BACKGROUND Less than 0.5%of intravenously injected drugs reach tumors,contributing to side effects.To limit damage to healthy cells,various delivery vectors have been formulated;yet,previously developed vectors suffer...BACKGROUND Less than 0.5%of intravenously injected drugs reach tumors,contributing to side effects.To limit damage to healthy cells,various delivery vectors have been formulated;yet,previously developed vectors suffer from poor penetration into solid tumors.This issue was resolved by the discovery of HN-1 peptide isolated via biopanning a phage-display library.HN-1 targets human head and neck squamous cell carcinoma(HNSCC)(breast,thyroid;potentially lung,cervix,uterine,colon cancer),translocates across the cell membrane,and efficiently infiltrates solid tumors.HN-1 peptide has been conjugated to various anticancer drugs and imaging agents though the identity of its receptor remained enigmatic.AIM To decipher the clues that pointed to retinoblastoma(Rb)-regulated discoidindomain receptor 1 as the putative receptor for HN-1 is described.METHODS HN-1 peptide was synthesized and purified using reverse-phase highperformance liquid chromatography and gel electrophoresis.The predicted mass was confirmed by mass spectroscopy.To image the 3-dimensional structure of HN-1 peptide,PyMOL was used.Molecular modeling was also performed with PEP-FOLD3 software via RPBS bioinformatics web portal(INSERM,France).The immunohistochemistry results of discoidin domain receptor 1(DDR1)protein were obtained from the publicly accessible database in the Human Protein Atlas portal,which contained the images of immunohistochemically labeled human cancers and the corresponding normal tissues.RESULTS The clues that led to DDR1 involved in metastasis as the putative receptor mediating HN-1 endocytosis are the following:(1)HN-1 is internalized in phosphate-buffered saline and its uptake is competitively inhibited;(2)HN-1(TSPLNIHNGQKL)exhibits similarity with a stretch of amino acids in alpha5 beta3 integrin(KLLITIHDRKEF).Aside from two identical residues(Ile-His)in the middle,the overall distribution of polar and nonpolar residues throughout the sequences is nearly identical.As HN-1 sequence lacks the Arg-Gly-Asp motif recognized by integrins,HN-1 may interact with an"integrin-like"molecule.The tertiary structure of both peptides showed similarity at the 3-dimensional level;(3)HN-1 is internalized by attached cells but not by suspended cells.As culture plates are typically coated with collagen,collagen-binding receptor(expressed by adherent but not suspended cells)may represent the receptor for HN-1;(4)DDR1 is highly expressed in head and neck cancer(or breast cancer)targeted by HN-1;(5)Upon activation by collagen,DDR1 becomes internalized and compartmentalized in endosomes consistent with the determination of’energy-dependent clathrin-mediated endocytosis’as the HN-1 entry route and the identification of HN-1 entrapped vesicles as endosomes;and(6)DDR1 is essential for the development of mammary glands consistent with the common embryonic lineage rationale used to identify breast cancer as an additional target of HN-1.In summary,collagenactivated tyrosine kinase receptor DDR1 overexpressed in HNSCC assumes a critical role in metastasis.Further studies are warranted to assess HN-1 peptide’s interaction with DDR1 and the therapeutic potential of treating metastatic cancer.Additionally,advances in delivery(conformation,endocytic mechanism,repertoire of targeted cancers of HN-1 peptide),tracking(HN-1 conjugated imaging agents),and activity(HN-1 conjugated therapeutic agents)are described.CONCLUSION The discovery of DDR1 as HN-1 peptide’s putative receptor represents a significant advance as it enables identification of metastatic cancers or clinical application of previously developed therapeutics to block metastasis.展开更多
With the support of the National Natural Science Foundation of China and the Ministry of Science and Technology of China,the research teams led by Prof.Gao Hua(高华)from Tongji University,and Prof.Filippo Giancotti at...With the support of the National Natural Science Foundation of China and the Ministry of Science and Technology of China,the research teams led by Prof.Gao Hua(高华)from Tongji University,and Prof.Filippo Giancotti at Memorial Sloan Kettering Cancer Center,reported recently on the mechanism of multiorgan site metastatic creactivation,which was published in Cell(2016,166:47—62).展开更多
目的探究盘状结构域受体1(discoidin domain receptors,DDR1)在慢性结肠炎小鼠肠道炎症及肠纤维化中的功能。方法针对DDR1基因exon4设计并合成gRNA序列,与编码Cas9的mRNA混合显微注射入C57BL/6小鼠受精卵内,构建DDR1基因突变小鼠。选择F...目的探究盘状结构域受体1(discoidin domain receptors,DDR1)在慢性结肠炎小鼠肠道炎症及肠纤维化中的功能。方法针对DDR1基因exon4设计并合成gRNA序列,与编码Cas9的mRNA混合显微注射入C57BL/6小鼠受精卵内,构建DDR1基因突变小鼠。选择F4代基因敲除纯合子小鼠(DDR1^(-/-))和野生型C57BL/6小鼠,通过葡聚糖硫酸钠(DSS)诱导慢性结肠炎模型。比较两组小鼠疾病活动指数(DAI)、体质量、结肠长度及组织病理学变化。ELISA法检测外周血细胞因子的含量,Western blot法检测小鼠结肠纤维化相关蛋白表达。结果PCR法检测结果显示利用CRISPR/Cas9技术成功构建DDR1^(-/-)小鼠;循环饮用DSS后,与野生型小鼠相比,DDR1^(-/-)小鼠体质量下降减缓,DAI评分及肠组织病理学评分降低,结肠短缩减轻(5.81±0.11 cm vs 5.19±0.05 cm,P<0.05);血清IL-1β、TNF-α及TGF-β水平下调(P<0.01);Masson染色胶原容积评分显示肠纤维化减轻(DSS-WT vs DSS-DDR1,41.43±0.08 cm vs 21.37±0.07 cm,P<0.01);肠组织TGF-β、α-SMA和COL1A1的蛋白表达下降。结论DDR1参与慢性结肠炎的发生,敲除DDR1基因可减轻慢性结肠炎肠道炎症及纤维化的症状和疾病进程。展开更多
目的构建盘状结构域受体1(DDR1)基因的慢病毒载体,建立稳定过表达DDR1的人胃腺癌BGC823细胞系。方法实时荧光定量PCR扩增DDR1目的基因,双酶切目的基因并插入LV5载体,构建LV5-DDR1慢病毒表达载体;随后转入人胚肾细胞293FT中进行慢病毒包...目的构建盘状结构域受体1(DDR1)基因的慢病毒载体,建立稳定过表达DDR1的人胃腺癌BGC823细胞系。方法实时荧光定量PCR扩增DDR1目的基因,双酶切目的基因并插入LV5载体,构建LV5-DDR1慢病毒表达载体;随后转入人胚肾细胞293FT中进行慢病毒包装,用获得的慢病毒毒液感染人胃腺癌BGC823细胞系并通过嘌呤霉素筛选阳性表达细胞;根据转染情况,将细胞分为BGC823组(空白BGC823细胞)、BGC-NC组(转染空载慢病毒LV5的BGC823细胞)、BGC-DDR1组(转染过表达LV5-DDR1的BGC823细胞),分别用实时荧光定量PCR和蛋白免疫印迹法分析DDR1 m RNA和蛋白的表达。结果经限制性内切酶鉴定及测序分析,成功构建了LV5-DDR1慢病毒表达载体并进行慢病毒包装。实时荧光定量PCR和蛋白免疫印迹法检测结果显示,与BGC-NC组比较,转染LV5-DDR1慢病毒表达载体组的BGC823细胞DDR1表达水平明显升高(P<0.01)。结论成功构建了DDR1慢病毒表达载体及DDR1稳定过表达的BGC823细胞系。展开更多
文摘BACKGROUND Less than 0.5%of intravenously injected drugs reach tumors,contributing to side effects.To limit damage to healthy cells,various delivery vectors have been formulated;yet,previously developed vectors suffer from poor penetration into solid tumors.This issue was resolved by the discovery of HN-1 peptide isolated via biopanning a phage-display library.HN-1 targets human head and neck squamous cell carcinoma(HNSCC)(breast,thyroid;potentially lung,cervix,uterine,colon cancer),translocates across the cell membrane,and efficiently infiltrates solid tumors.HN-1 peptide has been conjugated to various anticancer drugs and imaging agents though the identity of its receptor remained enigmatic.AIM To decipher the clues that pointed to retinoblastoma(Rb)-regulated discoidindomain receptor 1 as the putative receptor for HN-1 is described.METHODS HN-1 peptide was synthesized and purified using reverse-phase highperformance liquid chromatography and gel electrophoresis.The predicted mass was confirmed by mass spectroscopy.To image the 3-dimensional structure of HN-1 peptide,PyMOL was used.Molecular modeling was also performed with PEP-FOLD3 software via RPBS bioinformatics web portal(INSERM,France).The immunohistochemistry results of discoidin domain receptor 1(DDR1)protein were obtained from the publicly accessible database in the Human Protein Atlas portal,which contained the images of immunohistochemically labeled human cancers and the corresponding normal tissues.RESULTS The clues that led to DDR1 involved in metastasis as the putative receptor mediating HN-1 endocytosis are the following:(1)HN-1 is internalized in phosphate-buffered saline and its uptake is competitively inhibited;(2)HN-1(TSPLNIHNGQKL)exhibits similarity with a stretch of amino acids in alpha5 beta3 integrin(KLLITIHDRKEF).Aside from two identical residues(Ile-His)in the middle,the overall distribution of polar and nonpolar residues throughout the sequences is nearly identical.As HN-1 sequence lacks the Arg-Gly-Asp motif recognized by integrins,HN-1 may interact with an"integrin-like"molecule.The tertiary structure of both peptides showed similarity at the 3-dimensional level;(3)HN-1 is internalized by attached cells but not by suspended cells.As culture plates are typically coated with collagen,collagen-binding receptor(expressed by adherent but not suspended cells)may represent the receptor for HN-1;(4)DDR1 is highly expressed in head and neck cancer(or breast cancer)targeted by HN-1;(5)Upon activation by collagen,DDR1 becomes internalized and compartmentalized in endosomes consistent with the determination of’energy-dependent clathrin-mediated endocytosis’as the HN-1 entry route and the identification of HN-1 entrapped vesicles as endosomes;and(6)DDR1 is essential for the development of mammary glands consistent with the common embryonic lineage rationale used to identify breast cancer as an additional target of HN-1.In summary,collagenactivated tyrosine kinase receptor DDR1 overexpressed in HNSCC assumes a critical role in metastasis.Further studies are warranted to assess HN-1 peptide’s interaction with DDR1 and the therapeutic potential of treating metastatic cancer.Additionally,advances in delivery(conformation,endocytic mechanism,repertoire of targeted cancers of HN-1 peptide),tracking(HN-1 conjugated imaging agents),and activity(HN-1 conjugated therapeutic agents)are described.CONCLUSION The discovery of DDR1 as HN-1 peptide’s putative receptor represents a significant advance as it enables identification of metastatic cancers or clinical application of previously developed therapeutics to block metastasis.
文摘With the support of the National Natural Science Foundation of China and the Ministry of Science and Technology of China,the research teams led by Prof.Gao Hua(高华)from Tongji University,and Prof.Filippo Giancotti at Memorial Sloan Kettering Cancer Center,reported recently on the mechanism of multiorgan site metastatic creactivation,which was published in Cell(2016,166:47—62).
文摘目的探究盘状结构域受体1(discoidin domain receptors,DDR1)在慢性结肠炎小鼠肠道炎症及肠纤维化中的功能。方法针对DDR1基因exon4设计并合成gRNA序列,与编码Cas9的mRNA混合显微注射入C57BL/6小鼠受精卵内,构建DDR1基因突变小鼠。选择F4代基因敲除纯合子小鼠(DDR1^(-/-))和野生型C57BL/6小鼠,通过葡聚糖硫酸钠(DSS)诱导慢性结肠炎模型。比较两组小鼠疾病活动指数(DAI)、体质量、结肠长度及组织病理学变化。ELISA法检测外周血细胞因子的含量,Western blot法检测小鼠结肠纤维化相关蛋白表达。结果PCR法检测结果显示利用CRISPR/Cas9技术成功构建DDR1^(-/-)小鼠;循环饮用DSS后,与野生型小鼠相比,DDR1^(-/-)小鼠体质量下降减缓,DAI评分及肠组织病理学评分降低,结肠短缩减轻(5.81±0.11 cm vs 5.19±0.05 cm,P<0.05);血清IL-1β、TNF-α及TGF-β水平下调(P<0.01);Masson染色胶原容积评分显示肠纤维化减轻(DSS-WT vs DSS-DDR1,41.43±0.08 cm vs 21.37±0.07 cm,P<0.01);肠组织TGF-β、α-SMA和COL1A1的蛋白表达下降。结论DDR1参与慢性结肠炎的发生,敲除DDR1基因可减轻慢性结肠炎肠道炎症及纤维化的症状和疾病进程。
文摘目的构建盘状结构域受体1(DDR1)基因的慢病毒载体,建立稳定过表达DDR1的人胃腺癌BGC823细胞系。方法实时荧光定量PCR扩增DDR1目的基因,双酶切目的基因并插入LV5载体,构建LV5-DDR1慢病毒表达载体;随后转入人胚肾细胞293FT中进行慢病毒包装,用获得的慢病毒毒液感染人胃腺癌BGC823细胞系并通过嘌呤霉素筛选阳性表达细胞;根据转染情况,将细胞分为BGC823组(空白BGC823细胞)、BGC-NC组(转染空载慢病毒LV5的BGC823细胞)、BGC-DDR1组(转染过表达LV5-DDR1的BGC823细胞),分别用实时荧光定量PCR和蛋白免疫印迹法分析DDR1 m RNA和蛋白的表达。结果经限制性内切酶鉴定及测序分析,成功构建了LV5-DDR1慢病毒表达载体并进行慢病毒包装。实时荧光定量PCR和蛋白免疫印迹法检测结果显示,与BGC-NC组比较,转染LV5-DDR1慢病毒表达载体组的BGC823细胞DDR1表达水平明显升高(P<0.01)。结论成功构建了DDR1慢病毒表达载体及DDR1稳定过表达的BGC823细胞系。
