Real-time PCR技术检测了该基因在仿刺参各组织中的表达,结果显示在肠、呼吸树、表皮、体腔细胞、纵肌中EGFR均有表达,且体腔细胞和表皮表达量较高。结果表明,该基因可能在仿刺参组织发育和再生过程中起到重要的调控作用。 相似文献
10.
LIN Xiao-mei MO Juan-mei ZOU Min ZENG Ai-ping YU Qi-tao ZHOU Shao-zhang SONG Xiang-qun 《园艺学报》2012,28(6):1135-1139
AIM: To detect the frequency of EML4-ALK fusion gene in non-small-cell lung cancer (NSCLC) patients who had epidermal growth factor receptor (EGFR) mutation, and to analyze the relationship between EML4-ALK fusion gene and clinical features. METHODS: One hundred and two Chinese patients with NSCLC were selected on the basis of one or more of the following characteristics: female, never/light smoking history and adenocarcinoma histology. The EML4-ALK fusion gene was identified by single-tube multiplex RT-PCR. In EML4-ALK-positive samples, exon 18 to 21 EGFR mutations and exon 1 and 2 KRAS (Kirsten rat sarcoma) mutations were detected by DNA direct sequencing after PCR amplification. RESULTS: Eight specimens (7.8%) were identified with EML4-ALK fusion genes from 102 NSCLC tissues. Of all positive cases, 7 were variant 1 (V1) and 1 was variant 2 (V2). In 8 EML4-ALK-positive samples, exon 18 to 21 EGFR and exon 1 and 2 KRAS were wild-types. Among 8 EML4-ALK-positive cases, 5 cases (5/8, 62.5%) were younger than the mean age. Six cases (6/8, 75%) were female and 7 cases (7/8, 87.5%) were non-smokers. Five cases (5/8, 62.5%) had adenocarcinoma histology. CONCLUSION: EML4-ALK fusion gene defines a new molecular subset of NSCLC with distinct characteristics. The EML4-ALK fusion gene is mutually exclusive to EGFR and KRAS mutations. 相似文献